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BEGIN:VEVENT
SUMMARY:$^8$He SPECTROSCOPY IN STOPPED PION ABSORPTION REACTION
DTSTART;VALUE=DATE-TIME:20220712T101000Z
DTEND;VALUE=DATE-TIME:20220712T103000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-229@events.sinp.msu.ru
DESCRIPTION:Speakers: Tatiana Leonova ()\nLevel structure of heavy helium
isotope $^8$He is studied in the reactions of stopped pion absorption $^9$
Be($\\pi^-\,p$)X\, $^{10}$B($\\pi^-\,pp$)X\, $^{11}$B($\\pi^-\,pd$)X\, $^{
12}$C($\\pi^-\,p^3$Нe)X\, $^{14}$C($\\pi^-\,d^4$Нe)X\, $^{14}$C($\\pi^-\
,t^3$Нe)X. The experiment was carried out at the LANL with a two-arm semi
conductor spectrometer. The ground and excited states have been observed
. The assumption that the excited state E$_x \\approx $ 3 MeV is a sof
t dipole mode is made. The states E$_x \\approx $ 9.3 MeV\, 11.5 MeV\, 12.
2 MeV have been observed for the first time. Parameters of excited state
s have been compared with data of other experimental and theoretical works
.\n\nhttps://events.sinp.msu.ru/event/8/contributions/229/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/229/
END:VEVENT
BEGIN:VEVENT
SUMMARY:POSSIBLE ROTATIONAL STRUCTURE OF $^{13}$C LOW-LYING EXCITED STATES
DTSTART;VALUE=DATE-TIME:20220712T091000Z
DTEND;VALUE=DATE-TIME:20220712T093000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-274@events.sinp.msu.ru
DESCRIPTION:Speakers: Andrey Danilov (NRC Kurchatov Institute)\n$^{13}$C i
s a good example of a “normal” nucleus that is well described in the f
ramework of the shell model. Its level scheme is reliably determined up to
excitation energies ~ 10 MeV. \nHowever\, some open questions remain rega
rding the structure of low-lying $^{13}$C states. This leads to increased
attention to $^{13}$C so far.\nIn [1] a hypothesis was put forward about a
new type of symmetry in the $^{13}$C structure - D’$_{3h}$ symmetry. Ba
sed on this symmetry within the framework of the algebraic cluster model [
1] a rotational nature was predicted for low-lying excited states of $^{13
}$C and almost all low-lying $^{13}$C states were distributed among 6 rota
tional bands. Thus\, a critical analysis of the available data is required
to answer the question about the nature of low-lying excited states of $^
{13}$C.\nWe propose to check the possibility of the existence of these rot
ational bands based on Modified diffraction model (MDM) analysis. The g.s.
-based rotational band proposed in the framework of the algebraic cluster
model may exist\, since MDM analysis showed that all states of this band h
ave normal\, nonincreased root mean square radii. The second rotational ba
nd predicted in the framework of the algebraic cluster model\, the band ba
sed on the 3.09 MeV state\, is very interesting and promising\, since its
first state of this band is the state with a halo. And the question arises
about the nature of other states of this band? It is quite natural that t
he states of one band should have similar features. Is the halo structure
preserved for the other members of this band? It should also be noted that
all other members of this band are unbound\, while 3.09 MeV is bound. Ind
eed\, a preliminary MDM analysis of the existing experimental data on the
scattering of light particles showed that the elder members of this band h
ave increased root mean square radius. This result speaks in favor of the
possibility of the existence of this rotational band and\, possibly\, of
the halo–like structure of its elder members. The band predicted in the
framework of the algebraic cluster model\, which contains the 9.90 MeV sta
te\, most likely does not exist\, since we showed within MDM that the memb
ers of this assumed band have different radii. 8.86 MeV has an increased r
adius\, the rest of the states have a non-increased radius. Thus\, some of
the predicted rotational bands may actually exist. It should be mentioned
that negation of at least one rotational band predicted within the D'$_{3
h}$ symmetry raises doubts on the applicability of this symmetry to $^{13}
$C.\n\n1. R. Bijker\, Phys. Rev. Lett. 122\, 162501 (2019).\n\nhttps://eve
nts.sinp.msu.ru/event/8/contributions/274/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/274/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analysis of M1 excitations in $^{28}$Si using inelastic proton sca
ttering
DTSTART;VALUE=DATE-TIME:20220712T120000Z
DTEND;VALUE=DATE-TIME:20220712T122000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-454@events.sinp.msu.ru
DESCRIPTION:Speakers: Mikhail Onegin (NRC "Kurchatov institute" - PNPI)\nI
sovector and isoscalar spin-flip excitations in even-even sd-shell nuclei
excited by inelastic proton scattering were considered in [1]. Recently *M
*1 excitations in sd-shell were also analyzed in [2]. In [2] only stronges
t excitations of $^{28}$Si were discussed. Shell model predicts for $^{28}
$Si a few of 1$^+$ states with excitation energy lower than 20 MeV. Nearly
all of these states can be identified with experimentally observed levels
excited in (p\,p’) and (e\,e’) reactions. Here we analyze the spectru
m of 1$^+$ states in $^{28}$Si excited in (p\,p’) reaction in comparison
with theoretical spectroscopic predictions. The calculations were carried
out in the sd model space with the USDA Hamiltonian [3] using the code Nu
ShellX [4].\nThe M1 excitations in light nuclei are mainly determined by t
he spin transition density. Current transition density play only minor imp
ortance in the observed B(*M*1) value. The B(*M*1) value can be extracted
from the (e\,e’) scattering experiments. On the other hand only spin tra
nsition density determine the forward cross section of (p\,p’) reaction
with the excitation of *M*1 states. We analyze forward cross sections of (
p\,p’) reaction with excitation of 1$^+$ levels in $^{28}$Si and determi
ne the possible impact of current density in the B(*M*1) value. \nIn the e
xcitation of *M*1 states with protons both *T*=1 and *T*=0 states are exci
ted and only *T*=1 states can be excited in (e\,e’). The theoretically p
redicted states can be identified with the observed 1$^+$ levels according
to their excitation energy but the strength of the excitations can consid
erably differ from the theoretical prediction. The possible explanation of
this difference may be the isospin mixture. \n\n1. G.M. Crawley\, C. Djal
ali\, N. Marty et al\, Phys. Rev. C 39\, 311 (1989).\n2. H. Matsubara\, A.
Tamii\, H. Nakada et al\, Phys. Rev. Let. 115\, 102501 (2015).\n3. B. A.
Brown and W.A. Richter\, Phys. Rev. C 74\, 034315 (2006).\n4. B. A. Brown
and W. D. M. Rae\, The Shell-Model Code NuShellX. Nuclear Data Sheets 120\
, 115 (2014).\n\nhttps://events.sinp.msu.ru/event/8/contributions/454/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/454/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theoretical study of antihydrogen formation reactions in the three
body e-e+p̅ system via Faddeev-Merkuriev equations in total orbital mom
entum representation
DTSTART;VALUE=DATE-TIME:20220715T070000Z
DTEND;VALUE=DATE-TIME:20220715T072000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-213@events.sinp.msu.ru
DESCRIPTION:Speakers: Vitaly Gradusov (St. Petersburg State University)\nT
heoretical study of antihydrogen formation reactions in the three body e-e
+p̅ system via Faddeev-Merkuriev\nequations in total orbital momentum re
presentation\n\nV.A. Gradusov1\, V.A. Roudnev1\, E.A. Yarevsky1\, S.L. Yak
ovlev1\n1St Petersburg State University\, St Petersburg\, Russia\; \n E-ma
il: v.gradusov@spbu.ru\n \nWe present the results of calculations of low-e
nergy reaction in the three body e-e+p̅ system with the emphasis on the p
rocess of the antihydrogen formation from the ground and excited states of
the positronium. This reaction is important for some of the current antim
atter experiments [1\, 2]. The multi-channel scattering calculations are b
ased on a new highly efficient method of solving the Faddeev-Merkuriev equ
ations in total orbital momentum representation [3]. We discuss the effect
s that originate from the long-range dipole interaction between the excite
d atom and the spectator particle [4\, 5]. Among them are the Gailtis-Damb
urg oscillations in the total and partial cross sections.\n\n\n\n 1. G
. Testera et al. (AEgIS Collab.)\, Hyperfine Interact. 233\, No. 1-3\, 13
(2015).\n 2. P. Pérez et al.\, Hyperfine Interact. 233\, No. 1-3\, 21
(2015).\n 3. V.A. Gradusov et al.\, Commun. Comput. Phys. 30\, No. 1\
, 255 (2021).\n 4. M. Gailitis\, J. Phys. B: Atom. Mol. Phys. 9\, 843
(1976). \n 5. M. Gailitis and R. Damburg\, Sov. Phys. JETP 17\, No. 5\
, 1107 (1963).\n\nhttps://events.sinp.msu.ru/event/8/contributions/213/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/213/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simple model of dissociation based on time-dependent Faddeev equat
ions
DTSTART;VALUE=DATE-TIME:20220715T103000Z
DTEND;VALUE=DATE-TIME:20220715T105000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-212@events.sinp.msu.ru
DESCRIPTION:Speakers: Vladimir Roudnev (St Petersburg State University)\nF
addeev equations play an important role as a backbone of computational and
theoretical models of quantum few-body systems in nuclear\, atomic and mo
lecular physics. Traditionally\, they are used in the context of bound sta
te and scattering calculations in stationary approach. The Faddeev decompo
sition of the operator can also be efficiently used for theoretical and nu
merical modeling of essentially non-stationary processes\, such as dissoci
ation and ionization of molecular ions in the external non-stationary fiel
ds. Here we take a step towards more extensive usage of the Faddeev decomp
osition for non-stationary systems by giving an example of a simple model
of the positive Hydrogen ion dissociation in a short intense laser field.
\nAs is mentioned by Belyaev [1]\, the Faddeev decomposition allows us to
formulate the simplest possible model of interatomic interaction by using
a single two-body state projection of different components of the interac
tion\, which\, unlike the traditional quantum chemistry approach\, gives t
he results that are qualitatively comparable to the exact treatment of the
problem. By including a non-stationary interaction with an external field
we come to a system of non-stationary Faddeev equations that we solve num
erically. We compare the dissociation probability and the kinetic energy r
elease (KER) for the dissociated state obtained in the new and the more tr
aditional time-dependent Schroedinger equation approaches [2]. \n\n1. Vlad
imir B. Belyaev\, Lectures on the Theory of Few-Body Systems\, Springer Ve
rlag (1990).\n2. V. Roudnev and B.D. Esry\, Phys. Rev. A. 71\, 013411 (2
005).\n\nhttps://events.sinp.msu.ru/event/8/contributions/212/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/212/
END:VEVENT
BEGIN:VEVENT
SUMMARY:PECULIARITIES OF THE ENERGY SPECTRUM OF THE 12C NUCLEUS IN
A 3α MODEL
DTSTART;VALUE=DATE-TIME:20220715T132000Z
DTEND;VALUE=DATE-TIME:20220715T134000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-214@events.sinp.msu.ru
DESCRIPTION:Speakers: Ergash Tursunov (Institute of Nuclear Physics\, Uzbe
kistan Academy of Sciences)\nThe aim of present work is to study peculiar
properties of the 12C(0+) and 12C(2+) energy spectrum associated with remo
val of Pauli forbidden states from the 3α functional space. A deep αα-
potential of BFW [1] will be employed which has two Pauli forbidden states
in the S wave and a single forbidden state in the D wave. A variational m
ethod on symmetrized Gaussian basis is employed. For the elimination of th
e 3α Pauli forbidden states we use the same direct orthogonalization meth
od from [2]. As a possible origin of non-analytical behavior of the 12C sp
ectrum\, consequences of the quantum phase transition (QPT) in the 12C nuc
leus will be discussed.\nThe direct orthogonalization method [2] is based
on the separation of the complete Hilbert functional space into two parts.
The first subspace LQ\, which we call allowed subspace\, is defined by th
e kernel of the complete three-body projector P ̂. The rest subspace LP
contains 3α states forbidden by the Pauli principle. After the separation
of the complete Hilbert functional space of 3α states into the LQ and LP
subspaces\, at next step we solve the three-body Schrödinger equation in
LQ.\n\nIn Fig.1 we display the calculated lowest 0+ spectrum of the 12C n
ucleus as a function of ϵ\, the maximal allowed eigen value of the Pauli
projection operator. As can be seen from the figure\, there exist a specia
l eigen value of the projector P ̂\, which play a decisive role for the 0
+ energy spectrum of the 12C nucleus. The corresponding eigen state of P
̂ creates a ground state of 12C in a deep phase\, while from the left sid
e of this point the lowest energy is close to the energy of the Hoyle stat
e. The situation in the 2+ spectrum is similar.\n\n1. B. Buck\, H. Friedri
ch\, and C. Wheatley\, Nucl. Phys.A 275\, 246 (1977).\n2. H. Matsumura\, M
. Orabi\, Y. Suzuki\, and Y. Fujiwara\, Nucl. Phys. A 776\, 1 (2006).\n\nh
ttps://events.sinp.msu.ru/event/8/contributions/214/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/214/
END:VEVENT
BEGIN:VEVENT
SUMMARY:LOCAL MAGIC NUCLEI: PROPERTIES AND STRUCTURE
DTSTART;VALUE=DATE-TIME:20220714T140800Z
DTEND;VALUE=DATE-TIME:20220714T143500Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-585@events.sinp.msu.ru
DESCRIPTION:Speakers: Igor Boboshin (Skobeltsyn Institute of Nuclear Physi
cs\, Lomonosov Moscow State University\, Moscow\, Russia)\nA new kind of a
tomic nuclei\, local magic nuclei (l.m.n.)\, have been discovered recently
[1]. We present in this report a current state of relevant research.\nL.m
.n. have the same observable features as traditional magic nuclei\, i.e. e
levated energies of the first 2+ excitations\, increased nucleon separatio
n energies\, and so on. However\, unlike the traditional magic nuclei\, l.
m.n. do not have magic isotopes or isotones\, and\, in addition\, they man
ifest at non-conventional magic numbers. They are described not by ‘magi
c numbers’ but by ‘miraculous pairs’\, such as (N\, Z) and similar\,
where the underline denotes a number that loses its magicity in another p
air. Examples of observed pairs are (N\, Z) = (32\, 20)\, (40\, 28)\, (56\
, 40)\, (64\, 50)\, (82\, 64) etc. \nL.m.n. arise due to the compact (like
a hole) gaps inside the traditional shells. This conclusion follows from
our studies of the one-nucleon stripping and pick-up reactions. As we supp
ose this shell evolution is due to nucleon-nucleon interactions\, and the
proton-neutron tensor force makes a decisive contribution. On this basis\,
we have constructed the diagrams of the nucleon orbit energies\, which su
ccessfully describe above processes. These diagrams predict new magic numb
ers as well.\nAs a result\, we obtain the two-dimensional (N\, Z) shell sc
heme\, which develops the traditional Goeppert-Mayer – Jensen scheme.\n\
n\n1. Igor Boboshin // Preprint of Skobeltsyn Institute of Nuclear Physics
\, Lomonosov Moscow State University\, http://www.sinp.msu.ru/en/preprint/
25701.\n\nhttps://events.sinp.msu.ru/event/8/contributions/585/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/585/
END:VEVENT
BEGIN:VEVENT
SUMMARY:EXPERIMENTAL INVESTIGATIONS OF THE 9.2\, 15.1\, AND 24.3 keV NUCLE
AR TRANSITIONS IN 227Th AND CONSEQUENCES OF THEIR RESULTS FOR SPIN-PARITY
ASSIGNMENTS TO LOW-LYING STATES OF 227Th
DTSTART;VALUE=DATE-TIME:20220712T145000Z
DTEND;VALUE=DATE-TIME:20220712T151000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-442@events.sinp.msu.ru
DESCRIPTION:Speakers: Anvar Inoyatov (Joint Institute for Nuclear Research
\, Dubna\, NPI ASUzR\, Ulugbek\, Uzbekistan)\nThe 9.2\, 15.1\, and 24.3 ke
V nuclear transitions in 227Th were studied in the --decay of 227Ac by
means of the internal conversion electron spectroscopy (ICES) using the co
mbined electrostatic electron spectrometer [1] and the computer code SOFIE
(see\, e.g.\, Ref. [2]) to clarify the spin-parity assignment of the grou
nd state and the two lowest excited states in 227Th. Results obtained were
published in [3\,4\,5]. \nEnergies of (9244.6±0.8)\, (15098.6±1.0)\, an
d (24343.1±1.1) eV were determined for the 9.2\, 15.1\, and 24.3 keV tran
sitions\, respectively\, as well as the mixed character (M1+E2) for each o
f them with the δ2(E2/M1) values of (0.695±0.248)\, (0.0012±0.0003)\, a
nd (0.0116±0.0004)\, respectively. An agreement within ±0.1 eV was found
among the above transition energy values and those obtained from their in
terlinked relations based on the decay scheme. Using the gamma-ray spectro
scopy\, energy values of (24342.9±1.2)\, (28613.3±1.7)\, and (37860.2±2
.0) eV were obtained for the 24.3\, 28.6\, and 37.8 keV transitions in 227
Th\, respectively. The almost zero difference of (0.2±1.6) eV for the 24.
3 keV transition energies determined by the ICES and gamma-ray methods dem
onstrates a reliability of the transition energy determination in the pres
ent work.\nOur investigation removed the uncertainty in the multipolarity
character of the 15.1 keV transition. Determined [4] nonzero value of δ(E
2/M1) parameter for the 9.2 keV transition questioned the current theoreti
cal interpretation of low-lying levels of 227Th. Our calculations [4] pref
er the 1/2+\, 3/2+\, and 3/2+ sequence instead of the adopted 1/2+\, 5/2+
and 3/2+ one for the 0.0\, 9.2\, and 24.3 keV levels\, respectively. In su
ch a case\, the assignment Iπ=5/2+ for any of these levels is excluded. N
evertheless\, it is necessary to use more precise theoretical approaches t
o prove the proposed interpretation of the current experimental data. New
experimental information on low-energy transitions connecting low-lying le
vels in similar nuclei is desirable as well.\n\n1. Ch. Briançon et al.\,
Nucl. Inst. Meth\, 221 (1984) 547.\n2. A. Inoyatov et al.\, J. Elect. Spec
. Relat. Phenom.\, 160 (2007) 54.\n3. A. Kovalík et al.\, Eur. Phys. J. A
\, 55 (2019) 131.\n4. A. Kovalík et al.\, Phys. Lett. B\, 820 (2021) 1365
93.\n5. A. Kovalík et al.\, Eur. Phys. J. A\, 57 (2021) 285.\n\nhttps://e
vents.sinp.msu.ru/event/8/contributions/442/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/442/
END:VEVENT
BEGIN:VEVENT
SUMMARY:4G model of fitting RMS radius of proton
DTSTART;VALUE=DATE-TIME:20220715T153000Z
DTEND;VALUE=DATE-TIME:20220715T155000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-579@events.sinp.msu.ru
DESCRIPTION:Speakers: Laksminarayana S (Andhra University\, Visakhapatnam-
03\,AP\, INDIA)\nIn our 4G model of final unification\, along with three l
arge atomic gravitational constants pertaining to electromagnetic\, strong
and weak interactions\, we have proposed the existence of a strong nuclea
r charge of magnitude $e_s \\cong 2.9463591e$ and existence of electrowe
ak fermion of rest energy $M_wc^2\\cong 584.725$ GeV. With reference to p
rotons\, pions and weak bosons\, we noticed that\, $\\frac{m_p}{M_w}\\cong
\\frac{\\sqrt{\\left(m_\\pi\\right)^{0} \\left(m_\\pi\\right)^{ \\pm }}}{
\\sqrt{ \\left(m_z\\right)^{0}\\left(m_w\\right)^{\\pm}}}\\cong 0.0016$ an
d this number seems to play a crucial role in understanding nuclear stabil
ity and binding energy. Increasing number of free nucleons\, increasing nu
clear radii and increasing asymmetry about stable mass number play importa
nt role in reducing the nuclear binding energy. Unified binding energy coe
fficient can be expressed with\, $B_0 \\cong \\sqrt{\\left(\\frac{e_s^2}{8
\\pi \\epsilon_0 \\left(\\frac{\\hbar}{m_pc}\\right)}\\right)\\left(\\fra
c{e^2}{8 \\pi \\epsilon_0 \\left(\\frac{\\hbar}{m_pc}\\right)}\\right)}\\c
ong 10.1$ MeV. A four term nuclear binding energy relation for $\\left[\\l
eft(Z \\geq 3\\right) \\textrm{and}\\left(N\\geq Z\\right)\\right]$ can be
expressed as\, $BE\\cong \\left[A-\\left(1+0.0016\\left(\\frac{Z^2+A^2}{2
}\\right)\\right)-A^{\\frac{1}{3}}-\\left(\\frac{\\left(A_s-A\\right)^2}{A
_s}\\right)\\right]\\left(10.1\\right)$ MeV where $A_s\\cong \\left(2Z\\r
ight)+0.0016\\left(2Z\\right)^2\\cong \\left(2Z\\right)+0.0064Z^2$ = Estim
ated mass number close to stability zone. Based on these relations\, we no
ticed a relation for fitting RMS radius of proton as\, $R_p \\cong \\sqrt{
\\frac{4 \\pi \\epsilon_0 \\hbar^3}{e_s^2 m_p^2 c}} \\cong \\sqrt{\\frac{\
\alpha_s}{\\alpha}}\\left(\\frac{\\hbar}{m_p c}\\right)\\cong 0.835$ fm wh
ere $\\alpha_s \\cong 0.1152$ represents the strong coupling constant. It
needs further study.\n\nhttps://events.sinp.msu.ru/event/8/contributions/5
79/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/579/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Role of Quarks in Nuclear Structure
DTSTART;VALUE=DATE-TIME:20220714T145500Z
DTEND;VALUE=DATE-TIME:20220714T151500Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-582@events.sinp.msu.ru
DESCRIPTION:Speakers: Genis Musulmanbekov (JINR)\nWe propose semi-empirica
l quark model of nuclear structure that is based on the quark model of nuc
leon structure\, Strongly Correlated Quark Model (SCQM). Nuclei are constr
ucted due to junctions of SU(3) color fields of quarks of neighbor nucleon
s [1]. According to SCQM\, arrangement of nucleons within nuclei reveals t
he emergence of the face-centered cubic (FCC) symmetry [2]. The model of
nuclear structure becomes isomorphic to the shell model and\, moreover\, c
omposes the features of cluster models. Binding of nucleons in stable nucl
ei are provided by quark loops which form three and four nucleon correlati
ons. On the quark level the nuclear shell closures starting from s-shell c
orrespond to the octahedral symmetry. The closure of a subsequent shells
(p\, d\, f\, ...) leads to rearrangement and disappearance of the previo
us ones\, i.e. to no-core shells. Quark loops leading to four-nucleon cor
relations are responsible for the binding energy enhancement in even-even
nuclei which are formed by virtual alpha-clusters. Two neighbor virtual a
lpha-clusters possess one common nucleon which couples them. The model de
scribes the "magic" numbers without spin-orbital coupling of the shell mo
del. According to the model "halo" nuclei emerge according to quark loops
resulting in three nucleon correlations. The model allows to describe nucl
ear deformation\, predict the boundary on nuclear stability and etc.\n\nRe
ferences\n\n[1] G. Musulmanbekov in Frontiers of Fundamental Physics\, New
York\, Kluwer Acad/Plenum Publ.\, 2001\, p. 109 - 120.\; PEPAN Lett.\, 20
21\, v.18\, N5\, p. 548-558.\n\n[2] G. Musulmanbekov and N.D. Cook\, Phys.
Atom. Nucl. 71\, 1226\n\nhttps://events.sinp.msu.ru/event/8/contributions
/582/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/582/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum-quasiclassical approach for few-body problems in atomic an
d nuclear physics
DTSTART;VALUE=DATE-TIME:20220715T120000Z
DTEND;VALUE=DATE-TIME:20220715T122000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-584@events.sinp.msu.ru
DESCRIPTION:Speakers: Vladimir Melezhik (BLTP JINR)\nWe discuss the effici
ent quantum-quasiclassical method developed by V.S. Melezhik with co-autho
rs [1-4]\, which has been successfully applied to calculate various few-bo
dy processes and has made it possible to resolve a number of topical probl
ems in atomic [1\,3-5]\, mesoatomic [2]\, and nuclear physics [6]. In this
approach\, a few-body quantum problem is reduced to the simultaneous inte
gration of a system of coupled quantum and classical equations: the time-d
ependent Schrödinger equation\, which describes the quantum dynamics of
slow light paricles\, and the classical Hamilton equations\, describing th
e fast variables of heavy particles. \nRecently [5]\, the approach was ext
ended and adapted for quantitative description of pair collisions of light
slow Li atoms with heavy Yb+ ions in the confined geometry of the hybrid
atom-ion trap. On the basis of these calculations\, a new method for symp
athetic cooling of ions in a RF Paul trap was proposed: to use cold buffer
atoms for this purpose in the region of atom-ion confinement-induced reso
nance [5]. \nThis approach also made it possible to perform calculations o
f the breakup cross sections into the low-energy region (up to 10 MeV/nucl
eon)\, inaccessible so far to other methods\, for the 11Be breakup on a he
avy target [6].\nThe developed quantum-quasiclassical method opens new pos
sibilities in the investigation of other hot few-body quantum systems.\n\n
1. V.S. Melezhik and P. Schmelcher\, Phys. Rev. Lett. 84\, 1870 (2000).\n2
. V.S. Melezhik\, Hyperfine Int. 138\, 351 (2001).\n3. V.S. Melezhik\, J.S
. Cohen\, and C.Y. Hu\, Phys. Rev. A69\, 032709 (2004).\n4. V.S. Melezhik
and L.A. Sevastianov\, Lecture Notes in Comp. Sci. 10684\, 449 (2017).\n5.
V.S. Melezhik\, Phys. Rev. A103\, 053109 (2021).\n6. D. Valiolda\, D. Jan
sejtov\, and V.S. Melezhik\, The European Phys. J. A58\, 34 (2022).\n\nht
tps://events.sinp.msu.ru/event/8/contributions/584/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/584/
END:VEVENT
BEGIN:VEVENT
SUMMARY:AB INITIO STUDY OF RADII AND COULOMB SHIFTS OF SIX-NUCLEON ISOBAR
ANALOGUE STATES
DTSTART;VALUE=DATE-TIME:20220715T074000Z
DTEND;VALUE=DATE-TIME:20220715T080000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-231@events.sinp.msu.ru
DESCRIPTION:Speakers: Dmitry Rodkin (VNIIA)\nThe problem of describing the
size parameters (matter\, charge\, neutron radii) of nuclei in an ab init
io approach attracts a wide range of researchers. The size parameters of e
xotic nuclei\, in particular\, the size of halo (neuron or proton)\, have
the greatest physical significance. \nIn the present work\, for these purp
oses\, one of the most reliable and justified ab initio approaches\, No-Co
re Shell Model (NCSM) [1]\, is used. Two different NN-potentials are explo
ited in the calculations\, the first of which was obtained from the chiral
effective field theory [2]\, and the second one – from nucleon scatteri
ng data using the J-matrix inverse scattering method [3]. Both of these po
tentials are universal\, they have been tested in calculations of binding
energies\, spectra\, and other characteristics. The NCSM calculations are
supplemented by the extrapolation procedure for the size parameters propos
ed in Ref. [4]. \nIn this way\, in the current work material\, charge\, an
d neutron radii as well as the size of the neutron halo of 6He isotope are
computed. It is interesting to note that the results of calculations of t
he halo size turned out to be the most stable.\nThe obtained results are i
n a reasonable agreement with the modern experimental data. A comparative
analysis of the results of other theoretical works is given.\n \n1. C. Stu
mpf\, J. Braun\, R. Roth\, Phys. Rev. C 93\, 021301(R) (2016).\n2. A. M. S
hirokov\, I. J. Shin\, Y. Kim\, M. Sosonkina\, P. Maris\, J. P. Vary\, Phy
s. Lett. B 761\, 87 (2016).\n3. A. M. Shirokov\, J. P. Vary\, A. I. Mazur\
, T. A. Weber\, Phys. Lett. B 644\, 33 (2007).\n4. C. Forssen\, et al.\, P
hys. Rev. C 97\, 034328 (2018).\n\nhttps://events.sinp.msu.ru/event/8/cont
ributions/231/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/231/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Fayans energy-density functional. New constraints fro
m the equations of state.
DTSTART;VALUE=DATE-TIME:20220715T101000Z
DTEND;VALUE=DATE-TIME:20220715T103000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-587@events.sinp.msu.ru
DESCRIPTION:Speakers: Ivan Borzov (NIC Kurchatov Institute)\nThe Fayans en
ergy-density functional. \n New constraints from the equat
ions of state. \n I.N. Borzov 1\,2\, S.V. Tolokonnik
ov1\,3 \n1 National Research Centre “Kurchatov Institute”\, Moscow\, R
ussia\n2Bogolubov Laboratory of Theoretical Physics\, Joint Institute of N
uclear Research\, Dubna\, Russia\n3 Moscow Institute of Physics and Techno
logy (National Research University)\, Dolgoprudny\, Russia\n†E-mail: Bor
zov_IN@nrcki.ru\, cc: ibor48@mail.ru\n\nThe equations of state for infinit
e\, symmetric nuclear matter and pure neutron matter are analyzed in terms
of the Fayans energy density functional parameters: a+\,-1\,2\, h+\,-1\,2
. Fitting procedure of the DF3-a functional [1] is redone involving the pr
eviously unused parameter h-2. Additional constraint is implemented from t
he upper bound of the giant dipole resonance energy in 208Pb. A quality of
the previous global fit of the Fayans EDF has been kept for the nuclear d
ensities\, masses of nuclei\, single-particle levels and charge radii. Rec
ently the constraints on symmetry energy and its derivative has been obtai
ned in [6] using the data on nuclear masses\, results of ab initio calcula
tions with N3LO\, ΔRnp values from PREXP-II\, CREX experiments\, as well
as the latest data from the radii of neutron stars and registration of gra
vitational waves. The symmetry energy slope at saturation L(ρ0) calculate
d for different h-2 with the relativistic corrections taken into account (
Fig.1) is compared with the error margines derived from the set of restric
tions [6]. As it can be seen\, for DF3-a\, the EOS is softer than the ones
obtained from the FANDF0 functional [2]\, as well as from APR [3]\, AFDMC
[4]\, N2LO(D2\,E1) and N2LO(D2\,Eτ) [5] (Fig.2).\nSupported by the grant
of Russian Scientific Foundation (RSF 21-12-00061). \nFig.1. The L(ρ) fo
r symmetric nuclear matter. Calculation with the DF3-a functional for var
ious value of parameter h−2 . \nFig. 2. Energy per nucleon for a symmet
rical nuclear mater (SNM) as a function of density. our calculation with t
he FaNDF0[1]\, DF3-a[2] as well as for APR [3]\, AFDMC [4]\, N2LO[5] funct
ionals.\n\n1. S.V. Tolokonnikov\, E.E. Saperstein\, Phys. At. Nucl. 74\, 1
277 (2011).\n2. S.A. Fayans\, JETP Lett. 68\, 169 (1998). \n3. A. Akmal\,
V. R. Pandharipande\, and D. G. Ravenhall\, Phys. Rev. C 58\, 1804 (1998).
\n4. S. Gandolfi\, A. Yu. Illarionov\, K. E. Schmidt\, F. Pederiva\, and S
. Fantoni\, Phys. Rev. C 79\, 054005 (2009).\n5. D. Lonardoni\, I. Tews\,
S. Gandol_\, and J. Carlson\, arXiv:1912.09411 [nucl-th] (2019).\n6. J. La
ttimer in "Nuclear Matter Symmetry Energy From Experiment\, Theory and Obs
ervation"\,S@INT seminar\, Seattle\,2021.\n\nhttps://events.sinp.msu.ru/ev
ent/8/contributions/587/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/587/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SEARCH FOR ALPHA-CONDENSATE EFFECTS IN DISSOSIASION OF RELATIVISTI
C NUCLEI
DTSTART;VALUE=DATE-TIME:20220715T082000Z
DTEND;VALUE=DATE-TIME:20220715T084000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-242@events.sinp.msu.ru
DESCRIPTION:Speakers: Andrei Zaitsev ()\nThe BECQUEREL experiment is aimed
at solving topical problems in nuclear cluster physics [1]. Due to its un
ique sensitivity and spatial resolution the used method of nuclear track e
mulsion (NTE) makes it possible\, to study in a unified approach multiple
final states arising in the dissociation of relativistic nuclei. The focus
is a concept of α-particle Bose-Einstein condensate ($\\alpha$BEC) - the
extremely cold state of several S-wave $\\alpha$-particles near the coupl
ing threshold. The unstable $^8$Be nucleus is described as 2$\\alpha$BEC\,
and the $^{12}$C(0$^+_2$) excitation or Hoyle state (HS) as 3$\\alpha$BE
C. The state $^{16}$O(0$^+_6$) above the 4$\\alpha$ threshold\, considered
as 4$\\alpha$BEC\, can sequentially decay $^{16}$O(0$^+_6$) → $\\alpha$
$^{12}$C(0$^+_2$) or $^{16}$O(0$^+_6$) → 2$^8$Be(0$^+$). \nIn NTE layer
s longitudinally exposed to relativistic nuclei the invariant mass of ense
mbles of He and H fragments can be determined from the emission angles in
the approximation of conservation of initial momentum per nucleon. $^8$Be
and HS decays\, as well as $^9$B → $^8$Be$p$ decays\, are identified in
fragmentation of light nuclei by an upper constraint on the invariant mass
[2]. Photos and videos of characteristic interactions are available on th
e site http://becquerel.jinr.ru/. This approach has been used to identify
$^8$Be and HS and search for more complex states of $\\alpha$BEC in fragme
ntation of medium and heavy nuclei. Recently\, based on the statistics of
dozens of $^8$Be decays\, an enhancement in the probability of detecting $
^8$Be in an event with an increase in the number of relativistic $\\alpha$
-particles in it was found [3]. A preliminary conclusion is drawn that the
contributions from $^9$B and HS decays also increase. The exotically larg
e sizes and lifetimes of $^8$Be and HS suggest the possibility of synthesi
zing $\\alpha$BEC by successively connecting the emerging $\\alpha$-partic
les 2$\\alpha$ → $^8$Be\, $^8$Be$\\alpha$ → $^{12}$C(0$^+_2$)\, $^{12}
$C(0$^+_2$)$\\alpha$ → $^{16}$O(0$^+_6$)\, 2$^8$Be → $^{16}$O(0$^+_6$
) and further with a decreasing probability at each step\, when $\\gamma$-
quanta or recoil particles are emitted. Nowadays\, the main task is to cla
rify the relation between the appearance of $^8$Be and HS and the multipli
city of $\\alpha$-ensembles and to search on this basis for decays of the
$^{16}$O(0$^+_6$) state. In this regard\, the BECQUEREL experiment aims to
measure multiple channels of $^{84}$Kr fragmentation at energies up to 95
0 MeV per nucleon. There are a sufficient number of NTE layers\, the trans
verse scanning of which on a motorized microscope makes it possible to ach
ieve the required statistics. A status of the ongoing research is presente
d.\n\n1. P.I. Zarubin\, Lect. Notes in Phys. 875\, Clusters in Nuclei\, Vo
lume 3. Springer Int. Publ.\, 51 (2013)\; DOI: 10.1007/978-3-319-01077-9_3
\, arXiv: 1309.4881.\n2. D.A. Artemenkov et al.\, Eur. Phys. J. A 56 (202
0) 250\; DOI: 10.1140/epja/s10050-020-00252-3\, arXiv: 2004.10277.\n3. A.
A. Zaitsev et al.\, Phys. Lett. B 820 (2021) 136460\; DOI 10.1016/j.physle
tb.2021.136460\, arXiv: 2102.09541.\n\nhttps://events.sinp.msu.ru/event/8/
contributions/242/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/242/
END:VEVENT
BEGIN:VEVENT
SUMMARY:First experiment at the Super Heavy Element Factory. New data in t
he 243Am + 48Ca reaction.
DTSTART;VALUE=DATE-TIME:20220712T070000Z
DTEND;VALUE=DATE-TIME:20220712T072000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-591@events.sinp.msu.ru
DESCRIPTION:Speakers: Nikita Kovrizhnykh (Joint Institute for Nuclear Rese
arch)\nWe present results of the first experiments aimed at the synthesis
of Mc isotopes in the 243Am+48Ca reaction performed at the new gas-filled
separator DGFRS-2 on-line to the new cyclotron DC280 at the SHE Factory at
JINR. One hundred-ten new decay chains of 288Mc\, four new decay chains o
f 287Mc and ten chains assigned to 289Mc were detected. The α-decay of 26
8Db with an energy of 7.6-8.0 MeV\, half-life of 16(+6 -4) h\, and a branc
h of 55(+20 -15) was registered for the first time\, and a new spontaneous
ly fissioning isotope 264Lr with a half-life of 4.9(+2.1 -1.3) h was ident
ified. Decay chain of the new superheavy isotope 286Mc has been registered
. We firstly observed spontaneous fission of 279Rg. The cross section for
the 243Am(48Ca\,3n)288Mc reaction was measured to be 17.1(+6.3 -4.7) pb\,
which is the largest value for a superheavy nucleus at the Island of Stabi
lity. The cross section of 243Am(48Ca\,5n)286Mc was measured for first tim
e.\n\nhttps://events.sinp.msu.ru/event/8/contributions/591/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/591/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Optimal bounds on the speed of subspace evolution governed by a ti
me-dependent Hamiltonian
DTSTART;VALUE=DATE-TIME:20220715T072000Z
DTEND;VALUE=DATE-TIME:20220715T074000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-252@events.sinp.msu.ru
DESCRIPTION:Speakers: Alexander K. Motovilov (BLTP\, JINR\, Dubna)\nBy a q
uantum speed limit one usually understands an estimate on how fast a quan
tum system can evolve between two distinguishable states. The most known q
uantum speed limit is given in the form of the celebrated Mandelstam-Tamm
inequality that bounds the speed of the evolution of a state in terms of i
ts energy dispersion. In contrast to the basic Mandelstam-Tamm inequality\
, we are concerned not with a single state but with a (possibly infinite-d
imensional) subspace which is subject to the Schroedinger evolution. By us
ing the concept of maximal angle between subspaces we derive optimal bound
s on the speed of such a subspace evolution. Our present study extends the
results obtained in [1\,2] for time-independent Hamiltonians to the case
of subspace evolution governed by a (possibly unbounded) *time-dependent*
Hamiltonian.\n\n\n[1] S.Albeverio and A.K.Motovilov\, *Quantum speed limit
s for time evolution of a system subspace*\, Particles & Nuclei (to appear
)\; arXiv:2011.02778.\n\n[2] S.Albeverio and A.K.Motovilov\, *Optimal boun
ds on the speed of subspace evolution*\, J. Phys. A: Math. Theor. (to appe
ar)\; arXiv:2111.05677.\n\nhttps://events.sinp.msu.ru/event/8/contribution
s/252/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/252/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dynamic three-quasiparticle correlations in the ground state
DTSTART;VALUE=DATE-TIME:20220715T130000Z
DTEND;VALUE=DATE-TIME:20220715T132000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-260@events.sinp.msu.ru
DESCRIPTION:Speakers: Mikhail Shitov (NRC "Kurchatov Institute")\nEarlier\
, three-quasiparticle correlations in the ground state ($GSC_3$) were stud
ied in [1\,2] for static characteristics in the calculations of quadrupole
moments in first excited 2^+ and 3^- states of Sn isotopes. Here we discu
ss $GSC_3$ for transitions with the energy $ω ≠0$ between these excite
d states. Calculations were performed for a large number of Sn isotopes.
It was shown that\, similar to the [1\,2\,3] results\, and to the contrary
to $GSC_2$ of the RPA case\, $GSC_3$ give a considerable contribution t
o the B(E1) values for transitions between first excited $2^+$ and $3^-$
states. However\, there is a specifity for the pairing case: it turned out
that here the $GSC_3$ role is decreased as compared with the static case
[1\,2]\, but nevertheless it is rather noticeable. A comparison with the
similar physical problems within the Quasiparticle-Phonon Model was perfo
rmed.\n\n1. D. Voitenkov\, S. Kamerdzhiev\, S. Krewald\, E.E. Saperstein a
nd S.V. Tolokonnikov\, Phys. Rev. C 85\, 054319 (2012).\n2. С. П. Кам
ерджиев\, Д. А.Войтенков\, Э. Е.Саперштейн\,
С. В.Толоконников\, Письма в ЖЭТФ\, том 108\,
155 (2018).\n3. М. И. Шитов\, Д. А. Войтенков\, С. П
. Камерджиев\, С. В. Толоконников\, Ядерная
физика\, том 85\, 1 (2022).\n\nhttps://events.sinp.msu.ru/event/
8/contributions/260/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/260/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalization of theory of finite fermi-systems for pygmy- and gi
ant multipole resonances
DTSTART;VALUE=DATE-TIME:20220714T120000Z
DTEND;VALUE=DATE-TIME:20220714T122000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-281@events.sinp.msu.ru
DESCRIPTION:Speakers: Sergey Kamerdzhiev (NRC "Kurchatov Institute")\nThe
generalized equation for the main notion of the self-consistent theory of
finite Fermi-systems (TFFS) [1\,2] effective field ( vertex) $\\tilde V$
\, which describes nuclear polarizability\, has been derived for the case
of consistent accounting for phonon coupling (PC) in the energy region of
pygmy-and giant resonances (GDR \, GMR) in magic nuclei [3\,4]:\n \nFigur
e 1. F – effective interaction\, $Γ^r$ – regular part of the full in
teraction amplitude Γ [1]\, circles and wavy lines – phonons. The known
terms are from the first to the fourth from the right\, the new ones are
all the others. All terms with δF are omitted.\n\nThe formulae for observ
able characteristics of these resonances have been obtained. New PC effect
s have been found and discussed: 1) numerous three-and four correlations i
n the ground state\, 2) various induced interactions caused by the exchang
e of phonon\, 3) (for the first time in TFFS) two-phonon configurations\,
4) dynamic effects of tadpole\, 5) the first and second variations of the
effective interaction δF in the phonon field. These effects should have m
any manifestations\, in particular\, for the description of the fine struc
tures of PDR and GMR. Most of these effects should give a noticeable numer
ical contribution. Self-consistency gives a great predictive strength of t
he theory\, which is necessary for unstable nuclei\, astrophysics and nucl
ear data.\n1.A.B. Migdal\, Theory of Finite Fermi Systems and Properties o
f Atomic Nuclei\n(second edition)\, Nauka\, Moscow\, (1983).\n2. V.A. Khod
el\, E.E.Saperstein\, Phys.Rep. 92\, 183 (1982) .\n3. S.P.Kamerdzhiev\, M.
I. Shitov\, EPJA \, 56\, 265 (2020).\n4. S.P. Kamerdzhiev\, M.I. Shitov\,
Phys. At. Nucl. 84\, 649 (2021).\n\nhttps://events.sinp.msu.ru/event/8/co
ntributions/281/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/281/
END:VEVENT
BEGIN:VEVENT
SUMMARY:ROTATIONAL SPECTRA OF EVEN-EVEN ACTINIDE AND RARE-EARTH NUCLEI
DTSTART;VALUE=DATE-TIME:20220715T093000Z
DTEND;VALUE=DATE-TIME:20220715T095000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-294@events.sinp.msu.ru
DESCRIPTION:Speakers: Abdurahim Okhunov (International Islamic University
Malaysia)\nAn approach based on the idea that the spinning nucleus being s
tretched out along the symmetry axis under the influence of some sort of c
entrifugal force has been proposed. Our approach led to the modified formu
la to describe the dependence of the moment of inertia on the angular mome
ntum.\n\nhttps://events.sinp.msu.ru/event/8/contributions/294/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/294/
END:VEVENT
BEGIN:VEVENT
SUMMARY:DIRECT ONE-NEUTRON DECAY OF THE ISOSCALAR GIANT DIPOLE RESONANCE I
N MEDIUM-HEAVY SPHERICAL NUCLEI: A SEMI-MICROSCOPIC DESCRIPTION
DTSTART;VALUE=DATE-TIME:20220712T132000Z
DTEND;VALUE=DATE-TIME:20220712T134000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-301@events.sinp.msu.ru
DESCRIPTION:Speakers: Mikhail Gorelik (Moscow Economic School)\nDirect one
-nucleon decay of giant resonances (GRs) is the subject of permanent (but
not-too-intensive) experimental and theoretical studies. They allow one to
get information on GR structure and decay mechanisms. Decay probabilities
are usually deduced from a common analysis of cross sections of direct in
clusive and “decay” reactions. In Ref. [1]\, direct one-neutron decay
of Isoscalar Giant Dipole Resonance (ISGDR) in 90Zr\, 116Sn\, and 208Pb ha
ve been studied via the (α\,α^' )- and (α\,α^' n)-reactions. To some e
xtent\, this study has been stimulated by predictions made in Ref. [2] for
partial branching ratios b_μ of direct one-neutron ISGDR decay accompani
ed by population of neutron-hole states μ^(-1) in product nuclei. A simpl
e extension of standard and nonstandard continuum-RPA versions to taking p
henomenologically the spreading effect into account has been exploited in
Ref. [2]. The experimental values b=∑_μ▒b_μ (the sum is taken over
a few valence neutron-hole states) were found in Ref. [1] to be essentiall
y less than the respective predicted values.\nIn the present work\, we\, f
irst\, specify the approach of Ref. [2]\, employing for evaluation of b_μ
values the semi-microscopic Particle-Hole Dispersive Optical Model (see\,
e.g.\, Ref. [3] and references therein) and\, secondly\, use the alternat
ive definition for b_μ employed in Ref. [1]. These points allow us to red
uce markedly the difference between theoretical and experimental b values
related to direct one-neutron decay of ISGMR in the above-mentioned nuclei
. \nThis work is partially supported by the Russian Foundation for Basic R
esearch\, under Grant no. 19-02-00660 (M.L.G.\, B.A.T.\, M.H.U.)\, by the
US Department of Energy\, under Grant no. DE-FG03-93ER40773 (S.S.)\, and b
y the Program “Priority – 2030” for National Research Nuclear Univer
sity “MEPhI” (M.H.U.).\n\n1. Hunyadi M.\, Van den Berg A.M.\, Davids B
.\, Harakeh M.N. et al.\, Phys. Rev. C 75\, 014606 (2007).\n2. Gorelik M.L
.\, Safonov I.V.\, and Urin M.H.\, Phys. Rev. C 69\, 054322 (2004).\n3. Go
relik M.L.\, Shlomo S.\, Tulupov B.A.\, and Urin M.H.\, Phys. Rev. C 103\,
034302 (2021).\n\nhttps://events.sinp.msu.ru/event/8/contributions/301/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/301/
END:VEVENT
BEGIN:VEVENT
SUMMARY:First tests on GRAND set-up
DTSTART;VALUE=DATE-TIME:20220712T124000Z
DTEND;VALUE=DATE-TIME:20220712T130000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-251@events.sinp.msu.ru
DESCRIPTION:Speakers: Alena Kuznetsova (JINR)\nGRAND is a Gas-filled Recoi
l Analyzer and Nuclei Detector (see Fig.1)\, which created for experiments
on the synthesis of super heavy elements. Facility is installed at 4th be
am line of the cyclotron DC-280[2] in the SHE Factory at FLNR [1]. This se
parator has the scheme QvDhQhQvD. Helium with a pressure of P=0.7-1.5 mBa
is used as the gas. The ion optical calculations for the complete system h
ave been checked by placing 226Ra source at the target position and transp
orting the emitted α-particles to a position sensitive detector at the fo
cal plane.\n\nAs well as tests with complete fusion reactions 174Yb(48Ca\,
xn)222Th*\, 170Er(48Ca\,xn)218Ra* and 208Pb(48Ca\,xn)256No* were done. \n
\n1. S. Dmitriev\, et al.\, Status EPJ Web Conf.131 (08001) (2016) 1-6. \n
2. G.G. Gulbekian\, et al.\, Phys. Part. Nuclei Lett. 16 (6) (2019) 866-87
5.\n\nhttps://events.sinp.msu.ru/event/8/contributions/251/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/251/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SIZE ISOMERS IN LIGHT NUCLEI
DTSTART;VALUE=DATE-TIME:20220712T093000Z
DTEND;VALUE=DATE-TIME:20220712T095000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-583@events.sinp.msu.ru
DESCRIPTION:Speakers: Alla Demyanova (NRC KURCHATOV INSTITUTE)\nThe size o
f a nucleus defined by the radius of its nucleon (proton and neutron) dens
ity distribution and the proton charge distribution is one of the most fun
damental and important nuclear characteristics. Nuclear radius determines
the basic properties of nuclei and is a consequence of the fundamental fea
tures of the strong interaction.\nThe development of methods of measuring
the radii of nuclei in their short-lived excited states led to discovery o
f new classes of states\, which were named “the size isomers”.\nUp to
now two groups of the size isomers were identified: the excited states wit
h halos ($^{9}$Be\, $^{11}$Be\, $^{13}$C\, $^{13}$N) and some specific alp
ha cluster states ($^{11}$B\, $^{12}$C\, $^{13}$C). All the observed state
s are diluted\, however\, some indication to possible existence of more co
mpact than the ground states was obtained as well (in $^{13}$C).\nThe phen
omenon of size isomerism occurred to be not a rare one especially if one t
akes into account that rotational bands are based on some of such states.
The structure of size isomers is related with some new features\, e.g.\, r
otating halos\, halos in continuum\, different types of quasimolecular con
figurations. Some rudimentary signs of alpha particle condensation (a “g
host“of condensate) were observed (in the Hoyle state of $^{12}$C)\, ho
wever\, one cannot speak about confirmation of this ambitious theory.\n\nh
ttps://events.sinp.msu.ru/event/8/contributions/583/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/583/
END:VEVENT
BEGIN:VEVENT
SUMMARY:STUDY OF 209Bi(γ\,xn) REACTIONS IN ENERGY REGION UP TO 100 MeV
DTSTART;VALUE=DATE-TIME:20220712T122000Z
DTEND;VALUE=DATE-TIME:20220712T124000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-506@events.sinp.msu.ru
DESCRIPTION:Speakers: Mikhail Demichev (JINR)\nIn order to follow relative
yields of 209Bi(γ\,xn) reactions\, samples of natural bismuth were expos
ed in LINAC 200 bremsstrahlung beam at several different energies (40 MeV\
, 60 MeV\, 80 MeV and 100 MeV). Activities of eight obtained products of p
hotonuclear reactions with different neutron multiplicity\, from (γ\,2n)
to (γ\,9n) were detected. Relative yields were calculated for all of the
m. All measurements were normalized on 206Bi yield.\n\nObtained yields wer
e compared with the results already available in literature. The data in t
he literature are not very abundant and in some cases the yields differ by
a two orders of magnitude. In all measurements\, including this one\, it
was confirmed that the reaction yield decreases very sharply with the num
ber of neutrons emitted. It has also been observed that for a given multip
licity of neutrons\, the relative yield does not depend significantly on m
aximal energy of the bremsstrahlung. \n\nYields obtained by measurements a
re compared with the results of theoretical calculations. Calculation have
been performed using the combination of evaporation and exciton models [1
]. The level densities employed in the model have been calculated microsco
pically to take into account shell effects and their dependence on excitat
ion energy [2].\n\n[1] B. S. Ishkhanov and V. N. Orlin\, Physics of Atomic
Nuclei 71\, No. 3\, pp. 493–508 (2008).\n[2] A.Rahmatinejad\, A.N.Bezb
akh\, T.M.Shneidman\, G.Adamian\, N.V.Antonenko\, P.Jachimowicz\, M.Kowal\
, Phys.Rev. C 103\, 034309 (2021).\n\nhttps://events.sinp.msu.ru/event/8/c
ontributions/506/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/506/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SMOOTHNESS OF MASS SURFACE OF ODD ACTINIDE NUCLEI AND PAIRING ENER
GIES
DTSTART;VALUE=DATE-TIME:20220714T151500Z
DTEND;VALUE=DATE-TIME:20220714T153500Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-654@events.sinp.msu.ru
DESCRIPTION:Speakers: A. K. Vlasnikov ()\nAs it was shown in [1\,2]\, the
mass surface M of odd deformed atomic nuclei with 150 < A < 190 in the vic
inity of a given number of protons can be described with good accuracy by
the sum of two terms:\n μ–a Tailor series expansion up to the second or
der by degrees of deviation of the number of nucleons from the given value
s:\n PN (PZ) – neutron (proton) pairing energy\, depending on the state
of odd nucleon.\nFor example\, for odd neutron number (N^' ) nuclei:\nM(N^
'\,Z)=μ(N^'\,Z)+P_N (N^'\,Z)\,\nhereafter the apostrophe denotes an odd n
umber (N neutrons\, Z protons). \nA smooth part of the mass surface μ(N^'
\,Z) can be defined from masses M(N^'+s^'\,Z+t) of a few adjacent even-eve
n nuclei using the second-order decomposition:\nμ(N^'\,Z)=M(N^'+s^'\,Z+t)
- s^' d_1n-td_1p-〖1/2 s〗^'2 d_2n-〖1/2 t〗^2 d_2p-std_(1n\,1p).\nThe
re is some uncertainty in the values of μ(N^'\,Z)\,d_1n\,d_1p\,d_2n\,d_2p
\,d_(1n\,1p) due to the different sets of reference even-even nuclei.\n
The first set (s-approximation) includes masses of even-even nuclei with t
he same Z and neutron numbers N^'±1\,N^'±3 . In this case t=0 and\nd_1n=
[M(N^'+1\,Z)-M(N^'-1\,Z)]⁄2\;\nd_2n=[M(N^'+3\,Z)+M(N^'-3\,Z)-M(N^'+1\,Z)
-M(N^'-1\,Z)]⁄2.\nThen μ(N^'\,Z)= M(N^'+1\,Z)-d_1n-d_2n⁄2.\nThe secon
d set (st-approximation) uses reference even-even nuclei with charges Z±2
\,Z±4 and neutron numbers N^'±1\,N^'±3 so that the mass number of these
nuclei differs from the mass number of odd nucleus under consideration by
1 or 3\, i. e. (N^'±1\,Z∓2)\, (N^'±1\,Z±2)\, (N^'±1\,Z∓4)\, (N^'
±3\,Z∓2). This approximation leads to another formulae for d_1n and d_2
n.\nThe calculations of these parameters for U and Th odd actinide nuclei
have been conducted. The results show that values of d_1n and d_2n slightl
y differ for different sets of reference even-even nuclei\, however the va
lues of neutron pairing energies for both approximations are withing the e
mpirical error limits.\n\n1. D.G. Madland and J.R. Nix\, Nucl. Phys. A 476
\, 1 (1988).\n2. A.K. Vlasnikov\, A.I. Zippa and V.M. Mikhajlov\, Bull. Ru
ss. Acad. Sci.: Phys. 80\, 905 (2016)\; 81\, 1185 (2017)\; 84\, 919 (2020)
\; 84\, 1191 (2020)\; 84\, 1309 (2020).\n3. https://www-nds.iaea.org/amdc/
\n\nhttps://events.sinp.msu.ru/event/8/contributions/654/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/654/
END:VEVENT
BEGIN:VEVENT
SUMMARY:RECENT PROGRESS IN DESCRIPTION OF NN SCATTERING WITH THE DIBARYON
MODEL
DTSTART;VALUE=DATE-TIME:20220715T080000Z
DTEND;VALUE=DATE-TIME:20220715T082000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-257@events.sinp.msu.ru
DESCRIPTION:Speakers: Olga Rubtsova (Lomonosov Moscow State University\, S
kobeltsyn Institute of Nuclear Physics)\nWe review the recent results obta
ined within the dibaryon model for NN interaction [1-4]. The model takes i
nto account the formation of the intermediate six-quark (dibaryon) state i
n each partial wave. The respective mechanism leads to an energy-dependent
term in the interaction which reflects the coupling with the internal non
-nucleonic channel.\n \nThe substantial progress in the description of ela
stic and inelastic NN scattering in different partial channels has been ac
hieved by taking into consideration the parameters of the dibaryon resonan
ces found from experiments and partial wave analyses (PWA). As an illustra
tion\, elastic and inelastic NN scattering amplitudes for all the lowest p
artial configurations with the total angular momentum up to J = 3 are pres
ented in comparison with the NN PWA data in a broad energy range from zero
to Tp = 0.7-1.2 GeV. Simultaneously\, the model gives the dibaryon resona
nce parameters very close to the experimental ones for the NN channels whe
re the respective data exist and predicts new resonances in the NN channel
s 3P1\, 1P1\, 3D2 and 1F3\, where dibaryon states have not been detected t
o date. \n\nImportant inelastic processes such as pion production in NN sc
attering can also be described within the model [3\,4]. The recent results
for pion production with account of particular dibaryon resonances are di
scussed as well. \n\n1. V.I. Kukulin et al.\, Phys. Lett. B 801\, 135146
(2020).\n2. V.I. Kukulin et al.\, Eur. Phys. J. A 56\, 229 (2020).\n3. O.A
. Rubtsova\, V.I. Kukulin\, and M.N. Platonova\, Phys. Rev. D 102\, 114040
(2020).\n4. M.N. Platonova and V.I. Kukulin\, Phys. Rev. D 103\, 114025 (
2021).\n\nhttps://events.sinp.msu.ru/event/8/contributions/257/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/257/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hydrogen Atom in Strong Elliptically Polarized Laser Fields within
Discrete-Variable Representation
DTSTART;VALUE=DATE-TIME:20220715T122000Z
DTEND;VALUE=DATE-TIME:20220715T124000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-551@events.sinp.msu.ru
DESCRIPTION:Speakers: Sara Shadmehri (Joint Institute for Nuclear Research
)\nThe nondirect product discrete variable representation (npDVR) is devel
oped for the time-dependent Schrödinger equation with non-separable angul
ar variables and is applied to a hydrogen atom in elliptically polarized s
trong laser fields. The 2D npDVR is constructed on spherical harmonics ort
hogonalized on the 2D angular grids of the Popov and Lebedev 2D cubatures
for the unit sphere [1]. With this approach we have investigated the dynam
ics of a hydrogen atom initially in its ground state in elliptically pola
rized laser fields with the intensity up to I=10^14 W/cm2 and wavelength o
f λ=800 nm. For these parameters of the laser field and the entire range
of ellipticity variation\, we have calculated the total excitation and io
nization yields of the atom. The performed analysis of the method converge
nce shows that the achieved accuracy of our calculations significantly exc
eeds the accuracy of recent works of other authors relevant to the problem
[2]\, due to the high efficiency of the 2D npDVR in approximating the ang
ular part of the 3D time-dependent Schrödinger equation. We also propose
a new simple procedure for infinite summation of the transition probabili
ties to the bound states of the hydrogen atom in calculating the total exc
itation yield and prove its accuracy by comparison with conventional metho
ds. The obtained results show the potential prospects of the 2D npDVR for
investigating atomic dynamics in even stronger laser fields\, where it is
required to go beyond the dipole approximation and take into account relat
ivistic effects.\nThe work was supported by the Russian Science Foundation
under Grant No. 20-11-20257.\n1. S. Shadmehri\, S. Saeidian and V. S. Mel
ezhik\, J. Phys. B 53\, 085001 (2020).\n2. X. Gao and X -M Tong\, Phys. Re
v. A 100\, 063424 (2019).\n\nhttps://events.sinp.msu.ru/event/8/contributi
ons/551/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/551/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Potential splitting approach for scattering problem for few-body q
uantum systems
DTSTART;VALUE=DATE-TIME:20220715T101000Z
DTEND;VALUE=DATE-TIME:20220715T103000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-415@events.sinp.msu.ru
DESCRIPTION:Speakers: Evgeny Yarevsky (St Petersburg State University\, St
Petersburg\, Russia)\n**Potential splitting approach for scattering probl
em for few-body quantum systems**\nE.A. Yarevsky${}^1$\, S.L. Yakovlev${}^
1$\n${}^1$St Petersburg State University\, St Petersburg\, Russia\; \nE-ma
il: e.yarevsky@spbu.ru\n\nScattering problem for few-body quantum systems
is of great importance for various fields of modern quantum physics. The c
omplicated boundary conditions at large distances\, especially for slowly
decreasing potentials\, represent the main difficulty for this problem [1]
. While several methods have been developed for constructing solutions to
the scattering problem\, mathematically sound and computationally effectiv
e approaches are still in demand.\n\nWe present an approach based on split
ting the reaction potential into a finite range part and a long range tail
part to describe scattering in the case of the Coulomb interaction [2\,3]
. The solution to the Schrödinger equation for the long range tail is use
d as an incoming wave. The scattering problem is then reformulated into an
inhomogeneous Schrödinger equation with asymptotic outgoing waves. This
equation is solved with the exterior complex scaling technique. The develo
ped approach has been illustrated with calculations of scattering processe
s in few atomic and molecular systems.\n\n1. L.D. Faddeev\, S.P. Merkuriev
\, Quantum Scattering Theory for Several Particle Systems. Kluwer\, Dordre
cht (1993).\n2. M.V. Volkov\, E.A. Yarevsky\, S.L. Yakovlev\, Europhys. Le
tt. 2015. V. 110. 30006.\n3. E. Yarevsky\, S.L. Yakovlev\, N. Elander\, J.
Phys. B: At. Mol. Opt. Phys. 2017. V. 50. 055001.\n\nhttps://events.sinp.
msu.ru/event/8/contributions/415/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/415/
END:VEVENT
BEGIN:VEVENT
SUMMARY:POSSIBILITIES TO IMPROVE VARIATIONAL CALCULATIONS USING OSCILLATO
R BASIS
DTSTART;VALUE=DATE-TIME:20220715T070000Z
DTEND;VALUE=DATE-TIME:20220715T072000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-241@events.sinp.msu.ru
DESCRIPTION:Speakers: Vasily Kulikov (Skobeltsyn Institute of Nuclear Phys
ics\, Lomonosov Moscow State University)\nOscillator basis is widely used
in nuclear structure studies\, e. g.\, within *ab initio* No-Core Shell Mo
del (NCSM) [1]. A problem faced by the NCSM calculations is an exponential
grows of the many-body basis dimension and of the number of non-zero Hami
ltonian matrix elements which restricts the accuracy of the results and th
e NCSM applicability to heavier nuclei. This difficulty can be overcome by
using the complete Hamiltonian matrix up to some excitation quanta *N*_{m
ax} and extending it to a larger excitation quanta *N'*_{max} by kinetic e
nergy *T* matrix elements only (*T* extension). The *T* extension can be c
onsidered as a simplified version of the Symmetry-Adapted NCSM (SA-NCSM) [
2] which utilizes the Sp(3\,R) symmetry to extend the Hamiltonian matrix s
ince T is one of the Sp(3\,R) generator. The *T*-extended Hamiltonian matr
ix has an essentially smaller number of non-zero matrix elements and impro
ves predictions for binding energies. The Hamiltonian matrix extended up t
o infinite *N'*_{max} in a channel that is supposed to dominate in the asy
mptotics of the wave function of bound state of interest\, can be used to
calculate the S matrix by means of the HORSE formalism [3] and to locate n
umerically its pole associated with the bound state that makes it possible
to obtain a very accurate prediction for the binding energy and asymptoti
c normalization coefficient (ANC). The utilization of the complete HORSE f
ormalism within the NCSM is impractical because it requires calculation of
extremely large number of the NCSM eigenstates\; however\, one can use it
s simplified version SS-HORSE [4] to design an extrapolation technique for
binding energies and ANC. An interesting and important convergence accele
ration of the above approaches is the smoothing of potential energy matrix
elements suggested in Ref. [5]. We illustrate the above possibilities usi
ng a model problem.\n\n 1. B. R. Barrett\, P. Navrátil\, and J. P. Vary\,
Prog. Part. Nucl. Phys. **69**\, 131 (2013).\n 2. K. D. Launey\, T. Dytry
ch\, and J. P. Draayer\, Prog. Part. Nucl. Phys. **89**\, 101 (2016).\n 3.
J. M. Bang\, A. I. Mazur\, A. M. Shirokov\, Yu. F. Smirnov\, and S. A. Za
ytsev\, Ann. Phys. (N.Y.) **280**\, 299 (2000). \n 4. A. M. Shirokov\, A.
I. Mazur\, I. A. Mazur and J. P. Vary\, Phys. Rev. C **94**\, 064320 (2016
).\n 5. B. Gyarmati\, A. T. Kruppa\, and J. Révai\, Nucl. Phis A **326**
\, 119 (1979).\n\nhttps://events.sinp.msu.ru/event/8/contributions/241/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/241/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutron multiplicity distributions for 250No spontaneous fission f
rom ground state or at the decay of the isomeric state
DTSTART;VALUE=DATE-TIME:20220712T080000Z
DTEND;VALUE=DATE-TIME:20220712T082000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-647@events.sinp.msu.ru
DESCRIPTION:Speakers: Roman Mukhin (Joint Institute for Nuclear Research)\
nThe spontaneous fission is one of the decay channel on a par with α- and
β+-decays for heavy and super-heavy isotopes (Z > 100). There are no est
ablished models that could describe all details of spontaneous process wel
l yet. Therefore\, experimental studies of such processes are high-interes
ting and important.\n \nThe combination of relatively high formation cross
-section in complete fusion reactions and discovered K-isomer state living
longer than its ground state [1] makes 250No isotope attractive to experi
mental study. The SHELS separator [2] and SFiNx detection system [3] at FL
NR JINR\, Dubna\, Russia allows us carrying out experiments to study promp
t neutron yields from 250No spontaneous fission. \n\nThe previous experime
nt [4] hinted at possibility of spontaneous fission directly from an isome
tric state 250mNo. The difference between average numbers of neutrons per
fission with corresponding lifetimes (for ground and isometric states) was
quite large but statistically insignificant (≈2σ). Thus\, conclusion a
bout spontaneous fission from isomeric state possibility couldn’t be dra
wn.\n\nIn the beginning of the 2022 the new experiment was carried out usi
ng modern analysis techniques and the detectors array with higher efficien
cy than in the previous one [4]. Approximately 1350 spontaneous fissions
of 250No were registered (vs ≈700 in [4]). Two activities with different
lifetimes associated with 250No and 250mNo were observed. The difference
between average numbers of emitted spontaneous fission prompt neutrons for
both activities are statistically insignificant (<1σ). Prompt neutrons m
ultiplicity emission probability distributions for both activities separat
ely and combined were restored using statistical regularization method [5]
. \n\nThe prompt neutron multiplicities distributions restoring technique
will be discussed in the report. Furthermore\, the structure of such distr
ibutions will be shown in conjunction with theoretical interpretation of p
rocesses. \n\n1. J. Kallunkathariyil et al.\, Phys. Rev. C 101\, 011301 (2
020)\n2. A.G. Popeko et al.\, NIMB\, 376\, 140-143 (2016)\n3. A.V. Isaev e
t al.\, Phys. of Part. and Nucl. Let.\, 19\, 1 (2022)\n4. A.I. Svirikhin e
t al. Phys. of Part. and Nucl. Let.\, 14\, 4 (2017)\n5. R.S. Mukhin et al.
\, Phys. of Part. and Nucl. Let\, 18\, 4 (2021)\n\nhttps://events.sinp.msu
.ru/event/8/contributions/647/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/647/
END:VEVENT
BEGIN:VEVENT
SUMMARY:ON SHORT-RANGE CORRELATIONS IN ATOMIC NUCLEI
DTSTART;VALUE=DATE-TIME:20220715T124000Z
DTEND;VALUE=DATE-TIME:20220715T130000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-338@events.sinp.msu.ru
DESCRIPTION:Speakers: Boris Kostenko (Joint Institute for Nuclear Research
)\nAtomic nuclei\, to be drops of a Fermi liquid\, have a number of proper
ties in common with liquid drops of 3He atoms\, as well as with electrons
in metal clusters. For example\, their energy levels have a similar shell
structure and are characterized by the same magic numbers: 2\, 8\, 20 etc.
[1]. Besides\, they all contain an admixture of the two-fermion short-ra
nge correlations (2F-SRC) which are pairs of fermions having a momentum u
p to 2.5 times greater than the Fermi momentum\, though a magnitude of the
ir sum takes values expectable in the ideal Fermi gas model. The 2F-SRC ar
ise naturally as corrections to the ideal Fermi gas model at taking into a
ccount a repulsion of fermions in the form of a non-zero scattering length
at short ditances [2]. Since most of the time such fermions are in the fr
ee flight\, it was natural to assume that there must also exist a quasi-fr
ee knocking out one of them from a 2F-SRC pair at its hard collision with
a projectile. Until now this mechanism has been considered the most plausi
ble at the interpretation of experimental data on the scattering of lepton
s and hadrons in atomic nuclei within the framework of the 2F-SRC model\,
see\, e.g.\, [3\,4]. Our analysis of the experiment [4]\, however\, has sh
own that the nucleons of the SRC pair which had large momentum (of the ord
er of 550 MeV/c) were in a mutual potential well with a depth of about 300
MeV at the instant of their knocking-out. It is easy to calculate that be
fore entering the potential well\, the nucleons must have had a momentum m
uch less than the Fermi one. It follows from this that the generally accep
ted interpretation of the short-range correlations in atomic nuclei is har
dly applicable. \n\nIn the presented report\, the question is discussed
to what extent the assumption of the existence of such a deep potential we
ll is compatible with modern phenomenological models of the N-N interactio
n. It is indicated that there is a natural possibility of estimating the s
ize of the potential well from the registration of quasi-bound states with
a nonzero orbital momentum\, formed by multiple reflections of nucleons f
rom its boundary. This physical picture can be also appropriate for interp
reting experimental hints on the existence of light dibaryons with a mass
below the meson production threshold [5].\n\n\n1. V. R. Pandharipande\, I.
Sick\, P. K. A. deWitt Huberts\, Rev. Mod. Phys. 69\, 981 (1997).\n2. W.
Czyż\, K. Gottfried\, Nucl. Phys.\, 21\, 676 (1960).\n3. A. Tang et al.\,
Phys. Rev. Lett. 90\, 042301 (2003). \n4. R. Shneor et al. (Jefferson Lab
Hall A Collabor.)\, Phys. Rev. Lett. 99\, 072501 (2007). \n5. B. F. Koste
nko\, Phys. Part. Nucl.\, 53\, 242 (2022).\n\nhttps://events.sinp.msu.ru/e
vent/8/contributions/338/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/338/
END:VEVENT
BEGIN:VEVENT
SUMMARY:NUCLEAR DATA AND THE STANDARD MODEL PARAMETRS
DTSTART;VALUE=DATE-TIME:20220715T151000Z
DTEND;VALUE=DATE-TIME:20220715T153000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-648@events.sinp.msu.ru
DESCRIPTION:Speakers: Sergey Sukhoruchkin (Petersburg Nuclear Physics Inst
itute NRC "Kurchatov Institute" 188300 Gatchina)\nWe consider fundamental
aspects of nuclear physics and particle mass spectrum. The Standard Model
with representation: SU(3)col × SU(2)L × U(1)Y [1] is the basic theory
of all interactions. The Nonrelativistic Constituent Quark Model is a part
of hadronic physics - an important component of the Standard model. The m
ain NRCQM parameters are the pion mass mπ = 140 MeV\, the initial constit
uent quark mass Mq = mΞ / 3 = me(α/2π)-1 = 441 MeV\, introduced as "gam
mon" by P. Kropotkin\, and the standard estimate of the constituent quark
mass Mωq = mω/2 = 391 MeV\, were recently confirmed by the observation o
f the exact representation of the nucleon masses by integers me and an add
itional shift dm = k (δmN/8) with k = 1 and k = 9 for neutron and proton\
, respectively (CODATA relations [1] with δmN = mn - mp):\nmn = 115•16
me - me - δmN/8\; mp = 115•16me - me - 9(δmN/8)\; dmπ = (α/2π)mπ.\
nThese relations contain integer representation of particle masses with a
period 16me=δ: mµ=13δ - me\, mπ=17δ + me\, Mωq = 3•16δ = 48δ\, M
q= 3•18δ = 54δ.\n The QED radiative correction α/2π =116•10-5 (t
ogether with fermion masses) is an important parameter of the Standard mod
el and is responsible for the influence of physical vacuum on the magnetic
moment and particle mass [1\,2].\nStable nuclear intervals 161 keV=δmN/8
\, 1293 keV= δmN and 3067 keV= 6me were found as maxima in independent sp
acing distributions in many nuclei. The interval 3067 keV / 2 = 3me is clo
se to md / 3 (md = 4670(48) keV). The mass of c-quark mc=1270(20) MeV is
close to 9mπ\, and the mass of b-quark mb=4180(30) MeV is close to 9Mq. T
he analysis of particle masses and nonstatistical effects in nuclear data\
, carried out in the 1960s\, showed the coincidence of the ratios between
the electron mass me (the main parameter of the Standard model) and the ma
ss of the constituent quark Mq with QED radiative correction α/2π = 115.
96•10-5. Simultaneously\, the same relationship was found empirically be
tween the stable intervals of fine (ε` = 1.2 eV) and hyperfine (ε`` = 1.
34 eV = 5.5 eV/4) structures in neutron resonances and nuclear levels in t
he works of IAE and ITEP (under the direction of I. V. Kurchatov and A.I.
Alikhanov). In this paper\, we show confirmation of the dimensionless rati
o\, close to the QED radiative correction\, in modern high-precision data
on neutron resonances 232Th\, 234U\, 238U and 240-242Pu [3]. Correlation a
nalysis of nuclear data provides independent confirmation of integer relat
ions in parameters of Standard model\, a theory of all interactions.\n\n1.
S.I. Sukhoruchkin\, Nucl. Part. Phys. Proc. 312-317\, 185 (2021).\n2. V.
Belokurov\, D. Shirkov\, Theory of Part. Interacions. AIP (1991).\n3. S.I.
Sukhoruchkin\, Z.N. Soroko\, D.S. Sukhoruchkin and M.S. Sukhoruchkina\,.
Proc. ISINN-28\, Dubna\, 2021. JINR E3-2021-48\, pp. 234\, 247\, 259.\n\nh
ttps://events.sinp.msu.ru/event/8/contributions/648/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/648/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Evolution of the phenomenologically determined collective potentia
l along the chain of Zr isotopes
DTSTART;VALUE=DATE-TIME:20220715T122000Z
DTEND;VALUE=DATE-TIME:20220715T124000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-319@events.sinp.msu.ru
DESCRIPTION:Speakers: Evgenii Mardyban (JINR/BLTP)\nThe properties of the
collective low-lying states of Zr isotopes indicate that some of these sta
tes are mainly spherical and the other are mainly deformed ones.\nIn one o
f our previous works\, it was shown that the structure of low-lying collec
tive states of $^{96}$Zr can be satisfactorily described within the framew
ork of a geometric collective model based on the Bohr Hamiltonian with a p
otential that supports the existence of various forms of the nucleus. Base
d on these results\, the question arises about the possibility of investig
ating the properties of low-lying collective states of $^{92-102}$Zr on t
he basis of a five-dimensional geometric quadrupole collective model.\n Th
e quadrupole-collective Bohr Hamiltonian depending on both $\\beta$ and $\
\gamma$ shape variables with a potential having spherical and deformed min
ima\, is applied. The relative depth of two minima\, height and width o
f the barrier\, rigidity of the potential near both minima are determined
so as to achieve the best possible description of the observed properties
of the low-lying collective quadrupole states of $^{92-102}$Zr.\n Satisf
actory agreement with the experimental data on the excitation energies and
the E2 reduced transition probabilities is obtained. The evolution of th
e collective potential with increase of $A$ is described and the distribut
ions of the wave functions of the collective states in $\\beta-\\gamma$ p
lane are found.\nIt is shown that the low-energy structure of $^{92-102}$Z
r can be described in a satisfactory way within the Geometrical Collective
Model with the Bohr Hamiltonian. The $\\beta$-dependence of the potenti
al energy is fixed to describe the experimental data in a best possible wa
y. The resulting potential evolves with $A$ increase from having only one
spherical minimum in $^{92}$Zr\, through the potentials having both spheri
cal and deformed minima\, to the potential with one deformed minimum in $^
{102}$Zr. A $\\beta$-dependence of the wave functions is presented in a se
t of figures illustrating their distribution over $\\beta$.\n\nhttps://eve
nts.sinp.msu.ru/event/8/contributions/319/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/319/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nuclear shape evolution in the lead region: neutron-deficient bism
uth and gold isotopes
DTSTART;VALUE=DATE-TIME:20220715T120000Z
DTEND;VALUE=DATE-TIME:20220715T122000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-269@events.sinp.msu.ru
DESCRIPTION:Speakers: Pavel Molkanov (Petersburg Nuclear Physics Institute
of National Research Center “Kurchatov Institute”)\nThe shape and the
size of a nucleus are among its most fundamental properties. Usually\, is
otopic dependence of nuclear radii is smooth\, however the neutron-deficie
nt isotopes in the lead region (near Z = 82) exhibit the richest manifesta
tion of shape evolution and shape coexistence phenomena which lead to mark
ed irregularities in the radii isotopic trends. The behavior of the ground
and isomeric states shape differs noticeably for different Z in this regi
on. While in Hg isotopic chain (Z = 80) jump-like odd-even shape staggerin
g was observed at N = 101 - 105 [1]\, for Po nuclei (Z = 84) an early onse
t and gradual increase of deformation was found at N < 113 [2]. At the sam
e time the neutron-deficient Tl and Pb nuclei (Z = 81\, 82) remain essenti
ally spherical\, up to and beyond the neutron mid-shell at N = 104 [3].\nR
ecently a successful investigations of bismuth and gold isotopes were perf
ormed at ISOLDE facility (CERN) using the in-source resonance-ionization s
pectroscopy technique. This highly efficient method provides information a
bout isotope shift (IS) and hyperfine structure (hfs) of optical lines. Ch
anges in nuclear mean-squared charge radius ($\\delta\\langle r^2\\rangle$
) and the nuclear electromagnetic moments can be deduced from the IS and h
fs. These nuclear observables are sensitive to the radial distribution of
the nuclear wavefunction\, and thus to the shape evolution across the nucl
ear landscape.\nIn this work\, we present the results of the IS and hfs me
asurements for neutron deficient Bi (Z = 83\, N = 104-108) and Au isotopes
(Z = 79\, N = 97-104).\nThe most interesting findings are as follows:\n1)
The huge staggering in radii was observed for $^{188}Bi^{g}$ relative to
$^{187\,189}Bi^{g}$ at the same neutron number (N = 105) and with the same
amplitude as in the famous Hg case [1]. Quadrupole moment of $^{188}Bi^{g
}$ confirms the strong prolate deformation in this nucleus [4].\n2) The is
otopes $^{180\,181\,182}Au$ keep the strong deformation\, observed earlier
for the heavier gold isotopes $^{183–186}Au$\, whilst the lightest isot
opes $^{176\,177\,179}Au$ return to near-spherical shape which is inherent
to Au isotopes with A>186.\n3) Shape coexistence was found in $^{178}Au$
which have ground and isomeric states with different deformation.\n\n1. B.
Marsh et al.\, Nature Physics 14\, 1163 (2018).\n2. T. E. Cocolios et al.
\, Phys. Rev. Lett. 106\, 052503 (2011).\n3. A. E. Barzakh\, et al.\, Phys
. Rev. C 88\, 024315 (2013).\n4. A. E. Barzakh\, et al.\, Phys. Rev. Lett.
127\, 192501 (2021).\n\nhttps://events.sinp.msu.ru/event/8/contributions/
269/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/269/
END:VEVENT
BEGIN:VEVENT
SUMMARY:INTERPLAY OF ORDER AND CHAOS IN NUCLEAR STRUCTURE
DTSTART;VALUE=DATE-TIME:20220715T143000Z
DTEND;VALUE=DATE-TIME:20220715T145000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-581@events.sinp.msu.ru
DESCRIPTION:Speakers: Rashid Nazmitdinov (Bogoliubov Laboratory of Theoret
ical Physics\, Joint Institute for Nuclear Research)\nWe demonstrate the u
niversality of the Random Matrix approach as a tool to detect the chaos-or
der transition in atomic nuclei. In particular\, shell structure phenomeno
n in octupole deformed nuclei is discussed as the example of the interplay
of regular and chaotic dynamics within the harmonic oscillator model wit
h octupole deformations as the effective nuclear structure shell model [1]
. It is shown that the chaos-order transition can occur at certain condit
ions which give rise to dynamical symmetries in chaotic dynamics of nucleo
ns\, and may explain the dominance of prolate nuclear shape in nature.\n
Naturally\, one would expect that chaotic component of intrinsic stru
cture of a finite many-body quantum system\, exhibited in its spectral pro
perties at low excitation energy\, may transform from the secondary consti
tuent to the dominant one in basic characteristics of the considered syste
m with increase of the excitation energy. This might be primarily true in
the description of decay widths of nuclear giant dipole resonances\, highl
y excited collective states which centroids are located above the neutron
threshold. Indeed\, our analysis of the dipole strength distribution in th
e lead region indicates on the onset of statistical properties close to th
ose of the Gaussian Orthogonal Ensembles. We show that employment of the r
andom distribution for the coupling between microscopic one-phonon states
and two-phonon states\, generated by the Gaussian Orthogonal Ensembles dis
tribution\, gains a better insight into the description of general proper
ties of the spreading widths [2].\n\n\n1. R.G. Nazmitdinov\, Phys.Part.Nuc
l.Letts 16\, 159 (2019).\n2. A.P.Severyukhin\, S.Åberg\, N.N.Arsenyev\, R
.G. Nazmitdinov\, Phys. Rev.C 104\, 044327 (2021).\n\nhttps://events.sinp.
msu.ru/event/8/contributions/581/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/581/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of nuclear matter density distribution in light exotic nucle
i from proton elastic scattering in inverse kinematics
DTSTART;VALUE=DATE-TIME:20220715T145000Z
DTEND;VALUE=DATE-TIME:20220715T151000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-376@events.sinp.msu.ru
DESCRIPTION:Speakers: Alexander Inglessi (Petersburg Nuclear Physics Insti
tute)\nThe proton-nucleus elastic scattering at intermediate energies is a
well-established method of investigating the nuclear matter distribution
in stable nuclei. When performed in inverse kinematics with radioactive be
ams\, it can be applied to the investigation of unstable nuclei as well.\n
\nRecently\, differential cross sections for small-angle proton elastic sc
attering on the 12\,14Be [1]\, 8B [2] and 14-17C [3] nuclei were measured
in inverse kinematics using secondary radioactive beams with energies near
700 MeV per nucleon produced with the fragment separator FRS at GSI\, Da
rmstadt. The main part of the experimental setup was the active target IKA
R\, which was used for recoil protons detection. Auxiliary detectors for p
rojectile tracking and isotope identification completed the setup. The mea
sured differential cross sections were analyzed using the Glauber multiple
scattering theory. For the evaluation of the data several phenomenologica
l nuclear matter density parametrizations were used. The nuclear matter ra
dii and radial density distributions were deduced. Extended nuclear matter
density distributions were observed in 12\,14Be isotopes and halo structu
re of 14Be was confirmed. Proton halo structure was observed for 8B. A pos
sible neutron halo structure in 15\,16C and 17C is discussed.\n\n1. S. Ili
eva et al.\, Nucl. Phys. A 875 (2012).\n2. G.A. Korolev et al.\, Phys. Le
t. B 780 (2018).\n3. A.V. Dobrovolsky et al.\, Nucl. Phys. A 1008 (2021).\
n\nhttps://events.sinp.msu.ru/event/8/contributions/376/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/376/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Behavior of moment of inertia in highly deformed 24Mg and 20Ne
DTSTART;VALUE=DATE-TIME:20220715T141000Z
DTEND;VALUE=DATE-TIME:20220715T143000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-619@events.sinp.msu.ru
DESCRIPTION:Speakers: Mariia Mardyban ()\nWe suggest the self-consistent d
escription of the ground-state moment of inertia (MI) in highly prolate li
ght nuclei 24Mg and 20Ne (with experimental equilibrium axial quadrupole d
eformations b2=0.605 and 0.72\, respectively [1]). These nuclei provide an
interesting opportunity to explore dependence of MI on the pairing\, grou
nd-state correlations and nuclear shape at extreme deformations. The calc
ulations are performed with Skyrme forces SVbas\, SkM*\, and Sly6 for defo
rmation range 0.3 < b2 < 0.9. Three approaches are applied [2]: Inglis-Bel
yaev (within Hartree-Fock-Bogoliubov method)\, QRPA Thouless-Valatin (with
in Quasiparticle Random-Phase Approximation method [3]) and ATDHF (Adiabat
ic Time-Dependent Hartree Fock method). For Inglis-Belyaev and ATDHF calcu
lations\, the code SKYAX [4] was used. All three approaches show that\, ne
ar the equilibrium deformation\, the pairing in 24Mg and 20Ne vanishes and
we get the maximum of MI. With further grow of the deformation above the
equilibrium values\, we see decrease of MI. Such behavior of MI is explai
ned by rearrangement of single-particle levels with deformation. The analy
sis reveals main two-quasiparticle contributions responsible for the behav
ior of MI in different regimes. \n\n1. Database http://www.nndc.bl.gov\n
\n 2. P.Ring and P.Schuck\, TheNuclearMany-BodyProblem (Springer-Verla
g\,Berlin\,1980)\n\n 3. A. Repko\, J. Kvasil and V.O. Nesterenko\, Phys.
Rev. C 99\, 044307 (2019).\n\n 4. P.-G. Reinhard\, B. Schuetrumpf\, and J
. A. Maruhn\, Comput. Phys. Commun. 258\, 107603 (2021).\n\nhttps://events
.sinp.msu.ru/event/8/contributions/619/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/619/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ab initio calculations of branching ratios of alpha particles\, ne
utrons and protons in the decay of excited states of beryllium isotopes.
DTSTART;VALUE=DATE-TIME:20220715T072000Z
DTEND;VALUE=DATE-TIME:20220715T074000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-380@events.sinp.msu.ru
DESCRIPTION:Speakers: Yuri Tchuvil’sky (Skobeltsyn Institute of Nuclear
Physics\, Lomonosov Moscow State University)\nThe modern theory of the st
ructure of light nuclei is actively developing due to the introduction of
ab initio (from first principles) methods of describing nuclear systems. A
n essential place among such methods is occupied by various versions of No
-Core Shell Model (NCSM) (see\, for example\, [1]) that uses huge multi-nu
cleon bases and realistic NN potentials to describe the interaction of nuc
leons. Usually\, these potentials are derived from Chiral Effective Field
Theory. The discussed approach makes it possible to successfully describe
the spectra of nuclei up to masses A ~ 16 in a wide range of energies. \n
In the literature\, there are also several successful attempts to describe
the total widths of the nucleon and cluster decay of nuclear states [2\,3
]. In our works (see Ref. [4] and Refs. therein)\, we developed a method t
hat makes it possible to solve the problem of multichannel decay of nuclei
and calculate the partial widths of decay into a variety of channels. The
subsequent publication [5] demonstrates the efficiency of the method for
unstable nuclei. \nThe current report presents the results of a study of t
he decay properties of highly excited states of beryllium isotopes. Such a
detailed calculation of the spectral characteristics of these nuclei –
level energies\, total decay widths and branching ratios of decays into ra
dically different channels in a wide energy range has been carried out for
the first time. A large list of predictions is given. \n\n1. Dytrych T.\,
Sviratcheva K. D.\, Bahri C.\, Draayer J. P.\, and Vary J. P.\, Phys. Rev
. C 76\, 014315 (2007).\n2. Quaglioni S.\, and Navratil P.\, Phys. Rev. C
79 044606 (2009).\n3. Neff T.\, Phys. Rev. Lett. 106 042502 (2011).\n4. Ro
dkin D. M.\, Tchuvil'sky Yu. M.\, Phys. Rev. C 103\, 024304.\n5. Rodkin D.
M.\, Tchuvil'sky Yu. M.\, Phys. Rev. C 104\, 044323.\n\nhttps://events.si
np.msu.ru/event/8/contributions/380/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/380/
END:VEVENT
BEGIN:VEVENT
SUMMARY:OCTUPOLE EXCITATIONS IN 238U
DTSTART;VALUE=DATE-TIME:20220712T151000Z
DTEND;VALUE=DATE-TIME:20220712T152000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-658@events.sinp.msu.ru
DESCRIPTION:Speakers: Pazlitdin Usmanov (Namangan Institute of Engineering
and Technology)\nCurrently\, one of the topical research areas in the fie
ld of the nuclear structure experimental and theoretical studies is the ex
perimental and theoretical study of the negative parity states in the acti
nide nuclei [1]. In the 238U nucleus\, rotational bands based on the groun
d and octupole vibrational states are known. Most of the experimental data
were obtained using Coulomb excitation [2] and in reactions with heavy io
ns [3\,4]. In the gamma transition probabilities from the octupole bands t
o the levels of the ground state band\, noticeable deviations from the Ala
ga rules which are valid in the adiabatic approximation reveal.\nThe exper
imental data were analyzed within the framework of microscopic and phenome
nological models [5\,6]. Results of the microscopic model [5] disagree wit
h the experiment. In [6]\, within the framework of the cluster model\, a n
umber of levels with odd spins belonging to the band were predicted\, whi
ch was confirmed by experiment [1]. \nIn this work\, within the framework
of the phenomenological model [7] considering the Coriolis mixing of octup
ole bands with \, and the energies\, state structures\, and reduced E1 t
ransition probabilities from negative parity states to the ground state ba
nd and to the states of β- and γ- bands with and are calculated. The t
heoretical results agree satisfactorily with the experimental data. \n\n1.
E. Browne\, J. Tuli\, Nucl. Data Sheets. 127\, 191 (2015).\n2. D. Ward\,
et al.\, Nucl. Phys. A 600\, 88 (1996).\n3. K. Abu Saleem\, et al.\, Phys.
Rev. C 70\, 024310 (2004).\n4. S. Zhu\, et al.\, Phys. Lett. B 618\, 51 (
2005).\n5. M. Bender\, P.H. Heenen and P. Bonche\, Phys. Rev. C 70\, 05430
4 (2004).\n6. B. Buck\, et al.\, J. Phys. G: Nucl. Part. Phys. 34\, 1985 (
2007).\n7. P. N. Usmanov\, A. A. Solnyshkin\, A. I. Vdovin\, U. S. Salikhb
aev\, Phys. At. Nucl. 77\, 1343 (2014).\n\nhttps://events.sinp.msu.ru/even
t/8/contributions/658/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/658/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Microscopic description of isoscalar giant monopole resonance: the
case of 48Ca
DTSTART;VALUE=DATE-TIME:20220714T122000Z
DTEND;VALUE=DATE-TIME:20220714T124000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-472@events.sinp.msu.ru
DESCRIPTION:Speakers: Nikolay Arsenyev (Bogoliubov Laboratory of Theoretic
al Physics\, Joint Institute for Nuclear Research)\nA comprehensive analys
is of the isoscalar giant monopole resonance (ISGMR) has long been a subje
ct of extensive theoretical and experimental research [1\,2]. The ISGMR pr
operties are presently an important problem not only from the nuclear stru
cture point of view [2\,3] but also because of the special role they play
in many astrophysical processes such as prompt supernova explosions [4] an
d the interiors of neutron stars [5].\nOne of the successful tools for des
cribing the ISGMR is the quasiparticle random phase approximation (QRPA) w
ith the self-consistent mean-field derived from Skyrme energy density func
tionals (EDF) [2\,3]. The study of the monopole strength distribution in t
he region of giant resonance involves taking into account a coupling betwe
en the simple particle-hole excitations and more complicated (two- and thr
ee-phonons) configurations [3\,6]. The main difficulty is that the complex
ity of calculations beyond standard QRPA increases rapidly with the size o
f the configuration space\, and one has to work within limited spaces. Usi
ng a finite rank separable approximation for the residual particle-hole in
teraction derived from the Skyrme EDF one can overcome this numerical prob
lem [7\,8]. \nIn the present report\, we study the effects of the coupling
between one-\, two- and three-phonon terms in the wave functions on the m
onopole strength distribution in the double magic nucleus 48Ca. Using the
same set of parameters\, we describe available experimental data [9\,10].
The effects of the phonon-phonon coupling leads to a redistribution of the
main monopole strength to lower energy states and also to higher energy t
ail [11].\nThis work was supported by the Russian Science Foundation (Gran
t No. RSF-21-12-00061).\n\n1. J.P. Blaizot\, Phys. Rev. 64\, 171 (1980).\n
2. U. Garg\, and G. Colò\, Prog. Part. Nucl. Phys. 101\, 55 (2018).\n3. N
.N. Arsenyev\, and A.P. Severyukhin\, Universe. 7\, 145 (2021).\n4. H.A. B
ethe\, Rev. Mod. Phys. 62\, 801 (1990).\n5. N.K. Glendenning\, Phys. Rev.
Lett. 57\, 1120 (1986).\n6. V.G. Soloviev\, Theory of Atomic Nuclei: Quasi
particles and Phonons. 1992. Bris-tol/Philadelphia.\n7. N.V. Giai\, Ch. St
oyanov\, and V.V. Voronov\, Phys. Rev. C. 57\, 1204 (1998).\n8. A.P. Sever
yukhin\, V.V. Voronov\, and N.V. Giai\, Eur. Phys. Jour. A. 22\, 397 (2004
).\n9. K. Howard et al.\, Phys. Lett. B. 801\, 135185 (2020).\n10. S.D. Ol
orunfunmi et al.\, arXiv:2202.00722v1 [nucl-ex] 1 Feb 2022.\n11. N.N. Arse
nyev\, and A.P. Severyukhin\, in preparation.\n\nhttps://events.sinp.msu.r
u/event/8/contributions/472/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/472/
END:VEVENT
BEGIN:VEVENT
SUMMARY:K-FORBIDDEN M1-TRANSITIONS IN 156Gd
DTSTART;VALUE=DATE-TIME:20220712T152000Z
DTEND;VALUE=DATE-TIME:20220712T153000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-659@events.sinp.msu.ru
DESCRIPTION:Speakers: Pazlitdin Usmanov (Namangan Institute of Engineering
and Technology)\nAnalysis of the available experimental data obtained for
the reactions \, and at the nucleus\, shows that almost all excited en
ergy levels up to 2.0 MeV may be assumed to be uncovered [1]. The experime
ntal data indicate the presence of a deviation from the Alaga rule. In par
ticular\, forbidden transitions from states of the band are observed.\nIn
[2\, 3]\, within the framework of the phenomenological model [4]\, which
takes into account the Coriolis mixing of the states of the rotational ban
ds\, the low-lying states of the nucleus were studied. The energies\, wav
e functions\, and electrical characteristics of the states of the rotation
al bands were calculated. The reasons leading to the non-adiabatic effects
\, which manifest themselves in energies\, wave functions of states\, and
ratios of transitions from vibrational states\, are shown.\nIn the present
paper we continue the study of the properties of the rotational states of
the nucleus . We have calculated the reduced probabilities of transitions
\, using the wave functions obtained in [2]. The effect of rotation on the
magnetic characteristics of excited states is studied. The calculated val
ues of the probabilities of transitions from the states of the and band
s are listed in the table and compared with the available experimental dat
a.\n\n1. C. W. Reich\, Nucl. Data Sheets. 113\, 2537 (2012).\n2. P. N. Usm
anov\, E. K. Yusupov\, IIUM Eng. J. 22\, 167 (2021).\n3. P. N. Usmanov\, A
. I. Vdovin\, E. K. Yusupov\, Bull. Russ. Acad. Sci.: Phys. 85\, 1102 (202
1).\n4. P. N. Usmanov\, I. N. Mikhailov\, Phys. Part. Nucl. 28\, 348 (1997
).\n\nhttps://events.sinp.msu.ru/event/8/contributions/659/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/659/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutron multiplicity of transplutonium nuclei
DTSTART;VALUE=DATE-TIME:20220715T103000Z
DTEND;VALUE=DATE-TIME:20220715T105000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-391@events.sinp.msu.ru
DESCRIPTION:Speakers: Anna Bezbakh (JINR)\nThe calculations of neutron mul
tiplicity distributions were carried out with the improved scission point
model (ISPM) [1] for 252Cf\, 248Cm\, and 246Fm nuclei. Within the ISPM the
probabilities of formation of different scission configurations as well a
s the available excitation energy at scission were found based on the calc
ulation of the potential energy as a function of mass and charge numbers o
f the fragments and their deformation parameters. In order to account for
pre-equilibrium effects\, the energy distribution between fission fragment
s and evolution of the deformation of the fragments are taken into conside
ration. The necessity of account for pre-equilibrium processes for the con
sidered nuclei is discussed. The results are compared with the experimenta
l data provided in Ref. [2] and with other models [3]. The average number
of neutrons per spontaneous fission process and the corresponding uncertai
nties are presented. \n\n1. A. V. Andreev et al.\, EPJ A 30.3\, 579 (2006)
. \n2. A.V. Isaev et. al\, arXiv:2203.11802 [nucl-ex] (2022).\n3. K.-H. S
chmidt\, B. Jurado\, C. Amouroux\, C. Schmitt\, Nuclear Data Sheets 131\,
107 (2016).\n\nhttps://events.sinp.msu.ru/event/8/contributions/391/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/391/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing Microscopic Properties of Superdeformed Nuclei
DTSTART;VALUE=DATE-TIME:20220715T095000Z
DTEND;VALUE=DATE-TIME:20220715T101000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-433@events.sinp.msu.ru
DESCRIPTION:Speakers: Poonam Jain (Sri Aurobindo College\, University of D
elhi)\nWe analyse superdeformed (SD) bands in 192Hg with the help of modif
ied variable moment of inertia (VMI) model. In this\, we obtain the values
of unknown band-head spin (I0) along with the level spin. The band-head s
pin so estimated is not known experimentally in band-3. A total of 3 exper
imentally known SD bands of 192Hg have been analyzed. Quantitatively good
results of the γ energies and the spins for Hg band are successfully obta
ined. The band-head spin for the 192Hg (b3) superdeformed band is reported
. We propose the spin assignments and level energies of the 192Hg (b3) as
an essential outcome of this work. It has now been resolved the tentative
nature of the assignments and present a unique level scheme. These outcom
es are important in near future experiments.\n\nhttps://events.sinp.msu.ru
/event/8/contributions/433/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/433/
END:VEVENT
BEGIN:VEVENT
SUMMARY:EXTRAPOLATION OF THE LOWEST STATE ENERGIES IN SUPERHEAVY EVEN-EVE
N NUCLEI
DTSTART;VALUE=DATE-TIME:20220715T091000Z
DTEND;VALUE=DATE-TIME:20220715T093000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-403@events.sinp.msu.ru
DESCRIPTION:Speakers: Alexander Efimov (PTI A.F. I.)\nIn this report the v
arious approaches [1\,2\,3] to the state energy estimations for su-perhe
avy nuclei are discussed. In [1\,2]\, for even-even nuclei\, a correlation
between the state energies and the deformation energies was found and p
arametrization of the correlation curve was obtained. For determination of
extrapolation parameters the experimentally known energies of states wer
e applied. If the proposed parametrization is successful\, then it can be
used to predict the unknown energies. For such prediction it is necessary
to have data on deformation energies obtained within the framework of a u
nified technique. In different versions of the calculation\, the deformati
on energies may differ\, but its correlations with the energy – remain.
In different versions of the calculation the deformation energies differ\
, but this leads only to a change in the scale along the energy axis\, and
don’t change the form of the correlation curve. Our estimations show\,
than determination of the unknown energies for superheavy nuclei from th
e correlation curve have the accuracy corresponding to the accuracy of the
discussed extrapolation curves. In [3] the microscopic variant of the Gro
dzins relation derived based on the geometrical collective model and a mic
roscopic approach to the description of excitation energies of the state
s for nuclei. In this case\, the starting point of the prediction is not
the deformation energy\, but the value of the deformation parameter. \nIn
this paper\, we consider several variants [4\, 5] of the deformation energ
y calculations. Obtained extrapolations are presented in two figures. At t
he first the deformation energies in accordance with [4] and two extrapola
tions are considered - without and taking into account nuclei with state
energies greater than 60 keV. The second figure shows the extrapolation a
ccording to the data from [5]. From the presented correlation curves\, the
estimations of the unknown energies of lowest states are obtained.\n\nhtt
ps://events.sinp.msu.ru/event/8/contributions/403/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/403/
END:VEVENT
BEGIN:VEVENT
SUMMARY:STUDY OF COULOMB BREAKUP OF 11BE WITHIN THE NON-PERTURBATIVE SEMI
CLASSICAL AND QUANTUM-QUASICLASSICAL TIME-DEPENDENT APPROACHES
DTSTART;VALUE=DATE-TIME:20220715T132000Z
DTEND;VALUE=DATE-TIME:20220715T134000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-410@events.sinp.msu.ru
DESCRIPTION:Speakers: Dinara Valiolda (KazNU/BLTP JINR)\nWe investigate th
e Coulomb breakup of 11Be halo nuclei on a heavy target\n(208Pb) from inte
rmediate (70 MeV/nucleon) to low energies (5 MeV/nucleon) within the non-p
erturbative semiclassical and quantum-quasiclassical time-dependent approa
ches. \nTo quantify how good the semiclassical approach with decreasing th
e projectile energy is\, we also performed calculations with quantum-quasi
classical approach\, which includes the effect of deformation of the proje
ctile trajectory and the transfer of energy from target to projectile and
vice versa \nduring a collision. We also analyse in the frame of this mode
l the influence of the 11Be resonant states 5/2+\, 3/2− and 3/2+ on the
breakup processes. This analysis demonstrates the possibility of studying
low-lying resonances in halo nuclei using their breakup reactions. The met
hod can potentially be useful for interpretation of low-energy breakup exp
eriments on different targets in studying the halo structure of nuclei.\n\
nhttps://events.sinp.msu.ru/event/8/contributions/410/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/410/
END:VEVENT
BEGIN:VEVENT
SUMMARY:UNION OF DISCRETIZED SPECTRA FOR SCATTERING CALCULATIONS
DTSTART;VALUE=DATE-TIME:20220715T074000Z
DTEND;VALUE=DATE-TIME:20220715T080000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-420@events.sinp.msu.ru
DESCRIPTION:Speakers: Vladimir Pomerantsev (Institute of nuclear physics\,
Moscow State University)\nSolving scattering problems in L2 bases is a pe
rspective way which allows to treat problems for continuum nearly on the s
ame footing as the discrete spectrum ones. Recently we have suggested a ne
w technique for reconstructing scattering amplitude directly from discreti
zed spectra of the total and asymptotic Hamiltonians found with variationa
l method [1]. It was shown also how the discretized spectra of the Hamilto
nians obtained using different bases of the same dimension can be united i
nto the common set. Apart other advantages\, such a union of discretized s
pectra (UDS) leads to a much denser grid for spectrum discretization witho
ut increasing an actual basis dimension. \nIn this study\, the technique b
ased on the UDS is generalized to multi-channel problems with degenerated
continuum. For practical calculations\, a non-orthogonal Gaussian basis is
used which is known to be very convenient for few-body bound-state proble
m. It is expected that it is for Gaussian basis sets that the UDS method w
ill be effective for calculations in few-body continuum\, as was shown for
the single-channel case [1]. As illustrations\, we consider the use of U
DS for solving two-body multi-channel scattering problems\, as well as for
finding multi-channel resonances. \n\n1. O.A. Rubtsova\, V.N. Pomerantsev
\, J. Phys. A 55\, 095301 (2022).\n\nhttps://events.sinp.msu.ru/event/8/co
ntributions/420/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/420/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SS-HORSE APPROACH: FURTHER DEVELOPMENT AND APPLICATION TO THE STUD
Y OF LIGHT NUCLEI
DTSTART;VALUE=DATE-TIME:20220715T080000Z
DTEND;VALUE=DATE-TIME:20220715T082000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-428@events.sinp.msu.ru
DESCRIPTION:Speakers: Alexander Mazur (Pacific National University)\nWe ha
ve proposed the SS-HORSE approach [1] which makes it possible to calculate
scattering phase shifts and S-matrix based on variational results in the
oscillator basis. Within SS-HORSE\, one can locate the S-matrix poles to o
btain resonance parameters [1] and improve the description of bound states
[2].\nWe discuss the results of our recent applications of the SS-HORSE a
pproach combined with the No-Core Shell Model (NCSM) to the studies of res
onant states in exotic light nuclei. In particular\, we present calculatio
ns of resonances in 7He nucleus with realistic NN interactions JISP16 [3]
and Daejeon16 [4]. The energies and widths of 7He resonances are calculate
d in the channels of elastic scattering of neutron by 6He nucleus in the g
round and first excited 2+ states. With Daejeon16 we obtain generally smal
ler or the same resonance energies and widths than with JISP16\; however\,
the results obtained with these NN interactions agree with each other and
with available experimental data on 〖3/2〗_1^-\, 1/2–\, and 5/2– r
esonances in 7He. We obtain also wide overlapping resonances 〖3/2〗_2^
-\, 3/2+\, and 5/2+ which make up an experimentally observed resonance of
unknown spin-parity at the energy of 6.2 MeV with the width of 4 MeV [5].\
nWe perform also NCSM calculations with Daejeon16 of the 9Li nucleus and u
se the SS-HORSE to improve description of its bound state energies and to
obtain asymptotic normalization coefficients in these states. The ground s
tate energy is well described while the excitation energy of the first exc
ited state is overestimated. Resonant 9Li states are examined in the chann
els of elastic scattering of neutrons by 8Li in the ground and first excit
ed states. We obtain 5/2–\, 3/2–\, and 7/2– resonances with energies
and widths in good correspondence with experimentally observed resonances
in 9Li which spin-parities are unknown.\n\n A. M. Shirokov\, A. I. Mazur\
, I. A. Mazur\, and J. P. Vary\, Phys. Rev. C 94\, 064320 (2016).\n A. M.
Shirokov\, A. I. Mazur\, V. A. Kulikov\, Phys. At. Nucl. 84\, 131 (2021).\
n A. M. Shirokov\, J. P. Vary\, A. I. Mazur\, and T. A. Weber\, Phys. Lett
. B 644\, 33 (2007).\n A. M. Shirokov\, I. J. Shin\, Y. Kim\, M. Sosonkina
\, P. Maris\, and J. P. Vary\, Phys. Lett. B 761\, 87 (2016).\n D. R. Till
ey et al.\, Nucl. Phys. A 708\, 3 (2002).\n\nhttps://events.sinp.msu.ru/ev
ent/8/contributions/428/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/428/
END:VEVENT
BEGIN:VEVENT
SUMMARY:NUCLEUS SURFACE TENSION AND ITS MICROSCOPIC RESONANCE DESCRIPTION
DTSTART;VALUE=DATE-TIME:20220714T130000Z
DTEND;VALUE=DATE-TIME:20220714T132000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-445@events.sinp.msu.ru
DESCRIPTION:Speakers: Aleksey Dolgodvorov (IBRAE)\nDeviations of nuclear p
roperties from shell model predictions are very sensitive to value of nucl
ear surface tension [1]. Although the quantitative estimation of these dev
iations is not yet possible\, a level of deviation is indicated by the val
ues of the nuclear surface tension coefficient σ. These deviations are mi
nimal for nuclei with high values of the coefficient σ. The nuclei of iro
n isotopes with even numbers of neutrons are characterized by relatively s
mall values of σ (see Fig. 1). The maximum value of σ for the 54Fe nucle
us is 9 times less than the surface tension of the 48Ca nucleus [1]. The c
alculation of resonant excited states of nuclei with small values of σ wi
thin the framework of the traditional many-particle shell model (MPSM) [2]
does not lead to an adequate description of the energy distribution of th
e excitation probabilities. Agreement with experiment can be achieved usin
g the method “particle-core coupling shell model” (PCCSM) [3]\, where
experimental values of spectroscopic factors are taken into account. For t
he 54Fe nucleus\, this method has led to a satisfactory theoretical descri
ption of the GDR [4]. The role of "magic numbers" in the formation of the
value of σ is shown in Fig. 1: the surface tension of the 54Fe nucleus is
more than 2 times higher than its values for other stable iron isotopes.
The influence of proton “magic numbers” is clearly seen from the compa
rison of Ni and Fe surface tension coefficients (Fig. 1).\n\n \nFig. 1. Va
lues of surface tension coefficients for Fe and Ni isotopes.\n\n1. N.G. Go
ncharova\, Physics of Particles and Nuclei 48\, 90 (2017).\n2. G.E. Brown\
, M. Bolsterly\, Phys. Rev. Lett. 3\, 472 (1959).\n3. N.G. Goncharova\, Ph
ys. Atom. Nucl. 72\, 1745 (2009).\n4. N.G. Goncharova\, A.P. Dolgodvorov\,
Phys.At.Nucl. 77\, 200 (2014).\n\nhttps://events.sinp.msu.ru/event/8/cont
ributions/445/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/445/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Experimental manifestation of the strong nuclear interaction in th
e optical spectra of solids
DTSTART;VALUE=DATE-TIME:20220712T103000Z
DTEND;VALUE=DATE-TIME:20220712T105000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-449@events.sinp.msu.ru
DESCRIPTION:Speakers: Vladimir Plekhanov (Fonoriton Sci. Lab.)\nExperiment
al manifestation of the strong nuclear interaction in the optical spectra
of solids\n V.G. Plekhanov\n Fonoriton Sci. Lab.\, Garon Ltd\, Talli
nn 11413\, Estonia\, vgplekhanov@gmail.com \n The primary task amongs
t other nuclear physics fundamental tasks is experimental measuring of nuc
lear force interacting between nucleons (protons and neutrons) and their d
ependence on nucleons' distance in between. The discovery of the neutron
by Chadwick in 1932 may be viewed as the birth of the strong nuclear inte
raction In 1935 Yukawa have tried to develop a theory of nuclear forces. T
he most important feature Yukawa^{'} forces is they have a small range (~1
0⁻¹⁵ m). However\, up to present time phenomenological Yukawa potenti
al can not be directly verified experimentally. We should remind that the
strong nuclear interaction - the heart of Quantum Chromodynamics (QCD) whi
ch is the part of the Standard Model (SM). According to SM the nuclear for
ce is a result of the strong force binding quarks to form protons and neut
rons [1]. Residual part of it holds protons and neutrons together to form
nuclei. There are common place in nuclear and high energy physics that th
e strong force does not act on leptons.\n Our report is devoted to stud
y the strong nuclear interaction via measuring the low - temperature (2 K)
photoluminescence spectra of LiH (Eg = 4.992 eV) (without strong interact
ion in hydrogen nucleus) and LiD (Eg = 5.095 eV) (with strong interaction
in deuterium nucleus) single crystals. \n The uniqueness of the LiH a
nd LiD compounds is that they differ in only one neutron\, i.e. lithium io
ns\, electron and proton are the same for them and\, therefore they have t
he same gravitational\, weak and electromagnetic interactions. The additio
ns of a neutron to hydrogen nucleus\, generates according to Yukawa\, a st
rong interaction between a proton and a neutron\, the effect on which on e
lectron is manifested in the isotope shift (0.103 eV) of the zero - phonon
photoluminescence line of free excitons in LiD crystals (see Fig 1 in Ref
.2.). The experimental observation of isotope shift (0.103 eV) of the phon
onless free exciton emission line in LiD crystals is a direct manifestatio
n of the long - range nuclear strong interactions on the leptons [3]. Mor
eover\, we have measured the dependence of the nuclear strong force on the
distance between nucleons in deuterium nucleus.\n 1. D.H. Perkins\, In
troduction to High Energy Physics (CUP\, Cambridge\, 2000).\n 2. V.G. P
lekhanov\, Phys. - Usp. 62\, 947 (2019)\n 3. V.G. Plekhanov\, Atomic En
ergy 131\, 123 (1921) (in Russian).\n\nhttps://events.sinp.msu.ru/event/8/
contributions/449/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/449/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Influence of nuclear surface diffuseness on halo structure of Zr i
sotopes near the neutron drip line
DTSTART;VALUE=DATE-TIME:20220714T143500Z
DTEND;VALUE=DATE-TIME:20220714T145500Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-453@events.sinp.msu.ru
DESCRIPTION:Speakers: Olga Bespalova ()\nMore pronounced increase in the n
eutron surface diffuseness with increasing of neutron excess is expected f
or the nuclei far from the β-stability valley [1\,2] in comparison with t
he stable ones. Earlier\, the halo and giant halo were predicted for the Z
r isotopes near the neutron drip line by the relativistic Hartree-Bogoliub
ov theory [3]. We studied the halo structure of these isotopes within the
dispersive optical model. Influence of the diffuseness parameters of the v
olume and surface components of the dispersive optical model potential on
the root-mean-square radii of Zr isotopes and its halo states\, and their
population was investigated. The influence of the increase in the diffusen
ess *aHF* of the Hartree-Fock component\, for example\, was appeared to be
double: root-mean-square radius *rnlj* of 3p halo states decreased\, but
the number of neutrons *nnlj* in these states increased (see Fig. 1 ![ente
r image description here][1]). It was shown also that the number of neutro
ns in halo states differed significantly from the number of neutrons in th
e halo region where there was no spatial correlation of neutrons in halo s
tates with the core of the nucleus. \n\nFig. 1. Single-particle energy Enl
j(left)\, root-mean-square radius rnlj (middle) and number of neutrons nnl
j in the single-particle states near the Fermi energy (right) in 130Zr.\n\
n1. G. A. Lalazissis\, D. Vretenar\, W. Pöschl\, E. Ring. Nucl. Phys. A 6
32\, 363 (1998).\n2. Ning Wang\, Min Liu\, Xizhen Wu\, Jie Meng. Phys. Let
t. B 734\, 215 (2014).\n3. J. Meng\, P. Ring. Phys. Rev. Lett. 80\, 460 (1
998).\n\n\n [1]: https://disk.yandex.ru/i/mToRRm0O8le9Dw\n\nhttps://event
s.sinp.msu.ru/event/8/contributions/453/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/453/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Detailed study of radioactive decay properties of nobelium isotope
s with α\, β\, γ-spectroscopy method
DTSTART;VALUE=DATE-TIME:20220712T072000Z
DTEND;VALUE=DATE-TIME:20220712T074000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-459@events.sinp.msu.ru
DESCRIPTION:Speakers: Mereigul Tezekbayeva (Joint Institute for Nuclear Re
searches\, Flerov Laboratory of Nuclear Reactions)\nAt FLNR JINR\, experim
ents are aimed to investigate the radioactive decay properties ($\\alpha$\
, $\\beta$\, $\\gamma$-spectroscopy) and the cross sections measurements o
f transfermium elements\, synthesized in complete fusion reaction of accel
erated heavy ion beam with target nuclei\, with subsequent evaporation of
several light particles at the kinematic separator SHELS [1\,2]. A number
of experiments were devoted to the study of the radioactive decay properti
es of Nobelium isotopes are produced as an evaporation result of two or th
ree neutrons by a compound nucleus in the reaction of $^{48}$Ca beam with
$^{204\,206\,208}$Pb targets. These Nobelium isotopes have sufficiently hi
gh production cross-sections\, which allow us collect good statistics for
studying decay properties by methods of alpha\, beta\, gamma spectroscopy.
Nobelium isotopes are interesting in how the radioactive decay properties
change passing through the closed subshell N = 152\, thereby could be obt
ain data are necessary to understanding how the heavy elements properties
behave passing through the subshell N = 162.\n\n1. A. V. Yeremin\, et al.\
, Phys. Part. Nucl. Lett. 12\, 43 (2015).\n2. A. V. Yeremin\, et al.\, Phy
s. Part. Nucl. Lett. 12\, 35 (2015).\n\nhttps://events.sinp.msu.ru/event/8
/contributions/459/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/459/
END:VEVENT
BEGIN:VEVENT
SUMMARY:INFLUENCE OF NUCLEON PAIRS ON THE NUCLEAR SURFACE TENSION
DTSTART;VALUE=DATE-TIME:20220714T132000Z
DTEND;VALUE=DATE-TIME:20220714T134000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-464@events.sinp.msu.ru
DESCRIPTION:Speakers: Natalia Goncharova (MSU)\nThe calculation of the sur
face tension coefficients σ of even-even nuclei [1] showed the decisive r
ole of shell effects in the formation of the value of σ. The addition of
neutron pairs to the "magic" nucleus leads\, as a rule\, to a decrease in
σ (Fig. 1). Low values of σ change little upon addition of neutron pairs
until a neutron-closed subshell is obtained\, when the surface tension sh
arply increases (Fig.1a).\n \nFig.1a. Surface tension of Ca\, Ar and Ti nu
clei Fig.1b. Surface tension of C and O
\nThe role of proton pairs in the formatio
n of surface tension is more controversial. Adding a pair of protons to a
closed protons shell leads to a significant decrease in σ [σ(18O)/σ(20N
e)≈4.5\; σ(48Ca)/σ(50Ti)≈5.5]. The surface tension of the nucleus\,
as a rule\, increases if the addition of a pair of protons completes the s
hell to closeness [σ(40Ca)/σ(38Ar)≈3.3\;]\, however\, the addition of
a pair of protons to the 14C nucleus leads to a decrease in σ (Fig. 1b)\,
although in this case a closed proton subshell is formed. The relatively
low value of σ for the 16O nucleus is the source of the formation of a co
mplex structure of giant resonance in this nucleus\, which has not been ad
equately explained in terms of the many-particle shell model [2\,3]. The i
nfluence of the shell structure on the surface tension of heavy stable nuc
lei is clearly manifested in mercury and lead isotopes: the surface tensio
n coefficient σ more than triples when a pair of protons (3s)2 is added t
o the 204Hg nucleus and the "magic" number of protons 82 is formed. Comple
ting the construction of the lead’s neutron shell up to N=126 leads to a
n even sharper increase in σ and the achievement of the maximum of this c
oefficient among all nuclei: σ(126Pb)≈34MeV/fm2.\n\n1. N.G. Goncharova\
, Phys. Part. Nucl. 50\, 532 (2019).\n2. G.E. Brown\, M. Bolsterly\, Phys.
Rev. Lett. 3\, 472 (1959). \n3. N.G. Goncharova\, Phys. At. Nucl. 85\,75
(2022).\n\nhttps://events.sinp.msu.ru/event/8/contributions/464/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/464/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The multiplicity of neutrons of spontaneous fission of 250No obtai
ned in complete fusion reactions with heavy ions at the SHELS separator.
DTSTART;VALUE=DATE-TIME:20220712T074000Z
DTEND;VALUE=DATE-TIME:20220712T080000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-463@events.sinp.msu.ru
DESCRIPTION:Speakers: Bekzat Sailaubekov (Joint Institute for Nuclear Rese
arch\, Dubna\, Russia)\nFor more than 20 years\, experiments on the synthe
sis and study of the properties of radioactive decay of short-lived isotop
es of transuranic elements have been conducted at the Flerov Nuclear React
ions Laboratory of JINR. The reactions of complete fusion of accelerated m
ulticharged ions with target nuclei heavier than lead were mainly used. In
these experiments\, experimental installations with kinematic separation
of recoil nuclei from background products are most often used. In these in
stallations (separators)\, the separation in space of recoil nuclei\, inco
ming ions and products of multi-nucleon transfer reactions occurs in elect
ric and magnetic fields due to the difference in their trajectories caused
by the difference in their ionic charge and energy (velocity) distributio
ns.\nThis work describes the kinematic separator SHELS [1]\, which is used
for the synthesis and study of the properties of heavy nuclei. A separato
r detection system consisting of a time-of-flight system\, a focal semicon
ductor detector and a SFiNx detection system is described [2]. The new det
ection system consists of an assembly of multi-strip two-sided Si detector
s\, around which 116 proportional neutron counters filled with 3He are pla
ced. The detector system was used in the experiment to study the character
istics of spontaneous fission of the isotope 250No\, in which data on the
yields of neutrons of spontaneous fission were compared with previously pu
blished results. \nPreliminary data were obtained during processing. The n
eutron detection efficiency was (54.7 ± 0.1)%. The measured average numbe
r of neutrons in the 250No fission act was (2.32 ± 0.07)\, which\, taking
into account the efficiency of the neutron detector\, gives the value of
the average number of neutrons ν = (4.24 ± 0.13).\n\n1. Popeko A.G.\, Ye
remin A.V.\, Malyshev O.N.\, Chepigin V.I.\, Isaev A.V.\, Popov Yu.A.\, Sv
irikhin A.I.\, Haushild K.\, Lopez-Martens A.\, Rezynkina K.\, Dorvaux O.
Separator for Heavy ELement Spectroscopy – velocity filter SHELS. // Nuc
l. Instrum. Methods Phys. Res. B. 2016. 376. P. 140–143.\n2. A.V. Isaev
et al. The SFiNx Detector System. // Physics of Particles and Nuclei Lette
rs 19.1 (2022)\, pp. 37–45.\n\nhttps://events.sinp.msu.ru/event/8/contri
butions/463/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/463/
END:VEVENT
BEGIN:VEVENT
SUMMARY:PROPERTIES OF GAMOW-TELLER AND CHARGE-EXCHANGE GIANT SPIN-MONOPOLE
RESONANCES IN MEDIUM-HEAVY CLOSED-SHELL PARENT NUCLEI: A SEMIMICROSCOPIC
DESCRIPTION
DTSTART;VALUE=DATE-TIME:20220714T124000Z
DTEND;VALUE=DATE-TIME:20220714T130000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-469@events.sinp.msu.ru
DESCRIPTION:Speakers: Vladimir Bondarenko (Shubnikov Institute of Crystall
ography\, Federal Research Center “Crystallography and Photonics\,” Ru
ssian Academy of Sciences\, Moscow\, Russia)\nProperties of giant resonanc
es (GRs) associated with high-energy particle-hole (p-h) excitations in me
dium-heavy nuclei are described by a number of characteristics and paramet
ers. Main characteristics include the energy-averaged strength function an
d “projected” transition density\, both related to an appropriated sin
gle-particle external field (probing operator)\, and strength functions of
direct one-nucleon decay. Being considered in a wide excitation-energy in
tervals\, these characteristics determine\, in particular\, the GR peak en
ergy\, fractions of the respective sum rule\, probabilities of direct one-
nucleon decay. \nIn this work\, we present a theoretical study of the main
properties of Gamow-Teller and charge-exchange (isovector) giant spin-mon
opole resonances (GTR and $IVGSMR^{(∓)}$\, respectively) in a few medium
-heavy closed-shell parent nuclei. The study is performed within the semi-
microscopic p-h dispersive optical model (PHDOM)\, in which the main relax
ation modes of p-h states associated with GRs are together taken into acco
unt. Actually\, PHDOM is a microscopically-based extension of the standard
and nonstandard versions of the continuum-random-phase-approximation on t
aking (phenomenologically and in average over the energy) the spreading ef
fect into account. Formulation of PHDOM and its implementations to describ
ing a few of isoscalar and isovector GRs in medium-heavy closed-shell nucl
ei can be found in Ref. [1] and references therein. Within the model. a re
alistic partially self-consistent phenomenological mean field and Landau-M
igdal p-h interaction are used as input quantities.\nIn this work\, PHDOM
is adopted and then implemented to describing main properties of GTR and $
IVGSMR^{(∓)}$ in the $^{48}Ca$\, $^{90}Zr$\, $^{132}Sn$\, and $^{208}Pb$
parent nuclei. Calculation results are compared with available experiment
al data. Most of the results can be found in Ref [2].\n\n \n\n 1. M.L. Gor
elik\, S. Shlomo\, B.A. Tulupov\, and M.H. Urin\, Phys. Rev. C103\, 034302
(2021).\n \n 2. V.I. Bondarenko\, M.H.Urin\, http://arxiv.org/abs/2201.02
965.\n\nhttps://events.sinp.msu.ru/event/8/contributions/469/
LOCATION: Физический ф-т\, 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/469/
END:VEVENT
BEGIN:VEVENT
SUMMARY:NATURAL WIDTHS OF ATOMIC LEVELS IN THORIUM DETERMINED BY THE ICES
METHOD
DTSTART;VALUE=DATE-TIME:20220712T143000Z
DTEND;VALUE=DATE-TIME:20220712T145000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-480@events.sinp.msu.ru
DESCRIPTION:Speakers: Anvar Inoyatov (Joint Institute for Nuclear Research
\, Dubna)\nThe overwhelming majority of the experimental atomic-level widt
hs in thorium (see\, e.g.\, the compilation [1]) were determined by the X-
ray emission spectroscopy and only several N-subshell values were obtained
by the XPS method. There are no available relevant experimental data dete
rmined by another methods. Therefore\, we used suitable conversion electro
n lines of the 9.2\, 15.1 and 24.3 keV nuclear transitions in 227Th (gener
ated in the ꞵ ̶ decay of 227Ac) measured in the works [2\,3] for the d
etermination of the M1\, M2\, M3\, N1\, N2\, and N3 atomic-level widths us
ing the approach and the computer code [4]. The values obtained are given
in the table (in eV). \n\n Atomic subshell\n M1 M2 M3 N1 N2 N3\nThis work
14.1±0.5 11.4±0.5 6.9±0.4 11.4±1.4 8.6±1.2 6.0±0.7\nRef. [1] 15.5±2
.0 13.2±(5÷25)% 8±(5÷25)% 11.5±(10%) 8.8±0.8 7.5±1.0\n\nAs can be s
een\, the agreement within 2σ (or better) is found between the present an
d compilated data [1] and for the most of the atomic subshells in question
our values are more precise. Thus\, our data represent a valuable contrib
ution to the database of the experimental natural atomic-level widths of t
horium.\n\n[1] J.L. Campbell\, T. Papp\, Atom. Data Nucl. Data Tables\, 7
7 (2001) 1.\n[2] A. Kovalík et al.\, Eur. Phys. J. A\, 55 (2019) 131.\n[3
] A. Kovalík et al.\, Eur. Phys. J. A\, 57 (2021) 285.\n[4] A. Inoyatov
et al.\, J. Elect. Spec. Relat. Phenom.\, 160 (2007) 54.\n\nhttps://events
.sinp.msu.ru/event/8/contributions/480/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/480/
END:VEVENT
BEGIN:VEVENT
SUMMARY:LITHIUM-10 AS BORROMEAN NUCLEUS SUBSYSTEM
DTSTART;VALUE=DATE-TIME:20220715T130000Z
DTEND;VALUE=DATE-TIME:20220715T132000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-499@events.sinp.msu.ru
DESCRIPTION:Speakers: Pavel Sharov (JINR)\nThe Borromean system have a wid
e spread near nuclear driplines. These systems are of strong interest for
theoretical and experimental studies because of their exotic properties\,
such as strong nuclear matter asymmetry and anomalous nuclear density (ha
lo effect).\nThe cluster three body models usually provide good descriptio
n of the borromean nuclei structure. In particular\, three-body model rep
roduce nuclear halo effect and anomalous matter radius for bound states of
borromean nuclei and partial width for two-proton / two-neutron decays fo
r continuum states. Obviously\, cluster models require accurate treatment
of interaction between clusters. When one have reasonable description fo
r nucleon-nucleon interaction\, treatment of interaction of the core (whic
h is also dripline nucleus) with nucleon is complex problem.\nOn example o
f nuclear system 10Li and 11Li two quite general problems will be discusse
d: how structure of borromean system connected with structure of it binary
subsystems\; and how interaction in binary subsystems can be experimental
ly studied.\n\nhttps://events.sinp.msu.ru/event/8/contributions/499/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/499/
END:VEVENT
BEGIN:VEVENT
SUMMARY:THE HALF-LIFE OF 229mTh ISOMERS IN ACID SOLUTION
DTSTART;VALUE=DATE-TIME:20220712T141000Z
DTEND;VALUE=DATE-TIME:20220712T143000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-494@events.sinp.msu.ru
DESCRIPTION:Speakers: Vladimir Koltsov (Khlopin Radium Institute\, Saint-P
etersburg\, Russian Federation)\nThe 229mTh isomeric state with an energy
of about 8 eV is formed in 2% of the cases of 233U α-decay (see ref. [1]
and references therein). For neutral 229mTh atoms\, the main decay channel
is nonradiative – it is either electronic conversion or decay via an el
ectronic bridge. An estimate of the probability of a decay with photon emi
ssion γTh gives a half-life T1/2 ≈ 2 h and is much smaller than the pro
bability of a nonradiative transition. Photons can only be observed for 22
9mTh ions when the nonradiative channel is closed.\nHere we give a detaile
d analysis of work [2]\, where γTh photons were observed for 4+ ions of 2
29mTh in HCl acid solution obtained in an ion exchange column from 0.1 g U
(the relative α-activities of 233U and 232U were 99.8% and 0.02%\, respe
ctively). In each of several experiments four samples were sequentially pr
epared with 229mTh in 7M HCl aqueous solution by eluting once an hour fres
h Th from U\, which was previously purified from Th and its daughters. Sou
rces for \nα-spectrometry were prepared from the second and third samples
\; for each of them the α-activity of Th daughters increased with time. T
hus\, the α-activity of the samples could not lead to their damped photon
emission.\nThe first and fourth liquid samples of 229mTh were placed into
thin-layer quartz cuvettes\, and t = 60 min after Th elution\, the photon
counting intensity N(t) from the samples was measured by a photomultiplie
r with a Sb-Na-K-CS photocathode\, the photo efficiency was about 1% in th
e wavelength range of 300 – 800 nm. The time dependence of N(t) averaged
over all experiments was approximated as \, where A = 9 3\, T1 = 22
3 min\, T2 = 290 50 min (errors are one standard deviation). N0 wa
s proportional to the -activity of 229Th in the samples with an accurac
y of 20% and did not correlate with their total -activity. It can be as
sumed that for the 229mTh isomer in an HCl solution\, T1/2 is in the range
of 20 – 400 min. To refine T1/2 and the isomeric transition energy\, it
is necessary to study the photon spectrum of such samples.\n\n1. B.S. Nic
kerson\, M. Pimon\, P.V. Bilous et al.// PRA. 103\, 053120 (2021).\n2. V.V
. Koltsov\, T.E. Kuzmina\, D.N. Suglobov. Half-life measurement of the 229
Th isomer. Proc. Int. Conf. on Nucl\, Phys.\, Moscow\, June 16–19\, P. 2
66 (1999).\n\nhttps://events.sinp.msu.ru/event/8/contributions/494/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/494/
END:VEVENT
BEGIN:VEVENT
SUMMARY:CONTRIBUTION OF INDUCED DIPOLE INTERACTION TO THE ASYMPTOTIC BEHA
VIOR OF WAVE FUNCTION COMPONENTS FOR THE SCATTERING IN THREE BODY COULOMB
SYSTEMS
DTSTART;VALUE=DATE-TIME:20220715T082000Z
DTEND;VALUE=DATE-TIME:20220715T084000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-513@events.sinp.msu.ru
DESCRIPTION:Speakers: Sergey Yakovlev (SPbGU)\nCONTRIBUTION OF INDUCED DI
POLE INTERACTION TO THE ASYMPTOTIC BEHAVIOR OF WAVE FUNCTION COMPONENTS FO
R THE SCATTERING IN THREE BODY COULOMB SYSTEMS\n\nV.A. Gradusov1\, S.L. Ya
kovlev1\n1St Petersburg State University\, St Petersburg\, Russia\; \n E-m
ail: s.yakovlev@spbu.ru\n \nWe consider the scattering of a charged partic
le with a two-particle target system which is bound by the attractive Coul
omb interaction. The Faddeev-Merkuriev set of equations is used for descri
bing the scattering process [1\,2]. Although\, the leading contribution to
the asymptotic form of the wave function and its components comes from t
he asymptotic Coulomb interaction between the two-particle target and the
spectator particle\, the next long-range terms of the multipole expansion
of this interaction play important role in energy region where the excited
state channels are open [3]. In this contribution we derive the explicit
asymptotic representations for the wave function components which take int
o account as the Coulomb as well as the induced dipole interactions betwee
n the two-body target and the spectator particle. The general method from
[4] is used for constructing asymptotic solutions. The derived asymptotics
is then intended for the use in electron and positron scattering off the
hydrogen atom and helium cation calculations in the energy regions above
the thresholds of exited states of the targets where the induced dipole i
nteraction produces specific effects in scattering data [4].
\n\n\n\n1. L.D. Faddeev and S.P. Merkuriev\, Quantum Scattering Theor
y for Several Particle Systems\, Kluwer\, Dordrecht (1993).\n2. V.A. Gradu
sov et al.\, JETP Letters 114\, No. 1\, 11 (2021)\n3. M. Gailitis\, J. Phy
s. B: Atom. Mol. Phys. 9\, 843 (1976).\n4. S.L. Yakovlev\, Theor. Math. Ph
ys. 203 (2)\, 664 (2020).\n5. V.A. Gradusov et al.\, J. Phys. B: At. Mol.
Opt. Phys. 52\, 055202 (2019).\n\nhttps://events.sinp.msu.ru/event/8/contr
ibutions/513/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/513/
END:VEVENT
BEGIN:VEVENT
SUMMARY:STUDY OF EXCITED STATES IN ATOMIC NUCLEI 46Ti AND 45Ti IN REACTION
S WITH 3He BEAM AT 29 MeV
DTSTART;VALUE=DATE-TIME:20220712T095000Z
DTEND;VALUE=DATE-TIME:20220712T101000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-515@events.sinp.msu.ru
DESCRIPTION:Speakers: Nikolay Skobelev ()\nThe results of measurements of
the angular distributions of deuterons in the 45Sc(3He\, d)46Ti reaction a
re presented\, from which the cross sections for population of the ground
and excited states in the 46Ti nucleus were determined [1]. The energy of
the bombarding 3He particles was 29 MeV.\nThe measured angular distributi
ons for the excited states in the 46Ti nuclei are compared with the result
s of other measurements at several values of 3He energy. A comparison of t
he angular distributions for the ground and excited states of 46Ti with DW
BA calculations showed that the pickup of a proton from 3He to the target
nucleus mainly results in transfer of 3 or 1 units of angular momentum\, w
hich corresponds to the population of 1f7/2 and 2p3/2 shells\, respectivel
y. It was shown that rearrangement of nucleons in the unfilled 1f7/2 and 2
p3/2 shells leads to excitation of both collective and particle-hole state
s with different angular momenta. The energy spectra of 46Ti obtained in t
he experiment were analyzed within the framework of the dinuclear system m
odel [2]. \nFor the 45Sc(3He\, t)45Ti reaction\, the spectrum of excited s
tates of 45Ti was measured for the first time [3]. Significantly fewer ex
cited states in the resulting 45Ti nucleus are populated compared to 46Ti\
; moreover\, mainly low-lying single-particle states are populated.\nThe e
xperiments were carried out at the accelerator of the Institute of Nuclear
Physics\, Řež\, Czech Republic.\n1. N. K. Skobelev\, Yu. E. Penionzhkev
ich\, V. Burjan\, and J. Mrázek\, Bulletin of the Russian Academy of Scie
nces: Physics 84\, 425 (2020).\n2. T.M.Shneidman\, G.G.Adamian\, N.V.Anton
enko\, R.V.Jolos\, S.-G.Zhou\, Phys.Rev. C 92\, 034302 (2015).\n3. N. K. S
kobelev\, Yu. E. Penionzhkevich\, I. Siváček\, T. Issatayev et al.\, Phy
sics of Particles and Nuclei 53\, 382 (2022).\n\nhttps://events.sinp.msu.r
u/event/8/contributions/515/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/515/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of the 242Pu + 48Ca and 238U + 48Ca reactions at DGFRS-II
DTSTART;VALUE=DATE-TIME:20220712T082000Z
DTEND;VALUE=DATE-TIME:20220712T084000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-533@events.sinp.msu.ru
DESCRIPTION:Speakers: Dastan Ibadullayev (1. FLNR\, JINR. 2. Institute of
Nuclear Physics\, Almaty)\nThis work presents the results of the experime
nts performed at the FLNR\, JINR Superheavy Element Factory (SHE Factory).
The experiments were carried out on the basis of the new cyclotron DC-280
with an intensity of accelerated particles of up to 10 pµA [1] and gas f
illed separator DGFRS-2 [2] and were aimed at study of the $^{242}$Pu+$^{4
8}$Ca and $^{238}$U+$^{48}$Ca reactions. The main goal of this experiments
consisted in determining the capabilities of the SHE Factory for the prod
uction and study of new isotopes of known superheavy elements up to Og(Z=1
18)\, as well as the synthesis of new ones with Z>118.\nThe decay properti
es of $^{286}$Fl and $^{287}$Fl\, as well as their α-decay products\, hav
e been updated from 25 and 69 new decay chains\, respectively. Additionall
y\, 16 decay chains of $^{283}$Cn were observed in the $^{238}$U+$^{48}$Ca
reaction. During the experiment\, the maximum intensity of the $^{48}$Ca
ion beam was 6.5 pµA. The stability of the target was measured at such hi
gh intensities. Possibility of existing of isomeric states in the $^{287}$
Fl consecutive α decays is discussed. A new α line with energy of 100-20
0 keV lower than the main one at 10.19 MeV was observed for the first time
for even-even $^{286}$Fl. The maximum cross section of 10.4$^{+3.5}_{-2.1
}$) pb was measured for the $^{242}$Pu($^{48}$Ca\,3n)$^{287}$Fl reaction.\
n\n1. G.G. Gulbekian S.N. Dmitriev\, M.G. Itkis\, Yu.Ts. Oganessyan\, B.N.
Gikal et. al. Start-Up of the DC-280 Cyclotron\, the Basic Facility of th
e Factory of Superheavy Elements of the Laboratory of Nuclear Reactions at
the Joint Institute for Nuclear Research. // Phys. Part. Nucl. Lett. 16\,
866 (2019).\n2. Yu.Ts. Oganessian\, V.K. Utyonkov et al. DGFRS-2 - a gas-
filled recoil separator for the Dubna Superheavy Element Factory. // Nucle
ar Instruments and Methods in Physics Research (submitted).\n\nhttps://eve
nts.sinp.msu.ru/event/8/contributions/533/
LOCATION: Физический факультет\, ауд. 5-19
URL:https://events.sinp.msu.ru/event/8/contributions/533/
END:VEVENT
BEGIN:VEVENT
SUMMARY:BOSE-HUBBARD MODELS WITH ON-SITE AND NEAREST-NEIGHBOR INTERACTIONS
: EXACTLY SOLVABLE CASE
DTSTART;VALUE=DATE-TIME:20220715T091000Z
DTEND;VALUE=DATE-TIME:20220715T093000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-544@events.sinp.msu.ru
DESCRIPTION:Speakers: Saidakhmat Lakaev ()\nWe study the discrete spectrum
of the two-particle Schrodinger operator depending on the quasi-momentum
associated to the Bose-Hubbard Hamiltonian of a system of two identical bo
sons interacting on one site and nearest-neighbor sites in the two-dimensi
onal lattice with arbitrary interaction magnitudes. We completely describe
the spectrum of Schrodinger operator with zero quasi-momentum and establi
sh the optimal lower bound for the number of eigenvalues of Schrodinger op
erator outside its essential spectrum for all non-zero values of quasi-mom
entum.\n\nhttps://events.sinp.msu.ru/event/8/contributions/544/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/544/
END:VEVENT
BEGIN:VEVENT
SUMMARY:MINLOS-FADDEEV REGULARIZATION OF ZERO-RANGE INTERACTIONS IN THE TH
REE-BODY PROBLEM
DTSTART;VALUE=DATE-TIME:20220715T093000Z
DTEND;VALUE=DATE-TIME:20220715T095000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-557@events.sinp.msu.ru
DESCRIPTION:Speakers: Anastasia Malykh (Joint Institute for Nuclear Resear
ch\, Dubna)\nApplication of zero-range two-body interactions in the three-
body problem is not a trivial task\, which manifests in appearance of Efim
ov or Thomas effects. One particular modification of zero-range interactio
ns was suggested in the influential paper by Minlos and Faddeev [1] and wa
s further analyzed in [2]. A main idea is to regularize the three-body pro
blem by adding the effective three-body force\, which reduces the interact
ion strength near the triple-collision point. As a result\, the Efimov and
Thomas effects are prohibited if the strength of regularizing term s exce
eds the critical value $\\sigma_c$. Recently\, it was claimed that the con
dition $\\sigma \\ge \\sigma_c$ provides the unambiguous description of th
e problem for three identical bosons [3] and for N identical bosons intera
cting with a distinct particle [4]. \n\nThe proposed modification is studi
ed and it is shown that to regularize the three-body problem\, the paramet
er s should exceed another critical value $\\sigma_r > \\sigma_c$. More d
etailed analysis is given for the interval $\\sigma_c \\le \\sigma < \\sig
ma_r$\, for which unambiguous description requires one to set a boundary c
ondition at the triple-collision point. \nThese considerations are explici
tly demonstrated for two-component system consisting of two identical boso
ns interacting with a distinct particle and for three identical bosons. To
elucidate the description\, the bound-state energies of three identical b
osons are calculated as a function of s and an additional parameter $b$\,
which determines the boundary condition. \n\n1. R.A. Minlos and L.D. Fadde
ev\, Dokl. Akad. Nauk SSSR 141\, 1335 (1961)\n [Sov. Phys. Doklady 141
\, 1335 (1962)].\n2. S. Albeverio\, et.al.\, Phys. Lett. A 83\, 105 (1981)
.\n3. Giulia Basti\, et.al.\, arXiv:2107.07188 [math-ph] (2021).\n4. D. Fe
rretti and A. Teta\, arXiv:2202.12765 [math-ph] (2022).\n\nhttps://events.
sinp.msu.ru/event/8/contributions/557/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/557/
END:VEVENT
BEGIN:VEVENT
SUMMARY:ABSENCE OF THE THREE-BODY BOUND STATES FOR SMALL MASS RATIO IN THE
TWO-COMPONENT SYSTEM
DTSTART;VALUE=DATE-TIME:20220715T095000Z
DTEND;VALUE=DATE-TIME:20220715T101000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-560@events.sinp.msu.ru
DESCRIPTION:Speakers: Oleg Kartavtsev (Joint Institute for Nuclear Researc
h\, Dubna)\nIt is of interest to determine the mass-ratio\, below which th
ere are no bound states\, for two-component system of two identical partic
les interacting with a distinct particle via contact interaction. Using th
e hyperradial expansion and taking into account that interaction is of zer
o range\, the two-variable inequality was derived\, which provides absence
of bound states. The variable are mass ratio and the lowest eigenvalue of
an auxiliary eigenvalue problem on hyper-sphere. This inequality is analy
zed for different sectors of total angular momentum and parity. As a resul
t\, desired values of the mass ratio for few lowest angular momenta are ob
tained. Till now\, this problem was considered for the sector of unit tota
l angular momentum and negative parity by analysing momentum-space integra
l equation [1]. \n\n1 S. Becker\, A. Michelangeli and A. Ottolini\, Math.
Phys. Anal. Geom 21\, 35 (2018).\n\nhttps://events.sinp.msu.ru/event/8/con
tributions/560/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/560/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The reprojection method for inelastic collision processes
DTSTART;VALUE=DATE-TIME:20220715T124000Z
DTEND;VALUE=DATE-TIME:20220715T130000Z
DTSTAMP;VALUE=DATE-TIME:20241102T174616Z
UID:indico-contribution-33-575@events.sinp.msu.ru
DESCRIPTION:Speakers: Andrey Belyaev (Herzen University)\nThe standard Bor
n-Oppenheimer approach to theoretical treatments of inelastic collision pr
ocesses is the most widely used approach\, despite many other methods have
been proposed as well. It solves the problems into two steps: (1) the ele
ctronic structure calculations for fixed nuclei\, and (2) nonadiabatic nuc
lear dynamical studies based on the potentials and couplings computed at t
he first step. Various quantum methods have been developed for the both st
eps and applied to a large variety of collisional partners (atoms\, ions\,
molecules\, clusters\, etc) and to a huge number of physical processes.
The approach looks to be well developed and reliable. \nHowever\, the deta
iled analysis shows that the conventional applications of the Born-Oppenhe
imer approach encounter severe problems. They are: ambiguity of nonadiabat
ic couplings and coupled channel equations\, nonvanishing asymptotic nonad
iabatic couplings\, divergence of state-to-state transition probabilities
and cross sections with respect to some parameters of problems\, to mentio
n a few. The most severe is probably nonzero asymptotic couplings. In the
past\, these and other problems have been ignored as being negligible\, an
d final results (transition probabilities\, cross sections\, rate coeffici
ents) were assumed to have low error bars\, since usual practical calculat
ions were performed with a number of approximations. The development of mo
dern computer facilities and soft wear allow one to increase accuracy of c
alculations. Nevertheless\, Ref. [1] shown that attempts to extend paramet
ers of calculations within the conventional application of the Born-Oppenh
eimer approach result in divergence instead of expected convergence\, and
the results have no sense.\nThe reprojection method [1-3] within the stand
ard Born-Oppenheimer approach solves the problems. It treats the nonadiaba
tic nuclear dynamics with nonzero asymptotic nonadiabatic coupligs\, as th
ey come from ab initio electronic structure calculations. In addition\, th
e method distinguishes interatomic and internuclear distances\, as well as
the scattering channels and molecular states. It turns out that the nonze
ro asymptotic couplings are responsible for correct asymptotic wave functi
ons. Moreover\, Ref. [4] shows that the correct asymptotic wave functions
can be constructed from the coupled asymptotic solutions of the dynamical
equations.\n\n1. A. K. Belyaev\, Phys. Rev. A 82\, 060701 (2010).\n2. J. G
rosser\, T. Menzel\, and A. K. Belyaev\, Phys. Rev. A. 59\, 1309 (1999).\n
3. A. K. Belyaev\, D. Egorova\, J. Grosser\, and T. Menzel\, Phys. Rev. A
64\, 052701 (2001).\n4. С. Л. Яковлев\, Е. А. Яревский\
, Н. Эландер и А. К. Беляев\, ТиМФ 195\, 437 (2018).\
n\nhttps://events.sinp.msu.ru/event/8/contributions/575/
LOCATION: Физический ф-т\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/575/
END:VEVENT
END:VCALENDAR