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SUMMARY:ACCELERATOR BASED NEUTRON SOURCE VITA
DTSTART;VALUE=DATE-TIME:20220713T151000Z
DTEND;VALUE=DATE-TIME:20220713T153000Z
DTSTAMP;VALUE=DATE-TIME:20260308T033721Z
UID:indico-contribution-39-225@events.sinp.msu.ru
DESCRIPTION:Speakers: Sergey Taskaev (Budker Institute of Nuclear Physics)
 \nA compact accelerator-based neutron source VITA has been proposed and cr
 eated at the Budker Institute of Nuclear Physics in Novosibirsk\, Russia. 
 The source comprises an original design tandem accelerator\, solid lithium
  target\, and a neutron beam shaping assembly. At present\, the facility p
 rovides the production of protons or deuterons\, the formation of neutron 
 fluxes of almost any energy range: cold\, thermal\, epithermal\, over-epit
 hermal\, monoenergetic or fast\, as well as the generation of 478 keV\, 51
 1 keV or 9.17 MeV photons\, -particles and positrons. \nDeveloped facil
 ity became a prototype of neutron sources for the boron neutron capture th
 erapy clinics. The first commercial neutron source is installed at the Xia
 men Humanity Hospital in China. The next two neutron sources are made for 
 National Oncological Hadron Therapy Center in Pavia (Italy) and for Nation
 al Medical Research Center of Oncology in Moscow (Russia).\nThe facility i
 s used for the development of the boron neutron capture therapy technique\
 , namely: i) to study the effect of neutron radiation on cell cultures and
  laboratory animals\, ii) to treat large pets with spontaneous tumors\, ii
 i) to develop dosimetry tools\, iv) to test new boron delivery drugs.\nThe
  facility is used for a number of other applications\, namely: i) for meas
 uring the cross section and the yield of nuclear reactions\, ii) for study
 ing radiation blistering of metals under ion implantation\, iii) for radia
 tion testing of advanced materials for ITER and CERN\, iv) for measuring t
 he thickness of the lithium layer\, v) for studying the composition of fil
 ms by back-scattered protons\, vi) for in-depth investigation of the 11B(p
 \,) neutronless fusion reaction\, etc.\nThe report will describe 
 the neutron source VITA\, present and discuss the results obtained\, and d
 eclare plans.\nThis research was supported by Russian Science Foundation\,
  grant No. 19-72-30005.\n\nhttps://events.sinp.msu.ru/event/8/contribution
 s/225/
LOCATION: НИИЯФ\, ЮК\, Ц-05
URL:https://events.sinp.msu.ru/event/8/contributions/225/
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BEGIN:VEVENT
SUMMARY:Study of extraction system “N\,O-donor heterocyclic amide/europi
 um nitrate” by EXAFS and 1H-NMR spectroscopy.
DTSTART;VALUE=DATE-TIME:20220713T145000Z
DTEND;VALUE=DATE-TIME:20220713T151000Z
DTSTAMP;VALUE=DATE-TIME:20260308T033721Z
UID:indico-contribution-39-475@events.sinp.msu.ru
DESCRIPTION:Speakers: Leonid Starostin (Moscow State University)\nOne of t
 he major problems of nuclear energy is long-term nuclear waste reprocessin
 g and storage. Current technologies are able to partially regenerate nucle
 ar fuel but lead to the accumulation of long-living high-level nuclear was
 te (HLW). Reducing nuclear waste levels requires the effective and selecti
 ve separation of minor actinides from HLW possessing high content of lanth
 anides.\nRecently we study derivatives of diamides of 2\,2'-bipyridyl-6\,6
 '-dicarboxylic acid\, such as bipy-4Hex as an extraction material. For dee
 per understanding of extraction process we study the structure of the euro
 pium complex of this ligand in crystal and solution\, as well as an extrac
 tion system with a ligand and europium nitrate.\nIn order to establish the
  atomic environment of europium we used the experimental EXAFS technique. 
 The absorption spectra of X-ray radiation for crystalline compounds and so
 lutions of europium complexes with nitric acid were measured. Experimental
  data on X-ray spectroscopy were obtained at the STM station of the Kurcha
 tov Synchrotron Radiation Center. The detection was carried out in the “
 transmission” mode and by the output of fluorescent radiation. A visual 
 comparison of the XANES spectra confirms the preservation of the degree of
  oxidation of Eu both in solution and in the crystalline state. Comparison
  of the Fourier transformed spectra of EXAFS shows the identity of the coo
 rdination spheres near Eu ion. In order to clarify the atomic geometry\, t
 he EXAFS spectra were adjusted.\nIn addition\, we used 1H-NMR spectroscopy
  to study extraction systems: the ligand solutions in nitrobenzene-d5 and 
 an aqueous solution of europium nitrate with different concentrations of n
 itric acid were mixed and the spectrum was obtained from the organic layer
 . At concentrations of nitric acid 1M and lower only ligand peaks were obs
 erved in the spectrum\, at higher concentrations of nitric acid\, peaks of
  the complex appeared. For such systems\, we calculated the complex-ligand
  concentration ratio from the spectra and distribution coefficients.\n\nht
 tps://events.sinp.msu.ru/event/8/contributions/475/
LOCATION: НИИЯФ\, ЮК\, Ц-05
URL:https://events.sinp.msu.ru/event/8/contributions/475/
END:VEVENT
BEGIN:VEVENT
SUMMARY:NEUTRON TOMOGRAPHY AND DIFFRACTION IN THE STUDY OF THE CULTURAL HE
 RITAGE OF ANTIQUITY AND THE MIDDLE AGES
DTSTART;VALUE=DATE-TIME:20220713T143000Z
DTEND;VALUE=DATE-TIME:20220713T145000Z
DTSTAMP;VALUE=DATE-TIME:20260308T033721Z
UID:indico-contribution-39-235@events.sinp.msu.ru
DESCRIPTION:Speakers: Bulat Bakirov (FLNP JINR)\nThe study of cultural her
 itage by state-of-the-art scientific methods is an important interdiscipli
 nary field. Of interest are archaeological finds made of metal [1\, 2]. Su
 ch artifacts store valuable information about the technological\, economic
  and social level of ancient states. Corrosion processes occurring in meta
 ls also require careful study\, because it improves restoration and conser
 vation methodologies. However\, research methods traditional in archeology
  are often unacceptable due to their destructive nature or give incorrect 
 information due to the small depth of penetration. In such cases\, neutron
  tomography and diffraction can be used [3].\nIn this work\, metal artifac
 ts of various ancient states located on the territory of modern Russia (Kr
 asnodar Krai\, Republic of Tatarstan\, etc.) were studied. Research was ca
 rried out at the facilities of the IBR-2 high-flux pulsed reactor: neutron
  radiography and tomography (NRT)\, DN-6 and DN-12 diffractometers. Using 
 neutron tomography\, spatial variations in the phase composition were visu
 alized\, the degree of degradation and the spread of corrosion were determ
 ined\, and the original appearance of some artifacts was reconstructed. Th
 e phase composition was measured by neutron diffraction and Raman spectros
 copy. The data obtained made it possible to shed light on aspects of the c
 raft\, to identify archaeological objects.\nIn addition\, we have encounte
 red a number of problems\, the solution of which requires the use of new a
 lgorithms for tomographic reconstruction. This is an improvement in the qu
 ality of the resulting models\, a decrease in the time spent on routine ac
 tions\, and a decrease in the time for the experiment. Therefore\, modern 
 approaches have been proposed and applied.\n\n1. Bakirov\, B.A.\, Kichanov
 \, S.E.\, Khramchenkova\, R.K. et al. J. Synch. Investig. 14\, (2020).\n2.
  Bakirov B.\, Saprykina I.\, Kichanov S. et al. J. Imaging. 7\, 129 (2021)
 .\n3. Podurets\, K.M.\, Kichanov\, S.E.\, Glazkov\, V.P. et al. Crystallog
 r. Rep. 66\, (2021).\n\nhttps://events.sinp.msu.ru/event/8/contributions/2
 35/
LOCATION: НИИЯФ\, ЮК\, Ц-05
URL:https://events.sinp.msu.ru/event/8/contributions/235/
END:VEVENT
BEGIN:VEVENT
SUMMARY:DIFFERENCE BETWEEN DISTRIBUTIONS OF INTERMEDIATE AND SLOW NEUTRON 
 FLUX FROM PHOTONEUTRON SOURCE EXIT CHANNEL
DTSTART;VALUE=DATE-TIME:20220713T141000Z
DTEND;VALUE=DATE-TIME:20220713T143000Z
DTSTAMP;VALUE=DATE-TIME:20260308T033721Z
UID:indico-contribution-39-423@events.sinp.msu.ru
DESCRIPTION:Speakers: Stanislav Potashev (Institute for Nuclear Research o
 f Russian Academy of Sciences)\nDistributions of intermediate and slow neu
 tron flux from the output collimated channel of the photoneutron source ar
 e measured. A cadmium filter is used to suppress slow neutrons in the meas
 urement of intermediate neutrons. A standard helium counter moved during m
 easurements and the two-coordinate neutron detector based on a thin $^{10}
 B$ layer combined with a proportional chamber are used [1]. The significan
 t difference in the experiment is observed in the distribution shape of tw
 o neutron groups with energies above and below the cadmium boundary. If th
 e distribution of intermediate neutrons has a symmetrical Gaussian shape\,
  then the distribution shape of slow neutrons is complex. The possible dif
 ference of the shapes is discussed.\n\n1. I. V. Meshkov\, S. I. Potash
 ev\, A. A. Afonin\, Yu. M. Burmistrov\, A. I. Drachev\, S. V. Zuye
 v\, S. Kh. Karaevsky\, A. A. Kasparov\, E. S. Konobeevski\, S. P. 
 Kuznetsov\, V. N. Marin\, V. N. Ponomarev\, G. V. Solodukhov\, Bull.
  Ras. Acad. Sci. Phys. 84\, 382 (2020).\n\nhttps://events.sinp.msu.ru/even
 t/8/contributions/423/
LOCATION: НИИЯФ\, ЮК\, Ц-05
URL:https://events.sinp.msu.ru/event/8/contributions/423/
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BEGIN:VEVENT
SUMMARY:THE PRESSURE EFFECT ON CRYSTAL AND MAGNETIC STRUCTURES OF VAN DER 
 WAALS MATERIALS
DTSTART;VALUE=DATE-TIME:20220713T132000Z
DTEND;VALUE=DATE-TIME:20220713T134000Z
DTSTAMP;VALUE=DATE-TIME:20260308T033721Z
UID:indico-contribution-39-333@events.sinp.msu.ru
DESCRIPTION:Speakers: O.N. Lis (FLNP JINR)\nThe recent discovery of magnet
 ic ordering in van der Waals (vdW) materials down to the monolayer limit h
 as opened a new direction in the field of two-dimensional materials\, allo
 wing researchers to explore magnetism in lower dimensions in simple crysta
 l systems. The advent of long-range 2D ferromagnetism brings about new tra
 nsport phenomena in two dimensions\, like tunneling magnetoresistance and 
 electrical switching of magnetic states promoting 2D ferromagnets as versa
 tile platforms for engineering new quantum states and device functionaliti
 es. CrBr3 and Fe3GeTe2 are also one of the brightest representatives of th
 is class of materials\, which also attract the attention of researchers be
 cause of the various observed physical phenomena. The knowledge of relatio
 nship between magnetic and crystal structure of such compounds\, which can
  be obtained from high-pressure investigations\, is very essential for und
 erstanding the nature and mechanism of physical phenomena observed in it.\
 nThe present work focuses on the investigations of crystal and magnetic st
 ructures of CrBr3 and Fe3GeTe2 in wide temperature and pressure ranges. De
 tailed studies of the crystal structure of the materials were carried out 
 using neutron diffraction on a DN-6 diffractometer of a pulsed high-flux I
 BR-2 reactor (FLNP\, JINR\, Dubna\, Russia) in temperature range of 6-300 
 K and at pressure up to 5 GPa. Neutron diffraction investigations of CrBr3
  revealed to observe the formation of the long-range ferromagnetic order w
 hich leads to the negative thermal volume expansion and anomalous thermal 
 variation of interatomic distances and angles\, caused by the spin-lattice
  coupling. Related effects were found in vibrational spectra of this compo
 und. Noticeable anomalies near the Curie point are observed on the tempera
 ture dependences of Raman peak frequencies as well as on their full-width 
 at half-maximum which indicates the strong spin-phonon coupling in CrBr3. 
 The high pressure effect made it possible to identify unusual changes in t
 he diffraction spectra and changes of Raman modes\, which may be associate
 d with a phase transition in CrBr3. It was also obtained the evolution of 
 the unit cell parameters\, bond lengths under high pressure. The X-ray dif
 fraction of Fe3GeTe2 at high pressure revealed anomalies on the baric beha
 vior of structural parameters without clearable structural transition with
  changing the symmetry. The vanishing of the vibrational modes of Fe3GeTe2
  at high pressures and low temperature can be caused by the suppression of
  the long-range magnetic order.\n\nhttps://events.sinp.msu.ru/event/8/cont
 ributions/333/
LOCATION: НИИЯФ\, ЮК\, Ц-05
URL:https://events.sinp.msu.ru/event/8/contributions/333/
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BEGIN:VEVENT
SUMMARY:ATOMIC K-SHELL DOUBLE HOLE CREATION DUE TO ELECTRON CAPTURE AND PH
 OTOIONIZATION
DTSTART;VALUE=DATE-TIME:20220713T130000Z
DTEND;VALUE=DATE-TIME:20220713T132000Z
DTSTAMP;VALUE=DATE-TIME:20260308T033721Z
UID:indico-contribution-39-363@events.sinp.msu.ru
DESCRIPTION:Speakers: Maksim Kiselev (Lomonosov Moscow State University)\n
 Double core hole (DCH) states could be created in two different mechanisms
 . The first is core subshell electron capture by the nucleus and subsequen
 t shake-process of an electron from the same subshell either to the high u
 noccupied state (shake-up) or to the continuum (shake-off) mostly due to i
 nstant changing of the nucleus charge by unity. Another way is photoioniza
 tion\, when one electron is “knocked out” from the subshell and the re
 sidual one undergoes shake-process resulting from changing in screened pot
 ential. Physics of the DCH currently attracts interest stimulated by new p
 ossibilities of their creation by X-ray free electron lasers and advanced 
 synchrotron sources. Furthermore\, DCHs might become a new tool for chemic
 al analysis [1] and plasma diagnostics [2].\n\nIn this theoretical contrib
 ution we compare the two mechanisms of producing the DCH: K-electron captu
 re and K-shell photoionization. General theoretical approaches to both pro
 blems are known\, but we are not aware of such a comparison based on up-to
 -date models for many-electron atoms. We focus on DCH states in K-shell of
  $^7$Be and $^{37}$Ar (isotopes with natural electron capture radioactivit
 y). The goal is to determine double K-vacancy production probability in bo
 th described channels. Also\, we analyze shake-off electron spectra and co
 mpare the results with different theoretical approaches and experiment.\n\
 nOur model is based on sudden approximation with the use of fully non-orth
 ogonal sets of electron orbitals in initial and final states\, accounting 
 for j-splitting of the subshells. Expansions for transition matrix element
 s are obtained with ZAP_NO package [3]. Radial wave functions are construc
 ted within the multiconfigurational Hartree-Fock method [4]. Photoionizati
 on calculations are performed with the use of B-spline R-matrix (BSR) soft
 ware complex [5].\n\nThis research was funded by the Russian Ministry of S
 cience and Education grant No. 075-15-2021-1353. The work of M.D.K. is sup
 ported by the Ministry of Science and Higher Education of the Russian Fede
 ration (project No. 0818-2020-0005) using resources of the Shared Services
  “Data Center of the Far-Eastern Branch of the Russian Academy of Scienc
 es”.\n\n1. M. Nakano et al.\, Phys. Rev. Lett. 110\, 163001 (2013).\n2. 
 A.Ya. Faenov et al.\, Laser and Particle Beams 33\, 27 (2015).\n3. O. Zats
 arinny\, Comput. Phys. Comm. 98\, 235 (1996).\n4. C.F. Fischer\, T. Brage 
 and P. Jonsson\, Computational Atomic Structure: An MCHF Approach (Bristol
 : IOP Publishing\, 1997).\n5. O. Zatsarinny\, Comput. Phys. Comm. 174\, 27
 3 (2006).\n\nhttps://events.sinp.msu.ru/event/8/contributions/363/
LOCATION: НИИЯФ\, ЮК\, Ц-05
URL:https://events.sinp.msu.ru/event/8/contributions/363/
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BEGIN:VEVENT
SUMMARY:ROLE OF POLARIZATION IN THE MULTIPLE IONIZATION BY AN INTENSE RADI
 ATION
DTSTART;VALUE=DATE-TIME:20220713T124000Z
DTEND;VALUE=DATE-TIME:20220713T130000Z
DTSTAMP;VALUE=DATE-TIME:20260308T033721Z
UID:indico-contribution-39-431@events.sinp.msu.ru
DESCRIPTION:Speakers: Elena Gryzlova (Skobeltsyn Institute of Nuclear Phys
 ics  Lomonosov Moscow State University)\nWhen an atom is irradiated by int
 ense electromagnetic field\, the first photoionization act initiates the v
 ariety of competitive processes\, such as sequential ionization\, Auger de
 cay\, radiation decay and other [1]. As a result\, the sample evolves and 
 its evolution depends on radiation parameters: intensity\, pulse duration 
 and polarization. The last is often left behind the scenes\, in particular
 \, because accounting for the polarization increases number of degrees of 
 freedom enormously. Here we present an approach based on a system of equat
 ions for statistical tensors [2]\, which are equivalent to a system of rat
 e equations for population\, but allows to shorten the number of equations
  noticeably. \nThe approach is applied to investigate the sequential multi
 ple ionization of krypton at photon energy range 50-80 eV as an illustrati
 ve example. The calculations are performed for the pulse parameters close 
 to modern free-electron laser facilities.\n\nThis research was funded by t
 he Russian Foundation for Basic Research (RFBR) under project No. 20-52-12
 023 and Russian Ministry of Science and Education grant No. 075-15-2021-13
 53. The work of M.D.K. is supported by the Ministry of Science and Higher 
 Education of the Russian Federation (project No. 0818-2020-0005) using res
 ources of the Shared Services “Data Center of the Far-Eastern Branch of 
 the Russian Academy of Sciences”.\n\n1. E.V. Gryzlova\, M.D. Kiselev\, M
 .M. Popova\, A.A. Zubekhin\, G. Sansone\, A.N. Grum-Grzhimailo\,  MDPI Ato
 ms\, 8\, 80 (2020).\n2. V.V. Balashov\, A.N. Grum-Grzhimailo. Polarization
  and Correlation Phenomena in Atomic Collisions. A Practical Theory Course
 . — NY.: Kluwer Academic / Plenum Publishers (2000).\n\nhttps://events.s
 inp.msu.ru/event/8/contributions/431/
LOCATION: НИИЯФ\, ЮК\, Ц-05
URL:https://events.sinp.msu.ru/event/8/contributions/431/
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SUMMARY:SYLA – RUSSIAN 4TH GENERATION SYNCHROTRON
DTSTART;VALUE=DATE-TIME:20220713T122000Z
DTEND;VALUE=DATE-TIME:20220713T124000Z
DTSTAMP;VALUE=DATE-TIME:20260308T033721Z
UID:indico-contribution-39-524@events.sinp.msu.ru
DESCRIPTION:Speakers: Vyacheslav Dyubkov (NRNU MEPhI\, NRC KI)\nFor more t
 han 40 years synchrotron-based x-ray sources as well as free-electron lase
 rs based on linear accelerators have been widely used in materials science
 \, spectroscopy\, crystallography\, research of fast processes\, medicine\
 , molecular biology and biochemistry\, medicine\, and other applied and sc
 ientific tasks. Nowadays state-of-art technologies make it possible to des
 ign and develop specialized synchrotron that is especially aimed to genera
 te SR by means of insertion devises\, such as ondulators or wigglers. Such
  specialized circular electron accelerators have been called SR sources of
  the 4th generation. Currently\, there are already several operating [1-3]
  and a number of such specialized SR sources are under design [4-6]. A num
 ber of 3rd generation light sources are under modernization up to 4th gene
 ration nowdaus. In order to advance the development of the research infras
 tructure of the Russian Federation\, by Decree of the President of the Rus
 sian Federation No. 356 of 25.06.2019\, a storage synchrotron (the 4th gen
 eration SR source) with an energy of 6 GeV and an equilibrium value of the
  horizontal emittance of the electron beam of no more than 70 pm∙rad (SY
 LA\, former USSR4) is being developed on the basis of NRC KI [7\,8]. This 
 paper presents the results of the development of the machine lattice as we
 ll as top-up linac injector.\n\n1. MAX IV Facility Detailed Design Report 
 / https://www.maxiv.lu.se/\n2. EBS Storage Ring Technical Report / https:/
 /www.esrf.eu/\n3. L. Liu\, R. T. Neuenschwander and A. R. D. Rodrigues\, S
 ynchrotron radiation sources in Brazil / .Phil. Trans. R. Soc. A 377: 2018
 0235 (2019).\n4. I. Agapov et al. PETRA IV: the ultralow-emittance source 
 project at DESY / J. Synchrotron Rad. (2018). 25\, 1277–1290.\n5. M. Bor
 land et al.\, Hybrid seven-bend-achromat lattice for the Advanced Photon S
 ource Upgrade / Proceedings of 2015 IPAC\, pp. 1776–1779.\n6. HEPS Xu G.
 \, Cui X.H.\, Duan Z.\, Guo. Y.Y. / Proceedings of International particle 
 accelerator conference. – Denmark\, 2017 – P. 2697 – 2699.\n7. S. Li
 uzzo et al.\, USSR HMBA Storage Ring Lattice Options // 12th IPAC\, May 20
 21\, Online\, Brazil. TUPAB049.\n8. L. Hoummi et al.\, Optimization and Er
 ror Studies for the USSR HMBA Lattice // 12th IPAC\, May 2021\, Online\, B
 razil. MOPAB224.\n\nhttps://events.sinp.msu.ru/event/8/contributions/524/
LOCATION: НИИЯФ\, ЮК\, Ц-05
URL:https://events.sinp.msu.ru/event/8/contributions/524/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Studying neutron spectrum of photoneutron source of INR RAS
DTSTART;VALUE=DATE-TIME:20220713T120000Z
DTEND;VALUE=DATE-TIME:20220713T122000Z
DTSTAMP;VALUE=DATE-TIME:20260308T033721Z
UID:indico-contribution-39-239@events.sinp.msu.ru
DESCRIPTION:Speakers: Alexey Afonin (INR RAS)\nA W-Be-photoneutron neutron
  source IN-LUE based on a linear electron accelerator was created and inst
 alled at the Institute for Nuclear Research of RAS [1]. The shape of the n
 eutron spectrum and flux estimation was obtained earlier as a result of si
 mulation [2]. Due to the impossibility of measuring the neutron spectrum i
 n a wide range of energies within the source\, various methods of spectrum
  unfolding based on the solution of the inverse problem are usually used.\
 nIn this work\, the results of unfolding the neutron spectrum into photone
 utron source chamber of the source are presented. As experimental data for
  unfolding\, we used the data of neutron activation analysis of samples ir
 radiated in the source (Ag\, Mg\, Mn\,Sb\, Ti\, etc.). To unfold the spect
 rum\, a number of well-known Nuclear Energy Agency (NEA) programs were use
 d [3]\, which implement various algorithms for solving the inverse problem
 . \nThis work also presents the results of measurements of the neutron flu
 x by various methods\, as well as their comparison.\n \n1. A.V.Andreev et 
 al. // Bull. Russ. Acad. Sci.: Phys.\, 2017\, V. 81\, P. 748.\n2. N.Sobole
 vsky // Fifth Int. Conf. on Nucl. Fragm. (NUFRA2015). Kemer. Oct. 2015.\n3
 . OECD Nuclear Energy Agency (NEA) Data Bank. Computer program services.\n
 \nhttps://events.sinp.msu.ru/event/8/contributions/239/
LOCATION: НИИЯФ\, ЮК\, Ц-05
URL:https://events.sinp.msu.ru/event/8/contributions/239/
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