BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Variants of intensive antineutrino sources on the base of 8Li isot
 ope
DTSTART;VALUE=DATE-TIME:20220714T153000Z
DTEND;VALUE=DATE-TIME:20220714T155000Z
DTSTAMP;VALUE=DATE-TIME:20260608T105813Z
UID:indico-contribution-471@events.sinp.msu.ru
DESCRIPTION:Speakers: Vladimir Lyashuk (Institute for Nuclear Research (IN
 R) of the Russian Academy of Sciences)\nThe winning properties combination
  of the β--decayed 8Li isotope (short $T {_{1/2}}$= 0.84 s\, hard and kno
 wn antineutrino spectrum (with maximum at ~13 MeV and average energy = 6.5
  MeV)  and availability of lithium are the undoubted base to consider 8Li 
 as the very perspective isotope for construction of the antineutrino sourc
 e as the powerful instrument for different neutrino experiments. In spite 
 of the high antineutrino flux from nuclear reactors the spectrum are chara
 cterized with significant errors ((4-6)% -precision at energy up to ~6 MeV
 )  caused by unknown schemes of decays\, time variations\, presence of the
  spent nuclear fuel\, that put together cause an unsolved puzzles in preci
 sion and interpretation of neutrino oscillation results [1].\n   The const
 ruction of the intensive antineutrino source is possible in different sche
 mes basing as on the nuclear reactor (as neutron source for (n\,γ)-activa
 tion of purified 7Li) as on the tandem scheme of the accelerator with neut
 ron producing target plus lithium blanket (neutron converter) irradiated b
 y $^{7}{\\rm Li}(n\,\\gamma)^{8} {\\rm Li}$ activation [2]. In the source 
 realized in transport regime (first variant) an activated 7Li is pumped in
  the close cycle through the active zone of the reactor\; further (in сyc
 le) it is delivered close to the neutrino detector. The scheme really allo
 ws to decrease the total spectrum errors in order of values [3]. Another f
 eature of this concept is high count rate ensured in the compact (about cu
 bic meter) neutrino detector – ~10e+4 $(\\bar \\nu{_e} \, p)$-events ($m
 ^{-3}$$day^{-1}$GW$^{-1}$) [4]. \n  In the other perspective realization t
 he proton beam strike into the heavy-element-target and produces the signi
 ficant neutron yield for the lithium blanket irradiation. The scheme is co
 nsidered for energies up to ~600 MeV for different heavy targets (W\, Pb\,
  Vi\, Ta). The density of 8Li creation is simulated in details that allowe
 d to propose an effective blanket scheme with central lithium containing v
 olume enclosed by carbon (acting as an effective neutron reflector) and ou
 ter thick water layer for diminish the neutron escape. The analysis of 8Li
  distribution in the blanket allows to propose an alternative approach of 
 tandem schemes based on developed compact accelerators with proton energy 
 about several tens of MeV that opens another important possibility - to co
 nstruct a small-volume-antineutrino-source (of short dimension ~70 cm) tha
 t is exclusively important for search of sterile neutrinos in case of $\\D
 elta m^2 \\ge 1\\: {\\text{эВ}}^2$   [ 5].\n\n1. C. Giunti\, Y.F. Li\, C
 .A. Ternes\, and Z. Xin. arXiv:2110.06820 (2022).\n2. V.I. Lyashuk & Yu.S.
  Lutostansky. Bull. Russ. Acad. Sci. Phys. 79\, 431–436 (2015).  [https:
 //doi.org/10.3103/S106287381504022X][1]\n3. V.I. Lyashuk. Results Phys. 7\
 , 1212 (2017). [https://doi.org/10.1016/j.rinp.2017.03.025][2].\n4. V.I. L
 yashuk. JHEP06 (2019)135. [DOI: 10.1007/JHEP06(2019)135][3]\n5. J. Kopp\, 
 M. Maltoni and T. Schwetz\, Phys. Rev. Lett. 107\, 091801 (2011). DOI:[htt
 ps://doi.org/10.1103/PhysRevLett.107.091801][4]\n\n\n  [1]: https://doi.or
 g/10.3103/S106287381504022X\n  [2]: https://doi.org/10.1016/j.rinp.2017.03
 .025\n  [3]: https://doi.org/10.1007/JHEP06(2019)135\n  [4]: https://doi.o
 rg/10.1103/PhysRevLett.107.091801\n\nhttps://events.sinp.msu.ru/event/8/co
 ntributions/471/
LOCATION: Физический ф-т\, ауд. 5-42
URL:https://events.sinp.msu.ru/event/8/contributions/471/
END:VEVENT
END:VCALENDAR