Intensive electron antineutrino source with well defined hard spectrum on the base of nuclear reactor and 8-lithium transfer. The promising experiment for sterile neutrinos search

The new concept of antineutrino source for future short-baseline experiments is discussed. The source ensures: 1) well defined hard antineutrino flux; 2) the rate of counts more than ~(1E+2 - 1E+3) per day in the detector volume about cubic meter; 3) low level of count errors - < 1%. The proposed source is based on (n,gamma)-activation of 7Li near the reactor active zone and transport of the fast beta-decaying 8Li isotope toward a remote neutrino detector and back in the closed loop. The proposed experiment allows to detect (electron antineutrino, p)-interaction with high precision and directed to search of sterile neutrinos with squared-mass difference between sterile and active neutrinos ~1 eV2. The results of simulation for (3+1) and (3+2) sterile neutrino models indicate the space regions for search of electron antineutrino-disappearance outside the spectrum errors.Comment: 14 pages; 9 figures; 34 reference

Nucleosynthesis of Heavy Elements in Thermonuclear Explosions 'Mike', 'Par' and 'Barbell'

The formation of transuranium nuclides in pulsed neutron fluxes of thermo-nuclear explosions is investigated in the kinetic model of the astrophysical r-process, taking into account time dependence of the external parameters and including the processes accompanying the β-decay of neutron-rich nuclei. Time-dependent neutron fluxes in the interval ∼ 10−6 s were modeled within the developed adiabatic binary model. Probabilities of β-delayed processes were calculated using the microsco-pic theory of finite Fermi systems. Calculations of the yields of transuranium nuclides Y(A) are made for three experimental USA thermonuclear explosions ”Mike” (

Heavy and superheavy elements production in high intensive fluxes of explosive process

Mathematical model of heavy and superheavy nuclei production in intensive pulsed neutron fluxes of explosive process is developed. The pulse character of the process allows dividing it in time into two stages: very short rapid process of multiple neutron captures with higher temperature and very intensive neutron fluxes, and relatively slower process with lower temperature and neutron fluxes. The model was also extended for calculation of the transuranium yields in nuclear explosions takes into account the adiabatic character of the process, the probabilities of delayed fission, and the emission of delayed neutrons. Also the binary starting target isotopes compositions were included. Calculations of heavy transuranium and transfermium nuclei production were made for Mike, Par and Barbel experiments, performed in USA. It is shown that the production of transfermium neutron-rich nuclei and superheavy elements with A ~ 295 is only possible in case of binary mixture of starting isotopes with the significant addition of heavy components, such as long-lived isotopes of curium, or californium.Comment: 15 pages, 6 figures, 26 Refererence