  An intensive antineutrino source with a hard spectrum (with energy up to 13
MeV, average energy 6.5 MeV) can be realized on the base of beta-decay of short
living isotope 8Li (0.84 s). The 8Li isotope (generated in activation of 7Li
isotope) is a prime perspective antineutrino source owing to the hard
antineutrino spectrum and square dependence of cross section on the energy. Up
today nuclear reactors are the most intensive neutrino sources. Antineutrino
reactor spectra have large uncertainties in the summary antineutrino spectrum
at energy E>6 MeV. Use of 8Li isotope allows to decrease sharply the
uncertainties or to exclude it completely. An intensive neutron fluxes are
requested for rapid generation of 8Li isotope. The installations on the base of
nuclear reactors can be an alternative for nuclear reactors as traditional
neutron sources. It is possible creation of neutrino sources another in
principle: on the base of tandem of accelerators, neutron generating targets
and lithium converter. An intensive neutron flux (i.e., powerful neutron
source) is requested for realization of considered neutrino sources (neutrino
factories). Different realizations of lithium antineutrino sources (lithium
converter on the base of high purified 7Li isotope) are discussed: static
regime (i.e., without transport of 8Li isotope to the neutrino detector);
dynamic regime (transport of 8Li isotope to the remote detector in a closed
cycle); an operation of lithium converter in tandem of accelerator with a
neutron-producing target on the base of tungsten, lead or bismuth. Different
chemical compounds of lithium (as the substance of the converter) are
considered. Heavy water solution of LiOD is proposed as a serious alternative
to high-pure 7Li in a metallic state.
