  The work is devoted to development of hard electron antineutrino source with
variable and regulated (controlled) spectrum. The high flux antineutrino source
with hard antineutrino spectrum based on neutron activation of 7Li and
subsequent fast beta-decay (T 1/2 = 0.84 s) of the 8Li isotope with emission of
antineutrino with energy up to 13 MeV - is discussed. Creation of the intensive
isotope neutrino source of hard spectrum will allow to increase the detection
statistics of neutrino interaction and it is especially urgent for oscillation
experiments. The scheme of the proposed neutrino source is based on the
continuous transport of the created 8Li to the neutrino detector, which moved
away from the place of neutron activation. Analytical expressions for lithium
antineutrino flux is obtained. The discussed source will ensure to increase the
cross section for reactions with deuteron from several times to tens compare to
the reactor antineutrino spectrum. An another unique feature of the
installation is the possibility to vary smoothly the hardness of the
antineutrino spectrum.
