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The proposed high flux lithium antineutrino source is based on7Li(n,g)8Li-activation and subsequent fast beta-decay (0.84 s) of the 8Liisotope with emission of hard antineutrinos with energy up to 13 MeV. In thediscussed scheme the nuclear reactor is used as an intensive neutron source for(n,g)-activation. The created 8Li isotopes are transported in the channels witha high speed to the remote neutrino detector and removed back for the nextactivation. The antineutrino source operates in the continuous cycle in theclosed loop. Use of 8Li hard antineutrino spectrum in the source scheme ensuressignificantly harder total antineutrino spectrum (compare to the reactor one)in the position of the detector. The analyses of errors of the totalantineutrino spectrum (from reactor antineutrinos plus from lithium ones)confirmed that owing to the lithium the errors of the total antineutrinospectrum can be diminished in two times and more. The results of errorsanalysis is important for sterile neutrino search and the possibleconfiguration of the experiment is discussed.

High flux lithium antineutrino source with variable hard spectrum. How to decrease the errors of the total spectrum ?