Searches for the neutrino magnetic moment in a time-dependent flux of reactor antineutrinos

Problems associated with searches for the neutrino magnetic moment at a lev el of 10(-11)mu(B) in experiments at nuclear reactors are considered. To ac hieve such sensitivity, it is necessary to detect recoil electrons from <(n u)over bar>(e) e scattering at extremely low kinetic energies. The event co unting rate is independent of the energy spectrum of antineutrinos, but it depends on their flux, which undergoes strong variations during the reactor operating period. The sources of a neutrino flux are considered, and their time dependence is studied. The developed computer code makes it possible to describe accurately the actual operating periods including residual anti neutrino emission during shutdown periods.