Sub-GeV atmospheric neutrinos background in organic liquid scintillation detectors

Atmospheric neutrinos are produced in interactions of cosmic rays with atomic nuclei in the Earths atmosphere. In low energy neutrino experiments they are mainly considered as a background for studied processes. For atmospheric neutrinos in sub-GeV range we present semi-analytical expected yield for four neutrino detection reactions: νe -ES, νp -ES, inverse β -decay and ¹²C( ν, ν ^′)¹²C^*(15.11 MeV), as well as results of Monte-Carlo simulation for other ν ¹² C interaction channels. Calculations are made for 4 neutrino experiments and include neutrino oscillation averaged over neutrino arrival directions. (paper)