  It is considered the detection of neutrinos moving from the opposite
directions. The states of the particle of the detector interacting with the
neutrinos are connected with the P-transformation. Hence only a half of
neutrinos gives contribution into the superposition of the neutrino states.
Taking into account the effect of the opposite neutrino directions the total
neutrino flux from several sources are in the range 0.5--1 of that without the
effect. The neutrino flux from nuclear reactors measured in the KamLAND
experiment is $0.611\pm 0.085 {\rm (stat)} \pm 0.041 {\rm (syst)} $ of the
expected flux. Calculations for the conditions of the KamLAND experiment yield
the neutrino flux taking into account the effect of the opposite neutrino
directions, 0.555, of that without the effect that may account for the neutrino
flux observed in the KamLAND experiment.
