  Studies of neutrinos commonly ignore anti-symmetrization of their wave
functions. This implicitly assumes that either spatial wave functions for
neutrinos with approximately the same momentum do not overlap or their
overlapping has no measurable consequences. We examine these assumptions by
considering the evolution of three-dimensional neutrino wave packets (WPs). We
find that it is perfectly adequate to treat accelerator and reactor neutrinos
as separate WPs for typical experimental setup. While solar and supernova
neutrinos correspond to overlapping WPs, they can be treated effectively as
non-overlapping for analyses of their detection.
