  A neutrino produced in a particle decay maintains an unusual wave nature that
reveals a diffraction phenomenon in a large spatial region. Diffraction gives a
new component to a neutrino flux in this region and modifies determinations of
physical quantities in neutrino experiments. A total cross section of neutrino
nucleon scattering at high energies is studied in this paper. A cross section
is proportional to an energy in the quark-parton model and is modified with the
energy-dependent neutrino flux induced by the diffraction component. A total
number of events divided by the energy is not constant but has a slight energy
dependence. Theoretical values agree well with the recent experiments.
