The production of backward pions in lepton-nucleus collisions is analyzed. We
show that a large yield of high momentum backward pions can be explained by the
Regge asymptotic of the distribution of nucleons carrying a large momentum
fraction in the nuclear target. The calculated spectra of pions emitted in the
neutrino + Ne --> muon + pion + X reaction are in satisfactory agreement with
the available experimental data.Comment: 11 pages, 3 figure
