  The possibility of distinguishing Dirac and Majorana fermions by cosmic
torsion in the spatial-flat FRW spacetime is discussed. The scattering
amplitudes of two types of fermions deviate from each other by the vector part
of torsion in non-minimal coupling case. The scattering of massive fermions by
cosmic torsion leads to a shift of final state energy distribution. The
difference between shift values of two types of fermions can be used to
distinguish fermion types of neutrinos.
