  We analyse the possibility of distinguishing Dirac and Majorana neutrinos in
future neutrino factory experiments in which neutrinos are produced in muon
decay when, in addition to a vector type as in the SM, there are also scalar
interactions. We check this possibility in an experiment with a near detector,
where the observed neutrinos do not oscillate, and in a far detector, after the
neutrino oscillations. Neglecting higher-order corrections, even neutrino
observation in the near detector does not give a chance to differentiate their
character. However, this possibility appears in the leading-order after the
neutrino oscillations observed in far detector.
