  We study the decay of heavy sterile Majorana neutrinos according to the
interactions obtained from an effective general theory. We describe the two and
three-body decays for a wide range of neutrino masses. The results obtained and
presented in this work could be useful for the study of the production and
detection of this particles in a variety of high energy physics experiments and
astrophysical observations. We show in different figures the dominant branching
ratios and the total decay width.
