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In this work we analyze the effects of quantum decoherence upon theprecession of the neutrino polarization vector in a supernovae-likeenvironment. In order to perform the study we have determined thetime-dependence of the polarization vector by solving the equation of motionfor different neutrino-mixing schemes. The results of the calculations showthat the onset of decoherence depends strongly on the parameters of the adoptedmixing scheme. As examples we have considered : a) the mixing between activeneutrinos and b) the mixing between active end sterile neutrinos.

Decoherence-effects in the neutrino-mixing mechanism: active and sterile neutrinos in the three flavor scheme