Nuclear transition matrix elements for neutrinoless double–β decay of 76Ge and 82Se isotopes

Abstract

Within mechanisms involving light and heavy Majorana neutrinos, the nuclear transition matrix elements (NTMEs) for the neutrinoless double-β decay of 76Ge and 82Se isotopes are calculated. Uncertainties in the average NTMEs M¯(0v) and M¯(0N) due to the exchange of light and heavy Majorana neutrinos, respectively, turn out to be about 10% and 37%, respectively. Limits on the effective mass of light Majorana neutrino 〈mν〉, heavy Majorana neutrino 〈MN〉 and Majoron-neutrino coupling constant 〈gM〉 of classical Majoron model are extracted.