Neutrinoless double-β decay of deformed nuclei within quasiparticle random-phase approximation with a realistic interaction (original) (raw)

In this paper a microscopic state-of-the-art approach to calculation of the nuclear matrix element M 0ν for neutrinoless double beta decay with an account for nuclear deformation is presented in length and applied for 76 Ge, 150 Nd and 160 Gd. The proton-neutron quasiparticle random phase approximation (QRPA) with a realistic residual interaction [the Brueckner G matrix derived from the charge-depending Bonn (Bonn-CD) nucleon-nucleon potential] is used as the underlying nuclear structure model. The effects of the short range correlations and the quenching of the axial vector coupling constant g A are analyzed. The results show that neutrinoless double beta decay of 150 Nd, to be measured soon by the SNO+ collaboration, provides one of the best probes of the Majorana neutrino mass. This confirms our preliminary conclusion in Ref. .