Nuclear transition matrix elements for neutrinoless double-β decay of 76Ge isotope within PHFB approach

Employing projected-Hartree-Fock-Bogoliubov (PHFB) model, nuclear transition matrix elements (NTMEs) M-(K) for the neutrinoless double-beta(-) decay of Ge-76 isotope are calculated within mechanisms involving light as well as heavy Majorana neutrinos, and classical Majorons. By considering the spin-tensor decomposition of realistic KUO and empirical JUN45 effective two-body interactions, it is noticed that the effect due to SRC on NTMEs M-(0 nu) and M-(0N) involving the exchange of light and heavy Majorana neutrinos, respectively, is maximally incorporated by the central part of the effective two-body interaction, which varies by a small amount with the inclusion of spin-orbit and tensor components. Presently, the model-dependent uncertainties in the average NTMEs (M) over bar ((0 nu)) and (M) over bar ((0N)) turn out to be about 10% and 37%, respectively.