2β0v-decay mediated by heavy Majorana neutrinos and nucleon weak magnetism and pseudoscalar coupling

Abstract

The role of the nucleon weak magnetism and pseudoscalar coupling interactions in the calculation of the 2β0v-decay of48Ca mediated by heavy Majorana neutrinos has been examined. The effect of a finite nucleon size has been taken into account by employing the phenomenological form factors and form factors calculated in the framework of the quark confinement model. By using the PCAC predictions it has been found that by taking into account these interactions the absolute values of the 2β0v-decay matrix elements of48Ca reduces considerably, which provides us with less stringent limits on the parameter of the non-conservation of the lepton charge.