Two-neutrino double beta decay of deformed nuclei within QRPA with realistic interaction

TL;DR

This paper develops a QRPA method incorporating realistic nucleon interactions to study two-neutrino double beta decay in deformed nuclei, providing insights into deformation effects on decay observables.

Contribution

It introduces a novel implementation of realistic nucleon-nucleon interactions within QRPA for deformed nuclei, enabling more accurate decay predictions.

Findings

Deformation significantly affects decay observables.

Calculated decay rates for $^{76}$Ge and $^{150}$Nd.

Gamow-Teller strength distributions analyzed.

Abstract

A method to implement realistic nucleon-nucleon residual interaction (Bonn CD force) based on the Brueckner G-matrix into the Quasiparticle Random Phase Approximation (QRPA) for deformed nuclei is formulated. The two-neutrino double decay for ground state to ground state transitions $^{76}$Ge$ \to ^{76}$Se and $^{150}$Nd $\to ^{150}$Sm is calculated along with the Gamow-Teller strength distributions. The effect of deformation on the observables is studied.