Evaluation of the resonance enhancement effect in neutrinoless double-electron capture in 152Gd, 164Er and 180W atoms

TL;DR

This paper investigates the resonance enhancement in neutrinoless double-electron capture for specific isotopes, calculating nuclear matrix elements and estimating half-lives to guide experimental searches.

Contribution

It provides detailed calculations of matrix elements and half-lives for 0nECEC in 152Gd, 164Er, and 180W using the deformed QRPA with realistic interactions, advancing theoretical understanding.

Findings

Calculated nuclear matrix elements for the isotopes.

Estimated half-lives based on recent Q-value data.

Discussed experimental prospects for detecting 0nECEC.

Abstract

We study the resonant neutrinoless double-electron capture (0nECEC) in 152Gd, 164Er and 180W atoms, associated with the ground-state to ground-state nuclear transitions. The corresponding matrix elements are calculated within the deformed QRPA using the realistic Bonn-CD nucleon-nucleon interaction. The half-lives are estimated with the use of the most recent precision data on the Q-values of these processes. Perspectives of experimental search for the 0nECEC with the isotopes 152Gd, 164Er and 180W are discussed.