Nuclear matrix elements for the 0νββ(0+2+) decay of Ge76 within the two-nucleon mechanism

Dong-Liang Fang and Amand Faessler
Phys. Rev. C 103, 045501 – Published 12 April 2021

Abstract

In this paper, we present the first beyond closure calculation for the neutrinoless double-β decay of Ge76 to the first 2+ states of Se76 within the two nucleon mechanism. The isospin symmetry restored quasiparticle random-phase approximation method with the charge-dependent-Bonn realistic force is adopted for the nuclear structure calculations. We analyze the structure of the nuclear matrix elements and estimate the uncertainties from our nuclear many-body calculations. We find gpp plays an important role for the calculations, and if quenching is included, suppression for the transition matrix element Mλ is found. Our results for the transition matrix elements are about one order of magnitude larger than previous projected Hartree-Fock-Bogolyubov results with the closure approximation.

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  • Received 1 February 2021
  • Accepted 22 March 2021

DOI:https://doi.org/10.1103/PhysRevC.103.045501

©2021 American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsNuclear Physics

Authors & Affiliations

Dong-Liang Fang1,2 and Amand Faessler3

  • 1Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
  • 2School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Institute for Theoretical Physics, Tübingen University, Tübingen D-72076, Germany

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Issue

Vol. 103, Iss. 4 — April 2021

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