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Advances in High Energy Physics
Volume 2016, Article ID 6391052, 12 pages
http://dx.doi.org/10.1155/2016/6391052
Research Article

Nuclear Structure Calculations for Two-Neutrino Double-β Decay

1Instituto de Estructura de la Materia, IEM-CSIC, Serrano 123, 28006 Madrid, Spain
2Departamento de Física Atómica, Molecular y Nuclear, Universidad Complutense de Madrid, 28040 Madrid, Spain

Received 17 June 2016; Revised 26 August 2016; Accepted 19 September 2016

Academic Editor: Theocharis Kosmas

Copyright © 2016 P. Sarriguren et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.

Abstract

We study the two-neutrino double- decay in 76Ge, 116Cd, 128Te, 130Te, and 150Nd, as well as the two Gamow-Teller branches that connect the double- decay partners with the states in the intermediate nuclei. We use a theoretical microscopic approach based on a deformed self-consistent mean field with Skyrme interactions including pairing and spin-isospin residual forces, which are treated in a proton-neutron quasiparticle random-phase approximation. We compare our results for Gamow-Teller strength distributions with experimental information obtained from charge-exchange reactions. We also compare our results for the two-neutrino double- decay nuclear matrix elements with those extracted from the measured half-lives. Both single-state and low-lying-state dominance hypotheses are analyzed theoretically and experimentally making use of recent data from charge-exchange reactions and decay of the intermediate nuclei.