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Single- and low-lying-states dominance in two-neutrino double-beta decay

AutorMoreno, Óscar; Álvarez-Rodríguez, Raquel ; Sarriguren, Pedro ; Moya de Guerra, Elvira ; Šimkovic, F.; Faessler, A.
Fecha de publicaciónene-2009
EditorInstitute of Physics Publishing
CitaciónJournal of Physics G: Nuclear and Particle Physics 36: 015106 (2009)
ResumenA theoretical analysis of the single-state dominance hypothesis for the two-neutrino double-beta decay rates is performed on the examples of the double-beta decays of 100Mo, 116Cd and 128Te. We also test the validity of an extended low-lying-state dominance that takes into account the contributions of the low-lying excited states in the intermediate nucleus to the double-beta decay rates. This study has been accomplished for all the double-beta emitters for which we have experimental information on their half-lives. The theoretical framework is a proton–neutron quasiparticle random-phase approximation based on a deformed Skyrme Hartree–Fock mean field with pairing correlations. Our calculations indicate that there are no clear evidences for single- or low-lying-state dominance in the two-neutrino double-beta decay. Finally, we investigate the single-electron energy distributions of the outgoing electrons in the double-beta decay processes with an exact treatment of the energy denominators, which could help for a more comprehensive analysis of NEMO-3 data.
Descripción19 pages, 5 tables, 6 figures.--Available on line on Oct 30, 2008.--ArXiv pre-print available at: http://arxiv.org/abs/0811.0319
Versión del editorhttp://dx.doi.org/10.1088/0954-3899/36/1/015106
ISSN0954-3899 (Print)
1361-6471 (Online)
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