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Title

Theoretical mean-field and experimental occupation probabilities in the double-beta decay system Ge-76 to Se-76

AuthorsMoreno, Óscar; Moya de Guerra, Elvira ORCID; Sarriguren, Pedro CSIC ORCID; Faessler, Amand
KeywordsDouble beta decay
Occupation probabilities
Issue Date6-Apr-2010
PublisherAmerican Physical Society
CitationPHYSICAL REVIEW C 81, 041303(R) (2010)
AbstractUsual Woods-Saxon single-particle levels with BCS pairing are not able to reproduce the experimental occupation probabilities of the proton and neutron levels 1p(3/2), 1p(1/2), 0f(5/2), and 0g(9/2) in the double-beta decay system Ge-76 to Se-76. Shifting down the 0g(9/2) level by hand can explain the data, but it is not satisfactory. Here it is shown that a self-consistent Hartree-Fock + BCS approach with experimental deformations for Ge-76 and Se-76 may decisively improve the agreement with the recent data on occupation probabilities by J. P. Schiffer et al. [Phys. Rev. Lett. 100, 112501 (2008)] and B. P. Kay et al. [Phys. Rev. C 79, 021301(R) (2009)]. Best agreement with available data on Ge-76 and Se-76, as well as on neighbor isotopes, is obtained when the spin-orbit strength for neutrons is allowed to be larger than that for protons. The two-neutrino double-beta decay matrix element is also shown to agree with the data.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevC.81.041303
URIhttp://hdl.handle.net/10261/31791
DOI10.1103/PhysRevC.81.041303
Appears in Collections:(CFMAC-IEM) Artículos




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