Shell-Model Analysis of the 136Xe Double Beta Decay Nuclear Matrix Elements

被引：79

作者：

Horoi, M. ^{[1
]}

Brown, B. A. ^{[2
,3
]}

机构：

[1] Cent Michigan Univ, Dept Phys, Mt Pleasant, MI 48859 USA

[2] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[3] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 22期

基金：

美国国家科学基金会;

关键词：

MASS REGIONS; CA-48; QRPA;

D O I：

10.1103/PhysRevLett.110.222502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Neutrinoless double beta decay, if observed, could distinguish whether the neutrino is a Dirac or a Majorana particle, and it could be used to determine the absolute scale of the neutrino masses. Xe-136 is one of the most promising candidates for observing this rare event. However, until recently there were no positive results for the allowed and less rare two-neutrino double beta decay mode. The small nuclear matrix element associated with the long half-life represents a challenge for nuclear structure models used for its calculation. We report a new shell-model analysis of the two-neutrino double beta decay of 136Xe, which takes into account all relevant nuclear orbitals necessary to fully describe the associated Gamow-Teller strength. We further use the new model to analyze the main contributions to the neutrinoless double beta decay matrix element, and show that they are also diminished.

引用

页数：5

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