Accurate Q value for the 74Se double-electron-capture decay

被引：61
|
作者：
Kolhinen, V. S. [1 ]
Elomaa, V. -V. [1 ]
Eronen, T. [1 ]
Hakala, J. [1 ]
Jokinen, A. [1 ]
Kortelainen, M. [2 ,3 ]
Suhonen, J. [1 ]
Aysto, J. [1 ]
机构：
[1] Univ Jyvaskyla, Dept Phys, FIN-40014 Jyvaskyla, Finland
[2] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
[3] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA
来源：
PHYSICS LETTERS B | 2010年 / 684卷 / 01期
基金：
芬兰科学院;
关键词：
Double-electron-capture decay; Q value; Penning trap; DOUBLE-BETA-DECAY; PRECISION MASS-SPECTROMETRY; PENNING TRAPS; RAMSEY METHOD;
D O I：
10.1016/j.physletb.2009.12.052
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The Q Value of the neutrinoless double-electron-capture (OvECEC) decay of 74 Se was measured by using the JYFLTRAP Penning trap. The determined value is 1209.169(49) keV, which practically excludes (lie possibility of a complete energy degeneracy with the second 2(+) state (1204.205(7) keV) of Ge-74 in a resonant OvECEC decay. We have also computed the associated nuclear matrix element by using a microscopic nuclear model with realistic two-nucleon interactions. The computed matrix element is found to be quite small. The failure of the resonant condition, combined with the small nuclear matrix element and needed p-wave capture, suppresses the decay rate strongly and thus excludes 74 Se as a possible candidate to search for resonant OvECEC processes. (C) 2010 Elsevier 13M. All rights reserved.
引用
收藏
页码：17 / 21
页数：5
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