کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1852212 | 1033951 | 2010 | 5 صفحه PDF | دانلود رایگان |
The Q value of the neutrinoless double-electron-capture (0νECEC0νECEC) decay of 74Se was measured by using the JYFLTRAP Penning trap. The determined value is 1209.169(49) keV, which practically excludes the possibility of a complete energy degeneracy with the second 2+2+ state (1204.205(7) keV) of 74Ge in a resonant 0νECEC0νECEC 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 74Se as a possible candidate to search for resonant 0νECEC0νECEC processes.
Journal: Physics Letters B - Volume 684, Issue 1, 1 February 2010, Pages 17–21