Accurate Q value for the Se double-electron-capture decay |
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Authors: | VS Kolhinen V-V Elomaa T Eronen J Hakala A Jokinen M Kortelainen J Suhonen J Äystö |
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Institution: | 1. Department of Physics, Post Office Box 35 (YFL), FIN-40014, University of Jyväskylä, Finland;2. Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA;3. Physics Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831, USA |
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Abstract: | The Q value of the neutrinoless double-electron-capture (0νECEC) 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+ state (1204.205(7) keV) of 74Ge in a resonant 0νECEC 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 0νECEC processes. |
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Keywords: | Double-electron-capture decay Q value Penning trap |
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