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

Kolhinen, V.S.; Elomaa, V.V.; Eronen, T.; Hakala, J.; Jokinen, A.; Kortelainen, M.; Suhonen, J.; Aysto, J.

doi:10.1016/j.physletb.2009.12.052

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

2010

5 pages

Published in:

Phys.Lett.B 684 (2010) 17-21

DOI:

10.1016/j.physletb.2009.12.052

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Abstract: (Elsevier)

The Q value of the neutrinoless double-electron-capture ( 0 ν ECEC ) decay of 74 Se 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 74 Ge in a resonant 0 ν ECEC 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 0 ν ECEC processes.

Double-electron-capture decay
Q value
Penning trap

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