Journal
PHYSICAL REVIEW C
Volume 81, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.81.032501
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Funding
- NSF [PHY0652849]
- NIST PMG
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The atomic masses of Ge-74, Se-74, Ge-76, and Se-76 have been determined from cyclotron frequency ratios of pairs of ions simultaneously trapped in a cryogenic Penning trap. Allowing for cancellation of systematic errors in the mass differences between isobars, we determine the Q value for double-electron capture of Se-74 to be 1209.240(7) keV, and the Q value for double-electron emission of Ge-76 to be 2039.061(7) keV. The new Q(2EC) value for Se-74 precludes a large resonant enhancement for neutrinoless double-electron capture.
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