New determination of double- β -Decay properties in 48Ca: High-precision Qββ -Value measurement and improved nuclear matrix element calculations
We report a direct measurement of the Qββ value of the neutrinoless double-β-decay candidate 48Ca at the TITAN Penning-trap mass spectrometer, with the result that Qββ=4267.98(32)keV. We measured the masses of both the mother and daughter nuclides, and in the latter case found a 1 keV deviation from the literature value. In addition to the Qββ value, we also present results of a new calculation of the neutrinoless double-β-decay nuclear matrix element of 48Ca. Using diagrammatic many-body perturbation theory to second order to account for physics outside the valence space, we constructed an effective shell-model double-β-decay operator, which increased the nuclear matrix element by about 75% compared with that produced by the bare operator. The new Qββ value and matrix element strengthen the case for a 48Ca double-β-decay experiment. © 2014 American Physical Society.
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- Nuclear & Particles Physics
- 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
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Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Related Subject Headings
- Nuclear & Particles Physics
- 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics