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New determination of double-β-decay properties in 48Ca: High-precision Qββ-value measurement and improved nuclear matrix element calculations

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Simon,  Vanessa V.
TRIUMF;
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Fakultät für Physik und Astronomie, Ruprecht-Karls-Universität;

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Citation

Kwiatkowski, A., Brunner, T., Holt, J., Chaudhuri, A., Chowdhury, U., Eibach, M., et al. (2014). New determination of double-β-decay properties in 48Ca: High-precision Qββ-value measurement and improved nuclear matrix element calculations. Physical Review C, 89(4): 045502. doi:10.1103/PhysRevC.89.045502.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0018-E673-5
Abstract
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 the 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 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 the Qββ value and matrix element strengthen the case for a 48Ca double-β-decay experiment.