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20 April 2024

» arxiv » 1308.3815

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New determination of double-beta-decay properties in 48Ca: high-precision Q-value measurement and improved nuclear matrix element calculations
A. A. Kwiatkowski ; T. Brunner ; J. D. Holt ; A. Chaudhuri ; U. Chowdhury ; M. Eibach ; J. Engel ; A. T. Gallant ; A. Grossheim ; M. Horoi ; A. Lennarz ; T. D. Macdonald ; M. R. Pearson ; B. E. Schultz ; M. C. Simon ; R.A. Senkov ; V. V. Simon ; K. Zuber ; J. Dilling ;
Date:	18 Aug 2013
Abstract:	We report a direct measurement of the Q-value of the neutrinoless double-beta-decay candidate 48Ca at the TITAN Penning-trap mass spectrometer, with the result that Q = 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 Q-value, we also present results of a new calculation of the neutrinoless double-beta-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-beta-decay operator, which increased the nuclear matrix element by about 75% compared with that produced by the bare operator. The new Q-value and matrix element strengthen the case for a 48Ca double-beta-decay experiment.
Source:	arXiv, 1308.3815
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