%0 Journal Article
%T New determination of double-beta-decay properties in 48Ca: high-precision Q-value measurement and improved nuclear matrix element calculations
%A A. A. Kwiatkowski
%A T. Brunner
%A J. D. Holt
%A A. Chaudhuri
%A U. Chowdhury
%A M. Eibach
%A J. Engel
%A A. T. Gallant
%A A. Grossheim
%A M. Horoi
%A A. Lennarz
%A T. D. Macdonald
%A M. R. Pearson
%A B. E. Schultz
%A M. C. Simon
%A R. A. Senkov
%A V. V. Simon
%A K. Zuber
%A J. Dilling
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevC.89.045502
%X 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.
%U http://arxiv.org/abs/1308.3815v1