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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...

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Main Authors: Kwiatkowski, Anna (Author) , Brunner, Thomas (Author) , Holt, J. D. (Author) , Chaudhuri, A. (Author) , Chowdhury, U. (Author) , Eibach, M. (Author) , Engel, J. (Author) , Gallant, Aaron (Author) , Grossheim, A. (Author) , Horoi, M. (Author) , Lennarz, A. (Author) , Macdonald, T. D. (Author) , Pearson, M. R. (Author) , Schultz, B. E. (Author) , Simon, Martin C. (Author) , Senkov, R. A. (Author) , Simon, Vanessa Véronique (Author) , Zuber, K. (Author) , Dilling, J. (Author)
Format: Article (Journal)
Language:English
Published: 9 April 2014
In: Physical review. C, Nuclear physics
Year: 2014, Volume: 89, Issue: 4
ISSN:1089-490X
DOI:10.1103/PhysRevC.89.045502
Online Access:Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevC.89.045502
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevC.89.045502
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Author Notes: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, and J. Dilling
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Summary: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.
Item Description:Im Titel ist die Zahl 48 hochgestellt, die Zeichen ββ sind tiefgestellt
Gesehen am 04.09.2020
Physical Description:Online Resource
ISSN:1089-490X
DOI:10.1103/PhysRevC.89.045502

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