New determination of double-β-decay properties in 48Ca: High-precision Qββ-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, and J. Dilling
Phys. Rev. C 89, 045502 – Published 9 April 2014

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 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.

  • Figure
  • Received 17 August 2013

DOI:https://doi.org/10.1103/PhysRevC.89.045502

©2014 American Physical Society

Authors & Affiliations

A. A. Kwiatkowski1,*, T. Brunner1,†, J. D. Holt2,3, A. Chaudhuri1, U. Chowdhury1,4, M. Eibach5,6, J. Engel7, A. T. Gallant1,8, A. Grossheim1, M. Horoi9, A. Lennarz1,10, T. D. Macdonald1,8, M. R. Pearson1, B. E. Schultz1, M. C. Simon1, R. A. Senkov9, V. V. Simon1,11,6,‡, K. Zuber12, and J. Dilling1,8

  • 1TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
  • 2Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
  • 3ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
  • 4Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
  • 5Institut für Kernchemie, Johannes Gutenberg-Universität, 55128 Mainz, Germany
  • 6Fakultät für Physik und Astronomie, Ruprecht-Karls-Universität, 69120 Heidelberg, Germany
  • 7Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599, USA
  • 8Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
  • 9Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
  • 10Institut für Kernphysik, Westfälische Wilhelms-Universität, 48149 Münster, Germany
  • 11Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
  • 12Institiut für Kern- und Teilchenphysik, Technische Universität Dresden, 01069 Dresden, Germany

  • *aniak@triumf.ca
  • Present Address: Department of Physics, Stanford University, Stanford, California 94305, USA.
  • Present Address: Helmholtz-Institut Mainz, 55128 Mainz, Germany.

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Vol. 89, Iss. 4 — April 2014

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