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Nuclear matrix elements for Majoron-emitting double-β decay

J. Kotila1,2,* and F. Iachello2,†

  • 1Finnish Institute for Educational Research, University of Jyväskylä, P.O. Box 35, 40014 Jyväskylä, Finland
  • 2Center for Theoretical Physics, Sloane Physics Laboratory Yale University, New Haven, Connecticut 06520-8120, USA

  • *jenni.kotila@jyu.fi
  • †francesco.iachello@yale.edu
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Phys. Rev. C 103, 044302 – Published 1 April, 2021

DOI: https://doi.org/10.1103/PhysRevC.103.044302

Abstract

A complete calculation of the nuclear matrix elements (NMEs) for Majoron emitting neutrinoless double beta decay within the framework of IBM-2 for spectral indices n=1,3,7 is presented. By combining the results of this calculation with previously calculated phase-space factors (PSFs) we give predictions for expected half-lives. By comparing with experimental limits on the half-lives we set limits on the coupling constants 〈geeM〉 of all proposed Majoron-emitting models.

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Phys. Rev. C 103, 044302– Published 1 April, 2021
  • Received 3 November 2020
  • Accepted 18 March 2021
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