New Limits on the Neutrino Mass, Lepton Conservation, and No-Neutrino Double Beta Decay of Ge76

F. T. Avignone, III, R. L. Brodzinski, D. P. Brown, J. C. Evans, Jr., W. K. Hensley, J. H. Reeves, and N. A. Wogman
Phys. Rev. Lett. 50, 721 – Published 7 March 1983
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Abstract

A continuing search for the no-neutrino mode of the double beta decay of Ge76 has resulted in a new lower limit T120ν>~1.7×1022 yr. This value corresponds to a 90% confidence level determined with a maximum-likelihood analysis of the energy interval 2041±2 keV. Combined with recent shell-model calculations, the data imply mν<~10 eV and a limit on lepton nonconservation |η|<~2.4×105. In the context of the shell model, the data imply that the electron neutrino is not a Majorana mass eigenstate.

  • Received 1 November 1982

DOI:https://doi.org/10.1103/PhysRevLett.50.721

©1983 American Physical Society

Authors & Affiliations

F. T. Avignone, III

  • Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208

R. L. Brodzinski, D. P. Brown, J. C. Evans, Jr., W. K. Hensley, J. H. Reeves, and N. A. Wogman

  • Pacific Northwest Laboratory, Richland, Washington 99352

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Vol. 50, Iss. 10 — 7 March 1983

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