Shell-model calculation for two-neutrino double beta decay of Ca48

Liang Zhao, B. Alex Brown, and W. A. Richter
Phys. Rev. C 42, 1120 – Published 1 September 1990
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Abstract

The 2νββ decay matrix element of Ca48 has been studied in a large basis shell-model space. The theoretical and experimental β and β+ spectra and their relation to 2νββ are discussed. A new empirical effective interaction is found to give the best agreement to β and β+ spectra with the effective Gamow-Teller operator σ̃t=0.77σt. The predicted T1/2=1.9×1019 yr differs by a factor of 2 from the present experimental limit of T1/2>3.6×1019 yr. We also compare the matrix elements obtained at various levels of the truncation in the shell-model space.

  • Received 12 February 1990

DOI:https://doi.org/10.1103/PhysRevC.42.1120

©1990 American Physical Society

Authors & Affiliations

Liang Zhao and B. Alex Brown

  • National Superconducting Cyclotron Laboratory and Department of Physics Astronomy, Michigan State University, East Lansing, Michigan 48824

W. A. Richter

  • Physics Department, University of Stellenbosch, Stellenbosch 7600, South Africa

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Vol. 42, Iss. 3 — September 1990

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