Coulomb effect in operator expansion method for two-neutrino double beta decay

Kazuo Muto
Phys. Rev. C 48, 402 – Published 1 July 1993
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Abstract

The operator expansion method for the evaluation of the 2ν ββ decay nuclear matrix element is extended to include the Coulomb interaction and nuclear central and tensor interactions. It is shown that the Coulomb interaction, which represents a part of one-body terms of Hamiltonian, plays a decisive role in taking into account effects of ground-state correlations, and a significant improvement is achieved in simulating the ‘‘exact’’ calculation based on the quasiparticle RPA. However, this method does not reproduce the strong suppression of the nuclear matrix element, probably because of the two-body approximation.

  • Received 25 March 1993

DOI:https://doi.org/10.1103/PhysRevC.48.402

©1993 American Physical Society

Authors & Affiliations

Kazuo Muto

  • Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro, Tokyo 152, Japan

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Vol. 48, Iss. 1 — July 1993

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