Elsevier

Nuclear Physics A

Volume 582, Issues 1–2, 23 January 1995, Pages 124-140
Nuclear Physics A

Neutrinoless double beta decay in heavy deformed nuclei

https://doi.org/10.1016/0375-9474(94)00464-XGet rights and content

Abstract

The zero-neutrino mode of the double beta decay in heavy deformed nuclei is investigated in the framework of the pseudo-SU(3) model, which has provided an accurate description of collective nuclear structure and predicted half-lives for the two-neutrino mode in good agreement with experiments. In the case of 238U the calculated zero-neutrino half-life is at least three orders of magnitude greater than the two-neutrino one, giving strong support of the identification of the radiochemically determined half-life as being the two-neutrino double beta decay. For 150Nd the zero-neutrino matrix elements are of the order of magnitude of, but lesser than, those evaluated using the QRPA. This result confirms that different nuclear models produce similar zero-neutrino matrix elements, contrary to the two-neutrino case. Using these pseudo-SU(3) results and the upper limit for the neutrino mass we estimate the ββ0ν half-lives for six nuclei. An upper limit for majoron coupling constant is extracted from the experimental data.

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  • Work supported in part by Conacyt under contract 3513-E9310.

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