Elsevier

Physics Letters B

Volume 312, Issue 4, 19 August 1993, Pages 367-371
Physics Letters B

Estimation of bounds for left-right mixing from nuclear double beta decay processes

https://doi.org/10.1016/0370-2693(93)90968-NGet rights and content

Abstract

Nuclear matrix elements, extracted from a systematic calculation of neutrinoless double beta decay rates for 0+g.s→o+g.s transitions in 76Ge, 82Se, 128Te, 130Te and 136Xe, have been used to compute bounds on the left-right mixing angle ζ of the weak currents. The parameters of the nuclear model have been fixed by calculating the corresponding two-neutrino double beta decay half lives. The present analysis favours a mixing of the order of |tanξ| < 10−3 which is to be compared with those obtained in muon decay (|tan ξ| ⩽ 0.035) and in supernova (|tan ξ| ⩽ 10−5) analysis. It shows that nuclear structure calculations yield estimates on ξ which complement the existing data.

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Work supported by the Academy of Finland, contract no. 1031155.

1

Fellow of the CONICET, Argentina.

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