It is confirmed that the selection rule derived on the basis of the plane wave is still valid in the relativistic Coulomb wave case. The neutrino mass and the V+A current parameters are estimated from the analysis of experimental data.

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The double β decay is investigated by the use of the relativistic Coulomb wave function including the finite nuclear size effect. A general form of the V±A interactions is considered. It is shown that the decay rate is enhanced considerably in comparison with the case of the plane wave multiplied by the non-relativistic Fermi factor.

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Masaru Doi, Tsuneyuki Kotani, Hiroyuki Nishiura, Eiichi Takasugi, Double Beta Decay, Progress of Theoretical Physics, Volume 69, Issue 2, February 1983, Pages 602–635, https://doi.org/10.1143/PTP.69.602

The Energy Spectrum and the Angular Correlation in the ββ Decay Masaru Doi, Tsuneyuki Kotani, Hiroyuki Nishiura and Eiichi Takasugi