Precise half-life values for two neutrino double beta decay
Abstract
All existing "positive" results on two neutrino double beta decay in different nuclei were analyzed. Using the procedure recommended by the Particle Data Group, weighted average values for half-lives of 48Ca, 76Ge, 82Se, 96Zr, 100Mo, 100Mo - 100Ru (0+1), 116Cd, 130Te, 150Nd, 150Nd - 150Sm(0+1) and 238U were obtained. Existing geochemical data were analyzed and recommended values for half-lives of 128Te, 130Te and 130Ba are proposed. Given the measured half-life values, nuclear matrix elements were calculated. I recommend the use of these results as the most currently reliable values for the half-lives and nuclear matrix elements.
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