Precise half-life values for two-neutrino double-βdecay

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 ${}^{48}\mathrm{Ca}$, ${}^{76}\mathrm{Ge}$, ${}^{82}\mathrm{Se}$, ${}^{96}\mathrm{Zr}$, ${}^{100}\mathrm{Mo}$, ${}^{100}\mathrm{Mo}$-${}^{100}\mathrm{Ru}$ ($0_1^{+}$), ${}^{116}\mathrm{Cd}$, ${}^{130}\mathrm{Te}$, ${}^{150}\mathrm{Nd}$, ${}^{150}\mathrm{Nd}$-${}^{150}\mathrm{Sm}$ ($0_1^{+}$), and ${}^{238}\mathrm{U}$ were obtained. Existing geochemical data were analyzed, and recommended values for half-lives of ${}^{128}\mathrm{Te}$, ${}^{130}\mathrm{Te}$, and ${}^{130}\mathrm{Ba}$ 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. DOI: http://dx.doi.org/10.1103/PhysRevC.81.035501 © 2010 The American Physical Society