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 $^{ 48}$Ca, $^{ 76}$Ge, $^{ 82}$Se, $^{ 96}$Zr, $^{ 100}$Mo, $^{ 100}$Mo - $^{ 100}$Ru ($0^+_1$), $^{ 116}$Cd, $^{ 130}$Te, $^{ 136}$Xe, $^{ 150}$Nd, $^{ 150}$Nd - $^{ 150}$Sm ($0^+_1$) and $^{ 238}$U were obtained. Existing geochemical data were analyzed and recommended values for half-lives of $^{ 128}$Te and $^{ 130}$Ba are proposed. I recommend the use of these results as the most currently reliable values for half-lives.
Categories: nucl-ex