Average and recommended half-life values for two-neutrino double beta decay: upgrade-2019

Understand

All existing positive results on two neutrino double beta decay and two neutrino double electron capture 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 ($0^+_1$), $^{238}$U, $^{78}$Kr and $^{124}$Xe 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.