Average and recommended half-life values for two neutrino double beta decay: upgrade-09

TL;DR

This paper consolidates and updates the half-life values for various isotopes undergoing two neutrino double beta decay, providing the most precise and reliable recommended values based on a comprehensive analysis of experimental and geochemical data.

Contribution

It offers a systematic review and weighted average of half-life values for multiple isotopes, updating previous data with improved accuracy and reliability.

Findings

Recommended half-life values for several isotopes are provided.

Analysis includes both experimental and geochemical data.

The study establishes the most precise half-life estimates to date.

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 $^{48}$Ca, $^{76}$Ge, $^{82}$Se, $^{96}$Zr, $^{100}$Mo, $^{100}$Mo - $^{100}$Ru ($0^+_1$), $^{116}$Cd, $^{130}$Te, $^{150}$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, $^{130}$Te and $^{130}$Ba are proposed. We recommend the use of these results as presently the most precise and reliable values for half-lives.