Precise half-life values for two neutrino double beta decay

TL;DR

This paper consolidates and refines the half-life measurements for various isotopes undergoing two neutrino double beta decay, providing recommended values and nuclear matrix elements based on analysis of experimental and geochemical data.

Contribution

It offers the most reliable, updated half-life values and nuclear matrix elements for multiple isotopes, improving the precision of double beta decay data.

Findings

Recommended half-life values for multiple isotopes.

Calculated nuclear matrix elements from measured half-lives.

Proposed reliable data for future research and experiments.

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. 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.