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

## TL;DR

This paper consolidates and updates the half-life values for various isotopes undergoing two-neutrino double beta decay and electron capture, providing recommended values based on experimental and geochemical data.

## Contribution

It offers a comprehensive analysis and recommended half-life values for multiple isotopes, updating previous data with a standardized procedure.

## Key findings

- Recommended half-life values for numerous isotopes established.
- Analysis of geochemical data led to new half-life estimates for some isotopes.
- Provides a reliable reference for future research in double beta decay.

## Abstract

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.