Measurement of the 2$\nu \beta \beta$ Decay Half-life of ${}^{130}$Te with CUORE

Abstract

We measured two-neutrino double beta decay of ${}^{130}$Te using an exposure of 300.7 kg$\cdot$yr accumulated with the CUORE detector. Using a Bayesian analysis to fit simulated spectra to experimental data, it was possible to disentangle all the major background sources and precisely measure the two-neutrino contribution. The half-life is in agreement with past measurements with a strongly reduced uncertainty: $T_{1/2}^{2\nu }=7.71_{-0.06}^{+0.08}{(stat.)}_{-0.15}^{+0.12}(syst.)\times 10^{20}$ yr. This measurement is the most precise determination of the ${}^{130}$Te 2$\nu \beta \beta$ decay half-life to date.

Published in PRL

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