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

TL;DR

This paper reports the most precise measurement to date of the two-neutrino double beta decay half-life of $^{130}$Te using the CUORE detector, achieving reduced uncertainties through Bayesian spectral analysis.

Contribution

It provides the most accurate measurement of $^{130}$Te's 2$ uetaeta$ decay half-life, improving precision over previous results with a Bayesian analysis approach.

Findings

Half-life measured as $7.71^{+0.08}_{-0.06} imes 10^{20}$ years.

Strongly reduced uncertainty compared to past measurements.

Confirmed consistency with previous measurements.

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: $T^{2\nu}_{1/2} = 7.71^{+0.08}_{-0.06}\mathrm{(stat.)}^{+0.12}_{-0.15}\mathrm{(syst.)}\times10^{20}$ yr. This measurement is the most precise determination of the $^{130}$Te 2$\nu\beta\beta$ decay half-life to date.