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Half-Life and Precision Shape Measurement of the 2νββ Decay of ^{130}Te
D Q Adams1, C Alduino1, K Alfonso2
1Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208, USA.
Abstract:
We present a new measurement of the 2νββ half-life of ^{130}Te (T_{1/2}^{2ν}) using the first complete model of the CUORE data, based on 1038 kg yr of collected exposure. Thanks to optimized data selection, we achieve a factor of two improvement in precision, obtaining T_{1/2}^{2ν}=(9.32 _{-0.04}^{+0.05}stat _{-0.07}^{+0.07}syst)×10^{20} yr. The signal-to-background ratio is increased by 70% compared to our previous results, enabling the first application of the improved 2νββ formalism to ^{130}Te. Within this framework, we determine a credibility interval for the effective axial coupling in the nuclear medium as a function of nuclear matrix elements. We also extract values for the higher-order nuclear matrix element ratios: second-to-first and third-to-first. The second-to-first ratio agrees with nuclear model predictions, while the third-to-first ratio deviates from theoretical expectations. These findings provide essential tests of nuclear models and key inputs for future 0νββ searches.
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