Search for Double-Beta Decay of $\mathrm{^{130}Te}$ to the $0^+$ States of $\mathrm{^{130}Xe}$ with CUORE
2021
The CUORE experiment is a large bolometric array searching for the lepton number violating neutrino-less double beta decay (
$$0\nu \beta \beta $$
) in the isotope $$\mathrm {^{130}Te}$$
. In this work we present the latest results on two searches for the double beta decay (DBD) of $$\mathrm {^{130}Te}$$
to the first $$0^{+}_2$$
excited state of $$\mathrm {^{130}Xe}$$
: the $$0\nu \beta \beta $$
decay and the Standard Model-allowed two-neutrinos double beta decay (
$$2\nu \beta \beta $$
). Both searches are based on a 372.5 kg
$$\times $$
yr TeO
$$_2$$
exposure. The de-excitation gamma rays emitted by the excited Xe nucleus in the final state yield a unique signature, which can be searched for with low background by studying coincident events in two or more bolometers. The closely packed arrangement of the CUORE crystals constitutes a significant advantage in this regard. The median limit setting sensitivities at 90% Credible Interval (C.I.) of the given searches were estimated as $$\mathrm {S^{0\nu }_{1/2} = 5.6 \times 10^{24} \, \mathrm {yr}}$$
for the $${0\nu \beta \beta }$$
decay and $$\mathrm {S^{2\nu }_{1/2} = 2.1 \times 10^{24} \, \mathrm {yr}}$$
for the $${2\nu \beta \beta }$$
decay. No significant evidence for either of the decay modes was observed and a Bayesian lower bound at $$90\%$$
C.I. on the decay half lives is obtained as: $$\mathrm {(T_{1/2})^{0\nu }_{0^+_2} > 5.9 \times 10^{24} \, \mathrm {yr}}$$
for the $$0\nu \beta \beta $$
mode and $$\mathrm {(T_{1/2})^{2\nu }_{0^+_2} > 1.3 \times 10^{24} \, \mathrm {yr}}$$
for the $$2\nu \beta \beta $$
mode. These represent the most stringent limits on the DBD of $$^{130}$$
Te to excited states and improve by a factor $$\sim 5$$
the previous results on this process.
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