The Cryogenic Underground Observatory for Rare Events (CUORE) is a large-scale cryogenic experiment searching for neutrinoless double-beta decay (0νββ) in Te130. The CUORE detector is made of natural tellurium, providing the possibility of rare event searches on isotopes other than Te130. In this work we describe a search for neutrinoless positron-emitting electron capture (β+EC) decay in Te120 with a total TeO2 exposure of 355.7 kg yr, corresponding to 0.2405 kg yr of Te120. Albeit 0νββ with two final-state electrons represents the most promising channel, the emission of a positron and two 511-keV γ's make 0νβ+EC decay signature extremely clear. To fully exploit the potential offered by the detector modularity we include events with different topology and perform a simultaneous fit of five selected signal signatures. Using blinded data we extract a median exclusion sensitivity of 3.4×1022 yr at 90% credibility interval (C.I.). After unblinding we find no evidence of 0νβ+EC signal and set a 90% C.I. Bayesian lower limit of 2.9×1022 yr on Te120 half-life. This result improves by an order of magnitude the existing limit from the combined analysis of CUORE-0 and Cuoricino.

Adams, D., Alduino, C., Alfonso, K., Avignone, F., Azzolini, O., Bari, G., et al. (2022). Search for neutrinoless β+ EC decay of Te 120 with CUORE. PHYSICAL REVIEW C, 105(6), 1-12 [10.1103/PhysRevC.105.065504].

Search for neutrinoless β+ EC decay of Te 120 with CUORE

Beretta M.;Biassoni M.;Branca A.;Brofferio C.;Canonica L.;Capelli S.;Carniti P.;Chiesa D.;Clemenza M.;Cremonesi O.;Dell'oro S.;Faverzani M.;Ferri E.;Fiorini E.;Giachero A.;Gianvecchio A.;Gironi L.;Gotti C.;Nastasi M.;Nucciotti A.;Nutini I.;Pattavina L.;Pavan M.;Pessina G.;Pozzi S.;Previtali E.;Puiu A.;Sisti M.;Terranova F.;
2022

Abstract

The Cryogenic Underground Observatory for Rare Events (CUORE) is a large-scale cryogenic experiment searching for neutrinoless double-beta decay (0νββ) in Te130. The CUORE detector is made of natural tellurium, providing the possibility of rare event searches on isotopes other than Te130. In this work we describe a search for neutrinoless positron-emitting electron capture (β+EC) decay in Te120 with a total TeO2 exposure of 355.7 kg yr, corresponding to 0.2405 kg yr of Te120. Albeit 0νββ with two final-state electrons represents the most promising channel, the emission of a positron and two 511-keV γ's make 0νβ+EC decay signature extremely clear. To fully exploit the potential offered by the detector modularity we include events with different topology and perform a simultaneous fit of five selected signal signatures. Using blinded data we extract a median exclusion sensitivity of 3.4×1022 yr at 90% credibility interval (C.I.). After unblinding we find no evidence of 0νβ+EC signal and set a 90% C.I. Bayesian lower limit of 2.9×1022 yr on Te120 half-life. This result improves by an order of magnitude the existing limit from the combined analysis of CUORE-0 and Cuoricino.
Articolo in rivista - Articolo scientifico
Te-120; Double Beta Decay; Cryo-detectors
English
16-giu-2022
2022
105
6
1
12
065504
reserved
Adams, D., Alduino, C., Alfonso, K., Avignone, F., Azzolini, O., Bari, G., et al. (2022). Search for neutrinoless β+ EC decay of Te 120 with CUORE. PHYSICAL REVIEW C, 105(6), 1-12 [10.1103/PhysRevC.105.065504].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/392588
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