CUPID-0 is a pilot experiment in scintillating cryogenic calorimetry for the search of neutrino-less double beta decay. 26 ZnSe crystals were operated continuously in the first project phase (March 2017 - December 2018), demonstrating unprecedented low levels of background in the region of interest at the Q-value of 82Se. From this successful experience comes a demonstration of full alpha to beta/gamma background separation, the most stringent limits on the 82Se neutrino-less double beta decay, as well as the most precise measurement of the 82Se half-life. After a detector upgrade, CUPID-0 began its second and last phase (June 2019 - February 2020). We present the latest results on the neutrino-less double beta decay of 82Se with the full isotope exposure of 8.82 kg × yr. We set a lower bound to the ground state half life T1/2(82Se) > 4.6 × 1024 yr (90% C.I.). We review the most recent results from a Bayesian search for spectral distortions to the 82Se double-beta decay spectrum due to exotic decay modes.
Fantini, G., Azzolini, O., Beeman, J., Bellini, F., Beretta, M., Biassoni, M., et al. (2022). Latest results from CUPID-0. Intervento presentato a: 41st International Conference on High Energy Physics, ICHEP 2022 - 6 July 2022 through 13 July 2022, Bologna, Italy [10.22323/1.414.0599].
Latest results from CUPID-0
Beretta, M;Biassoni, M;Brofferio, C;Capelli, S;Carniti, P;Chiesa, D;Clemenza, M;Cremonesi, O;Gironi, L;Gotti, C;Nastasi, M;Pattavina, L;Pavan, M;Pessina, G;Pozzi, S;Previtali, E;Puiu, A;
2022
Abstract
CUPID-0 is a pilot experiment in scintillating cryogenic calorimetry for the search of neutrino-less double beta decay. 26 ZnSe crystals were operated continuously in the first project phase (March 2017 - December 2018), demonstrating unprecedented low levels of background in the region of interest at the Q-value of 82Se. From this successful experience comes a demonstration of full alpha to beta/gamma background separation, the most stringent limits on the 82Se neutrino-less double beta decay, as well as the most precise measurement of the 82Se half-life. After a detector upgrade, CUPID-0 began its second and last phase (June 2019 - February 2020). We present the latest results on the neutrino-less double beta decay of 82Se with the full isotope exposure of 8.82 kg × yr. We set a lower bound to the ground state half life T1/2(82Se) > 4.6 × 1024 yr (90% C.I.). We review the most recent results from a Bayesian search for spectral distortions to the 82Se double-beta decay spectrum due to exotic decay modes.
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