CUPID-0, an array of ZnSe82 cryogenic calorimeters, was the first medium-scale demonstrator of the scintillating bolometers' technology. The first project phase (March 2017-December 2018) allowed the most stringent limit on the neutrinoless double beta decay half-life of the isotope of interest, Se82, to be set. After a six month long detector upgrade, CUPID-0 began its second and last phase (June 2019-February 2020). In this Letter, we describe the search for neutrinoless double beta decay of Se82 with a total exposure (phase I+II) of 8.82 kg yr-1 of isotope. We set a limit on the half-life of Se82 to the ground state of Kr82 of T1/20ν(Se82)>4.6×1024 yr (90% credible interval), corresponding to an effective Majorana neutrino mass mββ<(263-545) meV. We also set the most stringent lower limits on the neutrinoless decays of Se82 to the 01+, 21+, and 22+ excited states of Kr82, finding 1.8×1023 yr, 3.0×1023 yr, and 3.2×1023 yr (90% credible interval) respectively.
Azzolini, O., Beeman, J., Bellini, F., Beretta, M., Biassoni, M., Brofferio, C., et al. (2022). Final Result on the Neutrinoless Double Beta Decay of Se 82 with CUPID-0. PHYSICAL REVIEW LETTERS, 129(11) [10.1103/PhysRevLett.129.111801].
Final Result on the Neutrinoless Double Beta Decay of Se 82 with 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.;
2022
Abstract
CUPID-0, an array of ZnSe82 cryogenic calorimeters, was the first medium-scale demonstrator of the scintillating bolometers' technology. The first project phase (March 2017-December 2018) allowed the most stringent limit on the neutrinoless double beta decay half-life of the isotope of interest, Se82, to be set. After a six month long detector upgrade, CUPID-0 began its second and last phase (June 2019-February 2020). In this Letter, we describe the search for neutrinoless double beta decay of Se82 with a total exposure (phase I+II) of 8.82 kg yr-1 of isotope. We set a limit on the half-life of Se82 to the ground state of Kr82 of T1/20ν(Se82)>4.6×1024 yr (90% credible interval), corresponding to an effective Majorana neutrino mass mββ<(263-545) meV. We also set the most stringent lower limits on the neutrinoless decays of Se82 to the 01+, 21+, and 22+ excited states of Kr82, finding 1.8×1023 yr, 3.0×1023 yr, and 3.2×1023 yr (90% credible interval) respectively.
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