CUPID-0 is the first pilot experiment of CUPID, a next-generation project searching for neutrinoless double beta decay. In its first scientific run, CUPID-0 operated 26 ZnSe cryogenic calorimeters coupled to light detectors in the underground Laboratori Nazionali del Gran Sasso. In this work, we analyzed a ZnSe exposure of 11.34 kg year to search for the neutrinoless double beta decay of 70Zn and for the neutrinoless positron-emitting electron capture of 64Zn. We found no evidence for these decays and set 90% credible interval limits of T1/20νββ(70Zn) > 1.6 10 21 year and T1/20νECβ+(64Zn) > 1.2× 10 22 year, surpassing by more than one order of magnitude the previous experimental results (Belli et al. in J Phys G 38(11):115107, https://doi.org/10.1088/0954-3899/38/11/115107, 2011).
Azzolini, O., Beeman, J., Bellini, F., Beretta, M., Biassoni, M., Brofferio, C., et al. (2020). Search for neutrinoless double beta decay of 64 Zn and 70 Zn with CUPID-0. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 80(8) [10.1140/epjc/s10052-020-8280-4].
Search for neutrinoless double beta decay of 64 Zn and 70 Zn 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.;Pagnanini L.;Pattavina L.;Pavan M.;Pessina G.;Pozzi S.;Previtali E.;Puiu A.;
2020
Abstract
CUPID-0 is the first pilot experiment of CUPID, a next-generation project searching for neutrinoless double beta decay. In its first scientific run, CUPID-0 operated 26 ZnSe cryogenic calorimeters coupled to light detectors in the underground Laboratori Nazionali del Gran Sasso. In this work, we analyzed a ZnSe exposure of 11.34 kg year to search for the neutrinoless double beta decay of 70Zn and for the neutrinoless positron-emitting electron capture of 64Zn. We found no evidence for these decays and set 90% credible interval limits of T1/20νββ(70Zn) > 1.6 10 21 year and T1/20νECβ+(64Zn) > 1.2× 10 22 year, surpassing by more than one order of magnitude the previous experimental results (Belli et al. in J Phys G 38(11):115107, https://doi.org/10.1088/0954-3899/38/11/115107, 2011).
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