Results on double beta decay of 82Se with CUPID-0 Phase I
L. PagnaniniO. AzzoliniJ. W. BeemanF. BelliniM. BerettaM. BiassoniC. BrofferioC. BucciS. CapelliL. CardaniP. CarnitiN. CasaliD. ChiesaM. ClemenzaO. CremonesiA. CrucianiI. DafineiS. Di DomizioF. FerroniL. GironiA. GiulianiP. GorlaC. GottiG. KeppelS. NagornyM. NastasiS. NisiC. NonesD. OrlandiM. PallaviciniL. PattavinaM. PavanG. PessinaV. PettinacciS. PirroS. PozziE. PrevitaliA. PuiuC. RusconiK. SchäffnerC. TomeiM. VignatiA. Zolotarova
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CUPID-0 is the first neutrinoless double beta decay (0νββ) experiment based on highly enriched scintillating bolometers. It consists in an array of Zn82Se detectors operated at LNGS since 2017. During the Phase I of data taking, concluded at the end of 2018, the experiment collected an exposure of 9.95 kg·yr of ZnSe. The simultaneous heat-light readout provides a powerful rejection of α-particles and allows us to suppress the background in the region of interest down to 3.5−0.9+1.0×10−3 counts/(keV·kg·y), an unprecedented level for this technique. Thanks to this achievement, we set the most stringent lower limit on the 82Se 0νββ half-life. Moreover, we have developed a full background model, which allows us to identify the origin of the events in the region of interest. The reconstruction of the CUPID-0 spectrum has enabled us to perform the most precise measurement of the 2νββ of 82Se.Keywords:
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Abstract Scintillating bolometer is a powerful tool to search neutrinoless double beta decay. We established a large scintillating bolometer using a 312 g CaF 2 (Eu) crystal with a readout technology of metallic magnetic calorimeters. A set of successful measurements were carried out for simultaneous detection for heat and light signals at 10-40 mK in an above-ground laboratory. We found large light signals with clear difference in scintillation yields between electron- and alpha-induced events. The comparison of relative amplitudes of heat and light signals obtained about 10 σ discrimination power. We also found the heat signals experiencing strong position dependence from the event location. This position dependence can be interpreted by the spin-lattice interaction of paramagnetic Eu ions in the CaF 2 crystal.
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