Speaker
Description
CUPID-0, an array of Zn$^{82}$Se cryogenic calorimeters, was the first large-scale demonstrator of the scintillating bolometers technology. The first project phase (March 2017 - December 2018) allowed to set the most stringent limit on the neutrinoless double beta decay half-life of the isotope of interest, $^{82}$Se. After a six months long detector upgrade, CUPID-0 began its second and last phase (June 2019 - February 2020). In this poster, we describe the search for neutrinoless double beta decay of $^{82}$Se with a total exposure (phase I + II) of 8.82 kg$\cdot$yr of isotope. We set a limit on the half-life of such decay to the ground state of $^{82}$Kr of T$^{0\nu}_{1/2}$($^{82}$Se)> 4.6$\cdot$10$^{24}$ yr (90% credible interval), corresponding to an effective Majorana neutrino mass m$_{\beta\beta}$ < (276 - 570) meV. We also set the most stringent limit on the neutrinoless decays of $^{82}$Se to the 0$^+_1$ , 2$^+_1$ and 2$^+_2$ excited states of $^{82}$Kr.
| Collaboration | CUPID-0 collaboration |
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