# 17th International Conference on Topics in Astroparticle and Underground Physics (TAUP 2021)

26 August 2021 to 3 September 2021

## The ultimate limit on 82Se neutrinoless double-beta decay search with CUPID-0

31 Aug 2021, 17:10
1h 30m
Talk in parallel session Neutrino physics and astrophysics

### Speaker

Lorenzo Pagnanini (INFN - LNGS & GSSI)

### Description

CUPID-0 is the first pilot experiment of CUPID, a next-generation project to search for neutrinoless double beta decay (0νDBD) with scintillating bolometers.

The detector, consisting of 24 enriched and 2 natural ZnSe crystals, has been taking data at Laboratori Nazionali del Gran Sasso from March 2017 to December 2018 (Phase I) and from May 2019 to February 2020 (Phase II), for a total exposure of 16.59 kg yr of ZnSe.
In this contribution, we present the new combined results of Phase-I and Phase II in the search for Se-82 0νDBD, both to the ground state and to the excited states of Kr-82.
The successful operation of the CUPID-0 detector demonstrates that scintillating calorimeters allow us to reach the lowest background for calorimetric experiments: (3.5+1.0−0.9)×10−3 counts/(keV kg yr).
We reach a 90% credible interval median sensitivity of $0.7~\times~10^{25}$ yr and set the most stringent limit on the half-life of Se-82 0vDBD, $T_{1/2}^{0\nu} > 4.7~\times~10^{24}$ yr (90% credible interval), corresponding to $m_{\beta\beta} < (276 - 570)$ meV depending on the nuclear matrix element calculations.
The CUPID-0 result surpasses the sensitivity foreseen for scheduled Se82-based experiments, and it is therefore a candidate to be the best result on the Se-82 for a long time.

### Primary author

Lorenzo Pagnanini (INFN - LNGS & GSSI)

### Presentation Materials

 CUPID-0_Pagnanini_TAUP2021_compressed.pdf CUPID-0_Pagnanini_TAUP2021.pdf The ultimate limit on Se82 neutrinoless double-beta decay search with CUPID-0 | Lorenzo Pagnanini | TAUP 2021
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