# ICHEP 2022

Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

## Status of the search for ${}^{48}$ Ca double beta decay with CANDLES

Jul 8, 2022, 7:05 PM
1h 25m
Bologna, Italy

#### Bologna, Italy

Palazzo della Cultura e dei Congressi
Poster Neutrino Physics

### Speaker

Dr Yuto Minami (Research Center for Nuclear Physics, Osaka University)

### Description

The origin of neutrino masses remains shrouded in mystery. One of the possible scenarios is that neutrinos have Majorana masses, which leads to neutrinoless double-beta decay ($0\nu\beta\beta$). CANDLES is a project to search for the $0\nu\beta\beta$ events from ${}^{48}\mathrm{Ca}$, which has a relatively high Q$_{\beta\beta}$-value of $4.27\,$MeV among the known double beta decay nuclei. We developed a CANDLES-III system with 96 $\mathrm{CaF}_2$ scintillation crystals with natural Ca isotope, which corresponds to $350\,$g of ${}^{48}\mathrm{Ca}$, and took data with about $652$ days of observation from $2016$. We are preparing a method to reduce $\beta$-decay background events to increase the sensitivity to the signal.
In this talk, a development of the method for background reduction and the latest status of the search for the $0\nu\beta\beta$ will be reported.

In-person participation No

### Primary author

Dr Yuto Minami (Research Center for Nuclear Physics, Osaka University)

### Presentation materials

 20220704_Poster_CANDLES_Minami_ICHEP2022_2.7.pdf ICHEP_Poster_Minami.mp4