Volume 380 - Particles and Nuclei International Conference 2021 (PANIC2021) - Neutrino physics
Status of $^{48}$Ca double beta decay search with CANDLES
S. Umehara*, K.I. Fushimi, T. Harada, A. Hashimoto, R. Hazama, T. Hiraiwa, T. Iga, T. IIda, Y. Kawashima, Y. Kishida, T. Kishimoto, K. Matsuoka, G. Miyoshi, Y. Muramatsu, K. Nakajima, M. Nomachi, I. Ogawa, A. Rittirong, T. Sakai, A. Sakaue, K. Suzuki, Y. Takihira, Y. Tamagawa, M. Tozawa, A. Yamamoto, S. Yoshida, T. Yoshida and A. Yoshiokaet al. (click to show)
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Pre-published on: March 28, 2022
Published on:
Abstract
We have studied the neutrino-less double beta
decay(0$\nu\beta\beta$) of $^{48}$Ca
with the CANDLES III system, which consists of CaF$_{2}$(pure) scintillators.
The first result of $^{48}$Ca double beta decay with the CANDLES III system
was obtained by using 130.4 days of data.
In this measurement,
we achieved a background free measurement
and a low background condition of 10$^{-3}$ events/keV/yr/(kg of $^{\rm nat.}$Ca).
The sensitivity of this measurement, however, was limited by the small amount of $^{48}$Ca.
For a more sensitive measurement of $^{48}$Ca 0$\nu\beta\beta$,
we have developed new techniques for $^{48}$Ca enrichment
and CaF$_{2}$ scintillating bolometer.
In this paper, we will also show the current status of these techniques.
DOI: https://doi.org/10.22323/1.380.0291
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