Development of Scintillating Bolometer with Large Undoped and Eu-doped CaF2 Crystals for Neutrinoless Double Beta Decay of 48Ca
| Main Authors: | Saori Umehara, H.L. Kim, H.J. Lee, Konosuke Tetsuno, Tadafumi Kishimoto, Minkyu Lee, Sei Yoshida, Yong-Hamb Kim, D.H. Kwon, Xiaolong Li, Inwook Kim |
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| Format: | Proceeding poster Journal |
| Terbitan: |
, 2020
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| Online Access: |
https://zenodo.org/record/4122970 |
Daftar Isi:
- We are developing CaF$_2$ scintillating bolometers to search for for neutrinoless double beta decay of $^{48}$Ca. We realized large scintillating bolometers using 312g(50mm$\phi$ $\times$ 50mm cylinder) of undoped and Europium-doped CaF$_2$ crystals with a readout technology of metallic magnetic calorimeters. We used CaF$_2$ crystals with a large amount of internal $^{238}$U-series impurities to evaluate detector performance such as energy resolution and particle identification. We found that the thermal signal amplitudes are strongly position-dependent in both CaF$_2$ crystals. By analyzing the sequential alpha-decays (222Rn-218Po-214Pb), the energy resolution without position dependence was evaluated, and obtained to be 0.2% at 5MeV, in the case of undoped CaF$_2$ crystal. In the poster presentation, we will present the results obtained with this R&D measurements.