Open AccessStudy of a Large CaF2(Eu) Scintillating Bolometer for Neutrinoless Double Beta Decay
Author(s) -
X Li,
Do Hoon Kwon,
K. Tetsuno,
I Kim,
H L Kim,
H J Lee,
S. Yoshida,
Y H Kim,
M K Lee,
S. Umehara,
T. Kishimoto
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1468/1/012116
Subject(s) - bolometer , double beta decay , physics , scintillation , amplitude , crystal (programming language) , nuclear physics , ion , optics , neutrino , detector , quantum mechanics , computer science , programming language
Scintillating bolometer is a powerful tool to search neutrinoless double beta decay. We established a large scintillating bolometer using a 312 g CaF 2 (Eu) crystal with a readout technology of metallic magnetic calorimeters. A set of successful measurements were carried out for simultaneous detection for heat and light signals at 10-40 mK in an above-ground laboratory. We found large light signals with clear difference in scintillation yields between electron- and alpha-induced events. The comparison of relative amplitudes of heat and light signals obtained about 10 σ discrimination power. We also found the heat signals experiencing strong position dependence from the event location. This position dependence can be interpreted by the spin-lattice interaction of paramagnetic Eu ions in the CaF 2 crystal.