Open AccessStatus of 48Ca double beta decay search and its future prospect in CANDLES
Author(s) -
K. Tetsuno,
S. Ajimura,
K. Akutagawa,
T. Batpurev,
W. M. Chan,
K. Fushimi,
R. Hazama,
Tsutomu Iida,
Y. Ikeyama,
B. T. Khai,
T. Kishimoto,
K. K. Lee,
X. Li,
K. Matsuoka,
K. Matsuoka,
K. Mizukoshi,
Y. Mori,
K. Nakajima,
P. Noithong,
M. Nomachi,
Izumi Ogawa,
H. Ohsumi,
K. Ozawa,
Kiyotaka Shimizu,
M. Shokati,
F. Soberi,
K. Suzuki,
Y. Takemoto,
Y. Takihira,
Y. Tamagawa,
M. Tozawa,
V. T. T. Trang,
S. Umehara,
K. Yamamoto,
S. Yoshida,
I Kim,
Do Hoon Kwon,
H L Kim,
H J Lee,
M K Lee,
Y H Kim
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 - 10.1088/1742-6596/1468/1/012132
Subject(s) - scintillator , bolometer , double beta decay , physics , nuclear physics , spectrometer , radiochemistry , neutrino , isotope , beta (programming language) , analytical chemistry (journal) , chemistry , detector , optics , computer science , programming language , chromatography
CANDLES(CAlcium fluoride for the study of Neutrinos and Dark matters by Low Energy Spectrometer) is the experiment to search for the neutrino-less double beta decay(0 vββ ) of 48 Ca with CaF 2 scintillator. 48 Ca has the highest Q ββ -value (4.3 MeV) among all isotope candidates for 0 vββ . It enables us to measure signals with very low background condition. After rejection analysis with 131 days × 86 kg data for background events from radioactive contaminations in the CaF 2 scintillators, no events are observed in the Q ββ -value region. As a result, the half-life of 48 Ca is greater than 6.2 × 10 22 yr (90% confidence level). For further high sensitive measurement of 48 Ca 0 vββ search, we have been developing the 48 Ca enrichment and CaF 2 scintillating bolometer techniques. In this paper, the latest result for CANDLES and the status of scintillating bolometer development are described.