Open AccessSearch for neutrino-less double beta decay of 48Ca-CANDLES-
Author(s) -
S. Umehara,
M. Nomachi,
T. Kishimoto,
S. Ajimura,
Y. Takemoto,
K. Tetsuno,
K. Takihira,
K. Matsuoka,
V. T. T. Trang,
S. Yoshida,
M. Shokati,
X. Li,
T. Batpurev,
B. T. Khai,
K. Lee,
K. Akutagawa,
F. Soberi,
K. Mizukoshi,
K. Yamamoto,
Y. Tamagawa,
Izumi Ogawa,
K. Nakajima,
M. Tozawa,
Kiyotaka Shimizu,
Kiyotaka Shimizu,
Y. Mori,
Y. Ikeyama,
K. Ozawa,
K. Matsuoka,
Tsutomu Iida,
K. Fushimi,
R. Hazama,
P. Noithong,
K. Suzuki,
H. Ohsumi
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 - 10.1088/1742-6596/1643/1/012028
Subject(s) - scintillator , physics , double beta decay , bolometer , neutrino , nuclear physics , radiochemistry , beta (programming language) , beta decay , beta particle , analytical chemistry (journal) , chemistry , detector , optics , environmental chemistry , programming language , computer science
We have studied the neutrino-less double beta decay(0 νββ ) of 48 Ca with the CANDLES III system, which consists of CaF 2 (pure) scintillators. Rejection analyses for background events from radioactive contaminations in the CaF 2 (pure) scintillators were effective to reduce backgrounds in Q ββ -value region. As the results, no events were observed in the region for the data of 131 days × 86 kg. It gave a lower limit 6.2 × 10 22 year (90 % C.L.) for the half-life of 0 νββ of 48 Ca. For higher sensitive measurement of 48 Ca 0 νββ , we have developed new techniques for 48 Ca enrichment and CaF 2 scintillating bolometer. In this paper, we will also show current status of these techniques.