Open AccessNeutrino-less double beta decay of 48Ca studied by CaF2(pure) scintillators
Author(s) -
S. Umehara,
T. Kishimoto,
M. Nomachi,
S. Ajimura,
Y. Takemoto,
W. M. Chan,
K. Takihira,
K. Matsuoka,
Noboru Nakatani,
V. T. T. Trang,
S. Yoshida,
W. Wang,
Tsuyoshi Maeda,
Toshihiro Ohata,
K. Tetsuno,
K. Lee,
X. Lee,
M. Shokati,
B. Temuge,
K. Akutagawa,
K. Kanagawa,
S. Katagiri,
B. T. Khai,
M. Tsuzuki,
N. Yotsunaga,
Michael Möser,
Masahiro Ishikawa,
H. Kino,
E. Kinoshita,
Yuki Sato,
Y. Tamagawa,
Izumi Ogawa,
K. Nakajima,
M. Tozawa,
F. Dokaku,
T. Hiyama,
N. Takahashi,
K. Teranishi,
H. Hiraoka,
Kohei Kawasaki,
H. Sato,
K. Shamoto,
M. Shimada,
Tsutomu Iida,
K. Fushimi,
R. Hazama,
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 - 10.1088/1742-6596/1342/1/012049
Subject(s) - scintillator , physics , neutrino , double beta decay , nuclear physics , beta decay , beta (programming language) , limit (mathematics) , astrophysics , radiochemistry , chemistry , mathematics , detector , optics , computer science , programming language , mathematical analysis
We have studied the neutrino-less double beta decay(0νββ) of 48 Ca by using CaF 2 (pure) scintillators. Analysis for rejection of backgrounds( 212 Bi→ 212 Po events and 208 Tl events) was effective to reduce backgrounds in Qββ -value region. No events are observed in the Qββ -value region for the data of 131 days × 86 kg. It gives a lower limit (90% confidence level) of (math) > 6.2 × 10 22 year (preliminary) for the half-life of 0νββ of 48 Ca.