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ID 112417
著者
Iida, T Osaka University
Nakajima, K University of Fukui
Ajimura, S Osaka University
Batpurev, T Osaka University
Chan, W M Osaka University
Hazama, R Osaka Sangyo University
Kakubata, H Osaka University
Khai, B T Osaka University
Kishimoto, T Osaka University
Li, X Osaka University
Maeda, T Osaka University
Masuda, A University of Fukui
Matsuoka, K Osaka University
Morishita, K University of Fukui
Nakatani, N Osaka Sangyo University
Nomachi, M Osaka University
Noshiro, S University of Fukui
Ogawa, I University of Fukui
Ohata, T Osaka University
Osumi, H Saga University
Suzuki, K The Wakasa-wan energy research center
Tamagawa, Y University of Fukui
Tetsuno, K Osaka University
Trang, V T T Osaka University
Uehara, T Osaka University
Umehara, S Osaka University
Yoshida, S Osaka University
資料タイプ
学術雑誌論文
抄録
The observation of neutrino-less double beta decay (0νββ) would be the most practical way to prove the Majorana nature of the neutrino and lepton number violation. CANDLES studies 48Ca double beta decay using CaF2 scintillator. The main advantage of 48Ca is that it has the highest Q-value (4.27 MeV) among all the isotope candidates for 0νββ.
The CANDLES III detector is currently operating with 300kg CaF2 crystals in the Kamioka underground observatory, Japan. In 2014, a detector cooling system and a magnetic cancellation coil was installed with the aim to increase light emission of CaF2 scintillator and photo-electron collection efficiency of the photo-multipliers. After this upgrade, light yield was increased to 1000 p.e./MeV which is 1.6 times larger than before.
According to data analysis and simulation, main background source in CANDLES is turned out to be high energy external gamma-ray originating neutron capture on the surrounding materials, so called (n,γ). Upgrading the detector by installing neutron and gamma-ray shield can reduce the remaining main backgrounds by two order magnitude. In this report, we discuss the detail of (n,γ) and background reduction by additional shielding.
掲載誌名
Journal of Physics: Conference Series
ISSN
17426596
17426588
cat書誌ID
AA12839617
出版者
IOP Publishing
718
開始ページ
062026
発行日
2016-06-09
権利情報
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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言語
eng
著者版フラグ
出版社版
部局
理工学系