Background studies of high energy gamma rays from (n,gamma) reactions in the CANDLES experiment

• Material Type: 文書・図像類
• Title: Background studies of high energy gamma rays from (n,gamma) reactions in the CANDLES experiment
• Author/Editor: Nakajima, K.; Iida, T.; Akutagawa, K.; Batpurev, T.; Chan, W.M.; Dokaku, F.; Fushimi, K.; Kakubata, H.; Kanagawa, K.; Katagiri, S.; Kawasaki, K.; Khai, B.T.; Kino, H.; Kinoshita, E.; Kishimoto, T.; Hazama, R.; Hiraoka, H.; Hiyama, T.; Ishikawa, M.; Li, X.; Maeda, T.; Matsuoka, K.; Moser, M.; Nomachi, M.; Ogawa, I.; Ohata, T.; Sato, H.; Shamoto, K.; Shimada, M.; Shokati, M.; Takahashi, N.; Takemoto, Y.; Takihira, Y.; Tamagawa, Y.; Tozawa, M.; Teranishi, K.; Tetsuno, K.; Trangd, V.T.T.; Tsuzukid, M.; Umehara, S.; Wang, W.; Yoshida, S.; Yotsunaga, N.
• Author Heading: Nakajima, K.; Iida, T.; Akutagawa, K.; Batpurev, T.; Chan, W.M.; Dokaku, F.; Fushimi, K.; Kakubata, H.; Kanagawa, K.; Katagiri, S.; Kawasaki, K.; Khai, B.T.; Kino, H.; Kinoshita, E.; Kishimoto, T.; Hazama, R.; Hiraoka, H.; Hiyama, T.; Ishikawa, M.; Li, X.; Maeda, T.; Matsuoka, K.; Moser, M.; Nomachi, M.; Ogawa, I.; Ohata, T.; Sato, H.; Shamoto, K.; Shimada, M.; Shokati, M.; Takahashi, N.; Takemoto, Y.; Takihira, Y.; Tamagawa, Y.; Tozawa, M.; Teranishi, K.; Tetsuno, K.; Trangd, V.T.T.; Tsuzukid, M.; Umehara, S.; Wang, W.; Yoshida, S.; Yotsunaga, N.
• Publication, Distribution, etc.: Elsevier B.V.
• Publication Date: 2018-02-27
• Publication Date (W3CDTF): 2018-02-27
• Periodical title: Astroparticle physics
• No. or year of volume/issue: 100
• Volume: 100
• Pages: 54-60
• Text Language Code: eng
• Subject Heading: Double beta decay; (n,γ) reactions; Neutron capture; Neutron flux; Background studies
• Target Audience: 一般
• Note (General): High energy γrays with several MeV produced by (n,γ) reactions can be a trouble for low background measurements in the underground laboratories such as double beta decay experiments. In the CANDLES project, which aimed to observe the neutrino-less double beta decay from 48 Ca, γrays caused by (n,γ) reactions were found to be the most significant background. The profile of the background was studied by measurements with a neutron source and a simulation with a validity check of neutron processes in Geant4. The observed spectrum of γrays from (n,γ) reactions was well reproduced by the simulated spectra, which were originated from the surrounding rock and a detector tank made of stainless steel. The environmental neutron flux was derived by the observed event rate of γrays from (n,γ) reactions using the simulation. The thermal and non-thermal neutron flux were found to be (1.3±0.6)×10-6 cm -2 s -1 and (1.1±0.5)×10-5cm-2s-1, respectively. It is necessary to install an additional shield to reduce the background from (n,γ) reaction to the required level.
• Access Restrictions: 限定公開
• Rights (production): 〓 2018 The Authors. Published by Elsevier Ltd.
• Related Material (DOI): 10.1016/j.astropartphys.2018.02.012
• Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）; https://irdb.nii.ac.jp
• Original Data Provider (Database): 福井大学 : 福井大学学術機関リポジトリ