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4 results on '"B. Temuge"'

1. Search For Neutrino-less Double Beta Decay Of 48Ca- Candles

Author

M. Tsuzuki, S. Katagiri, N. Nakatani, Masaharu Nomachi, M. Washino, W. Wang, Tomohito Maeda, K. Teranishi, K. Mori, K. Morishita, Kiyokazu Nakajima, K. Tetsuno, B. T. Khai, Ken-Ichi Fushimi, T. Hiyama, S. Ajimura, Izumi Ogawa, Tadafumi Kishimoto, N. Yotsunaga, B. Temuge, X. Lee, Takashi Iida, Y. Tamagawa, F. Tokaku, T. Uehara, Saori Umehara, S. Noshiro, V. T. T. Trang, W. M. Chan, Sei Yoshida, K. Akutagawa, T. Ohata, N. Takahashi, K. Kanagawa, Hideaki Ohsumi, Y. Takemoto, Ryuta Hazama, K. Matsuoka, Kazuo Suzuki, and A. Masuda

Subjects
Physics, Neutron capture, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Double beta decay, Scintillation counter, Electromagnetic shielding, Underground laboratory, High Energy Physics::Experiment, Neutrino, Scintillator, Neutrino oscillation
Abstract

The neutrino-less double beta decay is acquiring great interest after the confirmation of neutrino oscillation which demonstrated nonzero neutrino mass. In order to search for neutrino-less double beta decay of $^{48}$Ca, we proposed the CANDLES project by using CaF$_{2}$(pure) scintillators. Now we installed the CANDLES III system at the Kamioka underground laboratory. The CANDLES III system realizes the low background condition by a characteristic structure and data analyses for background rejection. Furthermore we installed new shielding system in order to reduce $\gamma$-ray backgrounds from neutron capture reaction. Here we report performances of the CANDLES III system.

Published
2017
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2. Neutrino-less double beta decay of 48Ca studied by CaF2(pure) scintillators

Author

M. Shokati, X. Lee, B. T. Khai, K. Shamoto, Yoshinobu Sato, V. T. T. Trang, S. Ajimura, M. Tsuzuki, Masahiro Ishikawa, K. Tetsuno, N. Yotsunaga, K. Takihira, Takashi Iida, Tadafumi Kishimoto, B. Temuge, K. Lee, K. Teranishi, W. Wang, Y. Tamagawa, H. Hiraoka, Ken-Ichi Fushimi, K. Nakajima, Saori Umehara, M. Shimada, Ryuta Hazama, Masaharu Nomachi, N. Nakatani, M. Moser, K. Matsuoka, Toshihiro Maeda, Izumi Ogawa, H. Sato, S. Katagiri, H. Kino, Kazuo Suzuki, F. Dokaku, T. Hiyama, Y. Takemoto, K. Kanagawa, W. M. Chan, Sei Yoshida, K. Akutagawa, K. Kawasaki, T. Ohata, M. Tozawa, N. Takahashi, H. Ohsumi, and E. Kinoshita

Subjects
History, Particle physics, Double beta decay, Neutrino, Scintillator, Lower limit, Confidence interval, Computer Science Applications, Education
Abstract

We have studied the neutrino-less double beta decay(0νββ) of 48Ca by using CaF2(pure) scintillators. Analysis for rejection of backgrounds(212Bi→ 212Po events and 208Tl 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 × 1022 year (preliminary) for the half-life of 0νββ of 48Ca.

Published
2020
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3. Low background techniques in CANDLES

Author

M. Yoshizawa, X. Li, Kiyokazu Nakajima, W. M. Chan, Sei Yoshida, Masaharu Nomachi, Ken-Ichi Fushimi, T. Ohata, Tadafumi Kishimoto, B. Temuge, K. Sakamoto, V. T. T. Trang, N. Naktani, Ryuta Hazama, K. Matsuoka, Takashi Iida, K. Tetsuno, T. Uehara, T. Maeda, K. Morishita, Y. Tamagawa, Saori Umehara, Izumi Ogawa, H. Kakubata, and K. Suzuki

Subjects
Physics, Nuclear physics, Optics, business.industry, Double beta decay, Detector, High sensitive, business, Background radiation
Abstract

CANDLES is a double beta decay experiment using 48Ca in CaF2 crystals. The measurement is being performed with prototype detector (CANDLES III) for high sensitive measurement in the future. Recent status of detector improvements and background reduction techniques are described in this paper.

Published
2015
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