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5 results on '"G Ito"'

1. Search for neutrino-less double beta decay by CANDLES

Author

S. Umehara, T. Kishimoto, M. Nomachi, S. Yoshida, S. Ajimura, K. Suzuki, K. Ichimura, K. Matsuoka, N. Nakatani, G. Ito, H. Kakubata, M. Saka, W. Wang, J. Takemoto, W. Chan, M. Doihara, Y. Tamagawa, I. Ogawa, S. Ueno, S. Maeda, A. Yamamoto, S. Tomita, G. Fujita, A. Kawamura, T. Harada, K. Fushimi, R. Hazama, H. Ohsumi, and K. Okada

Published
2013

2. Search for neutrino-less double beta decay with CANDLES

Author

S. Maeda, Koichi Ichimura, N. Nakatani, Saori Umehara, W. M. Chan, K. Okada, A. Kawamura, S. Tomita, W. Wang, G. Fujita, H. Kakubata, T. Harada, Ken-Ichi Fushimi, A. Yamamoto, Masaharu Nomachi, Tadafumi Kishimoto, J. Takemoto, Ryuta Hazama, S. Ueno, K. Suzuki, Izumi Ogawa, S. Ajimura, K. Matsuoka, Y. Tamagawa, M. Doihara, G. Ito, Sei Yoshida, M. Saka, and H. Ohsumi

Subjects
Physics, Nuclear physics, MAJORANA, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Double beta decay, High Energy Physics::Phenomenology, Detector, High Energy Physics::Experiment, Astrophysics::Cosmology and Extragalactic Astrophysics, Neutrino
Abstract

CANDLES is the project to search for neutrino-less double beta decay (0νββ) of βCa. The observation of 0νββ will prove existence of a massive Majorana neutrino. Now we installed new detector system CANDLES III. Here expected performances of the system for background rejection are presented. It is also described current status of development for the detector system.

Published
2012

3. Low radioactivity CaF[sub 2] scintillator crystals for CANDLES

Author

Yoichi Tamagawa, Izumi Ogawa, Tadafumi Kishimoto, K. Fushimi, H. Kakubata, K. Yasuda, G. Ito, M. Nomachi, M. Miyashita, K. Matsuoka, Saori Umehara, R. Hazama, S. Yoshida, H. Ohsumi, and K. Okada

Subjects
Physics, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Dark matter, Astrophysics::Cosmology and Extragalactic Astrophysics, Scintillator, Nuclear physics, Massless particle, MAJORANA, Double beta decay, High Energy Physics::Experiment, Neutrino, Radioactive decay, Lepton
Abstract

CANDLES is the project to search for neutrinoless double beta (0νββ) decay of 48Ca by using CaF2 scintillators. The observation of 0νββ decay will prove the existence of massive Majorana neutrinos. Expected performances and current status of the CANDLES system are described.

Published
2011

4. Neutrino-less Double Beta Decay of [sup 48]Ca -CANDLES

Author

T. Kishimoto, S. Yoshida, K. Matsuoka, K. Ichimura, G. Ito, K. Yasuda, H. Kakubata, M. Miyashita, K. Takubo, M. Nomachi, M. Saka, K. Seki, S. Ajimura, S. Umehara, N. Nakatani, Y. Tamagawa, I. Ogawa, K. Fushimi, R. Hazama, H. Ohsumi, K. Okada, Y. Fujii, Atsushi Hosaka, Kanchan Khemchandani, Hideko Nagahiro, and Kanabu Nawa

Subjects
Physics, Particle physics, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Lepton number, Massless particle, Nuclear physics, MAJORANA, Double beta decay, CP violation, High Energy Physics::Experiment, Neutrino, Radioactive decay, Lepton
Abstract

Neutrino‐less double beta decay (0νββ) is currently known to be an only experiment to verify whether lepton number is conserved or not. The lepton number non‐conservation is the key to create matter dominated universe with CP violation. The so‐called leptogenesys scenario presents a way to create the matter dominated universe by these violations. If neutrinos have Majorana mass, transition from a particle to an anti‐particle is possible and the left‐handed and right‐handed neutrinos could have different masses. It is highly likely that the neutrinos are Majorana particles. We have been studying double beta decay of 48Ca. Our first stage experiment using the ELEGANT VI detector system gave the best lower limit of the half life of 0νββ of 48Ca. We have been working on CANDLES detector system to sense much longer lifetime region. We have developed techniques to reduce backgrounds. The CADLES detector system was installed at Kamioka underground laboratory. Here I describe a schematic view of the system.

Published
2011

5. Study of Double Beta Decay of [sup 48]Ca by CANDLES

Author

S. Umehara, T. Kishimoto, I. Ogawa, K. Matsuoka, G. Ito, K. Yasuda, H. Kakubata, M. Miyashita, M. Nomachi, S. Ajimura, Y. Tamagawa, K. Fushimi, R. Hazama, H. Ohsumi, K. Okada, S. Yoshida, Y. Fujii, Akira Ozawa, and Weiping Lu

Subjects
Physics, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, Astrophysics::Cosmology and Extragalactic Astrophysics, Beta decay, Nuclear physics, MAJORANA, Double beta decay, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Radioactive decay, Lepton
Abstract

CANDLES is the project to search for neutrino‐less double beta decay (0νββ) of 48Ca. The observation of 0νββ will prove existence of a massive Majorana neutrino. We have developed the new detector system CANDLES which features CaF2 (pure) scintillators. Here expected performances of the system for background rejection are presented. It is also described current status of development for the detector system.

Published
2010

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