Search for neutrino-less double beta decay of 48Ca-CANDLES

Autor:	S. Umehara, M. Nomachi, T. Kishimoto, S. Ajimura, Y. Takemoto, K. Tetsuno, K. Takihira, K. Matsuoka, V. T. T. Trang, S. Yoshida, M. Shokati, X. Li, T. Batpurev, B. T. Khai, K. Lee, K. Akutagawa, F. Soberi, K. Mizukoshi, K. Yamamoto, Y. Tamagawa, I. Ogawa, K. Nakajima, M. Tozawa, K. Shimizu, Y. Mori, Y. Ikeyama, K. Ozawa, T. Iida, K. Fushimi, R. Hazama, P. Noithong, K. Suzuki, H. Ohsumi
Rok vydání:	2020
Předmět:	Physics History Particle physics Double beta decay Neutrino Computer Science Applications Education
Zdroj:	Journal of Physics: Conference Series. 1643:012028
ISSN:	1742-6596 1742-6588
DOI:	10.1088/1742-6596/1643/1/012028
Popis:	We have studied the neutrino-less double beta decay(0νββ) of 48Ca with the CANDLES III system, which consists of CaF2(pure) scintillators. Rejection analyses for background events from radioactive contaminations in the CaF2(pure) scintillators were effective to reduce backgrounds in Qββ -value region. As the results, no events were observed in the region for the data of 131 days × 86 kg. It gave a lower limit 6.2 × 1022 year (90 % C.L.) for the half-life of 0νββ of 48Ca. For higher sensitive measurement of 48Ca 0νββ, we have developed new techniques for 48Ca enrichment and CaF2 scintillating bolometer. In this paper, we will also show current status of these techniques.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::dc55edc8b3daa6f7568235b00c01b23e https://doi.org/10.1088/1742-6596/1643/1/012028 Zobrazit plný text záznamu