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

S. Umehara; T. Kishimoto; M. Nomachi; S. Ajimura; Y. Takemoto; W. M. Chan; K. Takihira; K. Matsuoka; N. Nakatani; V. T. T. Trang; S. Yoshida; W. Wang; W. M. Chan; T. Maeda; T. Ohata; K. Tetsuno; K. Lee; X. Lee; M. Shokati; B. Temuge; K. Akutagawa; K. Kanagawa; S. Katagiri; B. T. Khai; M. Tsuzuki; N. Yotsunaga; M. Moser; M. Ishikawa; H. Kino; E. Kinoshita; Y. Sato; Y. Tamagawa; I. Ogawa; K. Nakajima; M. Tozawa; F. Dokaku; T. Hiyama; N. Takahashi; K. Teranishi; H. Hiraoka; K. Kawasaki; H. Sato; K. Shamoto; M. Shimada; T. Iida; K. Fushimi; R. Hazama; K. Suzuki; H. Ohsumi

doi:10.1088/1742-6596/1342/1/012049

Journal of Physics: Conference Series

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

S. Umehara^1,2, T. Kishimoto^2,3, M. Nomachi², S. Ajimura², Y. Takemoto², W. M. Chan², K. Takihira², K. Matsuoka², N. Nakatani², V. T. T. Trang², S. Yoshida³, W. Wang³, W. M. Chan³, T. Maeda³, T. Ohata³, K. Tetsuno³, K. Lee³, X. Lee³, M. Shokati³, B. Temuge³, K. Akutagawa³, K. Kanagawa³, S. Katagiri³, B. T. Khai³, M. Tsuzuki³, N. Yotsunaga³, M. Moser³, M. Ishikawa³, H. Kino³, E. Kinoshita³, Y. Sato³, Y. Tamagawa⁴, I. Ogawa⁴, K. Nakajima⁴, M. Tozawa⁴, F. Dokaku⁴, T. Hiyama⁴, N. Takahashi⁴, K. Teranishi⁴, H. Hiraoka⁴, K. Kawasaki⁴, H. Sato⁴, K. Shamoto⁴, M. Shimada⁴, T. Iida⁵, K. Fushimi⁶, R. Hazama⁷, K. Suzuki⁸ and H. Ohsumi⁹

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Journal of Physics: Conference Series, Volume 1342, XV International Conference on Topics in Astroparticle and Underground Physics 24–28 June 2017, Sudbury, ON, Canada Citation S. Umehara et al 2020 J. Phys.: Conf. Ser. 1342 012049 DOI 10.1088/1742-6596/1342/1/012049

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umehara@awa.tohoku.ac.jp

Author affiliations

¹ Research Center for Neutrino Science, Tohoku University, Japan

² Research Center for Nuclear Physics, Osaka University, Japan

³ Graduate School of Science, Osaka University, Japan

⁴ Graduate School of Engineering, University of Fukui, Japan

⁵ Faculty of Pure and Applied Sciences, University of Tsukuba, Japan

⁶ Faculty of Integrated Arts and Science, The University of Tokushima, Japan

⁷ Faculty of Human Environment, Osaka Sangyo University, Japan

⁸ The Wakasa-wan Energy Research Center, Japan

⁹ Faculty of Culture and Education, Saga University, Japan

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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.

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