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

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...

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Bibliographic Details
Published in:Journal of physics. Conference series 2020-01, Vol.1342 (1)
Main Authors: Umehara, S., Kishimoto, T., Nomachi, M., Ajimura, S., Takemoto, Y., Chan, W. M., Takihira, K., Matsuoka, K., Nakatani, N., Trang, V. T. T., Yoshida, S., Wang, W., Maeda, T., Ohata, T., Tetsuno, K., Lee, K., Lee, X., Shokati, M., Temuge, B., Akutagawa, K., Kanagawa, K., Katagiri, S., Khai, B. T., Tsuzuki, M., Yotsunaga, N., Moser, M., Ishikawa, M., Kino, H., Kinoshita, E., Sato, Y., Tamagawa, Y., Ogawa, I., Nakajima, K., Tozawa, M., Dokaku, F., Hiyama, T., Takahashi, N., Teranishi, K., Hiraoka, H., Kawasaki, K., Sato, H., Shamoto, K., Shimada, M., Iida, T., Fushimi, K., Hazama, R., Suzuki, K., Ohsumi, H.
Format: Article
Language:English
Subjects:
Beta decay
Calcium fluoride
Confidence intervals
Neutrinos
Physics
Scintillation counters
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Summary: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.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1342/1/012049