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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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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.
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container_title Journal of physics. Conference series
container_volume 1342
creator 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.
Chan, W. M.
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.
description 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.
doi_str_mv 10.1088/1742-6596/1342/1/012049
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subjects Beta decay
Calcium fluoride
Confidence intervals
Neutrinos
Physics
Scintillation counters
title Neutrino-less double beta decay of 48Ca studied by CaF2(pure) scintillators
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