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

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Scintillator Physics Neutrino Double beta decay Beta decay Nuclear physics BETA (programming language) Half-life Beta particle Radiochemistry Analytical Chemistry (journal) Chemistry Detector Medicine Optics Pharmacokinetics Programming language Chromatography Internal medicine Computer science

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 , Toshihiro Ohata , K. Tetsuno , K. Lee , X. Lee , M. Shokati , B. Temuge , K. Akutagawa , K. Kanagawa , S. Katagiri , B. T. Khai , M. Tsuzuki , N. Yotsunaga , Michael Möser , Masahiro Ishikawa , H. Kino , E. Kinoshita , Yuki Sato , Y. Tamagawa , Izumi Ogawa , K. Nakajima , M. Tozawa , F. Dokaku , T. Hiyama , N. Takahashi , K. Teranishi , H. Hiraoka , K. Kawasaki , H. Sato , K. Shamoto , Miho Shimada , T. Iida , K. Fushimi , R. Hazama , K. Suzuki , H. Ohsumi ·

YOU? · · 2020 · Open Access · · DOI: https://doi.org/10.1088/1742-6596/1342/1/012049 · OA: W3000053350

We have studied the neutrino-less double beta decay(0νββ) of 48 Ca by using CaF 2 (pure) scintillators. Analysis for rejection of backgrounds( 212 Bi→ 212 Po events and 208 Tl 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 × 10 22 year (preliminary) for the half-life of 0νββ of 48 Ca.