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Search for neutrinoless quadruple beta decay of 136Xe in XMASS-I
Physics Letters B ( IF 4.3 ) Pub Date : 2022-07-28 , DOI: 10.1016/j.physletb.2022.137355
K. Abe , K. Hiraide , K. Ichimura , N. Kato , Y. Kishimoto , K. Kobayashi , M. Kobayashi , S. Moriyama , M. Nakahata , K. Sato , H. Sekiya , T. Suzuki , A. Takeda , S. Tasaka , M. Yamashita , B.S. Yang , N.Y. Kim , Y.D. Kim , Y.H. Kim , R. Ishii , Y. Itow , K. Kanzawa , K. Masuda , K. Martens , A. Mason , Y. Suzuki , K. Miuchi , Y. Takeuchi , K.B. Lee , M.K. Lee , Y. Fukuda , H. Ogawa , K. Nishijima , K. Fushimi , B.D. Xu , S. Nakamura

A search for the neutrinoless quadruple beta decay of 136Xe was conducted with the liquid-xenon detector XMASS-I using 327 kg ×800.0 days of the exposure. The pulse shape discrimination based on the scintillation decay time constant which distinguishes γ-rays including the signal and β-rays was used to enhance the search sensitivity. No significant signal excess was observed from the energy spectrum fitting with precise background evaluation, and we set a lower limit of the half life of 3.7 × 1024 years at 90% confidence level. This is the first experimental constraint of the neutrinoless quadruple beta decay of 136Xe.



中文翻译:

在 XMASS-I 中寻找 136Xe 的无中微子四倍 β 衰变

使用液体氙探测器 XMASS-I 进行了136 Xe的无中微子四倍β衰变的搜索,曝光时间为 327 kg × 800.0 天。基于闪烁衰减时间常数的脉冲形状鉴别用于区分包括信号的γ射线和β射线,用于提高搜索灵敏度。从具有精确背景评估的能谱拟合中没有观察到显着的信号过量,我们在 90% 的置信水平下设定了 3.7 × 10 24年的半衰期下限。这是136 Xe 的无中微子四倍β衰变的第一个实验约束。

更新日期:2022-07-28
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