论文标题
$^{136} $ XE的双β衰减半衰期的测量与Pandax-4T检测器
Measurement of Double Beta Decay Half-life of $^{136}$Xe with the PandaX-4T Detector
论文作者
论文摘要
两次中性β衰减(DBD)半衰期的精确测量是搜索具有中微子双β衰变的主要中微子的重要一步。我们使用PANDAX-4T双相时间投影室(TPC)报告了$^{136} $ XE的DBD半衰期的测量值,其最初的94.9天物理数据发布。基准体积中的背景模型受外部活性区域中的事件的限制。 $^{136} $ XE暴露于15.5 kg年,我们将半衰期建立为$ 2.27 \ pm 0.03(stat。)\ pm 0.10(Syst。)\ times 10^{21} $年。这是使用天然氙气的第一个DBD半衰期测量值,它在罕见事件搜索领域展示了大规模液体氙气TPC的物理能力。
Precise measurement of two-neutrino double beta decay (DBD) half-life is an important step for the searches of Majorana neutrinos with neutrinoless double beta decay. We report the measurement of DBD half-life of $^{136}$Xe using the PandaX-4T dual-phase Time Projection Chamber (TPC) with 3.7-tonne natural xenon and the first 94.9-day physics data release. The background model in the fiducial volume is well constrained in situ by events in the outer active region. With a $^{136}$Xe exposure of 15.5 kg-year, we establish the half-life as $2.27 \pm 0.03 (stat.)\pm 0.10 (syst.)\times 10^{21}$ years. This is the first DBD half-life measurement with natural xenon and demonstrates the physics capability of a large-scale liquid xenon TPC in the field of rare event searches.