论文标题
Muon诱导的背景在基于液体氙的下一代暗物质实验中
Muon-induced background in a next-generation dark matter experiment based on liquid xenon
论文作者
论文摘要
在罕见的事件搜索实验中，muon诱导的中子可以导致潜在的不可还原背景。我们已经研究了实验室深度对能够达到所谓中微子地板的未来暗物质实验中的感应背景的含义。我们的仿真研究集中于具有71吨活跃质量的基于氙气的检测器，周围是包括仪器的其他否决系统。布尔比地下实验室（英国）的两个地点是案例研究：盐中的实验性洞穴，深度为2850 m W.E. （类似于现有实验室的位置），还有一个更深的实验室，位于多面岩石的深度为3575 M W.E.我们的结果表明，不到一个宇宙背景的事件可能会在两个位置进行10年运行的标准分析削减。我们确定的最大背景组件来自$^{17} $ n的延迟中子排放，该发射来自实验的荧光聚合物组件中$^{19} $ f。我们的结果证实，在这些岩石覆盖层的水平上，地下实验室中，对中微子地板敏感的暗物质搜索是可行的（从宇宙背景的角度来看）。我们介绍了执行的模拟和获得的结果的详细信息。
Muon-induced neutrons can lead to potentially irreducible backgrounds in rare event search experiments. We have investigated the implication of laboratory depth on the muon induced background in a future dark matter experiment capable of reaching the so-called neutrino floor. Our simulation study focuses on a xenon-based detector with 71 tonnes of active mass, surrounded by additional veto systems including an instrumented water shield. Two locations at the Boulby Underground Laboratory (UK) served as a case study: an experimental cavern in salt at a depth of 2850 m w.e. (similar to the location of the existing laboratory), and a deeper laboratory located in polyhalite rock at a depth of 3575 m w.e. Our results show that less than one event of cosmogenic background is likely to survive standard analysis cuts for 10 years of operation at either location. The largest background component that we identified comes from delayed neutron emission from $^{17}$N which is produced from $^{19}$F in the fluoropolymer components of the experiment. Our results confirm that a dark matter search with sensitivity to the neutrino floor is viable (from the point of view of cosmogenic backgrounds) in underground laboratories at these levels of rock overburden. We present details of the performed simulations and of the obtained results.
