AI 中文总结
本研究利用DEAP-3600实验测量SNOLAB处缪子通量，通过符合分析得到其通量值，结果与SNO实验及MUTE软件模拟相符，为稀有事例搜寻提供重要基准。
AI 中文摘要
本研究利用位于加拿大萨德伯里附近SNOLAB地下2公里处的DEAP-3600实验，对SNOLAB处的缪子通量进行直接测量。DEAP-3600的主要设计目标是直接探测弱相互作用大质量粒子（WIMPs），这是一种暗物质候选粒子，其结构包含一个内部球形丙烯酸容器，内装液态氩靶；该容器被封闭在一个钢壳中，钢壳浸没于带探测设备的水箱内，作为暗物质搜寻的缪子反符合探测器。缪子通量测量采用事例的切割计数分析，这些事例包括缪子反符合探测器中观测到的事例，以及缪子反符合探测器与液态氩靶之间的符合事例。要求缪子同时穿过水和液态氩，可最大程度降低仪器本底和系统不确定性。利用2016年11月至2020年3月采集的数据，通过该符合分析测得缪子通量为(3.71±0.25统计±0.09系统)×10^-10缪子/平方厘米/秒。仅用缪子反符合探测器数据的独立测量结果在不确定度范围内与之一致，且两次测量结果均与SNO实验的先前结果及使用MUTE软件开展的模拟结果相符。这些结果为SNOLAB设施未来的稀有事例搜寻提供了重要基准。
英文摘要
A direct measurement of the muon flux at SNOLAB is performed using the DEAP-3600 experiment, located 2 km underground at SNOLAB near Sudbury, Canada. Primarily designed for the direct detection of weakly interacting massive particles (WIMPs), a dark matter candidate, DEAP-3600 consists of an inner spherical acrylic vessel containing a liquid argon target; this vessel is enclosed within a steel shell which is submerged in an instrumented water tank, serving as a muon veto for the dark matter search. The muon flux measurement is performed using a cut-and-count analysis of events observed in the muon veto detector and of events which are coincident between the muon veto and the liquid argon target. The requirement that muons traverse both the water and liquid argon minimizes instrumental backgrounds and systematic uncertainties. Using data collected from November 2016 to March 2020, the muon flux is measured by this coincidence analysis to be $(3.71 \pm 0.25_{\textrm{stat}} \pm 0.09_{\textrm{sys}}) \times 10^{-10}\, μ/$cm$^2$/s. The standalone measurement using muon veto data only is compatible within uncertainties. Both measurements agree with the previous result by the SNO experiment and with simulations carried out using the MUTE software. These results provide an important benchmark for future rare-event searches at the SNOLAB facility.
Comments10 pages, 7 figures
