论文标题
中国的MUON通量测量地下实验室
Muon Flux Measurement at China Jinping Underground Laboratory
论文作者
论文摘要
中国的地下实验室（CJPL）是研究太阳，地理和超新星中微子的理想选择。对宇宙射线背景的精确度量将在进行这些MEV规模中微子实验的R \＆D研究中起着至关重要的作用。使用1吨原型检测器进行Jinping Neutmino实验（jne），我们在CJPL（CJPL-I）的第一阶段（CJPL-I）的645.2天数据集中检测了264个高能量的哑光事件，重建了他们的方向，并测量了宇宙射线摩恩的磁通量$（3.53 \ pm0.22 _ {\ text {stat。}} \ pm0.07 _ {\ text {sys。}}）\ times10^{ - 10} $ cm $^{ - 2} $ s $ s $ s $ s $^{ - 1} $。观察到的角度分布表明宇宙射线哑光背景的泄漏，并同意对山山的地形进行的模拟。对位于山脉下方和矿井下方的不同实验室位置的MUON通量进行的调查表明，前者通常比后者大的$（4 \ pm2）$（4 \ pm2）$大。这项研究为地下实验的MUON通量提供了方便的后面估计。
China Jinping Underground Laboratory (CJPL) is ideal for studying solar-, geo-, and supernova neutrinos. A precise measurement of the cosmic-ray background would play an essential role in proceeding with the R\&D research for these MeV-scale neutrino experiments. Using a 1-ton prototype detector for the Jinping Neutrino Experiment (JNE), we detected 264 high-energy muon events from a 645.2-day dataset at the first phase of CJPL (CJPL-I), reconstructed their directions, and measured the cosmic-ray muon flux to be $(3.53\pm0.22_{\text{stat.}}\pm0.07_{\text{sys.}})\times10^{-10}$ cm$^{-2}$s$^{-1}$. The observed angular distributions indicate the leakage of cosmic-ray muon background and agree with the simulation accounting for Jinping mountain's terrain. A survey of muon fluxes at different laboratory locations situated under mountains and below mine shaft indicated that the former is generally a factor of $(4\pm2)$ larger than the latter with the same vertical overburden. This study provides a convenient back-of-the-envelope estimation for muon flux of an underground experiment.
