Study of Cosmogenic Neutron Production for $\sim$360 GeV Muons

arXiv - PHYS - High Energy Physics - Experiment Pub Date : 2024-09-06 DOI:arxiv-2409.04169

Xinshun Zhang, Jinjing Li, Shaomin Chen, Wei Dou, Haoyang Fu, Ye Liang, Qian Liu, Wentai Luo, Ming Qi, Wenhui Shao, Haozhe Sun, Jian Tang, Yuyi Wang, Zhe Wang, Changxu Wei, Jun Weng, Yiyang Wu, Benda Xu, Chuang Xu, Tong Xu, Yuzi Yang, Aiqiang Zhang, Bin Zhang

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Abstract

The China Jinping underground Laboratory (CJPL) is an excellent location for studying solar, terrestrial, and supernova neutrinos due to its 2400-meter vertical rock overburden. Its unparalleled depth gives an opportunity to investigate the cosmic-ray muons with exceptionally high average energy at $\sim360$ GeV. This paper details a study of muon-related backgrounds based on 1178 days of data collected by the 1-ton prototype neutrino detector used for the Jinping Neutrino Experiment (JNE) since 2017. The apparent effects of detectors' finite size on the measured result are first discussed in detail. The analysis of 493 cosmic-ray muon candidates and $13.6\pm5.7$ cosmogenic neutron candidates, along with a thorough evaluation of detection efficiency and uncertainties, gives a muon flux of $(3.56\pm0.16_{\mathrm{stat.}}\pm0.10_{\mathrm{syst.}})\times10^{-10}~\mathrm{cm}^{-2}\mathrm{s^{-1}}$ and a cosmogenic neutron yield of $(3.37\pm 1.41_{\mathrm{stat.}}\pm 0.31_{\mathrm{sys.}}) \times 10^{-4}~\mathrm{\mu}^{-1} \mathrm{g}^{-1} \mathrm{cm}^{2}$ in LAB-based liquid scintillator.

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360 GeV Μ介子的宇宙中子产生研究

中国锦屏地下实验室（CJPL）是研究太阳、地球和超新星中微子的绝佳地点，因为它有2400米垂直的岩石覆盖层。其无与伦比的深度为研究平均能量高达360 GeV的宇宙射线μ介子提供了机会。本文详细介绍了基于锦屏中微子实验（JNE）自2017年以来使用的1吨原型中微子探测器收集的1178天数据对μ介子相关背景的研究。通过对493个宇宙射线μ介子候选体和13.6/pm5.7$宇宙中子候选体的分析，以及对探测效率和不确定性的全面评估，得出μ介子通量为$(3.56pm0.16_{\mathrm{stat.}}\pm0.10_{\mathrm{syst.}})\times10^{-10}~\mathrm{cm}^{-2}\mathrm{s^{-1}}$ 和宇宙中子产率为 $(3.37\pm 1.41_{\mathrm{stat.}}\pm0.31_{\mathrm{sys.}}) \times 10^{-4}~\mathrm{mu}^{-1} \mathrm{g}^{-1}\mathrm{cm}^{2}$ in LAB-based liquid scintillator.

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arXiv - PHYS - High Energy Physics - Experiment

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