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arXiv 2407.17868physics.ins-det
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J-PARC强子实验设施束流收集器后方μ子通量的测量

Measurement of muon flux behind the beam dump of the J-PARC Hadron Experimental Facility

T. Matsumura, Y. Hirayama, G. Y. Lim, H. Nanjo, T. Nomura, K. Shiomi, H. Watanabe

AI总结:

本文使用可放入地下观测孔的紧凑型塑料闪烁体μ子探测器,垂直扫描测量J-PARC束流收集器后的μ子通量,结果在距束流轴1 m外与蒙特卡罗模拟一致,可服务KOTO II信号损失评估和辐射屏蔽计算。

摘要:

利用一台可插入地下挖掘的直径81 mm垂直观测孔中的紧凑型μ子探测器,对J-PARC强子实验设施束流收集器后方的μ子通量进行了测量。该探测器由12根长度均为80 mm的塑料闪烁条组成,这些闪烁条以圆柱形排列,并容纳在外径为75 mm的铝制外壳内。每根闪烁条的末端耦合一个硅光电倍增管,用于收集闪烁光。对穿透束流收集器的μ子通量以0.5 m的间隔进行了垂直扫描,结果显示其分布较宽,并在束流高度处达到最大值。在距离束流轴1 m以上的位置,μ子通量与蒙特卡罗模拟的预期相符;该模拟预期将用于未来旨在测量稀有K介子衰变的KOTO II实验中的信号损失评估。这些数据还可用于提高辐射防护中屏蔽计算的精度。

英文摘要:

A muon-flux measurement behind the beam dump of the J-PARC Hadron Experimental Facility was performed with a compact muon detector that can be inserted into a vertical observing hole with 81 mm in diameter which was dug underground. The detector consists of 12 plastic scintillation strips with a length of 80 mm each, which are arranged with cylindrical shape and contained inside an aluminum housing with an outer diameter of 75 mm. A silicon photomultiplier is coupled to the end of each strip to collect the scintillating light. The flux of the muons penetrating the beam dump was scanned vertically at intervals of 0.5 m, showing a wide distribution with a maximum at the beam level. The muon flux was consistent with the expectation from a Monte-Carlo simulation at more than 1 m away from the beam axis, which is expected to be used for signal-loss evaluation in the future KOTO II experiment for measuring rare kaon decays. The data can also be used in improving the accuracy of shielding calculations in the radiation protection.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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