六边形BC404闪烁体的固有时间分辨率：相互作用几何与光学反射率的蒙特卡罗研究

中文摘要 AI 辅助

时间分辨率是粒子探测器中的一个重要参数，因为它决定了探测器区分两个时间上分离事件的能力。时间分辨率可分解为电子学贡献和固有贡献，其中固有贡献受闪烁、光学输运、探测器几何结构、粒子类型与能量以及光传感器灵敏面积的影响。在本工作中，基于Geant4的蒙特卡罗模拟被用于研究六边形BC404塑料闪烁体的固有时间分辨率。分析包括评估六边形表面上的光学光子分布，以及表征不同相互作用构型下的固有时间分辨率。使用能量范围从4 GeV到1 TeV的μ子作为宇宙射线代理来研究固有时间分辨率。此外，研究了表面反射率对光学光子输运和时间性能的影响，反射率范围从0%到100%。结果表明，固有时间分辨率对入射μ子能量的依赖性很小，而观察到对相互作用位置的明显依赖性。此外，尽管探测到的光子数量随相互作用位置和表面反射率变化，但固有时间分辨率并非仅由光子统计决定，表明光学输运和几何效应在时间性能中起重要作用。在所研究的构型中，获得的固有时间分辨率范围约为15到100 ps。这些发现强调了相互作用位置、光学输运、光子统计和表面反射率在决定六边形塑料闪烁体时间性能中的重要性，并为优化其光学特性和几何结构以用于时间敏感应用提供了指导。

英文摘要

Time resolution is an important parameter in particle detectors, as it determines their ability to distinguish between two temporally separated events. It can be decomposed into electronic and intrinsic contributions, the latter being influenced by scintillation, optical transport, detector geometry, particle type and energy, and the sensitive area of the photosensor. In this work, a Monte Carlo simulation based on Geant4 is used to investigate the intrinsic time resolution of a hexagonal BC404 plastic scintillator. The analysis includes the evaluation of the optical-photon distribution over the hexagonal surfaces and the characterization of the intrinsic time resolution for different interaction configurations. The intrinsic time resolution is investigated using muons as cosmic-ray proxies with energies ranging from 4~GeV to 1~TeV. In addition, the effect of surface reflectivity on optical-photon transport and timing performance is studied for reflectivities ranging from 0\% to 100\%. The results show that the intrinsic time resolution exhibits little dependence on the incident muon energy, while a clear dependence on the interaction position is observed. Furthermore, although the number of detected photons varies with the interaction position and surface reflectivity, the intrinsic time resolution is not solely determined by photon statistics, indicating that optical transport and geometrical effects play an important role in the timing performance. Across the investigated configurations, intrinsic time resolutions ranging from approximately 15 to 100~ps are obtained. These findings highlight the importance of the interaction position, optical transport, photon statistics, and surface reflectivity in determining the timing performance of hexagonal plastic scintillators and provide guidance for the optimization of their optical properties and geometry for timing-sensitive applications.

发表机构

• Secretaría de Ciencia, Humanidades, Tecnología e Innovación（科学技术人文与创新秘书处）
• Facultad de Ciencias Físico Matemáticas, Benemérita Universidad Autónoma de Puebla（普埃布拉自治大学物理数学科学学院）

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