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关于MAGRO的中子检测特性的模拟研究:基于BC-408的大型中子探测器

Pilsoo Lee¹, Atsuko Odahara², Tadashi Shimoda²

¹Nuclear Physics Application Research Division, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea and Radiation Science, University of Science and Technology, Daejeon 34057, Republic of Korea.

The Review of scientific instruments

|July 21, 2025

概括

在核物理实验中,MAGRO探测器有效地计数低能中子. 使用GEANT4的模拟准确地复制了飞行时间谱,使得分散中子的识别成为可能.

科学领域:

核物理核物理核物理
实验核物理实验核物理
探测器物理物理

背景情况:

核物理中的中子测量依赖于飞行时间 (TOF) 谱学.
散射中子使TOF频谱分析复杂化,需要方法来区分直接和外散射组件.
研究罕见的同位素β延迟中子衰变需要精确检测低能中子.

研究的目的:

为了证明MAGRO大面积中子探测器对于低能中子探测 (低至300keV) 的实用性.
为了验证蒙特卡洛模拟 (GEANT4) 检测器响应和TOF频谱分析.
开发一种用于在β延迟中子衰变研究中识别外散射中子事件的方法.

主要方法:

使用GEANT4的蒙特卡洛模拟,结合光学和高精度中子物理模型.
调整了光学物理参数,以匹配光衰减和传播时间的实验数据.
通过在HIMAC和RCNP使用16C和17N束进行效率和TOF测量的内束测试,验证了模拟代码.

主要成果:

马格罗探测器证明了计算低能中子的能力,低至300keV.
模拟准确地复制了TOF光谱,验证了探测器的响应.
单个MAGRO探测器 (200 keV到7 MeV) 的计算中子效率与2 MeV以下的测量数据有很好的一致性.

结论:

在核衰变研究中,MAGRO探测器有效用于低能中子探测.
GEANT4模拟为分析TOF光谱和理解中子散射提供了可靠的工具.
模拟方法提供了一种独特的方法,在复杂的实验设置中识别出分散的中子.

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