In-beam gamma rays of CSNS Back-n characterized by black resonance filter

IF 3.6 1区 物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY
Jin-Cheng Wang, Jie Ren, Wei Jiang, Xi-Chao Ruan, Ying-Yi Liu, Hao-Lan Yang, Kuo-Zhi Xu, Xin-Yi Pan, Qi Sun, Jie Bao, Han-Xiong Huang, Hao-Fan Bai, Jiang-Bo Bai, Ping Cao, Qi-Ping Chen, Yong-Hao Chen, Wen-Hao Duan, An-Chuan Fan, Rui-Rui Fan, Chang-Qing Feng, Min-Hao Gu, Chang-Cai Han, Zi-Jie Han, Guo-Zhu He, Yong-Cheng He, Yang Hong, Yi-Wei Hu, Zhi-Jie Jiang, Ling Kang, Chang-Lin Lan, Bo Li, Feng Li, Qiang Li, Xiao Li, Yang Li, Jie Liu, Rong Liu, Shu-Bin Liu, Yi-Na Liu, Guang-Yuan Luan, Chang-Jun Ning, Yi-Jia Qiu, Wen-Kai Ren, Zhi-Zhou Ren, Zhao-Hui Song, Kang Sun, Zhi-Xin Tan, Jing-Yu Tang, Sheng-Da Tang, Li-Jiao Wang, Peng-Cheng Wang, Zhao-Hui Wang, Zhong-Wei Wen, Xiao-Guang Wu, Xuan Wu, Ze-Peng Wu, Cong Xia, Li-Kun Xie, Han Yi, Tao Yu, Yong-Ji Yu, Guo-Hui Zhang, Hang-Chang Zhang, Qi-Wei Zhang, Xian-Peng Zhang, Yu-Liang Zhang, Zhi-Yong Zhang, Mao-Yuan Zhao, Zhi-Hao Zhou, Ke-Jun Zhu, Chong Zou
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引用次数: 0

Abstract

The back-streaming white-neutron beamline (Back-n) of the China Spallation Neutron Source is an essential neutron-research platform built for the study of nuclear data, neutron physics, and neutron applications. Many types of cross-sectional neutron-reaction measurements have been performed at Back-n since early 2018. These measurements have shown that a significant number of gamma rays can be transmitted to the experimental stations of Back-n along with the neutron beam. These gamma rays, commonly referred to as in-beam gamma rays, can induce a non-negligible experimental background in neutron-reaction measurements. Studying the characteristics of in-beam gamma rays is important for understanding the experimental background. However, measuring in-beam gamma rays is challenging because most gamma-ray detectors are sensitive to neutrons; thus, discriminating between neutron-induced signals and those from in-beam gamma rays is difficult. In this study, we propose the use of the black resonance filter method and a \(\hbox {CeBr}_{3}\) scintillation detector to measure the characteristics of the in-beam gamma rays of Back-n. Four types of black resonance filters, 181Ta, 59Co, natAg, and natCd, were used in this measurement. The time-of-flight (TOF) technique was used to select the detector signals remaining in the absorption region of the TOF spectra, which were mainly induced by in-beam gamma rays. The energy distribution and flux of the in-beam gamma rays of Back-n were determined by analyzing the deposited energy spectra of the \(\hbox {CeBr}_{3}\) scintillation detector and using Monte Carlo simulations. Based on the results of this study, the background contributions from in-beam gamma rays in neutron-reaction measurements at Back-n can be reasonably evaluated, which is beneficial for enhancing both the experimental methodology and data analysis.

Abstract Image

用黑色共振滤波器表征 CSNS Back-n 的波束内伽马射线
中国散裂中子源后流白中子束线(Back-n)是为研究核数据、中子物理和中子应用而搭建的重要中子研究平台。自2018年初以来,Back-n已经进行了多种类型的横截面中子反应测量。这些测量结果表明,大量伽马射线可以随着中子束传输到Back-n的实验站。这些伽马射线通常被称为束内伽马射线,可以在中子反应测量中引起不可忽略的实验背景。研究束内伽马射线的特性对于了解实验背景非常重要。然而,测量束内伽马射线具有挑战性,因为大多数伽马射线探测器都对中子敏感,因此很难区分中子诱导的信号和束内伽马射线的信号。在这项研究中,我们提出使用黑色共振滤波器方法和闪烁探测器来测量Back-n的束内伽马射线特性。这次测量使用了四种黑色共振滤光片,即 181Ta、59Co、natAg 和 natCd。利用飞行时间(TOF)技术选择停留在 TOF 光谱吸收区的探测器信号,这些信号主要是由束内伽马射线引起的。通过分析\(\hbox {CeBr}_{3}\) 闪烁探测器的沉积能谱和蒙特卡罗模拟,确定了Back-n的束内伽马射线的能量分布和通量。根据这项研究的结果,可以合理地评估在Back-n进行中子反应测量时束内伽马射线的背景贡献,这对改进实验方法和数据分析都是有益的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Nuclear Science and Techniques
Nuclear Science and Techniques 物理-核科学技术
CiteScore
5.10
自引率
39.30%
发文量
141
审稿时长
5 months
期刊介绍: Nuclear Science and Techniques (NST) reports scientific findings, technical advances and important results in the fields of nuclear science and techniques. The aim of this periodical is to stimulate cross-fertilization of knowledge among scientists and engineers working in the fields of nuclear research. Scope covers the following subjects: • Synchrotron radiation applications, beamline technology; • Accelerator, ray technology and applications; • Nuclear chemistry, radiochemistry, radiopharmaceuticals, nuclear medicine; • Nuclear electronics and instrumentation; • Nuclear physics and interdisciplinary research; • Nuclear energy science and engineering.
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