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

作　　者：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 

机构地区：[1]Key Laboratory of Nuclear Data,China Institute of Atomic Energy,Beijing 102413,China [2]Institute of High Energy Physics,Chinese Academy of Sciences(CAS),Beijing 100049,China [3]Spallation Neutron Source Science Center,Dongguan 523803,China [4]State Key Laboratory of Nuclear Physics and Technology,School of Physics,Peking University,Beijing 100871,China [5]Institute of Modern Physics,Fudan University,Shanghai 200433,China [6]State Key Laboratory of Particle Detection and Electronics,University of Science and Technology of China,Hefei 230026,China [7]School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,China [8]Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China [9]Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China [10]USTC Archaeometry Lab,University of Science and Technology of China,Hefei 230026,China [11]State Key Laboratory of Particle Detection and Electronics,Institute of High Energy Physics Chinese Academy of Sciences,Beijing 100049,China [12]Northwest Institute of Nuclear Technology,Xi’an 710024,China [13]University of Chinese Academy of Sciences,Beijing 100049,China [14]School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China [15]Institute of Advanced Technology,University of Science and Technology of China,Hefei 230027,China

出　　处：《Nuclear Science and Techniques》2024年第10期149-160,共12页核技术（英文）

基　　金：supported by the Youth Talent Program of China National Nuclear Corporation;the Continuous-Support Basic Scientific Research Project(BJ010261223282);the National Natural Science Foundation of China(No.11790321);the Research and development project of China National Nuclear Corporation。

摘　　要：The back-streaming white-neutron beamline(Back-n)of the China Spallation Neutron Source is an essential neutronresearch 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 CeBr_(3) scintillation detector to measure the characteristics of the in-beam gamma rays of Back-n.Four types of black resonance filters,^(181)Ta,^(59)Co,^(nat)Ag,and^(nat)Cd,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 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.

关 键 词：In-beam gamma rays Back-n CeBr_(3)scintillator Black filter resonance technique 

分 类 号：O571.5[理学—粒子物理与原子核物理]