The energy response of LaBr_(3)(Ce),LaBr_(3)(Ce,Sr),and NaI(Tl)crystals for GECAM  

作　　者：Pei-Yi Feng Xi-Lei Sun Zheng-Hua An Yong Deng Cheng-Er Wang Huang Jiang Jun-Jie Li Da-Li Zhang Xin-Qiao Li Shao-Lin Xiong Chao Zheng Ke Gong Sheng Yang Xiao-Jing Liu Min Gao Xiang-Yang Wen Ya-Qing liu Yan-Bing Xu Xiao-Yun Zhao Jia-Cong Liu Fan Zhang Hong Lu 

机构地区：[1]Particle and Astrophysics Center,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]University of Chinese Academy of Sciences,Chinese Academy of Sciences,Beijing 100049,China [4]Experimental Physics Center,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [5]State Key Laboratory of Particle Detection and Electronics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [6]School of Nuclear Science and Technology,University of South China,Hengyang 421001,China [7]National Engineering Research Center for Rare Earth,Grirem Advanced Materials Co.,Ltd.and General Research Institute for Nonferrous Metals,Beijing 100088,China

出　　处：《Nuclear Science and Techniques》2024年第2期110-122,共13页核技术（英文）

基　　金：This work was supported by the National Key Research and Development Program(Nos.2022YFB3503600 and 2021YFA0718500);Strategic Priority Research Program of the Chinese Academy of Sciences(Nos.XDA15360102);National Natural Science Foundation of China(Nos.12273042 and 12075258).

摘　　要：The GECAM series of satellites utilizes LaBr_(3)(Ce),LaBr_(3)(Ce,Sr),and NaI(Tl)crystals as sensitive materials for gamma-ray detectors(GRDs).To investigate the nonlinearity in the detection of low-energy gamma rays and address the errors in the calibration of the E-C relationship,comprehensive tests and comparative studies of the three aforementioned crystals were conducted using Compton electrons,radioactive sources,and mono-energetic X-rays.The nonlinearity test results of the Compton electrons and X-rays demonstrated substantial differences,with all three crystals presenting a higher nonlinearity for X/-rays than for Compton electrons.Despite the LaBr_(3)(Ce)and LaBr_(3)(Ce,Sr)crystals having higher absolute light yields,they exhibited a noticeable nonlinear decrease in the light yield,especially at energies below 400 keV.The NaI(Tl)crystal demonstrated an"excess"light output in the 6-200 keV range,reaching a maximum"excess"of 9.2%at 30 keV in the X-ray testing and up to 15.5%at 14 keV during Compton electron testing,indicating a significant advantage in the detection of low-energy gamma rays.Furthermore,we explored the underlying causes of the observed nonlinearity in these crystals.This study not only elucidates the detector responses of GECAM,but also initiates a comprehensive investigation of the nonlinearity of domestically produced lanthanum bromide and sodium iodide crystals.

关 键 词：LaBr_(3)(Ce)detector LaBr_(3)(Ce Sr)detector NaI(Tl)detector GECAM Energy response Light yield nonlinearity 

分 类 号：P14[天文地球—天体物理]