Liu, Longxiang; Zhang, Yue; Hao, Zirui; Fan, Gongtao; Wang, Hongwei; Xu, Hanghua; He, Chuangye; Jiao, Pu; Ye, Shan; Yang, Yuxuan; Jin, Sheng; Chen, Kaijie; Li, Zhicai; Sun, Qiankun; Wang, Zhenwei; Xu, Mengke; Wang, Xiangfei; Zhou, Mengdie; Shen, Yulong; Yang, Chang

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT

2025, ,

Liu, Longxiang; Zhang, Yue; Hao, Zirui; Fan, Gongtao; Wang, Hongwei; Xu, Hanghua; He, Chuangye; Jiao, Pu; Ye, Shan; Yang, Yuxuan; Jin, Sheng; Chen, Kaijie; Li, Zhicai; Sun, Qiankun; Wang, Zhenwei; Xu, Mengke; Wang, Xiangfei; Zhou, Mengdie; Shen, Yulong; Yang, Chang

A 3-inch x 4-inch LaBr3 detector was employed to characterize the energy distributions of quasi-monoenergetic gamma-rays generated at the Shanghai Laser Electron Gamma Source (SLEGS), part of the Shanghai Synchrotron Radiation Facility. Systematic calibration of the detector's response was conducted at the China Institute of Atomic Energy using monoenergetic gamma-rays from (p, gamma) nuclear reactions on LiF, Al-27 and C-13 targets. Energy spectrum unfolding was performed through an iterative matrix inversion algorithm, employing the detector's monoenergetic response functions as kernel elements in the linear equation system. This approach facilitated direct reconstruction of gamma-ray energy spectra from raw detector signals. Validation experiments comparing LaBr3 and BGO spectral reconstructions under identical conditions demonstrate strong agreement between both detection systems for gamma-ray spectra with FWHM > 6 %. The methodology successfully characterized gamma-ray beam energy profiles resulting from slant-scattering processes at SLEGS, demonstrating robust performance in complex analysis.