摘要
核共振荧光(NRF)实验可对光核反应低激发能级进行研究。上海激光电子伽马源(SLEGS)设计、建造了一组由2台大尺寸同轴高纯锗(HPGe,ϕ80 mm×70 mm)探测器和2台CLOVER HPGe(4×ϕ50 mm×70 mm)探测器组成的核共振荧光谱仪,大尺寸HPGe探测器获得了大于100%的相对效率和好于0.3%@1332 keV的能量分辨率。谱仪采用Mesytec MDPP-16数字脉冲处理器及MVME获取系统,以读取和记录HPGe前置放大器输出信号的幅度和时间信息。研究了CLOVER HPGe探测器在加和(Add-back)模式和去除(Reduction)模式下的性能提升,结果表明,Add-back重建可以显著提高全能峰效率和峰总比,在1460 keV能量处,Add-back重建后的全能峰效率可以提高21%以上。由于Add-back重建引入了多个晶体之间的耦合,导致探测器能量分辨稍有下降。而Reduction模式可以降低康普顿峰,提高峰总比,并保持和直接(Direct)工作模式同等水平的能量分辨,但是损失了一定的全能峰效率。
Nuclear resonance fluorescence(NRF)experiments can be used to study the low excitation energy levels of photonuclear reactions.Shanghai Laser Electron Gamma Source(SLEGS)designed and constructed a NRF spectrometer consisting of two large-scale coaxial high-purity germanium(HPGe,ϕ80 mm×70 mm)detectors and two CLOVER HPGe(4×ϕ50 mm×70 mm),the large-scale HPGe detectors obtained relative efficiency greater than 100%and energy resolution better than 0.3%@1332 keV.The spectrometer adopts Mesytec MDPP-16 digital pulse processor and MVME acquisition system,which can read and record the amplitude and time information of the HPGe preamplifier output signal.The Add-back mode and Reduction mode of the CLOVER HPGe detector are studied.Results show that Add-back reconstruction can significantly improve the full-energy peak efficiency and peak-to-total ratio,the full-energy peak efficiency after Add-back reconstruction can be improved by more than 21%at 1460 keV energy.The detector energy resolution is slightly degraded due to the coupling between multiple crystals introduced by the Add-back reconstruction.Whereas at reduction mode,it can reduce the compton peak,improve the peak-to-total ratio,and maintain the energy resolution as good as the Direct mode,however,a certain amount of full energy peak efficiency is lost.
作者
匡攀
宋龙龙
陈开杰
王宏伟
刘龙祥
范功涛
许杭华
胡新荣
李鑫祥
郝子锐
杨宇萱
金晟
Pan KUANG;Longlong SONG;Kaijie CHEN;Hongwei WANG;Longxiang LIU;Gongtao FAN;Hanghua XU;Xinrong HU;Xinxiang LI;Zirui HAO;Yuxuan YANG;Sheng JIN(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China;ShanghaiTech University,Shanghai 200120,China;Zhengzhou University,Zhengzhou 450001,China)
出处
《原子核物理评论》
CAS
CSCD
北大核心
2023年第1期58-65,共8页
Nuclear Physics Review
基金
国家自然科学基金面上资助项目(11875311,11905274,12005280)。
