核天体反应直接测量中的γ加和谱解析方法  

γ spectrum analysis in direct measurements of nuclear astrophysical reaction

作　　者：王泺欢 盛耀德 苏俊 何建军 张立勇 李子铭 张昊 谌阳平 李志宏[2] 郭冰[2] 连刚[2] 柳卫平[2] WANG Luohuan;SHENG Yaode;SU Jun;HE Jianjun;ZHANG Liyong;LI Ziming;ZHANG Hao;SHEN Yangping;LI Zhihong;GUO Bing;LIAN Gang;LIU Weiping(Key Laboratory of Beam Technology of Ministry of Education,College of Nuclear Science and Technology,Beijing Normal University,100875.Beijing,China;China Institute of Atomic Energy,102413,Beijing,China)

机构地区：[1]射线束技术教育部重点实验室,北京师范大学核科学与技术学院,北京100875 [2]中国原子能科学研究院,北京102413

出　　处：《北京师范大学学报（自然科学版）》2022年第5期748-754,共7页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(U1867211,11490563,11490560)。

摘　　要：带电粒子辐射俘获反应是核天体物理的主要研究内容之一,对了解恒星核合成过程具有重要意义.由于恒星温度(伽莫夫窗口)下这些反应的截面极小,γ射线产额非常低,实验需要结合高效率的γ加和探测技术进行测量.本文基于贝叶斯理论和相关分析程序,发展了一种对加和型γ探测阵列能谱的解析方法,并利用该方法对锦屏深地核天体物理实验项目测量的实验数据进行分析,验证了该解析方法的有效性,并显著减小了γ加和峰探测效率的误差,进一步提高了γ加和探测技术的测量精度.Charged particle-induced radioactive capture reaction is a major topic in nuclear astrophysics,significant to understand stellar nucleosynthesis. At astrophysical temperature(Gamow window),the cross area of these reactions is small,γ ray yields are extremely low,therefore high-efficiency summing γ detection array is needed in cross section measurements. Bayesian analysis was used here to develop an analytical method for γ spectrum of 4π detection array. The method was applied to analyze data of 259 keV resonance ofN(p,γ)O and 304 keV resonance ofMg(p,γ)Al measured at Jinping Underground Nuclear Astrophysics experimental facility. The new method was found to reduce significantly uncertainty in γ summing peak efficiency.

关 键 词：带电粒子辐射俘获反应 深地核天体反应直接测量 γ加和探测技术 贝叶斯分析方法 首次γ跃迁分支比 γ加和峰探测效率 

分 类 号：O571.422[理学—粒子物理与原子核物理]