核天体反应直接测量中的γ加和谱解析方法

The radiative capture reaction of charged particles is one of the main research contents in nuclear astrophysics and is of great significance for understanding the process of stellar nucleosynthesis. Due to the extremely small cross-sections of these reactions at stellar temperatures (Gamow window) and the very low gamma-ray yields, experiments need to be carried out in combination with highly efficient gamma-summing detection techniques for measurement. Based on Bayesian theory and related analysis programs, this paper has developed an analytical method for the energy spectra of summing gamma-ray detection arrays and used this method to analyze the experimental data measured by the Jinping Underground Nuclear Astrophysics Experiment project. The effectiveness of this analytical method has been verified, and the error of the gamma-summing peak detection efficiency has been significantly reduced, further improving the measurement accuracy of the gamma-summing detection technique.

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.