天体核反应网络方程计算程序PP-chain  

Astronomical Nuclear Reaction Network Equation Calculation Program PP-chain

作　　者：利国 张苏雅拉吐 黄美容 王德鑫 李雪[1,2] 牛丹丹 蒙古夫 LI Guo;ZHANG Suyalatu;HUANG Mei-rong;WANG De-xin;LI Xue;NIU Dan-dan;Menggufu(Institute of Nuclear Physics,Inner Mongolia Minzu University,Tongliao 028043,China;College of Mathematics and Physics,Inner Mongolia Minzu University,Tongliao 028043,China)

机构地区：[1]内蒙古民族大学核物理研究所,内蒙古通辽028043 [2]内蒙古民族大学数理学院,内蒙古通辽028043

出　　处：《内蒙古民族大学学报（自然科学版）》2022年第3期200-204,共5页Journal of Inner Mongolia Minzu University：Natural Sciences

基　　金：国家自然科学基金项目(11865010,U2032146);内蒙古自治区自然科学基金项目(2018MS01009)。

摘　　要：核天体物理学旨在应用核物理知识来阐释宇宙天体演化进程。恒星结构与演化以及元素核合成是核天体物理学的前沿热点研究课题。核反应网络方程的建立和求解,可模拟天体演化过程中的元素核合成,包括核素丰度变化、能量的释放、反应路径等。根据主序星演化过程,建立了其内部进行的氢燃烧第一阶段质子-质子链式反应(PP-chain)的核反应网络方程。利用二阶Rosenbrock公式设计程序求解了核反应网络方程,并得到了核反应网络中核素的丰度时间演化。计算结果能够再现标准程序MESA计算结果。Nuclear astrophysics aims to explain the evolution of cosmic body by applying nuclear physics knowledge.Stellar structure and evolution as well as elemental nucleosynthesis are hot research topics in nuclear astrophysics.The establishment and solution of the nuclear reaction network equation can simulate the nucleosynthesis of elements including the nuclide abundance change,energy release and reaction path in the process of the astronomical evolution.In this paper,a nuclear reaction network equation for the proton-proton chain reaction(PPchain)in the first stage of hydrogen burning is established according to the evolution process of the main sequence star.The second-order Rosenbrock formula is used to solve the equation of nuclear reaction network,and the time evolution of nuclide abundance in nuclear reaction network is obtained.The results can reproduce those that calculated by the standard program MESA.

关 键 词：天体演化 氢燃烧 化学元素 核反应网络方程 

分 类 号：P142[天文地球—天体物理]