^(70,73)Ge的麦克斯韦平均截面计算  

Maxwell Average Cross Section Calculation of ^(70,73)Ge

作　　者：李雪[1,2] 黄美容 王德鑫 LI Xue;HUANG Mei-rong;WANG De-xin(College of Mathematics and Physics,Inner Mongolia Minzu University,Tongliao 028043,China;Institute of Nuclear Physics,Inner Mongolia Minzu University,Tongliao 028043,China)

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

出　　处：《内蒙古民族大学学报（自然科学版）》2021年第4期281-289,共9页Journal of Inner Mongolia Minzu University：Natural Sciences

基　　金：国家自然科学基金项目(11865010);内蒙古自治区自然科学基金项目(2018MS01009);内蒙古民族大学自然科学一般项目(nmdyb20044)。

摘　　要：中子俘获(n,γ)反应能够解释宇宙中比铁重的核素合成.恒星麦克斯韦平均截面是核反应截面与恒星温度的卷积,其准确性影响整个恒星结构与演化.本工作中,利用梯形积分、复化梯形积分与复化辛普森积分等方法,基于ENDF/B-VII.1、JEFF-3.1.2、JENDL-4.0、CENDL-3.1评价库的(n,γ)截面数据,计算研究了不同数值积分方法对恒星麦克斯韦平均截面精度影响.结果表明,梯形数值积分方法能够更好地再现文献数据.利用已验证的梯形数值积分程序计算了最新评价库ENDF/B-VIII.0、CENDL-3.2、JEFF-3.3、TENDL-2019中的^(70,73)Ge麦克斯韦平均截面.该结果为恒星^(70,73)Ge及其相关核素反应网络计算提供关键核数据,对天体恒星核合成研究具有重要的应用价值.The neutron capture(n,γ)reaction can explain the synthesis of nuclides heavier than iron in the universe.The average cross section of a star Maxwell is the convolution of the nuclear reaction cross section and the temperature of the star,and its accuracy affects the entire stellar structure and evolution.In this work,methods such as trapezoidal integral,complex trapezoidal integral and complex Simpson integral were used to calculate and study the influence of different numerical integration methods on the accuracy of the star Maxwell's average cross-section,based on the(n,γ)cross-section data of the ENDF/B-VII.1,JEFF-3.1.2,JENDL-4.0,CENDL 3.1 evaluation libraries.The results show that the trapezoidal numerical integration method can reproduce the literature data better.The ^(70,73)Ge Maxwell average cross-section in the latest evaluation libraries ENDF/B-VIII.0,CENDL-3.2,JEFF-3.3,and TENDL-2019 were calculated by using the validated trapezoidal numerical integration program.This result provides the key nuclear data for the calculation of the stellar ^(70,73)Ge and its related nuclide reaction network,and has important application value for the research of celestial stellar nucleosynthesis.

关 键 词：中子俘获反应 麦克斯韦平均截面 数值积分 评价核数据库 70 73Ge 

分 类 号：O571[理学—粒子物理与原子核物理]