基于TALYS程序的175Lu中子俘获截面理论研究  

Theoretical Study of the Neutron Capture Cross-section of ^(175)Lu Based on the TALYS Program

作　　者：杨雪 黄美容 张苏雅拉吐 王德鑫[1,2] 利国 YANG Xue;HUANG Meirong;ZHANG Suyalatu;WANG Dexin;LI Guo;(Institute of Nuclear Physics;College of Physics and Electronic Information;Inner Mongolia(Minzu University,Tongliao 028000,Inner Mongolia,China;Inner Mongolia Joint Key Laboratory for Nuclear and Radiation Detection,Tongliao 028000,Inner Mongolia,China)

机构地区：[1]内蒙古民族大学物理与电子信息学院和核物理研究所,内蒙古通辽028000 [2]内蒙古自治区核与辐射探测联合实验室,内蒙古通辽028000

出　　处：《原子核物理评论》2024年第4期1092-1098,共7页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(12365018,U2032146);内蒙古自然科学基金项目(2023MS01005);内蒙古自治区高等学校创新团队发展支持计划项目(NMGIRT2217);内蒙古自治区高等学校青年科技英才支持计划项目(NJYT23109);内蒙古自治区直属高校基本科研业务费(GXKY22061)。

摘　　要：^(175)Lu中子俘获反应在核反应堆和重元素核合成过程中有着非常重要的作用。^(176)Lu存在一个122.8 keV同质异能态(^(176m)Lu),使^(175)Lu(n,γ)^(176)Lu反应截面的测量难度增加。为了研究该反应截面及其在s-过程核合成中的影响,采用TALYS-2.0程序计算了0.01~20 MeV能量范围内的^(175)Lu中子俘获截面和生成^(176)Lu基态、同质异能态的分截面,并与EXFOR实验数据库以及ENDF评价数据库的数据进行比较。结果表明,核能级密度模型与光子强度函数模型同时组合优化时,计算结果与实验值符合较好。此外,还计算了0.01~100 keV能量范围内的麦克斯韦平均截面,并与KADoNiS v0.3数据库中的实验值进行比较,在kT=30 keV时,计算值与实验值符合较好,相对偏差为4.1%。研究表明,TALYS程序可以较好地描述^(175)Lu(n,γ)^(176)Lu反应截面,为进一步优化参数和验证实验数据提供了参考,对于研究s-过程核合成具有重要意义。The neutron capture reaction of ^(175)Lu is of great importance in nuclear reactors and heavy ion nucleosynthesis processes in the universe.The existence of a 122.8 keV isomeric state(^(176m)Lu)in ^(176)Lu increases the difficulty in measuring the cross sections of ^(175)Lu(n,γ)^(176)Lu reaction.To study this reaction cross-section and its impact on s-process nucleosynthesis,the TALYS-2.0 program was used to calculate the total cross-section of the ^(175)Lu neutron capture reaction and the partial cross-sections for the production of the ^(176)Lu ground state and isomeric state in the energy range of 0.01~20 MeV.The results were compared with data from the EXFOR experimental database and the ENDF evaluated nuclear data library.The results show that when the nuclear level density model and the photon strength function model are optimized in combination,the calculated results are in good agreement with the experimental values.Additionally,the Maxwellian-averaged cross-sections were calculated in the energy range of 0.01~100 keV and compared with the experimental values from the KADoNiS v0.3 database.At kT=30 keV,the calculated value agrees well with the experimental value,with a relative deviation of 4.1%.This study demonstrates that the TALYS program can effectively describe the ^(175)Lu(n,γ)^(176)Lu reaction cross-section,providing a reference for further parameter optimization and validation of experimental data,which is of great significance for investigating s-process nucleosynthesis.

关 键 词：^(175)Lu(n γ)^(176)Lu反应 反应截面 麦克斯韦平均截面 TALYS-2.0 

分 类 号：O571.421[理学—粒子物理与原子核物理]