208Pb的Lane自洽色散光学势  

Research on Lane-consistent dispersive optical-model potential for 208Pb

作　　者：杜文青 赵岫鸟 DU Wenqing;ZHAO Xiuniao(College of Physical Science and Technology,Bohai University,Jinzhou 121013,China)

机构地区：[1]渤海大学物理科学与技术学院,锦州121013

出　　处：《物理学报》2025年第5期20-24,共5页Acta Physica Sinica

摘　　要：采用色散光学模型成功构建了球形核208Pb的Lane自洽色散光学势,采用同一套势参数同时对208Pb的两种核子(中子和质子)弹性散射数据进行了良好的描述,高质量地计算了包括中子总截面、核子弹性散射角分布、分析本领以及(p,n)准弹性散射角分布在内的相关核子散射数据,理论计算结果与实验数据具有很好的一致性.Lead is an important alloy material and nuclear fuel component.Lead-based eutectic alloys serve as important coolants and have been extensively utilized in the construction of lead-cooled fast reactor,such as the European lead-cooled System(ELSY)and the China lead-based Research reactor(CLEAR-I).These materials also play a significant role in research related to Generation-IV reactors.The study and calculation of lead nuclear data have important theoretical value and application prospects.208Pb is the most stable and abundant isotope in lead nuclei,and high-quality description of 208Pb nuclear scattering data is important in achieving accurate theoretical calculations of nuclear reaction cross-sections in lead-based nuclear systems Based on the dispersive optical model,the nucleon scattering on 208Pb is described through the implementation of a dispersive optical potential in this work.The dispersive optical model potential is defined as energy-dependent real potential and imaginary potential.The dispersive contribution corresponding to the real potential is calculated analytically from the corresponding imaginary potential by using a dispersion relation,and the isospin dependence is reasonably considered by introducing an isovector component(i.e.Lane term)into the real part and the imaginary part of potential:the depth constant of the real Hartree-Fock V_(HF)potential and the depth constant of surface imaginary potential W_(s).Unlike K-D potential,which requires two different sets of parameters to describe neutron and proton induced scattering data.This optical potential uses the same set of parameters to simultaneously describe nucleon-nucleus scattering data.The derived potential in this work shows a very good description of nucleon-nucleus scattering data on 208Pb with energies up to 200 MeV.The calculated neutron total cross sections,neutron and proton elastic scattering angular distributions,and neutron and proton elastic analyzing powers are shown to be in good agreement with experimental data.Additionally

关 键 词：光学模型 色散光学势 核子弹性散射 

分 类 号：O57[理学—粒子物理与原子核物理]