^6Li与核弹性散射的微观光学势  

Microscopic optical potentials in ～6Li scattering by nuclei

作　　者：马引群[1] 马中玉[1] 

机构地区：[1]中国原子能科学研究院

出　　处：《物理学报》2008年第1期74-81,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10475116,10535010,10235030);国家重点基础研究发展计划(973)项目(批准号:2007CB815000)资助的课题~~

摘　　要：从基本的Dirac-Brueckner-Hartree-Fock微观理论出发,得到同时包含实部和虚部的核子-核散射的微观光学势,并利用折叠模型直接获得了核-核散射参数无关的整体微观光学势.考虑到核-核散射去弹过程高级项的贡献和6Li的碎裂效应,在微观光学势的实部和虚部中引入了修正因子NR,NI.系统研究了入射粒子6Li与靶核12C,28Si,40Ca,58Ni,90Zr和208Pb散射的微观光学势,计算中虚部增强因子取NI≈3.0,而实部修正因子NR对于给定的碰撞系统几乎是一个常数.理论很好地再现了所有被研究靶核和入射能量的弹性散射实验数据.参数无关的微观理论对核-核散射,尤其是对不稳定核-核系统反应的描述是有价值的.A parameter-independent microscopic optical potential of nucleus-nucleus interaction is presented by a folding model with the isospin dependent complex nucleon-nuclear potential, which is calculated in the framework of the Dirac-Bruecker-Hartree- Fock approach. Investigations on ^6Li scattering by ^12C, ^28Si, ^40Ca, ^58Ni, ^90Zr, and ^208Pb over a wide range of incident energy and scattering angle with the microscopic nucleus-nucleus optical potential is presented. To take account of the breakup effect of ^6Li and the high order dynamic effect in the reaction a modification factor NR in the real part and an enhancing factor NI in the imaginary part of the microscopic optical potential are introduced. We take the imaginary part enhancing factor N1= 3.0, which has been obtained in the previous study on ^6He scattering by ^12C. The modification factor NR is found to be almost constant with respect to the incident energy and target mass number. The calculations with NR≈0.5-0.6 and N1=3.0 well reproduce the experimental elastic scattering data for all targets and incident energies investigated. Our parameter-independent model should be of value in the description of the nucleus-nucleus scattering of many-body systems, especially unstable nucleus-nucleus systems.

关 键 词：弹性散射 DIRAC Bmeckner HARTREE Fock方法 折叠模型 微观光学势 

分 类 号：O571[理学—粒子物理与原子核物理]