200MeV以下质子-核散射的相对论微观描述  

Relativistic microscopic description of proton-nucleus scattering at energies up to 200MeV

作　　者：荣健[1] 马中玉[1,2,3] 

机构地区：[1]中国原子能科学研究院 [2]兰州重离子加速器国家实验室原子核理论中心,兰州733000 [3]中国科学院理论物理研究所,北京100080

出　　处：《物理学报》2005年第4期1528-1537,共10页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :10 2 75 0 0 94;10 0 75 0 80 ;10 2 3 5 0 2 0 );国家重点基础研究发展规划 (批准号 :G19990 2 2 60 3 ;G2 0 0 0 0 7740 0 )资助的课题~~

摘　　要：应用DiracBr櫣ｃｋｎｅｒ Hartree Fock方法 ,采用新的G矩阵分解方式研究了核子在核介质中的同位旋相关的相对论微观光学势 ,采用定域密度近似得到有限核的相对论微观光学势 .讨论了有限核的相对论微观光学势及其Schr dinger等价势与入射质子能量的关系 ,计算了 2 0 0MeV以下质子入射4 0 Ca和2 0 8Pb核的弹性散射角分布和分析本领 ,得到了与实验相一致的结果 ,并将这种方法推广用于不稳定核的研究 .通过对Ca同位素的计算可以看出 ,在相对论微观光学势中考虑同位旋效应对奇特核的研究是非常重要的 .A new decomposition of the Dirac Bruckner- Hartree- Fock (DBHF) G matrix is used to study the isospin- dependent relativistic microscopic optical potential (RMOP). The optical potential of finite nuclei can be obtained in the local density approximation. The energy dependence of proton-nucleus scattering for the optical potentials of finite nuclei is discussed. The differential cross sections and the resolution power in the p + Ca-40 and p + Ph-208 at E-p less than 200 MeV are also calculated using the above RMOP. It is found that the calculated results agree with the experimental results. It should be emphasized that the ROMP obtained from DBHF G matrix without any free parameters could well describe the proton elastic scattering. This RMOP can also be used for unstable nuclei. From the results of the Ca isotopes, it is found that the isospin dependence is more important for the exotic nuclei.

关 键 词：质子-核散射 相对论微观光学势 定域密度近似 不对称核物质 同位旋 

分 类 号：O571[理学—粒子物理与原子核物理]