Isospin-dependent relativistic microscopic optical potential in the Dirac Brueckner-Hartree-Fock method  

作　　者：RONG Jian1 & MA Zhongyu1,2,3 1. China Institute of Atomic Energy, Beijing 102413, China 2. Center of Nuclear Theoretical Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lan-zhou 730000, China 3. Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China Correspondence should be addressed to Rong Jian (email: [e-mail]) 

出　　处：《Science China(Physics,Mechanics & Astronomy)》2004年第2期189-198,共10页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.10275094,10075080 and 10235020);the Major State Basic Research Development Programme of China(Contract No.G1999022603 and G2000077400).

摘　　要：The relativistic microscopic optical potential in the asymmetric nuclear matter is studied in the framework of the Dirac Brueckner-Hartree-Fock method. A new decomposition of the Dirac structure of the nuclear self-energy in nuclear matter is adopted. The self-energy of a nucleon with E > 0 in nuclear matter is calculated with the G matrix in the Hartree-Fock approach. The optical potential of a nucleon in the nuclear medium is identified with the nucleon self-energy. The energy and asymmetric parameter dependence of the relativistic optical potentials for proton and neutron are discussed. The resulting Schroedinger equivalent potentials have reasonable behaviors of the energy dependence. The asymmetric parameter dependence of relativistic optical potentials and Schroedinger potentials are emphasized.The relativistic microscopic optical potential in the asymmetric nuclear matter is studied in the framework of the Dirac Brueckner-Hartree-Fock method. A new decomposition of the Dirac structure of the nuclear self-energy in nuclear matter is adopted. The self-energy of a nucleon withE>0 in nuclear matter is calculated with the G matrix in the Hartree-Fock approach. The optical potential of a nucleon in the nuclear medium is identified with the nucleon self-energy. The energy and asymmetric parameter dependence of the relativistic optical potentials for proton and neutron are discussed. The resulting Schroedinger equivalent potentials have reasonable behaviors of the energy dependence. The asymmetric parameter dependence of relativistic optical potentials and Schroedinger potentials are emphasized.

关 键 词：DIRAC Brueckner Hartree-Fock  RELATIVISTIC MICROSCOPIC optical potential  ASYMMETRIC nuclear matter  isospin-dependence. 

分 类 号：O571[理学—粒子物理与原子核物理]