Contributions of Currents and Coulomb Interaction to Multipole Giant Resonances in Relativistic Continuum Random Phase Approximation  

作　　者：YANG Ding CAO Li-gang MA Zhong-yu 

机构地区：[1]不详 [2]Institute of Modern Physics, Lamzhou 730000, China

出　　处：《Annual Report of China Institute of Atomic Energy》2009年第1期156-157,共2页中国原子能科学研究院年报（英文版）

基　　金：Supported by National Natural Science Foundation of China (10875150,10775183,10535010);Major State Basic Research Development Programme of China (2007CB815000);European Community Project Asia-Europe Link in Nuclear Physics and Astrophysics (CN/ASIA-LINK/008(94791))

摘　　要：The contributions of the currents and the Coulomb interaction to multipole excitations are studied in the framework of a fully consistent relativistic continuum random phase approximation (RCRPA).The contributions of the currents and the Coulomb interaction to multipole excitations are studied in the framework of a fully consistent relativistic continuum random phase approximation （RCRPA）. In this method the contribution of the continuum spectrum to nuclear excitations is treated exactly by the single particle Green＇s function technique. The negative energy states in the Dirac sea are also included in the single particle Green＇s function in the no-sea approximation. The single particle Green＇s function is calculated numerically by a proper product of the regular and irregular solutions of the Dirac equation. The calculations are fully consistent： the effective Lagrangian with NL3 is used both to describe the properties of the bound state and the particle-hole （ph） residual interactions in nuclear collective excitations. In addition the currents due to the vector meson exchanges vanish in the ground state and give sizable contributions in the RCRPA calculations. The Coulomb interaction in the ph residual interactions is considered and the spin-orbit interaction is included naturally in the relativistic frame.

关 键 词：相对论无规位相近似 库仑相互作用 电流 多极 巨共振 格林函数方法 自旋轨道相互作用 狄拉克方程 

分 类 号：O571.251[理学—粒子物理与原子核物理] O53[理学—物理]