Symmetry energy dependence of the pygmy and giant dipole resonances in an isospin dependent quantum molecular dynamics model

作     者：TAO Cheng MA Yugang ZHANG Guoqiang CAO Xiguang FANG Deqing WANG Hongwei 

作者机构：Shanghai Institute of Applied PhysicsChinese Academy of SciencesJiading Campus University of Chinese Academy of Sciences 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2013年第24卷第3期

页      面：55-60页

核心收录：

学科分类：1001[医学-基础医学(可授医学、理学学位)] 07[理学] 070201[理学-理论物理] 0702[理学-物理学] 10[医学] 

基　　金：Supported by the National Natural Science Foundation of China(Nos.11220101005,11035009,10979074 and 11205230) Major State Basic Research Development Program in China(No.2013CB834405) 

主　　题：量子分子动力学模型 巨偶极共振 同位旋相关 对称能 能源 侏儒 IQMD 峰值能量 

摘      要：Isospin-dependent Quantum Molecular Dynamics model (IQMD) has been applied to investigate the Pygmy Dipole Resonance (PDR) and Giant Dipole Resonance (GDR) in Ni isotopes by Coulomb excitation. By Gaussian fitting to the photon emission spectra, the peak energies and strengths of PDR and GDR are extracted. Their sensitivities to impact parameter, incident energy and the symmetry energy are discussed. By the comparison of energy-weighted sum rule (EWSR) with the data and other calculations for 68 Ni, the parameters of density-dependence of symmetry energy in the IQMD are constrained. In addition, the N/Z dependence of PDR and GDR parameters of Ni isotopes are investigated, and the results that the EWSR increases linearly with the N/Z are obtained.