Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2013, Vol. 24 ›› Issue (3): 030502 doi: 10.13538/j.1001-8042/nst.2013.03.001

• NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH • Previous Articles     Next Articles

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

TAO Cheng1,2  MA Yugang1  ZHANG Guoqiang1  CAO Xiguang1  FANG Deqing WANG Hongwei1   

  1. 1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China
    2University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-03-27
  • Contact: MA Yugang E-mail: ygma@sinap.ac.cn
  • Supported by:

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

TAO Cheng, MA Yugang, ZHANG Guoqiang, CAO Xiguang, FANG Deqing, WANG Hongwei. Symmetry energy dependence of the pygmy and giant dipole resonances in an isospin dependent quantum molecular dynamics model.Nuclear Science and Techniques, 2013, 24(3): 030502     doi: 10.13538/j.1001-8042/nst.2013.03.001
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Abstract:

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 68Ni, 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.

 

Key words:  Pygmy dipole resonance, Giant dipole resonance, Energy-weighted sum rule, Symmetry energy