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 (5): 050503 doi: 10.13538/j.1001-8042/nst.2013.05.003

Special Issue: Special Section on International Workshop on Nuclear Dynamics in Heavy-Ion Reaction (IWND2012)

• Special Section on International Workshop on Nuclear Dynamics in Heavy-Ion Reaction (IWND2012) • Previous Articles     Next Articles

Constraints on symmetry energy and n/p effective mass splitting with improved quantum molecular dynamics model

ZHANG Yingxun1,2,*  LI Zhuxia1  ZHAO Kai1  LIU Hang3  TSANG M B2   

  1. 1China Institute of Atomic Energy, Beijing102413, China
    2National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
    3Texas Advanced Computing Center, University of Texas, Austin, Texas 78758, USA  
  • Received:2013-06-27
  • Contact: ZHANG Yingxun E-mail: zhyx@ciae.ac.cn
  • Supported by:

    Supported by National Natural Science Foundation of China (NSFC) projects (Nos.11075215, 10875031, 11005022, 11005155 and 11275052), 973 Program of China (No. 2013CB834404) and National Science Foundation (Grants No. PHY-0606007).

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ZHANG Yingxun, LI Zhuxia, ZHAO Kai, LIU Hang, TSANG M B. Constraints on symmetry energy and n/p effective mass splitting with improved quantum molecular dynamics model.Nuclear Science and Techniques, 2013, 24(5): 050503     doi: 10.13538/j.1001-8042/nst.2013.05.003

Abstract:

A new version of improved quantum molecular dynamics model that includes standard Skyrme interactions has been developed. Based on the new code, four commonly used parameter sets, SLy4, SkI2, SkM* and Gs are adopted in the improved quantum molecular dynamics model and the isospin sensitive observables, namely isospin transport ratios, single and double ratios of the yields of neutrons and protons are investigated. The isospin transport ratios are strongly sensitive to the slope of symmetry energy, and are not very sensitive to the nucleon effective mass splitting. On the other hand, the high energy neutrons and protons yields ratios from reactions at different incident energies provide a good observable to the momentum dependence of nucleon effective mass splitting. By comparing our calculations with the data, we find that the constrained L value (the slope of density dependence of symmetry energy) is about ~46 MeV when the Skyrme type interaction is considered in transport models, and the isospin diffusion data prefer to mn*>mp* , but it is not a strong constraint with deep χ2 minimum.

Key words: Symmetry energy, Nucleon effective mass splitting, Heavy ion collisions, ImQMD