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): 050502 doi: 10.13538/j.1001-8042/nst.2013.05.002

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

Probing the density dependence of the symmetry energy with central heavy ion collisions

XIE Wenjie1,2,3  ZHANG Fengshou1,2,4,*   

  1. 1The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
    2Beijing Radiation Center, Beijing 100875, China
    3Department of Physics, Yuncheng University, Yuncheng 044000, China
    4Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China
  • Received:2013-06-27
  • Contact: ZHANG Fengshou E-mail:fszhang@bnu.edu.cn
  • Supported by:

    Supported by National Natural Science Foundation of China (NSFC) projects (Nos.11025524 and 11161130520) and National Basic Research Program of China (No. 2010CB832903).

XIE Wenjie, ZHANG Fengshou. Probing the density dependence of the symmetry energy with central heavy ion collisions.Nuclear Science and Techniques, 2013, 24(5): 050502     doi: 10.13538/j.1001-8042/nst.2013.05.002

Abstract:

An improved isospin dependent Boltzmann Langevin model, in which the inelastic channels and momentum dependent interactions are incorporated, is used to investigate the high-density behavior of nuclear symmetry energy. By taking several forms of nuclear symmetry energy, we calculate the time evolutions of neutron over proton ratio, π multiplicity and π/ π+ ratio, and the kinetic energy and transverse momentum spectra of π/ π+ ratio in the heavy ion collisions at 400A MeV. It is found that the neutron over proton ratio and π/ π+ ratio are very sensitive to the nuclear symmetry energy, and the π is more sensitive to the nuclear symmetry energy than the π+. A supersoft symmetry energy results in a larger π/ π+  ratio.

Key words: Improved isospin dependent Boltzmann-Langevin model, Nuclear symmetry energy, Neutron over proton ratio, Pion production