Isospin effect in peripheral heavy-ion collisions at Fermi energies

  • The isospin effect in peripheral heavy-ion collisions was thoroughly investigated within the framework of the Lanzhou quantum molecular dynamics (LQMD) transport model. A coalescence approach was used to recognize the primary fragments formed in nucleus-nucleus collisions. The secondary decay process of these fragments was described using the statistical code GEMINI. The production mechanism and isospin effect of the projectile-like and target-like fragments were analyzed using the combined approach. It was found that the isospin migration from the high-isospin density to the low-density matter occurred in the neutron-rich nuclear reactions, i.e., 48Ca+208Pb, 86Kr+48Ca/208Pb/124Sn, 136Xe+208Pb, 124Sn+124Sn, and 136Xe+136Xe. A hard symmetry energy was available for creating the neutron-rich fragments, particularly in the medium-mass region. The isospin effect of the neutron-to-proton (n/p) ratio of the complex fragments was reduced when the secondary decay process was included. However, a soft symmetry energy enhanced the n/p ratio of the light particles, particularly at kinetic energies greater than 15 MeV/nucleon.
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Ya-Fei Guo, Peng-Hui Chen, Fei Niu and Zhao-Qing Feng. Isospin effect in peripheral heavy-ion collisions at Fermi energies[J]. Chinese Physics C, 2018, 42(12): 124106. doi: 10.1088/1674-1137/42/12/124106
Ya-Fei Guo, Peng-Hui Chen, Fei Niu and Zhao-Qing Feng. Isospin effect in peripheral heavy-ion collisions at Fermi energies[J]. Chinese Physics C, 2018, 42(12): 124106.  doi: 10.1088/1674-1137/42/12/124106 shu
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Received: 2018-07-22
Revised: 2018-09-20
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    Supported by the National Natural Science Foundation of China (11722546, 11675226) and the Talent Program of South China University of Technology (K5180470)

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Isospin effect in peripheral heavy-ion collisions at Fermi energies

    Corresponding author: Zhao-Qing Feng,
  • 1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 2. University of Chinese Academy of Sciences, Beijing 100190, China
  • 3.  School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
Fund Project:  Supported by the National Natural Science Foundation of China (11722546, 11675226) and the Talent Program of South China University of Technology (K5180470)

Abstract: The isospin effect in peripheral heavy-ion collisions was thoroughly investigated within the framework of the Lanzhou quantum molecular dynamics (LQMD) transport model. A coalescence approach was used to recognize the primary fragments formed in nucleus-nucleus collisions. The secondary decay process of these fragments was described using the statistical code GEMINI. The production mechanism and isospin effect of the projectile-like and target-like fragments were analyzed using the combined approach. It was found that the isospin migration from the high-isospin density to the low-density matter occurred in the neutron-rich nuclear reactions, i.e., 48Ca+208Pb, 86Kr+48Ca/208Pb/124Sn, 136Xe+208Pb, 124Sn+124Sn, and 136Xe+136Xe. A hard symmetry energy was available for creating the neutron-rich fragments, particularly in the medium-mass region. The isospin effect of the neutron-to-proton (n/p) ratio of the complex fragments was reduced when the secondary decay process was included. However, a soft symmetry energy enhanced the n/p ratio of the light particles, particularly at kinetic energies greater than 15 MeV/nucleon.

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