Isospin effect in peripheral heavy-ion collisions at Fermi energies

Ya-Fei Guo; Peng-Hui Chen; Fei Niu; Zhao-Qing Feng

doi:10.1088/1674-1137/42/12/124106

Chinese Physics C> 2018, Vol. 42> Issue(12) : 124106 DOI: 10.1088/1674-1137/42/12/124106

Isospin effect in peripheral heavy-ion collisions at Fermi energies

Ya-Fei Guo ^1,2 ,
Peng-Hui Chen ^1,2 ,
Fei Niu ³ ,
Zhao-Qing Feng ^1,2,,

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

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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.
- symmetry energy ,
- nuclear fragmentation reaction ,
- neutron-rich nuclei ,
- LQMD transport model

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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

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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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沈阳化工大学材料科学与工程学院沈阳 110142

Isospin effect in peripheral heavy-ion collisions at Fermi energies

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Isospin effect in peripheral heavy-ion collisions at Fermi energies

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