Isospin Effects on Pre-Equilibrium Nucleon Emission in Heavy-Ion Collisions

Chen Liewen; Zhang Xiaodong; Ge Lingxiao

Chinese Physics C> 1997, Vol. 21> Issue(S1) : 465-470

Isospin Effects on Pre-Equilibrium Nucleon Emission in Heavy-Ion Collisions

Institute of Modem Physics, Chinese Academy of Sciences, Lanzhou, China

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Abstract：
The isospin-dependent symmetry energy, Coulomb energy, and N-N cross sections are considered in the quantum molecular dynamics model. The influence of isospin effects on the emission of nucleons is discussed in the head-on collisions of the system ⁴⁰Ar + ⁴⁰Ar at the incident energy of 25 MeV/u. It is observed that the ratio of neutron to proton of pre-equilibrium emission is higher than that of the reaction system. It is found that the symmetry energy enhances the emission of neutron but reduces the emission of proton and that the isospin-dependent N-N cross sections favor the emission of both proton and neutron, but they seem to be more beneficial to the emission of protons.
- pre-equilibrium emission ,
- isospin effects ,
- nucleon-nucleon cross sections ,
- symmetry energy
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Chen Liewen, Zhang Xiaodong and Ge Lingxiao. Isospin Effects on Pre-Equilibrium Nucleon Emission in Heavy-Ion Collisions[J]. Chinese Physics C, 1997, 21(S1): 465-470.

Chen Liewen, Zhang Xiaodong and Ge Lingxiao. Isospin Effects on Pre-Equilibrium Nucleon Emission in Heavy-Ion Collisions[J]. Chinese Physics C, 1997, 21(S1): 465-470. shu

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Received: 1995-12-20

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Supported by the National Natural Science Foundation of China and LWTZ-1298, the Chinese Academy of Sciences.

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沈阳化工大学材料科学与工程学院沈阳 110142

Isospin Effects on Pre-Equilibrium Nucleon Emission in Heavy-Ion Collisions

Institute of Modem Physics, Chinese Academy of Sciences, Lanzhou, China

Received Date: 1995-12-20

Fund Project: Supported by the National Natural Science Foundation of China and LWTZ-1298, the Chinese Academy of Sciences.

Abstract: The isospin-dependent symmetry energy, Coulomb energy, and N-N cross sections are considered in the quantum molecular dynamics model. The influence of isospin effects on the emission of nucleons is discussed in the head-on collisions of the system ⁴⁰Ar + ⁴⁰Ar at the incident energy of 25 MeV/u. It is observed that the ratio of neutron to proton of pre-equilibrium emission is higher than that of the reaction system. It is found that the symmetry energy enhances the emission of neutron but reduces the emission of proton and that the isospin-dependent N-N cross sections favor the emission of both proton and neutron, but they seem to be more beneficial to the emission of protons.