Effects of density-and momentum-dependent potentials in Au+Au collisions at intermediate energies

Wen-Jie Xie; Feng-Shou Zhang

doi:10.1088/1674-1137/42/10/104103

Chinese Physics C> 2018, Vol. 42> Issue(10) : 104103 DOI: 10.1088/1674-1137/42/10/104103

Effects of density-and momentum-dependent potentials in Au+Au collisions at intermediate energies

Wen-Jie Xie ¹ ,
Feng-Shou Zhang ²

1.
Department of Physical and Electronic Engineering, Yuncheng University, Yuncheng 044000, China
2.
The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China

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Abstract：
Based on an isospin-dependent transport model, the effects of the density-and momentum-dependent potentials are studied by simulating Au on Au collisions at 90, 120, 150 and 400 MeV/nucleon. It is found that the calculated results overestimate the experimental data on the directed flow and underestimate the data on the elliptic flow for protons. The impact of the density-and momentum-dependent potentials is observed in the mid-rapidity region of the final spectra. At 90 MeV/nucleon, the momentum-dependent potential has a larger impact on the observables than the density-dependent potential, and the elliptic flow has a higher value with the positive effective mass splitting. At 400 MeV/nucleon, however, the opposite is observed. The rapidity dependence of the elliptic flow for protons is sensitive to the symmetry energy. A soft symmetry energy corresponds to a higher value of the proton elliptic flow.
- symmetry energy ,
- effective mass splitting ,
- nuclear collective flow ,
- Au+Au collisions

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Wen-Jie Xie and Feng-Shou Zhang. Effects of density-and momentum-dependent potentials in Au+Au collisions at intermediate energies[J]. Chinese Physics C, 2018, 42(10): 104103. doi: 10.1088/1674-1137/42/10/104103

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Received: 2018-05-04

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Supported by National Natural Science Foundation of China (11505150), China Postdoctoral Science Foundation (2015M582730) and Yuncheng University Research Project (YQ-2014014).

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