Systematic Studies on Transport Process of Heavy-ion Collisions at INDRA Energies and Detection of Symmetry Energy

LI Qingfeng; GUO Chenchen; WANG Yongjia

doi:10.11804/NuclPhysRev.30.03.331

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LI Qingfeng, GUO Chenchen, WANG Yongjia. Systematic Studies on Transport Process of Heavy-ion Collisions at INDRA Energies and Detection of Symmetry Energy[J]. Nuclear Physics Review, 2013, 30(3): 331-338. doi: 10.11804/NuclPhysRev.30.03.331

Citation:

LI Qingfeng, GUO Chenchen, WANG Yongjia. Systematic Studies on Transport Process of Heavy-ion Collisions at INDRA Energies and Detection of Symmetry Energy[J]. Nuclear Physics Review, 2013, 30(3): 331-338. doi: 10.11804/NuclPhysRev.30.03.331

Systematic Studies on Transport Process of Heavy-ion Collisions at INDRA Energies and Detection of Symmetry Energy

doi: 10.11804/NuclPhysRev.30.03.331

School of Science, Huzhou Teachers College, Huzhou 313000, Zhejiang, China;2.College of Physics Science & Technology, Shenyang Normal University, Shenyang 110034, China;3.School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2013-09-20

Abstract

The terms of initialization, equation of state (EoS), and two-body collision in the updated ultrarelativistic quantum molecular dynamics (UrQMD) model are examined in details so as to systematically study the collective flows and the nuclear stopping of free nucleons and light clusters from heavy-ion collisions at INDRA energies. It is seen that at INDRA energies the dynamic transport with a soft EoS with momentum dependence and with the momentum-modified density-dependent nucleon-nucleon elastic cross sections describes the directed flow exhibited by hydrogen isotopes (Z= 1) emitted at midrapidity fairly well. The sensitivity of the balance energy (Ebal) of the directed flow to the strength parameter of the density dependence of symmetry potential energy is further studied with the same parameter set. It is found that the Ebal of neutrons from HICs is particularly sensitive to the density dependence of the symmetry potential energy, while that of protons is not. And, the initial neutron/proton ratio dependence of the balance energy of neutrons from Sn isotopes can be taken as a useful probe to constrain the stiffness of the nuclear symmetry energy.
- heavy ion collision,
- UrQMD model,
- INDRA energy region,
- collective flow,
- balance energy
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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Systematic Studies on Transport Process of Heavy-ion Collisions at INDRA Energies and Detection of Symmetry Energy

doi: 10.11804/NuclPhysRev.30.03.331

School of Science, Huzhou Teachers College, Huzhou 313000, Zhejiang, China;2.College of Physics Science & Technology, Shenyang Normal University, Shenyang 110034, China;3.School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2013-09-20

Key words:

Abstract: The terms of initialization, equation of state (EoS), and two-body collision in the updated ultrarelativistic quantum molecular dynamics (UrQMD) model are examined in details so as to systematically study the collective flows and the nuclear stopping of free nucleons and light clusters from heavy-ion collisions at INDRA energies. It is seen that at INDRA energies the dynamic transport with a soft EoS with momentum dependence and with the momentum-modified density-dependent nucleon-nucleon elastic cross sections describes the directed flow exhibited by hydrogen isotopes (Z= 1) emitted at midrapidity fairly well. The sensitivity of the balance energy (Ebal) of the directed flow to the strength parameter of the density dependence of symmetry potential energy is further studied with the same parameter set. It is found that the Ebal of neutrons from HICs is particularly sensitive to the density dependence of the symmetry potential energy, while that of protons is not. And, the initial neutron/proton ratio dependence of the balance energy of neutrons from Sn isotopes can be taken as a useful probe to constrain the stiffness of the nuclear symmetry energy.

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