Systematic Studies of Heavy Ion Collisions in theLow SIS Energy Region

LI Qingfeng; WANG Yongjia; GUO Chenchen; LI Zhuxia

doi:10.11804/NuclPhysRev.31.03.291

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LI Qingfeng, WANG Yongjia, GUO Chenchen, LI Zhuxia. Systematic Studies of Heavy Ion Collisions in theLow SIS Energy Region[J]. Nuclear Physics Review, 2014, 31(3): 291-305. doi: 10.11804/NuclPhysRev.31.03.291

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LI Qingfeng, WANG Yongjia, GUO Chenchen, LI Zhuxia. Systematic Studies of Heavy Ion Collisions in theLow SIS Energy Region[J]. Nuclear Physics Review, 2014, 31(3): 291-305. doi: 10.11804/NuclPhysRev.31.03.291

Systematic Studies of Heavy Ion Collisions in theLow SIS Energy Region

doi: 10.11804/NuclPhysRev.31.03.291

School of Science, Huzhou Teachers College, Huzhou 313000, Zhejiang, China;
College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2014-09-20

Abstract

After inserting the Skyrme potential energy density functional for potential update, more detailed medium modifications for nucleon-nucleon elastic cross sections, and the isospin effect for cluster recognition into the Ultra-relativistic Quantum Molecular Dynamics (UrQMD), the dynamic process of heavy ion collisions (HICs) at low SIS energies (about 40s400 MeV/u) is primarily studied. And, after systematically studying the emission and collective flows of light clusters from HICs in such beam energy region, the sensitive observables especially to the density dependent symmetry energy at supra-normal densities are focused. It is found that: (1)the initial neutron/proton ratio dependence of the balance energy of neutrons from mass-symmetric Sn isotopes can be taken as a useful probe to constrain the stiffness of the nuclear symmetry energy; (2) the transverse velocity/momentum dependence of the elliptic flow ratio of neutrons and protons or hydrogen isotopes (vn 2 =vp;H2 )is also sensitive to symmetry energy. The 2 analysis from the difference bet e the theoretical (taking Skyrme potential parametrizations with incompressibility K0 being almost same but the slope parameter L of symmetry energy being largely different) and experimental (taking FOPI/LAND data) vn 2 =vH2 values determines the value of L to be (89±45) MeV within in a χ² uncertainty.
- heavy ion collision,
- UrQMD model,
- equation of state,
- medium modification of cross section,
- symmetry energy
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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Systematic Studies of Heavy Ion Collisions in theLow SIS Energy Region

doi: 10.11804/NuclPhysRev.31.03.291

School of Science, Huzhou Teachers College, Huzhou 313000, Zhejiang, China;

College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2014-09-20

Key words:

Abstract: After inserting the Skyrme potential energy density functional for potential update, more detailed medium modifications for nucleon-nucleon elastic cross sections, and the isospin effect for cluster recognition into the Ultra-relativistic Quantum Molecular Dynamics (UrQMD), the dynamic process of heavy ion collisions (HICs) at low SIS energies (about 40s400 MeV/u) is primarily studied. And, after systematically studying the emission and collective flows of light clusters from HICs in such beam energy region, the sensitive observables especially to the density dependent symmetry energy at supra-normal densities are focused. It is found that: (1)the initial neutron/proton ratio dependence of the balance energy of neutrons from mass-symmetric Sn isotopes can be taken as a useful probe to constrain the stiffness of the nuclear symmetry energy; (2) the transverse velocity/momentum dependence of the elliptic flow ratio of neutrons and protons or hydrogen isotopes (vn 2 =vp;H2 )is also sensitive to symmetry energy. The 2 analysis from the difference bet e the theoretical (taking Skyrme potential parametrizations with incompressibility K0 being almost same but the slope parameter L of symmetry energy being largely different) and experimental (taking FOPI/LAND data) vn 2 =vH2 values determines the value of L to be (89±45) MeV within in a χ² uncertainty.

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