Application of microscopic transport model in the study of nuclear equation of state from heavy ion collisions at intermediate energies
Application of microscopic transport model in the study of nuclear equation of state from heavy ion collisions at intermediate energies
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微观输运模型在中能重离子碰撞核状态方程研究中的应用
DOI：
10.1007/s11467-020-0964-6
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发表时间：
2020-04
影响因子：
7.5
通讯作者：
Li Qingfeng
中科院分区：
文献类型：
--
作者：
Wang Yongjia;Li Qingfeng
核物质的状态方程，即每个核子的结合能、温度、密度以及同位旋不对称性之间的热力学关系，长期以来一直是核物理和天体物理的研究热点。核状态方程的知识对于研究原子核的性质、中子星的结构、重离子碰撞(HIC)的动力学以及中子星的合并都是必不可少的。HIC提供了一种在地面实验室中产生高密度和同位旋不对称核物质的独特方法，但形成的致密核物质只存在很短的时间，不能在实验中直接测量核状态方程。实际上，输运模型常常包含唯象学势作为输入，通过与实验室测量的可观测数据的比较来推导状态方程。超相对论量子分子动力学(UrQMD)模型已被广泛用于研究从费米能量(每个核子40 MeV)到CERN大型强子对撞机能量(TeV)的HIC。通过进一步改进UrQMD模型中的核平均场势项、碰撞项和团簇识别项，可以再现FOPI合作新测量的轻带电粒子的集体流和核停止数据。在这篇文章中，我们重点介绍了我们用UrQMD模型研究原子核状态方程和核对称能的最新结果。讨论了从输运模型和HIC实验中提取核状态方程的新机遇和新挑战。
The equation of state(EOS) of nuclear matter, i.e., the thermodynamic relationship between the binding energy per nucleon, temperature, density, as well as the isospin asymmetry, has been a hot topic in nuclear physics and astrophysics for a long time. The knowledge of the nuclear EOS is essential for studying the properties of nuclei, the structure of neutron stars, the dynamics of heavy ion collision(HIC), as well as neutron star mergers. HIC offers a unique way to create nuclear matter with high density and isospin asymmetry in terrestrial laboratory, but the formed dense nuclear matter exists only for a very short period, one cannot measure the nuclear EOS directly in experiments. Practically, transport models which often incorporate phenomenological potentials as an input are utilized to deduce the EOS from the comparison with the observables measured in laboratory. The ultrarelativistic quantum molecular dynamics(UrQMD) model has been widely employed for investigating HIC from the Fermi energy(40 MeV per nucleon) up to the CERN Large Hadron Collider energies(TeV). With further improvement in the nuclear mean-field potential term, the collision term, and the cluster recognition term of the UrQMD model, the newly measured collective flow and nuclear stopping data of light charged particles by the FOPI Collaboration can be reproduced. In this article we highlight our recent results on the studies of the nuclear EOS and the nuclear symmetry energy with the UrQMD model. New opportunities and challenges in the extraction of the nuclear EOS from transport models and HIC experiments are discussed.
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DOI：
10.1016/s0375-9474(98)00413-8
发表时间：
1998-02
期刊：
Nuclear Physics
影响因子：
--
作者：
J. Ollitrault
通讯作者：
J. Ollitrault
影响因子：
3.1
作者：
Y. Zhang;Zhu-xia Li
通讯作者：
Y. Zhang;Zhu-xia Li
影响因子：
3.1
作者：
Qingfeng Li;Zhu-xia Li;E. Zhao
通讯作者：
Qingfeng Li;Zhu-xia Li;E. Zhao
费米能域重离子碰撞中的集体流动和核停止
影响因子：
2.8
作者：
Peng-Cheng Li;Yong-Jia Wang;Qing-Feng Li;Hong-Fei Zhang
通讯作者：
Hong-Fei Zhang
影响因子：
3.1
作者：
D. Coupland;W. G. Lynch;M. Tsang;P. Danielewicz;Y. Zhang
通讯作者：
D. Coupland;W. G. Lynch;M. Tsang;P. Danielewicz;Y. Zhang