Application of microscopic transport model in the study of nuclear equation of state from heavy ion collisions at intermediate energies

Wang, Yongjia; Li, Qingfeng

doi:10.1007/s11467-020-0964-6

Cited by 27 publications

(9 citation statements)

References 175 publications

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“…For studying HICs at intermediate energies, the following density-and momentum-dependent potential form is frequently used in QMD-like models [34][35][36][37],…”

Section: Methodsmentioning

confidence: 99%

“…It is found experimentally that elliptic flow depends on beam energy, impact parameter, particle species, and colliding nuclei [12,27,28]. From theoretical point of view, v 2 strongly relates to the nuclear mean field potential and nucleonnucleon (NN) collisions [29][30][31][32][33][34][35]. However, a quantitative attribution of these effects to v 2 is still not very clear.…”

Section: Introductionmentioning

confidence: 99%

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Elliptic flow in heavy-ion collisions at intermediate energy: the role of impact parameter, mean field potential, and collision term

Gao¹,

Wang²,

Gao³

et al. 2022

Preprint

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Within the ultrarelativistic quantum molecular dynamics (UrQMD) model, by reverse tracing nucleons that are finally emitted at mid-rapidity (|y0| < 0.1) in the entire reaction process, the time evolution of elliptic flow (v2) of these traced nucleons produced in Au+Au collisions at beam energy of 0.4 GeV/nucleon with different impact parameters (b) is studied. The initial value of v2 is positive and increases with b, then it decreases as time passes and tends to saturate at a negative value. It is found that nucleon-nucleon collisions always depress the value of v2 (enhance the outof-plane emission), while the nuclear mean field potential may slightly raise the value of v2 during the expansion stage in peripheral reactions. The related density mostly probed by v2 of nucleons at mid-rapidity is found to be ∼ 60% of the maximum density reached during the collisions.

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“…For studying HICs at intermediate energies, the following density-and momentum-dependent potential form is frequently used in QMD-like models [34][35][36][37],…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Elliptic flow in heavy-ion collisions at intermediate energy: the role of impact parameter, mean field potential, and collision term

Gao¹,

Wang²,

Gao³

et al. 2022

Preprint

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“…[467], mean-field potentials with different parameter sets (e.g., different stiffness of the nuclear equation of state and different nucleon effective mass) were introduced, and potentials for Delta resonances were described in detail. More details about mean-field potentials for nucleons can be found in review papers [471,472].…”

Section: Mean-field Potentialmentioning

confidence: 99%

Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions

Wolter,

Colonna,

Cozma

et al. 2022

Preprint

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Transport models are the main method to obtain physics information on the nuclear equation of state and in-medium properties of particles from low to relativistic-energy heavy-ion collisions. The Transport Model Evaluation Project (TMEP) has been pursued to test the robustness of transport model predictions in reaching consistent conclusions from the same type of physical model. To this end, calculations under controlled conditions of physical input and set-up were performed with various participating codes. These included both calculations of nuclear matter in a box with periodic boundary conditions, which test separately selected ingredients of a transport code, and more realistic calculations of heavy-ion collisions. Over the years, five studies have been performed within this project. In this intermediate review, we summarize and discuss the present status of the project. We also provide condensed descriptions of the 26 participating codes, which contributed to some part of the project. These include the major codes in use today. After a compact description of the underlying transport approaches, we review the main results of the studies completed so far. They show, that in box calculations the differences between the codes can be well understood and a convergence of the results can be reached. These studies also highlight the systematic differences between the two families of transport codes, known under the names of Boltzmann-Uehling-Uhlenbeck (BUU) and Quantum Molecular Dynamics (QMD) type codes. However, when the codes were compared in full heavy-ion collisions using different physical models, as recently for pion production, they still yielded substantially different results. This calls for further comparisons of heavy-ion collisions with controlled models and of box comparisons of important ingredients, like momentum-dependent fields, which are currently underway. Our evaluation studies often indicate improved strategies in performing transport simulations and thus can provide guidance to code developers. Results of transport simulations of heavy-ion collisions from a given code will have more significance if the code can be validated against benchmark calculations such as the ones summarized in this review.

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“…The UrQMD model is one of microscopic models and extensively used in simulating the ultra-relativistic heavy ion collisions [31][32][33][34]. The mean field potential is taken into account as the collision c.m.…”

Section: A Urqmd Model and Coalescencementioning

confidence: 99%

“…The more details can be found in Refs. [31,33,34]. In many other works, thermal and statistical approaches are used to describe the production of light nuclei [35,36].…”

Section: A Urqmd Model and Coalescencementioning

confidence: 99%

Light nuclei production in Au + Au collisions at $\sqrt{s_{NN}}$ = 7.7-80 GeV from UrQMD model

Deng,

2020

Preprint

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Light nuclei production in relativistic 197 Au + 197 Au collisions from 7.7 to 80 GeV is investigated within the Ultra-relativistic-Quantum-Molecular-Dynamics model (UrQMD) with a naive coalescence approach. The results display the production of light nuclei at mid-rapidity can essentially match up the experimental data and a slight enhancement of combined ratio of NpNt/N 2 d , which is sensitive to the neutron density fluctuations, occurs at around 20 GeV. However, considering the present UrQMD does not include the critical end point, this enhanced NpNt/N 2 d ratio should be understood with caution. Furthermore, within different rapidity regions, the kinetic temperatures of different light nuclei are extracted by the Blast-wave model analysis and ratios among different light nuclei are also discussed.

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Application of microscopic transport model in the study of nuclear equation of state from heavy ion collisions at intermediate energies

Cited by 27 publications

References 175 publications

Elliptic flow in heavy-ion collisions at intermediate energy: the role of impact parameter, mean field potential, and collision term

Elliptic flow in heavy-ion collisions at intermediate energy: the role of impact parameter, mean field potential, and collision term

Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions

Light nuclei production in Au + Au collisions at $\sqrt{s_{NN}}$ = 7.7-80 GeV from UrQMD model

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