Relativistic kinetic approach to light nuclei production in high-energy nuclear collisions

Sun, Kai-Jia; Wang, Rui; Ko, Che Ming; Ma, Yu-Gang; Shen, Chun

doi:10.48550/arxiv.2106.12742

Cited by 8 publications

(10 citation statements)

References 51 publications

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“…In the full-ensemble scenario, the collision probability is reduced, i.e., P ij → P ij /N E , by the scaling σ * NN → σ * NN /N E . The above stochastic method has been generalized to the production of light nuclei through 3 ↔ 2 and 4 ↔ 2 scatterings, where the internal wave function and finite size of light nuclei have been taken into account [231].…”

Section: Collision Integralmentioning

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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Section: Collision Integralmentioning

confidence: 99%

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

Wolter,

Colonna,

Cozma

et al. 2022

Preprint

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“…[10,13] to the UrQMD approach and in Refs. [9,11,15,[58][59][60] to the AMPT model (a multi-phase transport model).…”

Section: B Phase Space Coalescence Approachmentioning

confidence: 99%

Deuteron Production in Ultra-Relativistic Heavy-Ion Collisions: A Comparison of the Coalescence and the Minimum Spanning Tree Procedure

Kireyeu¹,

Steinheimer²,

Aichelin³

et al. 2022

Preprint

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The formation of deuterons in heavy-ion collisions at relativistic energies is investigated by employing two recently advanced models -the Minimum Spanning Tree (MST) method and the coalescence model by embedding them in the PHQMD and the UrQMD transport approaches. While the coalescence mechanism combines nucleons into deuterons at the kinetic freeze-out hypersurface, the MST identifies the clusters during the different stages of time evolution. We find that both clustering procedures give very similar results for the deuteron observables in the UrQMD as well as in the PHQMD environment. Moreover, the results agree well with the experimental data on deuteron production in Pb+Pb collisions at √ sNN = 8.8 GeV (selected for the comparison of the methods and models in this study). A detailed investigation shows that the coordinate space distribution of the produced deuterons differs from that of the free nucleons and other hadrons. Thus, deuterons are not destroyed by additional rescattering.

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“…The production of light nuclei can be also described by the kinetic equations [33,34]. Especially recently, the relativistic kinetic equations with their nonlocal collision integrals were also solved for successfully describing light (anti-)nuclei production from the many-body scatterings in high-energy nuclear collisions [35].…”

Section: Introductionmentioning

confidence: 99%

Collision centrality and system size dependences of light nuclei production via dynamical coalescence mechanism

Cheng,

Zhang,

2021

Preprint

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Light (anti-)nuclei in relativistic heavy-ion collisions are considered to be formed by the coalescence mechanism of (anti-)nucleons in the present work. Using a dynamical phase-space coalescence model coupled with a multi-phase transport (AMPT) model, we explore the formation of light clusters such as deuteron, triton and their anti-particles in different centralities for 197 Au + 197 Au collisions at √ sNN = 39 GeV. The calculated transverse momentum spectra of protons, deuterons, and tritons are comparable to those of experimental data from the RHIC-STAR collaboration. Both coalescence parameters B2 for (anti-)deuteron and B3 for triton increase with the transverse momentum as well as the collision centrality, and they are comparable with the measured values in experiments. The effect of system size on the production of light nuclei is also investigated by 10 B + 10 B, 16 O + 16 O, 40 Ca + 40 Ca, and 197 Au + 197 Au systems in central collisions. The resultsshow that yields of light nuclei increase with system size, while the values of coalescence parameters present an opposite trend. It is interesting to see that the system size, as well as the centrality dependence of BA (A = 2, 3), falls into the same group, which further demonstrates production probability of light nuclei is proportional to the size of the fireball. Furthermore, we compare our coalescence results with other models, such as the thermal model and analytic coalescence model, it seems that the description of light nuclei production is consistent with each other.

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Relativistic kinetic approach to light nuclei production in high-energy nuclear collisions

Cited by 8 publications

References 51 publications

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

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

Deuteron Production in Ultra-Relativistic Heavy-Ion Collisions: A Comparison of the Coalescence and the Minimum Spanning Tree Procedure

Collision centrality and system size dependences of light nuclei production via dynamical coalescence mechanism

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