Helium-3 production from Pb+Pb collisions at SPS energies with the UrQMD model and the traditional coalescence afterburner

Li, Qingfeng; Wang, Yongjia; Wang, Xiaobao; Chun-lin, Shen

doi:10.1007/s11433-015-5775-3

Cited by 11 publications

(10 citation statements)

References 41 publications

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“…If we select two parameter sets of (R 0 , P 0 ), (3.5 fm, 0.3 GeV/c) and (3.8 fm, 0.3 GeV/c), which can both describe data well, it is found that the stopping times should be at 70 and 90 fm/c, respectively. This phenomenon was also seen in the previous work [17] even for higher SPS energies.…”

Section: The Urqmd and The Coalescence Model Settingssupporting

confidence: 88%

“…As a matter of experience, the values for the parameter set (R 0 , P 0 ) might be chosen in the range of (3-4 fm, 0.25-0.35 GeV/c) in order to describe experimental data from HICs at SIS, AGS, and even SPS energies. Within such a large beam energy region, the relativistic effect on δr and δp between two baryons have been taken into account by the well-known Lorentz transformation (LT) from the computational two-nucleus center-of-mass system to the local rest frame of two particles [16,17], and it is found that it has visible effect on light fragments, although not on free nucleons, which should be paid attention.…”

Section: The Urqmd and The Coalescence Model Settingsmentioning

confidence: 99%

“…produced in nucleon-induced spallation reactions. Quite recently, the traditional coalescence afterburner has been combined with a potential version of UrQMD model to explain the production of free protons and 3 He clusters from HICs at the Brookhaven Alternating Gradient Synchroton (AGS) and the CERN Super Proton Synchrotron (SPS) energies [16,17] and it was found that, with only one parameter set of (R 0 ,P 0 )=(3.8 fm, 0.3 GeV/c) but using different stopping times for the former dynamic process, the rapidity distribution of both yields can be described reasonably well.…”

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Influence of coalescence parameters on the production of protons and Helium-3 fragments

Wang

et al. 2016

Sci. China Phys. Mech. Astron.

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The time evolution of protons and 3 He fragments from Au+Au/Pb+Pb reactions at 0.25, 2, and 20 GeV/nucleon is investigated with the potential version of the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) model combined with the traditional coalescence afterburner. In the coalescence process, the relative distance R 0 and relative momentum P 0 are surveyed in the range of 3-4 fm and 0.25-0.35 GeV/c, respectively. For both clusters, a strong reversed correlation between R 0 and P 0 is seen and it is time-dependent as well. For protons, the accepted (R 0 , P 0 ) bands lie in the time interval 30-60 fm/c, while for 3 He, a longer time evolution (at about 60-90 fm/c) is needed. Otherwise, much smaller R 0 and P 0 values should be chosen. If we further look at the rapidity distributions from both central and semi-central collisions, it is found that the accepted [t cut , (R 0 , P 0 )] assemble can provide consistent results for proton yield and collective flows especially at mid-rapdities, while for 3 He, the consistency is destroyed at both middle and projectile-target rapidities. PACS numbers: 24.10.Lx, 25.75.Dw, 25.75.-q, 24.10.-i a E-mail address: liqf@hutc.zj.cn 1 I. MOTIVIATIONThe production mechanism of particles and nuclei is a fundamental and essential problem for the whole evolution of the universe. With the help of macroscopic and/or microscopic transport models for heavy ion collisions (HICs) within a large range of beam energies from the GSI Schwerionen Synchrotron (SIS) up to the BNL Relativistic Heavy Ion Collider (RHIC) and the CERN Large Hadron Collider (LHC) energies, the process of a complete compression and decompression from initial two colliding nuclei can be described dynamically, with the possible occurrence of (phase) transitions from nuclear liquid to gas (LG) or from quark-gluon plasma (QGP) to hadron gas (HG). Such a model is, e.g. the Ultrarelativistic Quantum Molecular Dynamics (UrQMD)[1, 2] [? ] . After that, an afterburner is usually chosen for the freezeout of various particles (free baryons, mesons, etc.) or fragments (deuterons, tritons, Helium isotopes, etc.) which can then be used for comparison with corresponding experimental data. It is unavoidable that the afterburner should be paid much more attention when a serious comparison between calculations and experiments is needed for extracting, although, mainly the information of the compression phase at the early stage. Therefore, a large amount of such models are available but active in different beam energy regions (with their own problems when describing data). At low bombarding energies from several tens to several hundreds MeV/nucleon, the statistical multifragmentation model (SMM) [3, 4], the statistical evaporation model (HIVAP) [5, 6] and the statistical model (GEMINI) [7] are frequently used; at energies from several hundreds MeV/nucleon to several GeV/nucleon, the conventional phase-space coalescence model "Minimum Spanning Tree" (MST) [8] as well as the Simulated Annealing Clusterisation Algorithm (SACA)[12] are t...

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Section: The Urqmd and The Coalescence Model Settingssupporting

confidence: 88%

Section: The Urqmd and The Coalescence Model Settingsmentioning

confidence: 99%

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confidence: 99%

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Influence of coalescence parameters on the production of protons and Helium-3 fragments

Wang

et al. 2016

Sci. China Phys. Mech. Astron.

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“…对UrQMD模型的平均场、碰撞项等部分做了相应的改进 [26][27][28][29][30][31][32][33][34][35][36] . 当前版本进一步引入了Skyrme能量密度泛函给出的表面能项、表面不对称项以及对称能项:…”

Section: 末态粒子动量空间方位角分布进行傅里叶展开即 Dnunclassified

Analysis of the dynamical mechanism for elliptic flow production in heavy-ion collisions at intermediate energies

Liu

et al. 2021

Sci. Sin.-Phys. Mech. Astron.

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摘要近年来, 椭圆流(v 2 )作为研究重离子碰撞动力学过程的重要观测量之一而备受关注. 本文基于极端相对论量子分子动力学(UrQMD)模型, 反向追踪反应末态处于中心快度区(|y 0 | < 0.1)的核子的演化过程, 探究这些核子的v 2 随时间的变化. 通过分别记录这些核子在平均场、核子-核子碰撞作用前后的v 2 来探究这两部分对v 2 产生的影响. 以入射能量为每核子0.4 GeV、碰撞参数为5 fm的Au+Au碰撞为例, 计算结果表明平均场对中心快度区核子的v 2 的贡献大约占30%, 而碰撞对它的贡献约占70%. 此外, 还发现不考虑碰撞项中的泡利阻塞效应时给出的v 2 比考虑泡利阻塞效应时的要大10%左右.

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“…The study of strongly interacting matter at extreme temperatures and densities is provided a chance by heavy ion collisions at ultrarelativistic energies [1][2][3][4][5]. The production mechanism of nuclei in ultrarelativistic heavy ion collisions deserves more investigation since it may give important message on the quantum chromodynamics (QCD) phase transition from quark-gluon plasma (QGP) to hadron gas (HG) [6,7]. The RHIC is scheduled to run at the energies which are around the critical energy of phase transition from hadronic matter to QGP [8].…”

Section: Introductionmentioning

confidence: 99%

Study of Production of (Anti-)deuteron Observed in Au+Au Collisions at $\sqrt{s_{NN}}$

Yuan

2021

Advances in High Energy Physics

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Transverse momentum distributions of deuterons and antideuterons in Au + Au collisions at s NN = 14.5 , 62.4, and 200 GeV with different centrality are studied in the framework of the multisource thermal model. Transverse momentum spectra are conformably and approximately described by the Tsallis distribution. The dependence of parameters (average transverse momenta, effective temperature, and entropy index) on event centrality is obtained. It is found that the parameters T increase and q decrease with increase of the average number of particles involved in collisions, which reveals the transverse excitation degree increases with collision centrality.

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Helium-3 production from Pb+Pb collisions at SPS energies with the UrQMD model and the traditional coalescence afterburner

Cited by 11 publications

References 41 publications

Influence of coalescence parameters on the production of protons and Helium-3 fragments

Influence of coalescence parameters on the production of protons and Helium-3 fragments

Analysis of the dynamical mechanism for elliptic flow production in heavy-ion collisions at intermediate energies

Study of Production of (Anti-)deuteron Observed in Au+Au Collisions at $\sqrt{s_{NN}}$

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Helium-3 production from Pb+Pb collisions at SPS energies with the UrQMD model and the traditional coalescence afterburner

Cited by 11 publications

References 41 publications

Influence of coalescence parameters on the production of protons and Helium-3 fragments

Influence of coalescence parameters on the production of protons and Helium-3 fragments

Analysis of the dynamical mechanism for elliptic flow production in heavy-ion collisions at intermediate energies

Study of Production of (Anti-)deuteron Observed in Au+Au Collisions at s NN

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Study of Production of (Anti-)deuteron Observed in Au+Au Collisions at $\sqrt{s_{NN}}$