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Energy and centrality dependence of light nuclei production in relativistic heavy-ion collisions

Nuclear Science and Techniques 2022年第4期33卷 62-71页

作者： Li-Lin Zhu Bo Wang Meng Wang Hua Zheng Department of Physics Sichuan UniversityChengdu 610064China School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710119China

We study the energy and centrality dependence of deuteron and triton(helium-3)production in relativistic heavy-ion collisions at the BNL Relativistic heavy Ion Collider(RHIC)and CERN Large Hadron Collider(LHC)using the Tsallis distribution,blast-wave(BW)model,and stationary Fokker-Planck(FP)solution.Our study shows that good agreement can be reached between the fitting results from the stationary FP solution and the experimental data for Au+Au collisions from the beam energy scan(BES)program of RHIC at√SNN=7.7,11.5,14.5,19.6,27,39,62.4,and 200 GeV and for Pb+Pb collisions at√SNN=2.76 TeV.The Tsallis distribution and BW model can reasonably describe the deuteron and triton(helium-3)trans verse momentum spectra obtained at RHIC and LHC.A more comprehensive comparison among the three methods suggests that the stationary FP solution is a sensible method,which is able to describe the energy dependence of the light nuclei yield ratio N_(t)N_(p)/N_(d)^(2) and provide a coherent description of deuteron and triton(helium-3)production for all centralities and various colliding energies at RHIC and LHC.

关键词： Light nucleiproduction heavy-ioncollisions Tsallis distribution Blast-wavemodel Fokker–Planck solution

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Density fluctuations in intermediate-energy heavy-ion collisions

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Nuclear Science and Techniques 2022年第5期33卷 1-7页

作者： Cong Liu Xian-Gai Deng Yu-Gang Ma Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai 200438China

Within the framework of the isospin-dependent quantum molecular dynamics model,we simulate^(129)Xe+^(119)Sn collisions in an incident energy range of 20 to 190MeV/nucleon and discuss the liquid-gas phase transition with density fluctuations.For comparison,we also extract the effective Fisher parameter τ_(eff),multiplicity of intermediate-mass fragments(IMFs),and information entropy.It is found that the Fisher parameter and maximum information entropy of collisions have peak values at E_(beam)=50-80 MeV/nucleon.In addition,the maximum multiplicity of IMFs has a plateau around 70 MeV/nucleon.For higher-order density moments in a larger central region of[-5,5]^(3) fm^(3) in the collision system,a maximum plateau also appears as function of beam energy at energies exceeding 70 MeV/nucleon.These observables,which are consistent with each other,indicate a liquid-gas phase transition around 70 MeV/nucleon for the^(129)Xe+^(119)Sn system.

关键词： heavy-ioncollisions Liquid-gasphase transition IQMD Density moment Intermediatemass fragment Informationentropy Fisher-lawparameter

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