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Isospin effects of the Skyrme potential and the momentum dependent interaction at intermediate energy heavy ion collisions

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Chinese Physics C 2008年第3期32卷 172-176页

作者：郭文军刘建业 College of Science University of Shanghai for Science and TechnologyShanghai 200093China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Center of Theoretical Nuclear PhysicsNational Laboratory of Heavy Ion AcceleratorLanzhou 730000China

We improve the isospin dependent quantum molecular dynamical model by including isospin effects in the Skyrme potential and the momentum dependent interaction to obtain an isospin dependent Skyrme potential and an isospin dependent momentum interaction. We investigate the isospin effects of Skyrme potential and momentum dependent interaction on the isospin fractionation ratio and the dynamical mechanism in intermediate energy heavy ion collisions. It is found that the isospin dependent Skyrme potential and the isospin dependent momentum interaction produce some important isospin effects in the isospin fractionation ratio.

关键词： heavy ion collision isospin fractionation ratio isospin effect isospin dependent momentuminteraction isospin dependent Skyrme potential

Production cross section of neutron-rich calcium isotopes in heavy ion collisions

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Chinese Physics C 2015年第4期39卷 46-50页

作者：张冬红谢文杰苏军张丰收 Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and Technology Beijing Normal University Beijing Radiation Center Department of Physics Yuncheng University Sino-French Institute of Nuclear Engineering & Technology Sun Yat-sen University Center for Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou

Based on the isospin-dependent quantum molecular dynamics model along with the GEMINI model, heavy-ion collisions at intermediate energies are studied. We calculate the production cross sections of different fragments for reactions of 112Sn＋112Sn and 124Sn＋124Sn at different beam energies. The species and production cross sections of neutron-rich isotopes are generally dependent on the isospin of the system and the incident energies. The isotopes 48Ca and 54Ca are more productive for the neutron-rich system at 30 to 150 MeV/nucleon.

关键词： heavy ion collision isospin dependence production cross section of 54Ca

Nucleon effective mass splitting and density-dependent symmetry energy effects on elliptic flow in heavy ion collisions at Elab= 0.09 ~ 1.5 GeV/nucleon

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Chinese Physics C 2020年第7期44卷 103-110页

作者： Luyao Tong Pengcheng Li Fupeng Li Yongjia Wang Qingfeng Li Fanxin Liu Department of Physics Zhejiang University of TechnologyHangzhou 310023China School of Science Huzhou UniversityHuzhou 313000China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Institute of Modem Physics Chinese Academy of SciencesLanzhou 730000China

By incorporating an iso spin-dependent form of the momentum-dependent potential in the ultra-relativistic quantum molecular dynamics(UrQMD)model,we systematically investigate effects of the neutron-proton effective mass splitting m*n-p=m*n-m*p/m and the density-dependent nuclear symmetry energy Esym(ρ)on the elliptic flow v2 in197Au+197 Au collisions at beam energies from 0.09 to 1.5 GeV/*** is found that at higher beam energies(≥0.25 GeV/nucleon)with the approximately 75 MeV difference in slopes of the two different Esym(ρ),and the variation of m*n-p ranging from-0.03 to 0.03 at saturation density with isospin asymmetryδ=(ρn-ρp)/ρ-0.2,the Esym(ρ)has a stronger influence on the difference in v2 between neutrons and protons,i.e.,v2n-v2p,than m*n-p ***,at lower beam energies(≤0.25 GeV/nucleon),v2n-v2p is sensitive to both the Esym(ρ)and the m****,the influence of m*n-p on v2n-v2p is more evident with the parameters of this study when using the soft,rather than stiff,symmetry energy.

关键词： nuclear symmetry energy heavy ion collision elliptic flow

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

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Frontiers of physics 2020年第4期15卷 133-151页

作者： Yong-Jia Wang Qing-Feng Li School of Science Huzhou UniversityHuzhou 313000China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

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 *** knowledge of the nuclear EOS is essential for studying the propertics of muclei,the structure of neutron stars,the dynamics of heavy ion collision(HIC),as well as neutron star *** offers a unique way to create muclear 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 ***,transport models which often incorporate phenomenological potentials as an input are utilized to deduce the EOS from the comparison with the observables mcasured in *** 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 nmuclear 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 *** this article we highlight our recent results on the studies of the muclear EOS and the muclear symmetry energy with the UrQMD *** opportunities and challenges in the extraction of the nuclear EOS from transport models and HIC experiments are discussed.

关键词： muclear equation of state symmetry energy heavy ion collision transport model

Production of X_(eses)in heavy ion collisions

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Chinese Physics C 2023年第5期47卷 1-5页

作者：胡元元张辉 Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum MatterSouth China Normal UniversityGuangzhou 510006China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing CenterSouth China Normal UniversityGuangzhou 510006China

The yields of X_(cscs)with its two possible configurations,i.e.,the hadronic molecular state and tetraquark state,for Pb-Pb collisions at√sNN=5.02 TeV is studied.A volume effect is found from the centrality distribution of X_(cscs),which could help to distinguish the inner structure of X_(cscs).We also show the rapidity and the transverse momentum distributions of X_(cscs) production as well as its elliptic flow coefficient as a function of the transverse momentum.

关键词： heavy ion collision exotic hadron hadronic molecular state tetraquark state

Influence of Chiral Mean Field on Kaon In-plane Flow in heavy ion collisions

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Communications in Theoretical Physics 2004年第5期41卷 746-750页

作者： ZHENGYu-Ming FUCHSChristian FAESSLERAmand SHEKHTERKirril SRISAWADPornrad KOBDAJChinorat YANYu-Peng ChinaInstituteofAtomicEnergy P.O.Box275（18）Beijing102413China 4InstitutfǖrTheoretischePhysikderUniversitātTǖbingen D-72076TǖbingenGermany SchoolofPhysics SuranarreUniversityofTechnologyNakhonRatchasima30000Thailand

The influence of the chiral mean field on the in-plane flow in heavy ion collisions at SIS energy is investigated within covariant kaon dynamics. For the kaon mesons inside the nuclear medium a quasi-particle picture including scalar and vector fields is adopted and compared to the standard treatment with a static potential. It is confirmed that a Lorentz force from spatial component of the vector field provides an important contribution to the in-medium kaon dynamics and strongly counterbalances the influence of the vector potential on the in-plane flow. The calculated results show that the new FOPI data can be reasonably described using the Brown & Rho parametrization, which partly takes into account the correction of higher order contributions in the chiral expansion. This indicates that one can abstract the information on the kaon potential in a nuclear medium from the analysis of the in-plane flow.

关键词： kaon in-plane flow kaon mean field covariant kaon dynamics heavy ion collision

Probing the color structure of the perfect QCD fluids via soft-hard-event-by-event azimuthal correlations

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Chinese Physics C 2018年第10期42卷 127-133页

作者： Shuzhe Shi Jinfeng Liao Miklos Gyulassy Physics Department and Center for Exploration of Energy and Matter Indiana University Nuclear Science Division Lawrence Berkeley National Laboratory Pupin Lab MS-5202 Department of Physics Columbia University Institute of Particle Physics and Key Laboratory of Quark & Lepton Physics (MOE) Central China Normal University

We develop a comprehensive dynamical framework, CIBJET, to calculate on an event-by-event basis the dependence of correlations between soft （PT 〈2 GeV） and hard （PT 〉 10 GeV） azimuthal flow angle harmonics on the color composition of near-perfect QCD fluids produced in high energy nuclear collisions at RHIC and LHC. CIBJET combines consistently predictions of event-by-event VISHNU2＋I viscous hydrodynamic fluid fields with CUJET3.1 predictions of event-by-event jet quenching. We find that recent correlation data favor a temperature dependent color composition including bleached chromo-electric q（T）＋g（T） components and an emergent chromo-magnetic degrees of freedom re（T） consistent with non-perturbative lattice QCD information in the confinement/deconfinement temperature range.

关键词： quark-gluon plasma heavy ion collision jet quenching confinement

Properties of the QCD matter:review of selected results from the relativistic heavy ion collider beam energy scan(RHIC BES)program

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Nuclear Science and Techniques 2024年第12期35卷 274-311页

作者： Jin‑Hui Chen Xin Dong Xiong‑Hong He Huan‑Zhong Huang Feng Liu Xiao‑Feng Luo Yu‑Gang Ma Li‑Juan Ruan Ming Shao Shu‑Su Shi Xu Sun Ai‑Hong Tang Ze‑Bo Tang Fu‑Qiang Wang Hai Wang Yi Wang Zhi‑Gang Xiao Guan‑Nan Xie Nu Xu Qing‑Hua Xu Zhang‑Bu Xu Chi Yang Shuai Yang Wang‑Mei Zha Ya‑Peng Zhang Yi‑Fei Zhang Jie Zhao Xiang‑Lei Zhu Key Laboratory of Nuclear Physics and ion‑Beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Nuclear Science Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA QMRC Institute of Modern PhysicsChinese Academy of SciencesLanzhouChina Department of Physics and Astrophysics University of CaliforniaLos AngelesCA 90095USA Key Laboratory of Quark and Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China Department of Physics Brookhaven National LaboratoryUptonNY 11973USA Department of Modern Physics University of Science and Technology of ChinaHefeiChina Department of Physics Purdue UniversityWest LafayetteIN 47907USA Department of Engineering Physics Tsinghua UniversityBeijingChina Department of Physics Tsinghua UniversityBeijingChina School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Physics and Particle Irradiation(MOE) Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237China Department of Physics Kent State UniversityKentOH 44242USA Institute of Quantum Matter South China Normal UniversityGuangzhou 510006China

In the paper,we discuss the development of the multigap resistive plate chamber time-of-fight(TOF)technology and the production of the solenoidal tracker at RHIC(STAR)TOF detector in China at the beginning of the twenty-frst ***,recent experimental results from the frst beam energy scan program(BES-I)at the Relativistic heavy ion Collider(RHIC)pertaining to measurements of collectivity,chirality,criticality,global polarization,strangeness,heavy favor,dilepton and light nuclei productions are reviewed.

关键词： heavy ion collision Quark-gluon plasma QCD phase diagram Collectivity Chirality Criticality

Shear Viscosity to Entropy Density Ratio in Au+Au Central collisions

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Plasma Science and Technology 2012年第7期14卷 585-587页

作者：周铖龙马余刚方德清 Shanghai Institute of Applied Physics Chinese Academy of Sciences Graduate School of Chinese Academy of Sciences

The shear viscosity （7） and entropy density （s） are studied for the central Au＋Au collisions with the help of a microscopic transport model, namely the isospin-dependent quantum molecular dynamic model （IQMD）. Employ the formula given in Ref. [1],η is calculated as a time dependent variable for different incident energies from 40 MeV/u to 120 MeV/u and the energy dependence of η/s of nuclear matter in the most compressed stage in collision process is displayed.

关键词： shear viscosity entropy density heavy ion collision