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王永佳 兰州大学核科学与技术学院 合作者：郭琛琛 (北京师范大学) 导师：李庆峰(湖州师范学院理学院) 张鸿飞(兰州大学核科学与技术学院)

Systematics of directed and elliptic flow of light particles in heavy ion collisions in the 1A GeV regime. 王永佳 兰州大学核科学与技术学院 合作者：郭琛琛 (北京师范大学) 导师：李庆峰(湖州师范学院理学院) 张鸿飞(兰州大学核科学与技术学院). [Ref.] W. Reisdorf et al. FOPI Collaboration NPA(2012)876.1-60. Outline.

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王永佳 兰州大学核科学与技术学院 合作者：郭琛琛 (北京师范大学) 导师：李庆峰(湖州师范学院理学院) 张鸿飞(兰州大学核科学与技术学院)

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  1. Systematics of directed and elliptic flow of light particles in heavy ion collisions in the 1A GeV regime 王永佳 兰州大学核科学与技术学院 合作者：郭琛琛 (北京师范大学) 导师：李庆峰(湖州师范学院理学院) 张鸿飞(兰州大学核科学与技术学院) [Ref.] W. Reisdorf et al. FOPI Collaboration NPA(2012)876.1-60

  2. Outline Ultrarelativistic Quantum-Molecular-Dynamics (UrQMD) model Initialization potential updates--Skyrme potentials cross section---medium effect cluster construction Results yield collective flow of proton, deuteron, mass 3 (triton and 3He) and 4He comparison of directed flow of 3H with 3He

  3. Ultrarelativistic Quantum-Molecular-Dynamics (UrQMD) model study collisions of p+p, p+A and A+A systems at incident energies covered by INDRA/GSI experiments up to highest energies presently available at LHC/CERN. recently updates: various Skyrme interactions have been introduced, like ImQMD, LQMD momentum-modified density-dependent nucleon nucleon elastic cross section (NNECS) isospin denpendence in cluster recognition, iso-MST (minimum spanning tree )

  4. UrQMD Model: Initialization Woods-Saxon (WS) Hard-sphere (HS)

  5. x (fm) Initialization： Hard-sphere

  6. Potential updates like ImQMD,LQMD • potential energy density functional: Change the symmetry potential by varying the η • momentun dependent term: SkP (K=200MeV)

  7. Cross section [Ref] S.A. Bass et al. Prog.Part. Nucl. Phys. 41, 255 (1998)

  8. Momentum-modified density-dependent nucleon nucleon elastic cross section (NNECS) [Ref] Qingfeng Li et al. PRC 83.044617

  9. Cluster construction • minimum spanning tree (MST) relative distances : dr<2.8 fm relative momenta : dp<0.2 GeV/c • isospin dependent minimum spanning tree (Iso-MST) relative distances : 1. proton-proton, dr<2.5 fm 2. neutron-neutron, neutron-proton, dr<4.5 fm relative momenta : dp<0.2 GeV/c ImQMD: Yingxun Zhang and Zhuxia Li, et al. PRC 85, 051602(R) (2012) relative momenta: dp<0.25 GeV/c

  10. Resluts: yield Au+Au,b=0-2fm, SkP-FU3FP16,Hard-sphere

  11. Resluts: proton and deuteron yield Au+Au,b=0-2fm, SkP-FU3FP16,Hard-sphere

  12. Resluts: directed flow of proton

  13. Resluts: directed flow of proton

  14. Resluts: directed flow of deuteron

  15. Resluts: directed flow of deuteron

  16. Comparison with experimental data [Ref] W.Reisdorf et al. NPA876.1-60 (2012)

  17. Comparison with experimental data

  18. Comparison with experimental data

  19. Resluts: elliptic flow of proton

  20. Resluts: elliptic flow of deuteron

  21. Elliptic flow of A3 (triton and He3)

  22. Influence of Iso-MST on directed flow

  23. Result from FOPI experiment Elab=400A MeV V1 slope impact parameter b0

  24. Comparison of directed flow of 3H with 3He

  25. Comparison of directed flow of 3H with 3He

  26. Comparison of directed flow of 3H with 3He

  27. Summary • UrQMD model • Initialization • Skyrme potential • Cross section-- nuclear medium effect • Cluster recognition-MST, Iso-MST • Study of collective flow of p, d, A3, He4 in heavy ion collisions in the 1A GeV regime • Iso-MST influence on directed flow • Comparison of directed flow of 3H with 3He

  28. Thanks for your attention!

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