Systematics of directed and elliptic flow of light particles in heavy ion collisions in the 1A GeV regime ( ) [Ref.] W. Reisdorf et al. FOPI Collaboration.

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Presentation transcript:

Systematics of directed and elliptic flow of light particles in heavy ion collisions in the 1A GeV regime ( ) [Ref.] W. Reisdorf et al. FOPI Collaboration NPA(2012)

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 3 He) and 4 He comparison of directed flow of 3 H with 3 He

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 )

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

x (fm) Initialization Hard-sphere

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

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

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

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, (R) (2012) relative momenta: dp<0.25 GeV/c

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

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

Resluts: directed flow of proton

Resluts: directed flow of deuteron

Comparison with experimental data [Ref] W.Reisdorf et al. NPA (2012)

Comparison with experimental data

Resluts: elliptic flow of proton

Resluts: elliptic flow of deuteron

Elliptic flow of A3 (triton and He3)

Influence of Iso-MST on directed flow

Result from FOPI experiment V 1 slope E lab =400A MeV impact parameter b 0

Comparison of directed flow of 3 H with 3 He

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