Momentum-dependent potential and collective flows within the relativistic quantum molecular dynamics approach based on relativistic mean-field theory

被引：39

作者：

Nara, Yasushi ^{[1
,2
]}

Maruyama, Tomoyuki ^{[3
]}

Stoecker, Horst ^{[2
,4
,5
]}

机构：

[1] Akita Int Univ, Akita 0101292, Japan

[2] Frankfurt Inst Adv Studies, D-60438 Frankfurt, Germany

[3] Nihon Univ, Coll Bioresource Sci, Fujisawa, Kanagawa 2520880, Japan

[4] Goethe Univ Frankfurt, Inst Theoret Phys, D-60438 Frankfurt, Germany

[5] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

来源：

PHYSICAL REVIEW C | 2020年 / 102卷 / 02期

关键词：

HEAVY-ION COLLISIONS; PLUS AU COLLISIONS; EQUATION-OF-STATE; NUCLEAR-EQUATION; BUU APPROACH; SIDEWARD FLOW; ELLIPTIC FLOW; DIRECTED FLOW; BARYON FLOW; MATTER;

D O I：

10.1103/PhysRevC.102.024913

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Relativistic quantum molecular dynamics based on the relativistic mean field theory (RQMD.RMF) is extended by including momentum-dependent potential. The equation of state (EoS) dependence of the directed and the elliptic flow of protons in the beam energy range of 2.3 < root s(NN) < 20 GeV is examined. It is found that the directed flow depends strongly on the optical potential at high energies, root s(NN) > 3 GeV, where no information is available experimentally. The correlation between effective mass at saturation density and the optical potential is found: smaller values of effective mass require smaller strengths of the optical potential to describe the directed flow data. This correlation can also be seen in the beam energy dependence of the elliptic flow at root s(NN) > 3 GeV, although its effect is rather weak. On the other hand, stiff EoS is required to describe the elliptic flow at lower energies. Experimental constraints on the optical potential from pA collisions will provide important information on the EoS at high energies. The proton directed and the elliptic flow are well described in the RQMD.RMF model from root s(NN) = 2.3 to 8.8 GeV. In contrast, to reproduce the collapse of the directed flow above 10 GeV, pressure has to be reduced, which indicates a softening of the EoS around root s(NN) = 10 GeV.

引用

页数：11

共 120 条

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