1. Elliptic flow in heavy-ion collisions at intermediate energy: The role of impact parameter, mean field potential, and collision term.
- Author
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Gao, Bo, Wang, Yongjia, Gao, Zepeng, and Li, Qingfeng
- Subjects
- *
QUANTUM theory , *INDUCTIVE effect , *MOLECULAR dynamics , *HEAVY ion collisions , *PARTICLES (Nuclear physics) , *HEAVY-ion atom collisions - Abstract
Within the ultrarelativistic quantum molecular dynamics (UrQMD) model, by reversely tracing nucleons that are finally emitted at mid-rapidity (| y 0 | < 0.1) in the entire reaction process, the time evolution of elliptic flow (v 2) of these traced nucleons is studied in Au+Au collisions at beam energy of 0.4 GeV/nucleon with different impact parameters. The initial value of v 2 is positive and increases with impact parameter, it then decreases as time passes and tends to saturate at a negative value. It is found that nucleon-nucleon collisions always suppress the value of v 2 (enhance the out-of-plane emission), while the nuclear mean field potential effect is more complex, which depends on both impact parameter and reaction time. The most relevant density probed by v 2 of nucleons at mid-rapidity is found to be ∼ 60% of the maximum density reached during the collisions. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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