Simulation for Elliptic Flow of UU Collisions at CSR Energy Region in Lanzhou

WU Ke-Jun; LUO Xiao-Feng; LIU Feng

Chinese Physics C> 2007, Vol. 31> Issue(7) : 617-620

Simulation for Elliptic Flow of UU Collisions at CSR Energy Region in Lanzhou

Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China2 University of Science and Technology of China, Hefei 230026,China

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Abstract：
We employ here a Relativistic Transport (ART) Model for Uranium $+$ Uranium collisions at E_b=0.52GeV/u. We study the impact parameter, rapidity and transverse momentum dependence of elliptic flow v₂ for nucleons and pions in two extreme orientation UU collisions. It indicates that elliptic flow of nucleons and pions are always out-of plane as a result of squeeze-out effect. The maximal absolute value of elliptic flow, which is about 12%, appears in body-body certral UU collisons when the initial spatial anisotropy reach the maximum. In minibias events, the magnitudes of elliptic flow are similar for mid-rapidity nucleons in tip-tip and body-body UU collisions, but which is smaller for mid-rapidity pions in tip-tip. Nucleons and pions are produced primarily by Δ decay at low transverse momentum and by participator rescattering at high transverse momentum. Thus, elliptic flow in tip-tip and body-body are similar and have a visible drop in higher transverse momentum (P_t>0.3GeV/c) as a result of spectators rescatterings and reabsorbtionas.

References

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WU Ke-Jun, LUO Xiao-Feng and LIU Feng. Simulation for Elliptic Flow of UU Collisions at CSR Energy Region in Lanzhou[J]. Chinese Physics C, 2007, 31(7): 617-620.

WU Ke-Jun, LUO Xiao-Feng and LIU Feng. Simulation for Elliptic Flow of UU Collisions at CSR Energy Region in Lanzhou[J]. Chinese Physics C, 2007, 31(7): 617-620. shu

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Received: 2006-11-02
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Simulation for Elliptic Flow of UU Collisions at CSR Energy Region in Lanzhou

Corresponding author: WU Ke-Jun,

Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China2 University of Science and Technology of China, Hefei 230026,China

Received Date: 2006-11-02
Accepted Date: 1900-01-01
Available Online: 2007-07-05

Abstract: We employ here a Relativistic Transport (ART) Model for Uranium $+$ Uranium collisions at E_b=0.52GeV/u. We study the impact parameter, rapidity and transverse momentum dependence of elliptic flow v₂ for nucleons and pions in two extreme orientation UU collisions. It indicates that elliptic flow of nucleons and pions are always out-of plane as a result of squeeze-out effect. The maximal absolute value of elliptic flow, which is about 12%, appears in body-body certral UU collisons when the initial spatial anisotropy reach the maximum. In minibias events, the magnitudes of elliptic flow are similar for mid-rapidity nucleons in tip-tip and body-body UU collisions, but which is smaller for mid-rapidity pions in tip-tip. Nucleons and pions are produced primarily by Δ decay at low transverse momentum and by participator rescattering at high transverse momentum. Thus, elliptic flow in tip-tip and body-body are similar and have a visible drop in higher transverse momentum (P_t>0.3GeV/c) as a result of spectators rescatterings and reabsorbtionas.