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The Simulated Analysis of Collective Flow by IQMD Model in AuAu Collisions at GSI Energy

Author: LiuChun
Tutor: HuoLei
School: Harbin Institute of Technology
Course: Particle Physics and Nuclear Physics
Keywords: High-energy heavy-ion collisions Collective Flow Reaction plane method
CLC: O571.5
Type: Master's thesis
Year: 2009
Downloads: 19
Quote: 0
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Abstract


Physics of high energy heavy ion collisions is one of the main purpose of nuclear matter under extreme conditions, the nature of the acquisition of nuclear matter equation of state. Collective flow of nuclear materials is the ability to react directly to achieve high density equation of state of nuclear matter linked to one of the physical observables , it reflects the nature of the collision early . In this energy region GSI studied the reaction products are mainly nuclear and lateral flow relatively large, middle rapidity elliptic flow is negative . Usually people use the reaction plane method analyze this energy region . In this paper, isospin quantum molecular dynamics model (IQMD) on GSI energy regions 0.4A GeV, 0.6AGeV, 0.8A GeV and 1.0A GeV several different energy heavy ion collisions were simulated and analyzed . On the impact parameter is 6fm AuAu collisions when doing the collective flow simulation , using the estimated reaction plane method for calculating collective flow program to do a more detailed discussion . Data were analyzed using IQMD model we studied the characteristics of the energy area , obtained from the model elliptic flow lateral flow and the true current value , and gives them with the transverse momentum and rapidity of change and found a large fast degrees lateral flow relatively large, elliptic flow rapidity in the middle when it is negative. Reaction plane with a real energy region for our study the reaction plane method were analyzed. Analysis of the first-order and second-order streams flow comparison of the estimated reaction plane , with the second-order flow can not directly obtain the reaction plane. Also discussed the autocorrelation in the case we studied the impact of autocorrelation is relatively large. Estimated reaction plane relative to the real existence of discrete reaction plane , which affects the accuracy of the flow value obtained should be corrected for this discrete , this last reaction plane method with an estimated current value is also seeking process, using several resolution different evaluation parameters. Through analysis, we get an accurate flow values.

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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > Nuclear physics > Neutron physics
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