| People hope to obtain the information of nuclear matter form the High-Densityphase and expansion state in heavy ion collisions. And then infer the equation of stateand get the kinetics information when the system evoluting. One of the most interestingsubjects is initial space and final momentum correlations. The anisotropic in initialspace transform to final momentum space.In the coordinate space, eccentricity usually stands for the asymmetry of particledistribution. And for different calculation method,the magnitude of eccentricity isslightly different. The current studies have demonstrated that the participant planeeccentricity closer to the real shape in the transverse plane. Even so, the information ofthe initial phase which getting the reaction region in collision process has be covered. Inthis paper, we evise the calculation method of participants plane eccentricity.In the momentum space, collective flow is usually used for discussing theasymmetry of the distribution. In the transverse pane,elliptic has been focused bystudies. In this article, the calculation method of elliptic flow will be introduced, andthe calculation method of coordinate space eccentricity is used in momentum space. It isdefined that reaction plan eccentricity and participant eccentricity in momentum, anddiscussed the effects of the thermalization and flow.There has some discussion about space-momenum correlations at RHIC energies.Because of the higher energy, the system is effected by two-body collisions only.AtAGS energies, the elliptic flow from negative to positive. The mean-filed, spectatorshadowing effects can’t be neglected. It is complex in the reaction region with timeevolution, because of that, it is show different characters on the space-momentumcorrelations from RHIC energies. This article simulate the reaction of Au+Au usingRQMD model at2AGeV. We do some event-by-event analysis on the transformation ofanisotropy and the participant effects in the revolution of system. |
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