Collective Motion Studying On XeXe Collisions At CSR Energy

Lattice QCD indicate that the chiral and deconfinement phase transitions are a smooth crossover on the temperature axis, while various models predict that the phase transition becomes of first order at high density. To map these components of the phase diagram on the phase diagram is one of the most challenging and stimulation subjects which may be achieved by relativistic heavy ion collision. At RHIC, BNL, and SPS at CERN, FAIR at GSI, the search for critical point and phase boundary is under way. Apart from these high temperature and low density region, various states can be find at the high density region.The Heavy Ion Research Facility in Lanzhou (HIRFL)-Cooler Storage Ring (CSR), which can get 500-1000MeV/u ion beam energy for external-target experiments, is one of the most important science engineering in China. It will make a significant contribution in the partonic matter search in high density region.Anisotropic flow carries information from the very early stage of the collision. Since 129Xe is one of the nuclei which can be extracted at CSR, using the Relativistic Transport Model (ART1.0), we study the dependence of collective motion effect of 129Xe nuclei with different beam energy. Just around CSR energy region, there is a clear peak of anisotropic flow. The system size dependence has also been studied. For different kinds of ions, the maximum of directed flows are at the same normalizing centrality. And we find that directed flow is very sensitive to the equation of state. They can provide us useful information at CSR energy region.