摘要
The ART model is applied to study the deformed UU collision at HIRFL-CSR energy area corresponding to the high baryon density region in the QCD phase diagram. The time evolution of central baryon （energy） densities in central collisions at Eb = 0.52 GeV/u shows that different orientation collisions will lead to different lifetimes of high density, especially tip-tip UU collisions which have an extend lifetime for the high density phase by almost a factor of 2 compared to the body-body orientation collisions. In order to pick out the interesting tip-tip like events from a mass of random orientation collisions, we study the relation between stopping power R and impact parameter b in different orientation collisions and find that it can enhance the purity of tip-tip like events when R increases. Therefore, the high density and long lifetime events can be effectively distinguished by R selection.
The ART model is applied to study the deformed UU collision at HIRFL-CSR energy area corresponding to the high baryon density region in the QCD phase diagram. The time evolution of central baryon （energy） densities in central collisions at Eb = 0.52 GeV/u shows that different orientation collisions will lead to different lifetimes of high density, especially tip-tip UU collisions which have an extend lifetime for the high density phase by almost a factor of 2 compared to the body-body orientation collisions. In order to pick out the interesting tip-tip like events from a mass of random orientation collisions, we study the relation between stopping power R and impact parameter b in different orientation collisions and find that it can enhance the purity of tip-tip like events when R increases. Therefore, the high density and long lifetime events can be effectively distinguished by R selection.
基金
Supported by the National Natural Science Foundation of China under Grant No 10775058, the Ministry of Education of China under Grant No IRT0624, the U.S. Department of Energy under Contract No DE-AC03-76SF00098, and Chinese Academy of Sciences under Grant Nos KJCX2-SW-N18 and CXTD-J2005-1.
