Abstract
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.
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