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How to select out those collisions with the desired geometry such as tip-tipand/or body-body in experiment is one key point for performing high energy UUcollisions. With a relativistic transport model, we performed a simulation fordeformed UU collision with vast different orientations at CSR energy areacorresponding to the high net-baryon density region in QCD phase diagram. Byinvestigating the centrality and initial collision orientation dependence ofthe center baryon density, we found that the tip-tip like UU collisions withextended high density phase, which is very important for studying the nuclearEoS of high baryon density matter and the possible end-point of the phaseboundary, are those events with small initial orientations ($\leq20^{0}$) forbath projectile and target in reaction plane and small impact parameter($\leq2.6fm$). We pointed out quantificationally two observations --multiplicity of forward neutron and nuclear stopping power that both allows usto select out those most interesting events (i.e. tip-tip like), which will bevery helpful for the future experiments at performing UU collisions.

Initial orientation effect and selecting desired events in 520AMeV/u U-U collisions