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In the context of unified hydrodynamics, we discuss the pseudorapidity distributions of the charged particles produced in Au-Au and Cu-Cu collisions at the low RHIC energies of SNN~(1/2)= 19.6 and 22.4 GeV, respectively.It is found that the unified hydrodynamics alone can give a good description to the experimental measurements.This is different from the collisions at the maximum RHIC energy of SNN~(1/2)=200 GeV or at LHC energy of SNN~(1/2)=2.76 TeV, in which the leading particles must be taken into account so that we can properly explain the experimental observations.
In the context of unified hydrodynamics, we discuss the pseudorapidity distributions of the charged particles produced in Au-Au and Cu-Cu collisions at the low RHIC energies of SNN 1/2 (1/2) = 19.6 and 22.4 GeV, respectively. It is found that the unified hydrodynamics alone can give a good description to the experimental measurements. This is different from the collisions at the maximum RHIC energy of SNN ~ (1/2) = 200 GeV or at LHC energy of SNN ~ (1/2) = 2.76 TeV, in which the leading particles must be taken into account so that we can properly show the experimental observations.