Pseudorapidity distributions of the produced charged particles in nucleus-nucleus collisions at low energies on the BNL Relativistic Heavy Ion Collider

摘要

The revised Landau hydrodynamic model is used to discuss the pseudorapiditydistributions of the produced charged particles in Au+Au and Cu+Cu collisionsat energies of sqrt(s_NN)= 19.6 and 22.4 GeV correspondingly on the BNLRelativistic Heavy Ion Collider. It is found that the revised Landauhydrodynamic model alone can give a good description to the experimentalmeasurements. This is different from that in the same collisions but at themaximum energy of sqrt(s_NN)= 200 GeV. Where, in addition to the revised Landauhydrodynamic model, the effects of leading particles have to be taken intoaccount in order to explain the experimental observations. It can be attributedto the different degrees of transparency of participants in different incidentenergies.