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Tsallis Statistics was used to investigate the non-Boltzmann distribution ofparticle spectra and their dependence on particle species and beam energy inthe relativistic heavy-ion collisions at SPS and RHIC. Produced particles areassumed to acquire radial flow and be of non-extensive statistics atfreeze-out. J/psi and the particles containing strangeness were examinedseparately to study their radial flow and freeze-out. We found that the strangehadrons approach equilibrium quickly from peripheral to central A+A collisionsand they tend to decouple earlier from the system than the light hadrons butwith the same final radial flow. These results provide an alternative pictureof freeze-outs: a thermalized system is produced at partonic phase; thehadronic scattering at later stage is not enough to maintain the system inequilibrium and does not increase the radial flow of the copiously producedlight hadrons. The J/psi in Pb+Pb collisions at SPS is consistent with earlydecoupling and obtains little radial flow. The J/psi spectra at RHIC are alsoinconsistent with the bulk flow profile.

Examine the species and beam-energy dependence of particle spectra using Tsallis Statistics