Kinetic freeze-out conditions in nuclear collisions with 2A-158A GeV beam energy within a non-boost-invariant blast-wave model

Abstract

We study the kinetic freeze-out conditions of bulk hadrons in nuclear collisions. The transverse and longitudinal momentum spectra of the identified hadrons produced in central Au+Au and Pb+Pb collisions, in the beam energy range of Elab=2A-158A GeV are analyzed for this purpose, within a generalized non-boost-invariant blast-wave model. The kinetic freeze-out temperature is found to vary in the range of 55-90 MeV, whereas the average transverse velocity of collective expansion is found to be around 0.5c-0.6c. The mean longitudinal velocity of the fireball is seen to increase monotonically with increasing longitudinal boost. The results would be useful to understanding the gross collision dynamics for the upcoming experiments at the GSI Facility for Antiproton and Ion Research and Nuclotron-based Ion Collider fAcility at JINR. © 2018 American Physical Society.