Eur. Phys. J. C (1999) 6: 525-536
https://doi.org/10.1007/s100529800934

Mass number scaling in ultra-relativistic nuclear collisions from a hydrodynamical approach

¹ Fakultät für Physik, Universität Bielefeld, Germany
³ Department of Physics, University of Jyväskylä, Finland
² Institut für theoretische Physik, Universität Regensburg, D-93040, Regensburg, Germany

Received: 23 January 1998
Revised: 8 May 1998
Published online: 17 September 2013

Abstract

We study the different nucleus-nucleus collisions, O+Au, S+S, S+Ag, S+Au and Pb+Pb, at the CERN-SPS energy in a one-fluid hydrodynamical approach using a parametrization based on baryon stopping in terms of the thickness of colliding nuclei. Good agreement with measured particle spectra is achieved. We deduce the mass number scaling behaviour of the initial energy density. We find that the equilibration time is nearly independent of the size of the colliding nuclei.