2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/82739We study the time scale for pressure equilibration in heavy ion collisions at AGS energies within the three-fluid hydrodynamical model and a microscopic cascade model (UrQMD). We find that kinetic equilibrium is reached in both models after a time of 5 fm/c (center-of-mass time). Thus, observables which are sensitive to the early stage of the reaction differ considerably from the expectations within the instant thermalization scenario (one-fluid hydrodynamical model).to be published in GSI annual scientific report 1997, psfig style file neededNuclear Theorytext