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The freeze-out conditions in the light (S+S) and heavy (Pb+Pb) collidingsystems of heavy nuclei at 160 AGeV/$c$ are analyzed within the microscopicQuark Gluon String Model (QGSM). We found that even for the most heavy systemsparticle emission takes place from the whole space-time domain available forthe system evolution, but not from the thin ''freeze-out hypersurface", adoptedin fluid dynamical models. Pions are continuously emitted from the whole volumeof the reaction and reflect the main trends of the system evolution. Nucleonsin Pb+Pb collisions initially come from the surface region. For both systemsthere is a separation of the elastic and inelastic freeze-out. The mesons withlarge transverse momenta, $p_t$, are predominantly produced at the early stagesof the reaction. The low $p_t$-component is populated by mesons coming mainlyfrom the decay of resonances. This explains naturally the decreasing sourcesizes with increasing $p_t$, observed in HBT interferometry. Comparison withS+S and Au+Au systems at 11.6 AGeV/$c$ is also presented.Comment: REVTEX, 26 pages incl. 9 figures and 2 tables, to be published in the  Physical Review

physical review. c. nuclear physics/physical review. c, nuclear physics

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Microscopic study of freeze-out in relativistic heavy-ion collisions at160AGeV/cenergy