dorsal/arxiv
View SchemaMicroscopic study of freeze-out in relativistic heavy ion collisions at SPS energies
| Authors | L. V. Bravina, I. N. Mishustin, J. P. Bondorf, Amand Faessler, E. E. Zabrodin |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9907061 |
| URL | https://arxiv.org/abs/nucl-th/9907061 |
| DOI | 10.1103/PhysRevC.60.044905 |
| Journal | Phys.Rev. C60 (1999) 044905 |
Abstract
The freeze-out conditions in the light (S+S) and heavy (Pb+Pb) colliding systems of heavy nuclei at 160 AGeV/$c$ are analyzed within the microscopic Quark Gluon String Model (QGSM). We found that even for the most heavy systems particle emission takes place from the whole space-time domain available for the system evolution, but not from the thin ''freeze-out hypersurface", adopted in fluid dynamical models. Pions are continuously emitted from the whole volume of the reaction and reflect the main trends of the system evolution. Nucleons in Pb+Pb collisions initially come from the surface region. For both systems there is a separation of the elastic and inelastic freeze-out. The mesons with large transverse momenta, $p_t$, are predominantly produced at the early stages of the reaction. The low $p_t$-component is populated by mesons coming mainly from the decay of resonances. This explains naturally the decreasing source sizes with increasing $p_t$, observed in HBT interferometry. Comparison with S+S and Au+Au systems at 11.6 AGeV/$c$ is also presented.
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"abstract": "The freeze-out conditions in the light (S+S) and heavy (Pb+Pb) colliding\nsystems of heavy nuclei at 160 AGeV/$c$ are analyzed within the microscopic\nQuark Gluon String Model (QGSM). We found that even for the most heavy systems\nparticle emission takes place from the whole space-time domain available for\nthe system evolution, but not from the thin \u0027\u0027freeze-out hypersurface\", adopted\nin fluid dynamical models. Pions are continuously emitted from the whole volume\nof the reaction and reflect the main trends of the system evolution. Nucleons\nin Pb+Pb collisions initially come from the surface region. For both systems\nthere is a separation of the elastic and inelastic freeze-out. The mesons with\nlarge transverse momenta, $p_t$, are predominantly produced at the early stages\nof the reaction. The low $p_t$-component is populated by mesons coming mainly\nfrom the decay of resonances. This explains naturally the decreasing source\nsizes with increasing $p_t$, observed in HBT interferometry. Comparison with\nS+S and Au+Au systems at 11.6 AGeV/$c$ is also presented.",
"arxiv_id": "nucl-th/9907061",
"authors": [
"L. V. Bravina",
"I. N. Mishustin",
"J. P. Bondorf",
"Amand Faessler",
"E. E. Zabrodin"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1103/PhysRevC.60.044905",
"journal_ref": "Phys.Rev. C60 (1999) 044905",
"title": "Microscopic study of freeze-out in relativistic heavy ion collisions at SPS energies",
"url": "https://arxiv.org/abs/nucl-th/9907061"
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