dorsal/arxiv
View SchemaEffects of Compression and Collective Expansion on Particle Emission from Central Heavy-Ion Reactions
| Authors | P. Danielewicz |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9408018 |
| URL | https://arxiv.org/abs/nucl-th/9408018 |
| DOI | 10.1103/PhysRevC.51.716 |
| Journal | Phys.Rev.C51:716-750,1995 |
Abstract
Conditions under which compression occurs and collective expansion develops in energetic reactions of heavy nuclei, are analyzed, together with their effects on emitted light baryons and pions. Within transport simulations, it is shown that shock fronts perpendicular to beam axis form in head-on reactions. The fronts separate hot compressed matter from normal. As impact parameter increases, the angle of inclination of the fronts relative to beam axis decreases, and in-between the fronts a weak tangential discontinuity develops. Hot matter exposed to the vacuum in directions perpendicular to shock motion (and parallel to fronts), starts to expand sideways, early within reactions. Expansion in the direction of shock motion follows after the shocks propagate through nuclei, but due to the delay does not acquire same strength. Expansion affects angular distributions, mean-energy components, shapes of spectra and mean energies of different particles emitted into any one direction, and further particle yields. Both the expansion and a collective motion associated with the weak discontinuity, affect the magnitude of sideward flow within reaction plane. Differences in mean particle energy components in and out of the reaction plane in semicentral collisions, depend sensitively on the relative magnitude of shock speed in normal matter and speed of sound in hot matter.
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"abstract": "Conditions under which compression occurs and collective expansion develops\nin energetic reactions of heavy nuclei, are analyzed, together with their\neffects on emitted light baryons and pions. Within transport simulations, it is\nshown that shock fronts perpendicular to beam axis form in head-on reactions.\nThe fronts separate hot compressed matter from normal. As impact parameter\nincreases, the angle of inclination of the fronts relative to beam axis\ndecreases, and in-between the fronts a weak tangential discontinuity develops.\nHot matter exposed to the vacuum in directions perpendicular to shock motion\n(and parallel to fronts), starts to expand sideways, early within reactions.\nExpansion in the direction of shock motion follows after the shocks propagate\nthrough nuclei, but due to the delay does not acquire same strength. Expansion\naffects angular distributions, mean-energy components, shapes of spectra and\nmean energies of different particles emitted into any one direction, and\nfurther particle yields. Both the expansion and a collective motion associated\nwith the weak discontinuity, affect the magnitude of sideward flow within\nreaction plane. Differences in mean particle energy components in and out of\nthe reaction plane in semicentral collisions, depend sensitively on the\nrelative magnitude of shock speed in normal matter and speed of sound in hot\nmatter.",
"arxiv_id": "nucl-th/9408018",
"authors": [
"P. Danielewicz"
],
"categories": [
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],
"doi": "10.1103/PhysRevC.51.716",
"journal_ref": "Phys.Rev.C51:716-750,1995",
"title": "Effects of Compression and Collective Expansion on Particle Emission from Central Heavy-Ion Reactions",
"url": "https://arxiv.org/abs/nucl-th/9408018"
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