dorsal/arxiv
View SchemaBaryon flow from SIS to AGS energies
| Authors | P. K. Sahu, W. Cassing, U. Mosel, A. Ohnishi |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9907002 |
| URL | https://arxiv.org/abs/nucl-th/9907002 |
| DOI | 10.1016/S0375-9474(99)00854-4 |
| Journal | Nucl.Phys. A672 (2000) 376-386 |
Abstract
We analyze the baryon sideward and elliptic flow from SIS (0.25 $\sim$ 2 A GeV) to AGS (2 $\sim 11.0A$GeV) energies for Au + Au collisions in the relativistic transport model RBUU that includes all baryon resonances up to a mass of 2 GeV as well as string degrees of freedom for the higher mass continuum. There are two factors which dominantly determine the baryon flow at these energies: the momentum dependence of the scalar and vector potentials and the resonance-string degrees of freedom. We fix the explicit momentum dependence of the nucleon-meson couplings within the NL3 parameter set by the nucleon optical potential up to 1 GeV of kinetic energy. When assuming the optical potential to vanish identically for $E_{kin} \geq 3.5$ GeV we simultaneously reproduce the sideward flow data of the FOPI, EOS, E895 and E877 collaborations, the elliptic flow data of the EOS, E895 and E877 collaborations, and approximately the rapidity and transverse mass distribution of protons at AGS energies. The gradual change from hadronic to string degrees of freedom with increasing bombarding energy can be viewed as a transition from {\it hadronic} to {\it string} matter, i.e. a dissolution of hadrons.
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"abstract": "We analyze the baryon sideward and elliptic flow from SIS (0.25 $\\sim$ 2 A\nGeV) to AGS (2 $\\sim 11.0A$GeV) energies for Au + Au collisions in the\nrelativistic transport model RBUU that includes all baryon resonances up to a\nmass of 2 GeV as well as string degrees of freedom for the higher mass\ncontinuum. There are two factors which dominantly determine the baryon flow at\nthese energies: the momentum dependence of the scalar and vector potentials and\nthe resonance-string degrees of freedom. We fix the explicit momentum\ndependence of the nucleon-meson couplings within the NL3 parameter set by the\nnucleon optical potential up to 1 GeV of kinetic energy. When assuming the\noptical potential to vanish identically for $E_{kin} \\geq 3.5$ GeV we\nsimultaneously reproduce the sideward flow data of the FOPI, EOS, E895 and E877\ncollaborations, the elliptic flow data of the EOS, E895 and E877\ncollaborations, and approximately the rapidity and transverse mass distribution\nof protons at AGS energies. The gradual change from hadronic to string degrees\nof freedom with increasing bombarding energy can be viewed as a transition from\n{\\it hadronic} to {\\it string} matter, i.e. a dissolution of hadrons.",
"arxiv_id": "nucl-th/9907002",
"authors": [
"P. K. Sahu",
"W. Cassing",
"U. Mosel",
"A. Ohnishi"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/S0375-9474(99)00854-4",
"journal_ref": "Nucl.Phys. A672 (2000) 376-386",
"title": "Baryon flow from SIS to AGS energies",
"url": "https://arxiv.org/abs/nucl-th/9907002"
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