Journalartikel
Autorenliste: Sahu, PK; Cassing, W
Jahr der Veröffentlichung: 2002
Seiten: 357-369
Zeitschrift: Nuclear Physics A: Nuclear and Hadronic Physics
Bandnummer: 712
Heftnummer: 3-4
ISSN: 0375-9474
eISSN: 1873-1554
Open Access Status: Green
DOI Link: https://doi.org/10.1016/S0375-9474(02)01287-3
Verlag: Elsevier
Abstract:
We study the proton sideward and elliptic differential flow for Au + An collisions at AGS energies (2-8 A GeV) in a microscopic relativistic transport model that includes all baryon resonances up to a mass of 2 GeV as well as string degrees of freedom for the higher hadronic excitations. In order to explore the sensitivity of the various differential flows to the nuclear equation of state (EoS) we use three different parameterizations of the scalar and vector mean-fields, i.e., NL2 (soft), NL23 (medium) and NU (hard), with their momentum dependence fitted to the experimental Schrodinger equivalent potential (at normal nuclear matter density rho(0)) up to kinetic energies of 1 GeV. We calculate the excitation function of sideward and elliptic flow within. these parameter sets for An + Au collisions and compare with the recent data from the E895 Collaboration as a function of rapidity, impact parameter and transverse momentum, respectively. We find that the best description of the differential data is provided by a rather 'stiff' EoS at 2 A GeV (NL3) while at higher bombarding energies (4-8 A GeV) a 'medium' EoS leads to the lowest chi(2) with respect to the data. However, the differences in the transverse and elliptic flows (from the different parameter sets) become of minor significance at 4-8 A GeV. We attribute this insensitivity to a similar reduction of the vector potential in all models and to the dominance of string degrees of freedom at these bombarding energies. (C) 2002 Elsevier Science B.V. All rights reserved.
Zitierstile
Harvard-Zitierstil: Sahu, P. and Cassing, W. (2002) Differential flow of protons in Au plus Au collisions at AGS energies, Nuclear Physics A: Nuclear and Hadronic Physics, 712(3-4), Article PII S0375-9474(02)01287-3. pp. 357-369. https://doi.org/10.1016/S0375-9474(02)01287-3
APA-Zitierstil: Sahu, P., & Cassing, W. (2002). Differential flow of protons in Au plus Au collisions at AGS energies. Nuclear Physics A: Nuclear and Hadronic Physics. 712(3-4), Article PII S0375-9474(02)01287-3, 357-369. https://doi.org/10.1016/S0375-9474(02)01287-3
Schlagwörter
BARYON FLOW; COLLECTIVE FLOW; ELLIPTIC FLOW; EQUATION-OF-STATE; HEAVY-ION COLLISIONS; HOT; NUCLEAR-EQUATION; relativistic heavy-ion collisions; relativistic models; SIDEWARD FLOW; SIGNATURE; SIS; TRANSPORT APPROACH