Bochum 1998 – wissenschaftliches Programm
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HK: Hadronen und Kerne
HK 46: Heavy Ion Reactions V, Ultrarelativistic Energies
HK 46.1: Gruppenbericht
Mittwoch, 18. März 1998, 14:00–14:30, P
Excitation Functions and Multisource-Behaviour in Relativistic Heavy Ion Collisions — •Sven Soff1,2, St. Bass1, St. Schramm2, J. Konopka1, Ch. Spieles1, M. Bleicher1, L. Gerland1, H. Weber1,2, Ch. Ernst1, M. Brandstetter1, M. Belkacem1, G. Mao1, St. Hofmann1, L. Neise1, H. Stöcker1, and W. Greiner1 — 1Inst. f. Theor. Physik, Postfach 111932, Universität Frankfurt, D-60054 Frankfurt — 2GSI Darmstadt, Postfach 110552, D-64220 Darmstadt
We present the Ultrarelativistic Quantum Molecular Dynamics Model (UrQMD) [1,2] and show its ingredients and how it performs in a couple of standard tests. Its capability to describe heavy ion collisions from low SIS energies (≈ 100 MeV/u) up to SPS energies (≈ 200 GeV/u) gives the unique possibility to study excitation functions in small steps. Here, we focus on actual experiments performed by the EOS collaboration in the energy region between SIS and AGS. Studying the azimuthal distributions of emitted particles at midrapidity a transition from the so-called squeeze-out to in-plane emission patterns is indicated when increasing the bombarding energy. In connection with the predicted break down of transverse sidewards flow and strong dependencies on model inputs as the equation of state most interesting questions are given. We also investigate the one-source-concept by doing a microscopic analysis of the complex substructure of the phase space distributions of the emitted particles [3].
[1] S.A.Bass et al., Prog. Rep. Part. Phys. (1997).
[2] M.Bleicher et al., to be published.
[2] S.Soff et al., to be published.
supported by BMBF, GSI, Graduiertenkolleg Exp. u. theor. Schwerionenphysik, and DFG.