Dresden 2000 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 23: Physik mit schweren Ionen IV / Experiment und Theorie
HK 23.2: Gruppenbericht
Donnerstag, 23. März 2000, 14:45–15:15, B 114
Anti-Flow and the QGP Phase Transition of Nuclear Matter — •Sven Soff1,2, Jörg Brachmann2,1, Horst Stöcker2, and Walter Greiner2 — 1GSI Darmstadt, Postfach 110552, D-64220 Darmstadt — 2Inst. f. Theor. Physik, Postfach 111932, Universität Frankfurt, D-60054 Frankfurt
We investigate (anti-)flow in semi-peripheral nuclear collisions at AGS and SPS energies within macroscopic (3f-hydro) as well as microscopic (UrQMD) models. The hot and dense zone assumes the shape of an ellipsoid which is tilted by an angle θ with respect to the beam axis. If matter is close to the softest point of the equation of state, this ellipsoid expands predominantly orthogonal to the direction given by θ. This antiflow component is responsible for the previously predicted reduction of the directed transverse momentum around the softest point of the equation of state.
[1] J.Brachmann et al., Phys. Rev. C in print 1999.
[2] S.Soff et al., lanl-preprint archive: nucl-th/9903061. Supported by BMBF,DFG, and Graduiertenkolleg Theoretische und Experimentelle Schwerionenphysik.