Universitätspublikationen
3 search hits
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A Stopped delta-matter source in heavy ion collisions at 10-GeV/N?
(1994)
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Markus Hofmann
Raffaele Mattiello
Heinz Sorge
Horst Stöcker
Walter Greiner
- We predict the formation of highly dense baryon-rich resonance matter in Au+Au collisions at AGS energies. The final pion yields show observable signs for resonance matter. The Delta1232 resonance is predicted to be the dominant source for pions of small transverse momenta. Rescattering e ects consecutive excitation and deexcitation of Delta's lead to a long apparent life- time (> 10 fm/c) and rather large volumina (several 100 fm3) of the Delta-matter state. Heavier baryon resonances prove to be crucial for reaction dynamics and particle production at AGS.
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High pT pions as probes of the dense phase of relativistic heavy ion collisions
(1994)
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S. A. Bass
C. Hartnack
Horst Stöcker
Walter Greiner
- The properties of pions from the hot and dense reaction stage of relativistic heavy ion collisions are investigated with the quantum molecular dynamics model. Pions originating from this reaction stage stem from resonance decay with enhanced mass. They carry high transverse momenta. The calculation shows a direct correlation between high pt pions, early freeze-out times and high freeze-out densities.
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"Antiflow" of antiprotons in heavy ion collisions
(1994)
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André Jahns
Christian Spieles
Heinz Sorge
Horst Stöcker
Walter Greiner
- In the framework of the relativistic quantum dynamics approach we investigate antiproton observables in Au-Au collisions at 10.7A GeV. The rapidity dependence of the in-plane directed transverse momentum p(y) of p's shows the opposite sigh of the nucleon flow, which has indeed recently been discovered at 10.7A GeV by the E877 group. The "antiflow" of p's is also predicted at 2A GeV and at 160 A GeV and appears at all energies also for pi's and K's. These predicted p anticorrelations are a direct proof of strong p annihilation in massive heavy ion reactions.
