OPUS 4 | Universitätspublikationen

Prominent transverse flow of clusters in stopped Au(150 A MeV)+Au reactions (1995)

Jean Pierre Coffin C. Kuhn C. Roy C. Cerruti P. Crochet P. Fintz G. Guillaume A. Houari F. Jundt F. Rami L. Tizniti P. Wagner J. Konopka Horst Stöcker

Stopped Au(150 A MeV) + Au collisions have been measured with the FOPI-Detector at GSI by imposing an upper limit on the ratio of the global longitudinal momentum to the collected charge within an event.

Bose stimulated pion production in relativistic nuclear collisions (1995)

Igor N. Mishustin Leonid M. Satarov Joachim A. Maruhn Horst Stöcker Walter Greiner

We demonstrate the importance of the Bose-statistical effects for pion production in relativistic heavy-ion collisions. The evolution of the pion phase-space density in central collisions of ultrarelativistic nuclei is studied in a simple kinetic model taking into account the effect of Bose-simulated pion production by the NN collisions in a dense cloud of mesons.

pi-N correlations probe the nuclear equation of state in relativistic heavy ion-collisions (1995)

S. A. Bass C. Hartnack Horst Stöcker Walter Greiner

We investigate the sensivity of pionic bounce-off and squeeze-out on the density and momentum dependence of the real part of the nucleon optical potential. For the in-plane pion bounce-off we find a strong sensivity on both the density and momentum dependence whereas the out-of-plane pion squeeze-out shows a strong sensivity only towards the momentum dependence but little sensivity towards the density dependence.

Baryon-antibaryon pair production in time-dependent meson fields (1995)

Igor N. Mishustin Leonid M. Satarov Horst Stöcker Walter Greiner

Strong mean meson fields, which are known to exist in normal nuclei, experience a violent deformation in the course of a heavy-ion collision at relativistic energies. This may give rise to a new collective mechanism of the particle production, not reducible to the superposition of elementary nucleon-nucleon collisions.

High pT pions as probes of the dense phase of relativistic heavy ion collisions (1994)

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.

Monte Carlo model for multiparticle production at ultrarelativistic energies (1994)

N. S. Amelin Horst Stöcker Walter Greiner N. Armesto M. A. Braun C. Pajares

The Monte Carlo parton string model for multiparticle production in hadron-hadron, hadron-nucleus, and nucleus-nucleus collisions at high energies is described. An adequate choice of the parameters in the model gives the possibility of recovering the main results of the dual parton model, with the advantage of treating both hadron and nuclear interactions on the same footing, reducing them to interactions between partons. Also the possibility of considering both soft and hard parton interactions is introduced.

"Antiflow" of antiprotons in heavy ion collisions (1994)

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.

Intermediate mass dileptons from secondary Drell-Yan processes (1998)

Christian Spieles Lars Gerland Nils Hammon Marcus Bleicher Steffen A. Bass Horst Stöcker Walter Greiner C. Lourenco Ramona Vogt

Recent reports on enhancements of intermediate and hight mass muon pairs producedin heavy ion collisions have attracted much attention.

Dissociation of expanding c anti-c states in heavy ion collisions (1999)

Christian Spieles Ramona Vogt Lars Gerland Steffen A. Bass Marcus Bleicher Leonid Frankfurt Mark Strikman Horst Stöcker Walter Greiner

We study J/psi suppression in AB collisions assuming that the charmonium states evolve from small, color transparent configurations. Their interaction with nucleons and nonequilibrated, secondary hadrons is simulated using the microscopic model UrQMD. The Drell-Yan lepton pair yield and the J/psi Drell-Yan ratio are calculated as a function of the neutral transverse energy in Pb+Pb collisions at 160 GeV and found to be in reasonable agreement with existing data.

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