Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2004-11-23
J.Phys.G31:S693-S700,2005
Physics
Nuclear Physics
Nuclear Experiment
Invited talk given at the "Strange Quarks in Matter 2004" conference (SQM2004) in Capetwon, South Africa, September 2004. 9 pa
Scientific paper
10.1088/0954-3899/31/6/009
The production of K+ and of K- mesons in heavy-ion collisions at beam energies of 1 to 2 AGeV has systematically been investigated with the Kaon Spectrometer KaoS. The ratio of the K+ production excitation function for Au+Au and for C+C reactions increases with decreasing beam energy, which is expected for a soft nuclear equation-of-state. A comprehensive study of the K+ and of the K- emission as a function of the size of the collision system, of the collision centrality, of the kaon energy, and of the polar emission angle has been performed. The K-/K+ ratio is found to be nearly constant as a function of the collision centrality and can be explained by the dominance of strangeness exchange. On the other hand the spectral slopes and the polar emission patterns are different for K- and for K+. Furthermore the azimuthal distribution of the particle emission has been investigated. K+ mesons and pions are emitted preferentially perpendicular to the reaction plane as well in Au+Au as in Ni+Ni collisions. In contrast for K- mesons in Ni+Ni reactions an in-plane flow was observed for the first time at these incident enegies.
Boettcher Igor
Dohrmann F.
Foerster Angela
for the KaoS-Collaboration
Grosse Eckart
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