K+ and K- production in heavy-ion collisions at SIS-energies

Details K+ and K- production in heavy-ion collisions at SIS-energies K+ and K- production in heavy-ion collisions at SIS-energies

2003-07-23

arxiv.org/abs/nucl-ex/0307018v1

J.Phys.G30:S393,2004

Physics

Nuclear Physics

Nuclear Experiment

invited talk given at the SQM2003 conference in Atlantic Beach, USA (March 2003), to be published in Journal of Physics G, 10p

Scientific paper

10.1088/0954-3899/30/1/047

The production and the propagation of K+ and of K- mesons in heavy-ion collisions at beam energies of 1 to 2 AGeV have systematically been investigated with the Kaon Spectrometer KaoS at the SIS at the GSI. 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. At 1.5 AGeV 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. The spectral slopes and the polar emission patterns are different for K- and for K+. These observations indicate that K+ mesons decouple earlier from the reaction zone than K- mesons.

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