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24 April 2024

» arxiv » nucl-ex/0411045

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Review of the results of the KaoS Collaboration
A. Foerster ; I. Boettcher ; F. Dohrmann ; A. Foerster ; E. Grosse ; P. Koczon ; B. Kohlmeyer ; S. Lang ; F. Laue ; M. Menzel ; L. Naumann ; H. Oeschler ; M. Ploskon ; F. Puehlhofer ; W. Scheinast ; A. Schmah ; T. Schuck ; E. Schwab ; P. Senger ; Y. Shin ; H. Stroebele ; C.Sturm ; F. Uhlig ; A. Wagner ; W. Walus ; for the KaoS-Collaboration ;
Date:	23 Nov 2004
Journal:	J.Phys. G31 (2005) S693-S700
Subject:	nucl-ex
Abstract:	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.
Source:	arXiv, nucl-ex/0411045
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