학술논문
K+- and K−-production in heavy-ion collisions at SIS energies
Document Type
Article
Author
Förster, A; Collaboration), (for the KaoS; Böttcher, I; Förster, A; Grosse, E; Koczoń, P; Kohlmeyer, B; Lang, S; Laue, F; Menzel, M; Naumann, L; Oeschler, H; Płoskoń, M; Pühlhofer, F; Scheinast, W; Schmah, A; Schuck, T; Schwab, E; Senger, P; Shin, Y; Ströbele, H; Sturm, C; Uhlig, F; Wagner, A; Waluś, W
Source
Journal of Physics G: Nuclear and Particle Physics; January 1, 2004, Vol. 30 Issue: 1 pS393-S400, 8p
Subject
Language
ISSN
09543899; 13616471
Abstract
The production and the propagation of K+- and of K−-mesons in heavy-ion collisions at beam energies of 1 to 2 A GeV 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 A GeV 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 K+. These observations indicate that K+-mesons decouple earlier from the reaction zone than K−-mesons.