Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-01-08
Phys.Rev.C75:024906,2007
Physics
Nuclear Physics
Nuclear Experiment
accepted for publication in Phys. Rev. C 22 pages, 26 figures
Scientific paper
10.1103/PhysRevC.75.024906
This paper summarizes the yields and the emission patterns of K+ and of K- mesons measured in inclusive C+C, Ni+Ni and Au+Au collisions at incident energies from 0.6 AGeV to 2.0 AGeV using the Kaon Spectrometer KaoS at GSI. For Ni+Ni collisions at 1.5 and at 1.93 AGeV as well as for Au+Au at 1.5 AGeV detailed results of the multiplicities, of the inverse slope parameters of the energy distributions and of the anisotropies in the angular emission patterns as a function of the collision centrality are presented. When comparing transport-model calculations to the measured K+ production yields an agreement is only obtained for a soft nuclear equation of state (compression modulus KN ~ 200 MeV). The production of K- mesons at energies around 1 to 2 AGeV is dominated by the strangeness-exchange reaction K- N <-> pi Y (Y = Lambda, Sigma) which leads to a coupling between the K- and the K+ yields. However, both particle species show distinct differences in their emission patterns suggesting different freeze-out conditions for K+ and for K- mesons.
Boettcher Igor
Brill Dieter
Debowski M.
Dohrmann F.
Foerster Angela
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