Isospin dependence of relative yields of $K^+$ and $K^0$ mesons at 1.528 AGeV

Details Isospin dependence of relative yields of $K^+$ and $K^0$ mesons at 1.528 AGeV Isospin dependence of relative yields of $K^+$ and $K^0$ mesons at 1.528 AGeV

2007-01-04

arxiv.org/abs/nucl-ex/0701006v1

Phys.Rev.C75:011901,2007

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 3 figures. accepted for publication in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.75.011901

Results on $K^+$ and $K^0$ meson production in $^{96}_{44}$Ru + $^{96}_{44}$Ru and $^{96}_{40}$Zr + $^{96}_{40}$Zr collisions at a beam kinetic energy of 1.528$A$ GeV, measured with the FOPI detector at GSI-Darmstadt, are investigated as a possible probe of isospin effects in high density nuclear matter. The measured double ratio ($K^+/K^0$)$_{Ru}$/($K^+/K^0$)$_{Zr}$ is compared to the predictions of a thermal model and a Relativistic Mean Field transport model using two different collision scenarios and under different assumptions on the stiffness of the symmetry energy. We find a good agreement with the thermal model prediction and the assumption of a soft symmetry energy for infinite nuclear matter while more realistic transport simulations of the collisions show a similar agreement with the data but also exhibit a reduced sensitivity to the symmetry term.

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