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

Abstract : 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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http://hal.in2p3.fr/in2p3-00133374
Contributor : Jeanine Pellet <>
Submitted on : Monday, February 26, 2007 - 12:54:05 PM
Last modification on : Tuesday, May 4, 2021 - 11:26:07 AM

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X. Lopez, Y. J. Kim, N. Herrmann, A. Andronic, V. Barret, et al.. Isospin dependence of relative yields of $K^+$ and $K^0$ mesons at 1.528 A GeV. Physical Review C, American Physical Society, 2007, 75, pp.011901. ⟨10.1103/PhysRevC.75.011901⟩. ⟨in2p3-00133374⟩

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