Isospin dependence of relative yields of K+ and K0 mesons at 1.528A GeV

X. Lopez, Y. J. Kim, N. Herrmann, A. Andronic, V. Barret, Z. Basrak, N. Bastid, M. L. Benabderrahmane, R. Čaplar, E. Cordier, P. Crochet, P. Dupieux, M. Dželalija, Z. Fodor, I. Gašparić, Y. Grishkin, O. N. Hartmann, K. D. Hildenbrand, B. Hong, T. I. KangJ. Kecskemeti, M. Kirejczyk, M. Kiš, P. Koczon, M. Korolija, R. Kotte, A. Lebedev, Y. Leifels, M. Merschmeyer, W. Neubert, D. Pelte, M. Petrovici, F. Rami, W. Reisdorf, M. S. Ryu, A. Schüttauf, Z. Seres, B. Sikora, K. S. Sim, V. Simion, K. Siwek-Wilczyńska, V. Smolyankin, G. Stoicea, Z. Tyminski, P. Wagner, K. Wiśniewski, D. Wohlfarth, Z. G. Xiao, I. Yushmanov, X. Y. Zhang, A. Zhilin, G. Ferini, T. Gaitanos

Research output: Contribution to journalArticlepeer-review


Results on K+ and K0 meson production in 4496Ru + 4496Ru and 4096Zr + 4096Zr collisions at a beam kinetic energy of 1.528A 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+/K0)Ru/(K+/K0)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 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.

Original languageEnglish (US)
Article number011901
JournalPhysical Review C - Nuclear Physics
Issue number1
StatePublished - 2007

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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