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Physical Review C 76 (2007) 024906
K0 and Lambda production in Ni+Ni collisions near threshold
M. Merschmeyer, X. Lopez, N. Bastid1, P. Crochet1, N. Herrmann, A. Andronic, V. Barret1, Z. Basrak, M. L. Benabderrahmane, R. Caplar, E. Cordier, P. Dupieux1, M. Dzelalija, Z. Fodor, I. Gasparic, Y. Grishkin, O. N. Hartmann, K. D. Hildenbrand, B. Hong, T. I. Kang, J. Kecskemeti, Y. J. Kim, M. Kirejczyk, M. Kis, T. Matulewicz, P. Koczon, M. Korolija, R. Kotte, A. A. Lebedev, Y. Leifels, A. Mangiarotti, D. Pelte, M. Petrovici, F. Rami2, W. Reisdorf, M. S. Ryu, A. Schüttauf, Z. Seres, B. Sikora, K. S. Sim, V. Simion, K. Siwek-Wilczynska, V. Smolyankin, G. Stoicea, Z. Tyminski, K. Wisniewski, Z. G. Xiao, H. S. Xu, I. Yushmanov, X. Y. Zhang, A. Zhilin
FOPI Collaboration(s)
(2007)

New results concerning the production of neutral strange particles, K0 and Lambda in Ni+Ni collisions at 1.93A GeV, measured with the FOPI detector at GSI Darmstadt, are presented. Rapidity density distributions and Boltzmann slope parameter distributions are measured in nearly the full phase space of the reaction. The observables are compared to existing K+ and proton data. While the K0 data agree with previously reported K+ measurements, the Lambda distributions show a different behavior relative to that of protons. The strangeness balance and the production yield per participating nucleon as a function of the centrality of the reaction are discussed, for the first time at GSI Schwerionen Synchrotron (SIS) energies.
1 :  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
2 :  DRS-IPHC - Département Recherches Subatomiques
Physique/Physique Nucléaire Expérimentale