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HK: Hadronen und Kerne

HK 59: Heavy Ion Reactions VII, Relativistic Energies

HK 59.6: Talk

Thursday, March 19, 1998, 16:15–16:30, P

Production and Flow of K_s⁰ and Λ in ⁵⁸Ni+⁵⁸Ni Collisions at 1.93 AGeV — •Ralf Kutsche — GSI Darmstadt, Uni Heidelberg, FZ Rossendorf, INPE Bucharest, KFKI Budapest, LPC Clermont-Ferrand, ITEP/KI Moscow, IReS Strasbourg, Korea University Seoul, RBI Zagreb

The production and the directed sideward flow of neutral K_s⁰-mesons and Λ-hyperons has been studied in ⁵⁸Ni+⁵⁸Ni collisions at 1.93 AGeV in an experiment performed at GSI Darmstadt with the detector system FOPI. The incident energy is close to the threshold of strange particle production in free nucleon-nucleon collisions. Therefore the production is sensitive to multiparticle effects and multistep processes, and especially kaons are believed to be good probes of the hot and high-density phase of nuclear matter. The sideward flow of kaons is of particular interest since recent theoretical calculations [1, 2] suggest that the small or vanishing flow of K⁺ in Ni+Ni [3] might be connected to in-medium mass modifications of these particles. K_s⁰ and Λ are identified via an invariant mass analysis of their decay products, (π⁺, π⁻)- and (p, π⁻)-pairs, respectively. We present details about the reconstruction and preliminary results on the sideward flow.

[1] G. Q. Li at al. Nucl. Phys. A594 (1995) 439

[2] E. L. Bratkovskaya et al. Nucl-th 9703047 (1997) app. in Nucl.  Phys. A

[3] J. Ritman et al. Z. Phys. A352, 355 (1995)