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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 41: Heavy Ions IV

HK 41.3: Group Report

Thursday, March 11, 2004, 14:30–15:00, E

Strange particles measured with FOPI — •Markus Merschmeyer — Physikalisches Institut der Universität Heidelberg, 69120 Heidelberg, Germany

Strangeness production in heavy-ion collisions at intermediate energies (1-2 AGeV) is believed to provide an insight into equilibration and the change of hadron properties in a hot and dense nuclear medium. The FOPI detector at SIS allows the indentification of K± and, futhermore, the reconstruction of K0, Λ0 and φ by their charged decay products. In January 2003 a high-statistics experiment (Ni+Ni, 1.93 AGeV) was performed which aimed primarily at the understanding of (multi-) strange particle production. About 105 Λ0 can be reconstructed from the collected data and allow sensitive tests of theoretical concepts. The talk gives an overview of FOPI’s recent results on strangeness production in the Ni+Ni system at 1.93 AGeV. In particular, complete phase-space distributions of K0 and Λ0 are presented and strangeness balance is discussed in the light of a surprisingly high Λ0 yield. Limits on the production of short-lived strange resonances (Ξ, Σ(1385)) are given.
supported by BMBF (06HD154) and GSI (HD-PEL)

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