Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 41: Heavy Ions IV
HK 41.3: Gruppenbericht
Donnerstag, 11. März 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)