Münster 2002 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 37: Theory V
HK 37.1: Group Report
Thursday, March 14, 2002, 14:00–14:30, A
Dynamical Correlations in In-Medium Hyperon and Nucleon Interactions — •Ch. Keil, H. Lenske, and C. Greiner — Institut für Theoretische Physik, Universität Gießen, Germany
The extension of isospin nuclear structure physics into the full SU(3)f flavor sector is investigated in a field-theoretical approach using Dirac-Brueckner theory and the DDRH field theory for finite nuclei. Baryon-baryon interactions in free space and hadronic matter are calculated in a SU(3)f scheme by solving the K-Matrix equations for the lowest meson nonets and baryon octets. Results for BB interactions in infinite hadronic matter are presented. The structure of correlated two-baryon wave functions in nuclear matter is discussed and applications in HBT-analyses of hyperon production in heavy ion collisions are indicated. DDRH theory is used to extract density dependent meson-baryon vertices, allowing applications to finite nuclei in a covariant and thermodynamically consistent approach. RMF calculations for single Λ hypernuclei are in good agreement with observed hyperon separation energies and spin-orbit splittings. The ΛΛ correlation energy, however, derived experimentally from recent measurements of ΛΛ6He is underestimated, indicating that correlation dynamics are likely to play an important role for in-medium hyperon interactions. Taking into account loop diagrams extensions of the theory beyond the ladder-approximation are envisaged. As a first application we determine from a re-analysis of the Urbana nuclear equation of state the content of RPA loop diagrams. They are found to introduce a density dependence, shifting the equilibrium point to the empirical position.
Work supported by BMBF.