Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 49: Nuclear Structure and Dynamics II

HK 49.6: Talk

Wednesday, March 18, 2009, 15:30–15:45, H-ZO 50

Lambda-Sigma Mixing in Nuclear Matter — •Christoph Valentin, Andreas Fedoseew, Patrick Konrad, and Horst Lenske — Institut für Theoretische Physik, Universität Giessen, Germany

We study the mixing of Lambda and Sigma baryons in asymmetric nuclear matter. Starting with a relativistic energy-density functional Lambda-Sigma-Mixing occurs as a many-body effect in isospin asymmetric systems generated by a non-diagonal self-energy in the medium. We describe our system in a density dependent relativistic hadron (DDRH) field theory with microscopically derived meson exchange interactions. For the hyperons we use coupling constants derived from NN-interactions by a scaling law. Our aim is to get a better understanding of the behavior of hyperons in asymmetric nuclear matter, neutron stars and finite nuclei. As an interesting result we find that the mixing is strongly enhanced with increasing asymmetry.