In-medium Λ interactions and hypernuclear structure

We study the interactions of the octet baryons in a relativistic meson exchange approach connecting freespace and in-medium interactions with those in finite (hyper)nuclei. Our approach is based on the covariant meson exchange framework. To generate the effective microscopic interaction in finite nuclei an approach using Tmatrix theory with a three dimensionally reduced twonucleon propagator is applied. In this way the same mesons with the same bare couplings are used throughout the model. The in-medium interaction is calculated in Dirac-Brueckner theory, i.e. a T-matrix calculation in infinite matter where the intermediate two-baryon propagators are Pauli-blocked and dressed by Hartree-Fock selfenergies. Since a G-matrix calculation for finite nuclei is technically not feasible the density dependent relativistic hadron field theory (DDRH) is used to apply the G-matrix interactions in calculations of finite nuclei [1, 2].