The Jülich hyperon-nucleon interaction models

Abstract

Hyperon-nucleon interaction models ( A, B), which have been developed in the meson-exchange framework by the Juelich group, are reviewed, with some emphasis on characteristic conceptual differences compared to corresponding interactions constructed by the Nijmegen group. We report on two new versions A ̄ and B ̄ in which the explicit energy-dependence of the original models A, B is removed in order to simplify application in nuclear structure calculations. As a byproduct of our analysis we find that the resulting SU(3) parameters like F/F+D ratios do depend on the specific model used and on approximations applied. While all models provide a reasonable description of the cross-section data, sizeable differences occur in spin observables, especially between our models and the Nijmegen soft-core model NSC. This demonstrates clearly that a measurement of such observables can easily discriminate between present models and thus shed some light on various aspects of the hyperon-nucleon interactions like e.g. the proper choice of parameter constraints.