The Short Range Part of the Nucleon-Nucleon Interaction and the Quark Model

Abstract

The resonating group method is used to calculate in the six quark model the 3S and 1S phase shifts of the nucleon-nucleon interaction. For large distances the model is supplemented by π, σ, ρ and ω-meson exchange. The role of the orbital [42]r symmetry for the short range repulsion is studied. It is shown that at short distances the orbital [42]r symmetry plays an important role which is even enlarged by the colour magnetic interaction. The [42]r symmetry enforces the short range repulsion by a node which it requests at short distances. The mechanism is complicated by the fact, that the orbital [6]r symmetry is admixed by about the same weight. We show that for meson exchanges which mediate the long range behaviour we can now use the SU3 flavour ratios of the meson-nucleon coupling constants even for the ω-nucleon coupling. For the ω-meson one had to use in the OBEP’s a ω-N coupling constant twice to three times as large as predicted by SU3 flavour to describe the short range repulsion. We also comment on the different contributions to this conference about the quark-model and the NN interaction.