On the Repulsive Core and the Nonstatic Effects of Nuclear Forces in Momentum Space

Abstract

Nucleon-nucleon scattering due to the exchange of 'lC, (J), P and an isoscalar scalar meson is calculated for spin singlet states in momentum space. We are mainly concerned with the problerri whether or not the (J)-meson exchange can be the origin of the repulsive core by treating the nonstatic effects of heavy mesons as accurately as possible. The ai-nucleon coupling constant obtained in the ISO state by momentum-space calculations can be taken smaller than that obtained from the static coordinate-space potential, but is still· too large to reconcile with small values inferred from the higher partial wave fit. In the framework of the one-boson-exchange model, the non-static effects are attractive and cannot produce the repulsive effects in the ISO state. Comparison with the results ob­ tained from the velocity-dependent potential shows that such attractive nonstatic effects can be simulated by the effect of a p2-dependent term.