Width of the Δ resonance in nuclei

In this work the authors evaluate the imaginary part of the isobar Δ self-energy ΣΔ from the two-body absorption process Δ+N→2N. This contribution is calculated using a recently developed non-relativistic scheme, which allows for an evaluation of the self-energy with a basis of single-particle states appropriate for both bound hole states and for particle states in the continuum. In order to test the medium dependence of the self-energy, the two-body absorption term ΣA2Δ for several finite nuclei with N=Z is calculated, i.e. 16O, 40Ca and 100Sn. The resulting self-energy, which is energy dependent and non-local, is compared with a simple parametrization derived from nuclear matter. 12 refs., 3 figs