Abstract
The imaginary central and spin-orbit components of the $\ensuremath{\Delta}$-nucleus optical potential are investigated in a $\ensuremath{\pi}$-exchange model. It is found that the effective spin-orbit interaction of the isobar reflects large nonlocalities from true pion absorption and from the quasielastic $\ensuremath{\Delta}$-decay. The parameters for the absorption and the spin-orbit strength are in qualitative agreement with recent phenomenological results.NUCLEAR SCATTERING $\ensuremath{\Delta}$ isobar propagation; relation of nonlocality and spin-orbit interaction.
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