Abstract

We explore the role of coupling to $\ensuremath{\Delta}$ isobars (in both the $N\ensuremath{\Delta}$ and $\ensuremath{\Delta}\ensuremath{\Delta}$ channels) in medium modifications of the effective $\mathrm{NN}$ interaction that drives 200-MeV proton inelastic scattering. A comparison of the predictions to natural-parity ${(p,p}^{\ensuremath{'}})$ cross section and analyzing power data show that isobar degrees of freedom in the medium generate overly repulsive effective interactions. Furthermore, this model extension is unable to resolve difficulties observed earlier describing polarization transfer measurements in some high-spin, unnatural-parity ${(p,p}^{\ensuremath{'}})$ transitions.

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