Decay via proton emission of isobaric analog states (IASs) in $^{91}{Nb}$ was studied using the $^{90}{Zr}(alpha,t)$ reaction at $E_alpha$=180 MeV. This study provides information about the damping mechanism of these states. Decay to the ground state and low-lying phonon states in $^{90}{Zr}$ was observed. The experimental data are compared with theoretical predictions wherein the IAS `single-particle proton escape widths are calculated in a continuum RPA approach. The branching ratios for decay to the phonon states are explained using a simple model.
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