Collective models in excited nuclei and excited baryons

The author reviews the single-particle shell model of nuclei pointing out some of its successes and failures. Collective models are then introduced as a way to overcome the inadequacies of the shall model. Specifically, the geometric interpretation is compared to the group theoretical approach and resulting spectra are found to agree. The shell model is then applied to nucleons and problems are shown to occur. A collective model is subsequently suggested as a means to study excited baryon spectra. The phenomenon of parity doubling is discussed as a natural consequence of the model. The effect is observed in N* and Δ* spectra with the expected behavior of states with large angular momentum. 12 refs., 19 figs