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The predictions of the particle-hole model for 28Si are compared with experimental results for large-angle high-momentum-transfer inelastic electron scattering. A few high-spin T=1 states are seen to dominate the cross section. (Author), Also available as Rept. no. ITP-364. Sponsored in part by Grant NSF-GP-9498.

The paper presents experimental data and theoretical results for electroexcitation of T=1 particle-hole states in 016., Also available as Rept. no. ITP-335.

Theoretical and experimental results are given for electron excitation of particle-hole states in Carbon 12. (Author), Also published as Rept. no. ITP-303.

Using the analytic properties of partial wave scattering amplitudes, as derived from Mandelstam's representation, we have studied the J=3/2, P state of the pion-nucleon system. The method used is covariant, it incorporates unitarity, and the effect of a possible pion-pion resonance has been investigated. Using the "single nucleon term" and the low-energy scattering properties of the "crossed states," we obtain a resonance in the J=3/2, T=3/2 pion-nucleon state without the aid of a cutoff. We have also investigated the scattering in the T=1/2 state. The pion-pion resonance appears to have only a very small effect in the T=3/2 state whereas in the T=1/2 state it increases the phase shift by a factor of 2. The resonance obtained in the T=3/2 state occurs at too low an energy. There are several factors which may account for this: We have not been able to include fully the contributions from crossed states, and we have not systematically included inelastic scattering.