We present the energies, widths, and cross sections of the isovector monopole resonance in nuclei between ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ excited by the (${\pi }^{\pm }$, ${\pi }^0$) reactions. We also give results for the giant dipole resonance. Both resonances exhaust the same substantial fraction of the cross section calculated in a random-phase, distorted-wave impulse-approximation model. No isovector quadrupole resonance was observed.

• Received 13 February 1984

DOI:https://doi.org/10.1103/PhysRevLett.52.2134