OBSERVATION OF THE NUCLEAR ISOVECTOR MONOPOLE RESONANCE

Observation of the T+1 component of the isovector monopole and the giant dipole resonances in the reactions /sup 90/Zr and /sup 120/Sn(..pi../sup -/,..pi../sup 0/) at T- = 165 MeV is reported. The isobaric analog state and T-1 component of the giant dipole resonance in the reaction /sup 120/Sn(..pi../sup +/,..pi../sup 0/) were also observed. Excitation energies and widths of the monopole are given.