Inelastic alpha scattering to the giant quadrupole and monopole resonances of /sup 58/Ni, /sup 92/Mo, and /sup 120/Sn at 152 MeV

The isoscalar giant resonance region has been investigated in /sup 58/Ni, /sup 92/Mo, and /sup 120/Sn nuclei by inelastic scattering of /sup 4/He particles at small angles where the quadrupole and monopole states can be distinguished through their angular distributions. A monopole resonance is observed in the three nuclei, exhausting, respectively, 23%, 85%, and 110% of the E0 energy weighted sum rule.