Isoscalar breathing-mode state in /sup 144/Sm and /sup 208/Pb

Elastic ..cap alpha..-scattering experiments have been performed on /sup 144/Sm and /sup 208/Pb at E/sub b/MeV over the angular range 3/sup 0/ < or = theta/sub L/ < or = 8/sup 0/. It is apparent that the isoscalar giant resonance in these nuclei consists of at least two broad components. The angular distribution for one component (/sup 144/SmEx approx. 12.4 MeV, /sup 208/PbE/sub x/ approx. 11.0 MeV) is well described as E2, while that for other component (/sup 144/SmE/sub x/ approx. 15.1 MeV, /sup 208/PbE/sub x/ approx. 13.7 MeV) is well described by an E0 excitation exhausting approximately 100% of the E0 energy-weighted sum rule.