The ''Other'' Giant Dipole Resonance: Evidence For The Isoscalar Giant Dipole Resonance In Pb-208 From Inelastic Alpha Scattering At 0 Degrees

The isoscalar giant dipole resonance (ISGDR) in Pb-208 has been investigated using inelastic scattering of 200 MeV alpha particles at and near 0 degrees where the angular distribution of the ISGDR can be clearly differentiated from other modes. The ''difference of spectra'' technique was employed to separate the contribution from the high-energy octupole resonance (HEOR). Preliminary angular distribution data provide clear evidence for the ISGDR adjacent to the HEOR.