Evidence for the Isoscalar Giant Dipole Ressonance in ^{208}Pb Using Inelastisc Scattering at and near 0^{0}

The isoscalar giant dipole resonance (ISGDR) in ${}^{208}\\mathrm{Pb}$ has been investigated using inelastic scattering of 200 MeV $\\ensuremath{\\alpha}$ particles at and near 0\\ifmmode^\\circ\\else\\textdegree\\fi{} where the angular distribution of the ISGDR can be clearly differentiated from those of other modes. The ``difference of spectra'' technique was employed to separate the ISGDR from the high-energy octupole resonance (HEOR). These data provide the clearest evidence yet for the ISGDR adjacent to the HEOR. With these results, all expected isoscalar $\\ensuremath{\\lambda}\\ensuremath{\\le}3$ resonances in ${}^{208}\\mathrm{Pb}$ have been identified.