Giant resonance structure inPb208measured using the (p,p’) reaction at 334 MeV

The structure of giant resonances in ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ has been studied using inelastic scattering of 334-MeV polarized protons. Data were obtained with 70-keV energy resolution over an angular range from 2–13 deg and the spectra were measured over an excitation energy range from 0–25 MeV. The results show that the quadrupole resonance strength is divided into two main components, one centered at 10.6 MeV containing 70% of the energy-weighted sum rule in a 2-MeV wide peak and a second component composed of several discrete peaks located between 7 and 9 MeV which deplete a total of approximately 20% of the energy-weighted sum rule. The giant monopole and dipole resonances as well as a hexadecapole resonance are observed. Measurements of differential cross sections for elastic scattering and inelastic scattering to low-lying $3^{\mathrm{-}}$, $2^{+}$, and $4^{+}$ levels are presented. Comparison of these data with collective model direct reaction calculations shows the calculations to correctly describe the shape and magnitude of the cross sections when normalized to the known transition rates for each level.