Elastic and Inelastic Scattering of Polarized Protons from sup 206 Pb Near Isobaric Analog Resonances

摘要

Excitation functions have been measured for the elastic and inelastic scattering of polarized proton from sup 206 Pb at theta/sub lab/ = 120 deg, 135 deg, 150 deg, and 165 deg in the energy range E/sub p/ = 14.25 to 18.00 MeV. Excellent fits to the elastic scattering data were obtained using a parametrized background and the isobaric analog resonances (IAR's) of 35 states in sup 207 Pb (the parent states) with E/sub x/ = 2.3 to 5.7 MeV; spin-parity assignments and resonance parameters were determined for all of these IAR's. The data for inelastic scattering to the first excited state (2 exp + , 0.803 MeV) were described using a DWBA background and the same IAR's; good fits to the data were obtained by varying only the inelastic partial width amplitudes. A set of spectroscopic amplitudes was then found, for both the single-particle and the particle-core components of the parent states, by comparing the best-fit resonance parameters with those given by model calculations. The internal consistency of this set was verified by using sum rules. The spectroscopic amplitudes are compared with those given by simple weak-coupling model predictions; there is considerable disagreement, probably because too few configurations were used in the theoretical calculations. (ERA citation 08:034834)