PROTON-SCATTERING BY PB-206,PB-207,PB-208 AT 650 MEV - PHENOMENOLOGICAL ANALYSIS

Elastic and inelastic differential cross sections and analyzing powers are presented for the scattering of 650 MeV protons from Pb-206,Pb-20 7,Pb-208. Five phenomenological optical potential sets with comparable chi(2) values are obtained. The volume integrals and root-mean-square (rms) radii of these potential sets are compared with those expected from the impulse approximation. The agreement is close for the imagina ry, but not the real central potentials. The potential rms radii are s imilar to 3% smaller than those from the impulse approximation indicat ing a ''shrinking'' of the effective nuclear density. The inelastic da ta for (206,208Pb) are analyzed using collective transition densities. The results are then compared with electromagnetic matrix elements to obtain neutron-proton transition matrix element ratios. These are in fairly good agreement with earlier determinations and indicate large c ore polarization contributions to the low-lying ''two neutron hole'' s tates in Pb-206.