HIGH-SPIN STATES OF JPI = 12-, 14- IN PB-208 STUDIED BY (E,E')

Inelastic electron scattering cross sections for the excited states at 6.43, 6.74, and 7.06 MeV in Pb208 were measured with high resolution. The measurements were done in forward and backward directions covering the momentum transfer range of 0.3<q<2.5 fm-1. The state at 7.06 MeV was identified as the (i132h112-1)12- and the states at 6.74 and 6.43 MeV as the (j152i132-1)14-,12-, respectively. The identification was based on four criteria: (a) the agreement between the q dependence of the measured form factor with that of Hartree-Fock single particle-hole prediction, with no adjustment of radial parameters, (b) the absence of a longitudinal form factor, (c) the relative magnitude of the observed levels, and (d) the excitation energies being close to the single p-h energies. The measured strength of each state was found to be 50% of the single p-h prediction. NUCLEAR REACTIONS Pb208(e,e) E=50-335 MeV; measured (E), =90°,160°. Pb208 deduced, levels J=12-, 14-. DWBA calculation with Hartree-Fock single particle wave functions. © 1979 The American Physical Society.