HIGH-MOMENTUM PROTONS IN PB-208

High-momentum components of proton momentum distributions in Pb-208 ha ve been studied from 300 to 500 MeV/c with the (e, e' p) reaction. Cro ss sections were measured with 180 keV excitation-energy resolution fo r transitions to the low-lying 1/2(+), 3/2(+), 11/2(-), 5/2(+), and 7/ 2(+) states in Tl-207. The data are compared to distorted-wave impulse -approximation calculations with mean-field wave functions and with wa ve functions that include nucleon-nucleon correlations. The data are s ubstantially larger than mean-field predictions. The observed excess s trength at low excitation energy appears to be mainly due to long-rang e correlations and not to short-range and tenser correlations.