Correlations and charge distributions of medium heavy nuclei

The effects of long- and short-range correlations on the charge distributio ns of some medium and heavy nuclei are investigated. The long-range correla tions are treated within the random-phase approximation framework and the s hort-range correlations with a model inspired by the correlated basis funct ion theory. The two types of cot-relation produce effects of the same order of magnitude. A comparison with the empirical charge-distribution differen ce between Pb-206 and Tl-205 shows the need to include both correlations to obtain a good description of the data.