IN-MEDIUM SCALING LAW AND ELECTRON-SCATTERING FROM HIGH-SPIN STATES IN PB-208

The effects of the environment modifications in the structure of the l ow-lying high-spin states of Pb-208 are studied by analyzing how the i n-medium scaling law works on the excitation energies, wave functions, and electron scattering form factors corresponding to these states. I t is shown that the consideration of f(pi) in addition to the effecti ve rho-meson mass does not affect to much most of the states analyzed. However, some of them appear to be extremely sensitive to its inclusi on in the residual nucleon-nucleon interaction. As a result, a value o f m(rho)/m(rho) approximate to f(pi)*/f(pi) approximate to 0.91 gives a good description of the (e, e') form factors of these particular st ates without any quenching factor. This value is in agreement with the one found for Ca-48 in a similar analysis performed in a previous wor k.