Nuclear density dependence of in-medium polarization

It is shown that polarization transfer measurements (e,e'p) on a specific target nucleus can provide constraints on the ratio of the in-medium electric to magnetic form factor. Thereby one exploits the fact that proton knockout from single-particle levels exhibit a specific sensitivity to the effective nuclear density. It is shown that in 12C the effective nuclear density for s-shell knockout is about twice as high as for p-shell knockout. With current model predictions for the in-medium form factors, one obtains measurable modifications of the order of 5% in the ratios of the double polarization observables between those single-particle levels