Size and shape of the nuclear density distributions of20Ne and28Si from 104 MeV alpha particle scattering

Measured differential cross sections for the scattering of 104 MeV α particles from20Ne and28Si are analyzed on the basis of a deformed folding model. Rms-radii and values of the deformation parameters for the nuclear density distributions are extracted, and the effect of the size of the α particle is demonstrated. Previous discrepancies between (p,p′) and (α, α′) results are partly removed.