Properties of8Be and12C deduced from the folding-potential model

Theα-α differential cross sections are analyzed in the optical model using a double-folded potential. With the knowledge of this potential bound and resonance-state properties ofα-cluster states in8Be and12C as well as astrophysical S-factors of4He(α,γ)8Be and8Be(α,γ)12C are calculated. Γγ-widths and B(E2)-values are deduced.