Aspects of alpha-particle scattering and structure of the nuclear surface

The interaction of alpha particles above 5 MeV with a 2s-1d target is dominated fly resonances. It cannot be described only in terms of a mean-field one-body potential. An analysis of the elastic alpha-particle scattering by Si-28 encourages the comprehension of the resonance states to be mainly fragments of a mixed-parity band. In the present article, the angular distributions of particles scattered by S-32 are analyzed in terms of such bands. The analysis of new data from an experiment made at Florida State University reveals the existence of states that do not belong to the above bands. This follows from a coupled-channel analysis of the elastic and inelastic (2(+)) cross sections. An alpha-particle structure at the nuclear surface is suggested. (C) 2002 MAIK "Nauka/Interperiodica".