Abstract
The elastic and inelastic scattering of 6O+28Si at ECM=35 MeV (over the angular range 20 degrees < theta <180 degrees ) has been analysed by the method of the parametrised smooth cut-off S matrix (S(l)) and the derivative relation of Austern and Blair for the single-phonon excitation mechanism. The dominant pole of S(l) (the nearest to the real axis) is allocated to the rainbow scattering region of the complex l plane. Agreement between theoretical and experimental results for the nuclear rainbow angle is obtained. These results indicate that the backward oscillation observed in the elastic scattering angular distribution cannot be identified with the glory effect or orbiting (spiral) phenomena. The reduced matrix element and deformation length are determined for the 2+, 1.78 MeV state in 28Si.