Abstract
The semiclassical method is used to analyze various optical potentials. Resonances in an optical potential appear as the interference between the ware reflected from the external barrier and the wave reflected from the interior part of the potential. The interference causes a dip in the amplitude of the total S-matrix and is related to the zero of the S-matrix. Optical potentials are analyzed in this framework. We found that (i) the enhanced backward angle cross section can be interpreted as being due to a single potential resonance only when the absorption is weak, (ii) the Regge pole parametrization studied by McVoy in his surface transparent potential represents the surface transparent property of the potential - it has nothing to do with a potential resonance - and (iii) the anomalous large angle scattering (ALAS) of α- 40Ca is due to the coherent contribution of many partial waves. The method is also useful to analyze the scattering by optical potentials in general.
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