Abstract
It is suggested that the deviations from pure Hauser-Feshbach predictions found in the already published analysis of /sup 12/C(/sup 16/O,..cap alpha..) data might be due to neglect of important multistep compound contributions. An appropriate multiclass fluctuation analysis clearly indicates the presence of two correlation widths, which can be associated with the population of two classes of overlapping states: one made up of doorway states, revealed by the largest of the observed coherence widths, and another made up of compound nucleus states connected with the fine structure of the fluctuating excitation functions. This interpretation was reinforced by new measurements on both excitation functions and complete ..cap alpha.. spectra. In addition, comparison of these data with calculations based on the quantum statistical multistep compound theory confirmed the importance of precompound effects and shed light on the nature of such doorway states which were found to be made up of 5p-1h configurations. These results support the hypothesis of Voit et al. that the first interaction between such light heavy-ion systems is dominated by the formation of ..cap alpha..-particle doorway states.
Published Version
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