Abstract
The energy spectra of α-particles from the (n, α) reactions on 141Pr, 165Ho, 175Lu, 181Ta and 197Au induced by 14 MeV neutrons at 0° have been measured with a n-type silicon surface barrier semiconductor. They cannot be accounted for by the statistical model, with the inclusion of the shell effect for the level density, which is derived from the free gas model for a two-fermion system. The angular distribution of α-particles from 141Pr is strongly forward-peaked. It seems that there is an appreciable contribution of direct processes to these reactions.
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