Abstract
The neutron energy spectra and angular distributions have been measured for thick targets of $^{9}\mathrm{Be}$, $^{181}\mathrm{Ta}$, and $^{197}\mathrm{Au}$ bombarded by 40--60 MeV alpha particles. These data as well as those of other authors have been analyzed in terms of the extended exciton model formalism of nuclear reactions. The model takes into account the emission of neutrons through the single-step direct, multistep direct, multistep compound, and compound-nuclear evaporation processes.
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