Abstract
A clean separation of compound-nucleus and direct-reaction processes in ($p,\ensuremath{\alpha}$) reaction was made for 12- and 17-MeV protons bombarding on Cd and Sn isotopes. Results indicated the compound-nucleus contributions for $^{112}\mathrm{Sn}$ give isotropic angular distribution for the $\ensuremath{\alpha}$ particles. Shapes of the energy spectra of emitted $\ensuremath{\alpha}$ particles were in good agreement with statistical theory calculation, but absolute cross sections were larger than predicted by a factor of 2 to 7.
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