Abstract
Excitation functions were measured radiochemically for the $^{48}\mathrm{Ti}$(n,\ensuremath{\alpha}${)}^{45}$Ca and $^{50}\mathrm{Ti}$(n,\ensuremath{\alpha}${)}^{47}$Ca reactions over the neutron energy range of 12.6 to 19.6 MeV. Use was made of low-level anticoincidence ${\mathrm{\ensuremath{\beta}}}^{\mathrm{\ensuremath{-}}}$ counting in the radioactivity measurement of $^{45}\mathrm{Ca}$ and of high-resolution \ensuremath{\gamma}-ray spectroscopy in the case of $^{47}\mathrm{Ca}$. Statistical model calculations taking into account preequilibrium effects described the proton emission well; the calculated $^{4}\mathrm{He}$ emission results were, however, consistently lower than the experimental data, both as regards emission spectrum and excitation function. Inclusion of direct three-nucleon pickup component in the $^{4}\mathrm{He}$ emission calculation improved the agreement between theory and experiment.
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