Abstract
Excitation functions were measured radiochemically for the Ti-48(n,alpha)Ca-45 and Ti-50(n,alpha)Ca-47 reactions over the neutron energy range of 12.6 to 19.6 MeV. Use was made of low-level anticoincidence beta- counting in the radioactivity measurement of Ca-45 and of high-resolution gamma-ray spectroscopy in the case of Ca-47. Statistical model calculations taking into account preequilibrium effects described the proton emission well; the calculated He-4 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 He-4 emission calculation improved the agreement between theory and experiment.