The excitation functions of twenty nuclear reactions induced by protons of up to 85 MeV incident upon 48Ti and S~ targets have been measured. Most of these involve the emission of one to three alpha particles. The Exciton model has been used to calculate these excitation functions. An expanded and more precise treatment of nucleon-alpha scattering has been incorporated into the model. It is presented and the implications of its predictions discussed. The agreement of experiment and calculation is very good lending support to the approach to alpha particle interactions introduced in this work.Nuclear Reactions: 48Ti(p, xnypzcO, S~ xnypze), x =0-7, y=2-6, z=0-3; measured a(E). Calculated a(E). 48Ti, 5~ enriched targets.

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