Charged-particle emission in reactions ofZr90with 10-86-MeV protons

Excitation functions for 12 nuclear reactions of type ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}\mathrm{}\left[\right(p,(2-4\mathrm{})p,\mathrm{}(1-6)n]$ have been measured for incident proton energies from 10-86 MeV. The complex excitation functions have been decomposed to yield a component due to emission of one or two $\alpha$ particles, and a component due to the emission of individual nucleons. Combining the $\alpha$ particle portions of the decomposed excitation functions, the excitation energy spectra for those events associated with $\alpha$ particle emission have been derived. Having estimated the excitation functions for a few missing reactions, the total probability of emission of seven combinations of charged particles as a function of incident proton energy has been calculated. The implications of the results on the preequilibrium model of nuclear reactions are discussed.