Correlated Energy Spectra of Light Fragments from 720-MeVα-Induced Reactions

Double-differential cross sections have been measured for protons, deuterons, tritons, ${}_{}{}^3{}_{}{}^{}\mathrm{He}$, and ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ at laboratory angles of 60°, 90°, and 120° from targets of Al, Ag, and Ta bombarded with 720-MeV $\alpha$ particles. At a given angle the high-energy $\frac{d^2\sigma }{d\Omega \mathrm{dE}}$ spectra are very similar in shape, independent of fragment and target. The nuclear fireball and coalescence models are somewhat less consistent with these data than with high-energy heavy-ion data obtained with the Bevalac.