Alpha-Particle Emission in Deeply Inelastic Reactions of 204-MeVO16+Nb93

Angular and energy correlations have been measured for $\alpha$ particles emitted in coincidence with projectilelike fragments from deeply inelastic collisions of 204-MeV ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ with ${}_{}{}^{93}{}_{}{}^{}\mathrm{Nb}$. Anisotropic emission of fast $\alpha$ particles is observed; however, the main results of this and similar experiments can be reproduced by model calculations which assume the $\alpha$ particles are evaporated from fully accelerated fragments and take the angular distribution of projectilelike fragments into account.