Several models of light fragment emission are confronted with data from electron and proton induced reactions. The data appear to favor a mechanism, called the snowball model here, in which there is a single collision of the projectile and a few collisions of the secondary nucleons which then form the observed fragment. The parameter of the model is determined by fitting new isotopically separated inclusive differential cross section data.

NUCLEAR REACTIONS Statistical, knockout, and coalescence models, light fragment emission, electron and proton induced reactions.

• Received 25 March 1981

DOI:https://doi.org/10.1103/PhysRevC.23.2788