Evidence for a nonequilibrated dinuclear system in dissipative collisions at 19 MeV/nucleon

Exclusive measurements of two- and three-body events were performed for the system ${}_{}{}^{120}{}_{}{}^{}\mathrm{Sn}$ ${+}^{100}$Mo at 19.1 MeV/nucleon. Most ternary events are consistent with sequential processes in which one of the two deep-inelastic fragments fissions. For such events large differences are found between the fission probabilities of projectilelike and targetlike fragments of a given mass, this probability being larger for the nucleus which gained nucleons. This behavior demonstrates that there is a lack of equilibrium at the end of the deep-inelastic collision.