Energy spectra and angular distributions of projectile-like fragments, ranging from ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$ to ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$, have been measured for the 120 MeV ${}_{}{}^{19}{}_{}{}^{}$F${+}^{64}$Ni reaction. Experimental evidence is given for the presence of two dissipative components attributed, on the basis of optimum Q values, to incomplete fusion and deep-inelastic collision mechanisms. Measured Q-value spectra show the dominance of the incomplete fusion mechanism in N and O isotopes production, while deep-inelastic collisions increase with the charge transfer. Furthermore, angular distributions and optimum Q values display larger relative contributions of incomplete fusion with respect to deep inelastic collisions for heavier isotopes of each Z. An incomplete fusion model reproduces the cross sections for most of the channels where this mechanism is prevalent. An attempt to include deep inelastic mechanisms in the same model is presented.

• Received 6 March 1989

DOI:https://doi.org/10.1103/PhysRevC.40.742