Momentum distributions of projectilelike fragments produced in the interaction of 15, 25, and 35 MeV/nucleon ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ beams on targets of ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$, ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$, ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ti}$, and ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ have been measured. Widths and centroids of the quasielastic component of the distributions have been extracted for fragments ranging from ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ to ${}_{}{}^{13}{}_{}{}^{}\mathrm{N}$. The widths are compared with published data and several theoretical predictions. The Friedman model correctly predicts the charge and isotope dependence of the widths at the highest beam energy. At 15 MeV/nucleon some deviations from the trend of the published data suggest the possibility of a different reaction mechanism for the projectile-target combinations studied in the present work.

• Received 11 August 1986

DOI:https://doi.org/10.1103/PhysRevC.35.614