Study of charged particles emitted fromTe117compound nuclei. II. Comparison betweenAr40+Se77andN14+Rh103reactions and determination of critical angular momenta

The compound nucleus ${}_{}{}^{117}{}_{}{}^{}\mathrm{Te}$ was formed with ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ + ${}_{}{}^{103}{}_{}{}^{}\mathrm{Rh}$ at 71- and 107-MeV excitation energies. The deexcitation by protons, deuterons, tritons, and $\alpha$ particles was studied and compared to the deexcitation of the same compound nucleus ${}_{}{}^{117}{}_{}{}^{}\mathrm{Te}$ issued from ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$ + ${}_{}{}^{77}{}_{}{}^{}\mathrm{Se}$ at the same excitation energies. The influence of angular momentum on the evaporation mechanism (angular distributions and cross sections of charged particles) have allowed to determine different values of critical angular momenta limiting compound-nucleus formation. These values are discussed with respect to different models.