Mass systematics of evaporation residues fromCl35- andS32-induced fusion on light targets

Evaporation residues of reactions between ${}_{}{}^{24,25,26,}{}_{}{}^{}\mathrm{Mg}$, ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$, and ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ as targets and 100-170 MeV ${}_{}{}^{35}{}_{}{}^{}\mathrm{Cl}$ and 130 MeV ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}$ beams and also between ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ and 117.5 MeV ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ ions were measured at small forward angles using a time-of-flight telescope. The mass distributions of the products show a complex structure, which is shown to vary smoothly with beam energy and target mass. A dominant decay mode of the compound nucleus can be assigned to each residue mass using the shape of the angular distribution. An evaporation model calculation predicts qualitatively the main features of the mass distributions.