Competing reaction mechanisms for the O 1 6 , 1 7 , 1 8 + 1 0 , 1 1 B and F 19 + 9 Be systems

Fusion, strongly damped, quasielastic and elastic scattering yields have been measured for the $^{16,17,18}\mathrm{O}$${+}^{10,11}$B systems at 1 MeV\ensuremath{\le}E/A\ensuremath{\le}4 MeV and $^{19}\mathrm{F}$${+}^{9}$Be at 56 MeV. The significant yields observed for the strongly energy-damped products are attributed to a fusion-fission process. This identification is supported by statistical model calculations based on the transition-state model of fission. The elastic scattering data present enhanced back-angle yields which can be understood in terms of a compound elastic process. These results help to further establish the reaction systematics in this mass region.