Fusion ofO16+Sm148,150,152,154at sub-barrier energies

Measurements of the cross section for fusion of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ with ${}_{}{}^{148,150,152,154}{}_{}{}^{}\mathrm{Sm}$ have been made in the range $60\le E_{{}_{}{}^{16}{}_{}{}^{}\mathrm{O}}\le 75$ MeV. Evaporation residues trapped in a carbon catcher foil were observed off line by means of the $K$ x rays emitted by radioactive Yb nuclei and their daughters. Absolute cross sections varying in magnitude from 0.1 to 400 mb were determined with an uncertainty of ±10%. The cross sections for individual $x-n$ channels were also determined. At high energies, the fusion cross sections for all isotopes are similar, whereas at lower bombarding energies the cross sections for the more deformed targets are larger than those for the spherical targets.