The relationship between the quasielastic excitation function and the capture
cross section is derived. The quasielastic data is shown to be a useful tool to
extract the capture cross sections and the angular momenta of the captured
systems for the reactions 16O+144,154Sm,208Pb,
20Ne+208Pb, and 32S+90,96Zr at near and above the Coulomb
barrier energies.Comment: 9 pages, 9 figures, will be published in PR