Various sub-barrier capture reactions with beams 16,18O and 40,48Ca
are treated within the quantum diffusion approach. The role of neutron transfer
in these capture reactions is discussed. The quasielastic and capture barrier
distributions are analyzed and compared with the recent experimental data.Comment: 8 pages, 9 figures, will be published in EPJA. arXiv admin note:
substantial text overlap with arXiv:1211.433