Abstract
Qualitative arguments are given to show that although first-order distorted-wave Born approximation calculations are adequate for the treatment of single-nucleon transfer reactions, there is little reason to trust them for two-nucleon or multinucleon transfer reactions. A first-plus-second Born approximation calculation is presented for the $^{208}\mathrm{Pb}$($^{16}\mathrm{O}$, $^{18}\mathrm{O}$)$^{206}\mathrm{Pb}$ ground state transition, at bombarding energies below and slightly above the Coulomb barrier. It is found that successive transfer (two-step) processes account for almost all the observed cross section.NUCLEAR REACTIONS Theory of one- and two-step contributions to $^{208}\mathrm{Pb}$($^{16}\mathrm{O}$, $^{18}\mathrm{O}$)$^{206}\mathrm{Pb}$.
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