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 ²⁰⁸Pb(¹⁶O, ¹⁸O)²⁰⁶Pb 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 ²⁰⁸Pb(¹⁶O, ¹⁸O)²⁰⁶Pb.
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Bayman et al. (1982) studied this question.
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