Deuteron elastic scattering and stripping processes off 12C as a three-body problem

Deuteron elastic scattering and stripping processes off a target nucleus consisting of A nucleons are treated within the framework of the few-body integral equations theory. By projecting the (A+2)-body operators onto target states, matrix three-body integral equations are derived that allow for the incorporation of the excited states of the target nucleons. This approach is applied to deuteron scattering off C-12 when the latter is in its ground state before and after the reaction. For the nucleon-C-12 subsystem three sets of (quasi-separable) potentials are employed. The first such potential is based on the one derived by Cattapan [Nucl. Phys. A241, 204 (1975)] for orbital angular momentum states with L <= 2, which is valid for low energies. As second set we use the potential of Miyagawa and Koike [Prog. Theor. Phys. 82, 329 (1989)] fitted to semiphenomenological higher-energy phase shifts for states up to L=6. The third one finally consists for 3 <= L <= 5 of the potential set of Miyagawa and Koike, whereas the potential parameters for L <= 2 are determined by simultaneously fitting the elastic-channel T matrix obtained as solution of multichannel two-body Lippmann-Schwinger equations, to the experimental low-energy and the semiphenomenological higher-energy phase shifts. For the nucleon-nucleon interaction we take one of the separable S-3(1)-D-3(1) potentials of Phillips [Nucl. Phys. A107, 207 (1968)]. Differential cross sections for the elastic-scattering reaction d+C-12 -> d+C-12 and the transfer reaction d+C-12 -> p+C-13(C-13(*)) are calculated at deuteron bombarding energies of 4.66 and 15 MeV (up to 36-channel calculation), and at 56 MeV (up to 76-channel calculation) together with some selected analyzing powers, and are compared with experimental data. At the highest energy considered, the decomposition of the differential cross section into the near-side and the far-side components shows the appearance of nuclear rainbow scattering.