Reaction mechanism for (p,t) and ((p,He3) reactions on C13

Differential cross sections and analyzing powers of the C13(p,t)C11 and C13(p,He3)B11 reactions to the ground and the first excited states were measured at Ep=65 MeV. They were analyzed by means of distorted-wave Born approximation calculations including both one- and two-step processes of p-d-t or -He3. Attention was paid to an isospin symmetry of the reaction process consisting of both isospin 0 and 1 channels, which were important in a comparable order. As intermediate states of C12 in the sequential process, five states of either isospin 0 or 1, which were strongly excited by the C13(p,d)C12 reaction, were taken into account. A good fit between the data and the theoretical values was obtained, especially for the (p,t) reactions, concerning both differential cross sections and analyzing powers. The calculations including one-step and sequential processes induced, in some cases, remarkable differences from the one-step calculation for backward angles. NUCLEAR REACTIONS C13(p,t)C11, C13(p,He3)B11, E=65 MeV; measured () and analyzing powers for 4 transitions. One-step and sequential processes DWBA analysis.