Coupling and higher-order effects in the 12C(d,p)13C and 13C(p,d)12C reactions -: art. no. 014610

Coupled-channel calculations are performed for the C-12(d,p)C-13 and C-13(p,d)C-12 reactions between 7 and 60 MeV to study the effect of inelastic couplings in transfer reactions. The effect of treating transfer beyond Born approximation is also addressed. The coupling to the C-12 2(+) state is found to change the peak cross section by up to 15%. Effects beyond Born approximation lead to a significant renormalization of the cross sections, between 5% and 10% for deuteron energies above 10 MeV and larger than 10% for lower energies. We also performed calculations including the remnant term in the transfer operator, which has a small impact on the C-12(d,p)C-13(g.s.) and C-13(p,d)C-12(g.s.) reactions (where g.s. indicates ground state). Above 30-MeV deuteron energy, the effect of the remnant term is larger than 10% for the C-12(d,p)C-13(1/2(+), 3.09 MeV) reaction and is found to increase with decreasing neutron separation energy for the 3.09-MeV state of C-13. This is of importance for transfer reactions with weakly bound nuclei.