Coupling and higher - order effects in the 12 C ( d , p ) 13 C and 13 C ( p , d ) 12 C reactions
نویسندگان
چکیده
Coupled-channel calculations are performed for the 12C(d,p)13C and 13C(p,d)12C 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 12C 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 12C(d,p)13C(g.s.) and 13C(p,d)12C(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 12C(d,p)13C(1/2+, 3.09 MeV) reaction and is found to increase with decreasing neutron separation energy for the 3.09-MeV state of 13C. This is of importance for transfer reactions with weakly bound nuclei.
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