Probing reaction dynamics in

Elastic scattering of 12C and 13C projectiles on a 119Sn target was investigated at ELab = 46.9 MeV, corresponding to energies slightly above the Coulomb barrier. The measurements were performed at the Open Laboratory of Nuclear Physics and Applications (LAFNA), University of São Paulo, using the STAR silicon detection array. Angular distributions were analyzed within the optical model and coupled-reaction-channels frameworks, adopting the São Paulo potential as the real bare interaction. For both systems, the inclusion of inelastic and one-nucleon transfer couplings in the coupled-reaction-channels calculations provided a consistent description of the data. Comparison between the 12C and 13C systems revealed clear isotopic effects, indicating that the valence neutron in 13C enhances absorption from the elastic channel into non-elastic processes. These results contribute to a deeper understanding of coupling effects and nuclear structure influences in near-barrier heavy-ion reactions.