Exchange effects in nucleus-nucleus reactions

We present a scattering model for nuclei with similar masses. In this three-body model, the projectile has core+valence structure, whereas target is identical to core nucleus. The wave functions must be symmetrized exchange of cores. This property gives rise non-local potentials, which are computed without approximation. an extension Continuum Discretized Coupled Channel (CDCC) formalism, additional treatment exchange. solve coupled-channel system, including terms, by $R$-matrix method using Lagrange functions. applied $^{13}{\rm C}+^{12}$C, N}+^{12}$C and $^{16}{\rm O}+^{12}$C systems. Experimental cross sections fairly well reproduced any parameter fitting. backward-angle enhancement elastic due potential. discuss in more detail various contributions effective local potentials.