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A microscopic version of the Continuum Discretized Coupled Channel (CDCC)method is used to investigate $^{6}$He scattering on $^{27}$Al, $^{58}$Ni,$^{120}$Sn, and $^{208}$Pb at energies around the Coulomb barrier. The $^{6}$Henucleus is described by an antisymmetric 6-nucleon wave function, defined inthe Resonating Group Method. The $^{6}$He continuum is simulated bysquare-integrable positive-energy states. The model is based only on well knownnucleon-target potentials, and is therefore does not depend on any adjustableparameter. I show that experimental elastic cross sections are fairly wellreproduced. The calculation suggests that breakup effects increase for hightarget masses. For a light system such as $^{6}$He+$^{27}$Al, breakup effectsare small, and a single-channel approximation provides fair results. Thisproperty is explained by a very simple model, based on the sharp-cut-offapproximation for the scattering matrix. I also investigate the $^{6}$He-targetoptical potentials, which confirm that breakup channels are more and moreimportant when the mass increases. At large distances, polarization effectsincrease the Coulomb barrier, and provide a long-tail absorption component inthe imaginary part of the nucleus-nucleus interaction.

Low-energy $^{6}$He scattering in a microscopic model