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We investigate the influence of the neutron halo and the breakup channel on the total 6 He+ 238 U fusion cross section at near-barrier energies. To include static effects of the 2n-halo in 6 He nuclei, we use a single-folding potential obtained from an appropriate nucleon-238 U interaction and a realistic 6 He density. Dynamical effects arising from the breakup process are then included through coupled-channel calculations. These calculations suggest that static effects dominate the cross section at energies above the Coulomb barrier, while the coupling to the breakup channel is more important at sub-barrier energies. The comparison of our calculations with recent data suggests that the coupling to other channels may be influencing the cross section at very low energies.

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Some commonly used approximations for complete fusion and breakup transmission coefficients in collisions of weakly bound projectiles at near barrier energies are assessed. We show that they strongly depend on the adopted classical trajectory and can be significantly improved with proper treatment of the incident and emergent currents in the WKB approximation.