Article révisé par les pairs
Résumé : The α+6He elastic scattering is investigated within a microscopic multicluster model, involving a realistic description of the 6He halo nucleus. Phase shifts and elastic-scattering cross sections are calculated up to Ec.m. = 15 MeV with two variants of the resonating-group method. The model gives rise to 1- and 3- molecular states near Ec.m.=0.5 MeV and Ec.m.=3.7 MeV, respectively. We suggest that the broad 3- resonance should be observable by comparing elastic cross sections at different energies. We also evaluate the order of magnitude of the 6He breakup cross section.