Résumé : An effective nucleon-nucleon interaction adapted to cluster-model calculations of collisions is derived from the realistic Argonne potential AV18 with the unitary correlation operator method. The unitary correlation is determined from the α+α elastic phase shifts calculated in a cluster approach by the generator coordinate method coupled with the microscopic R-matrix method. With this interaction, the elastic phase shifts for the α+n, α+p, and α+3He collisions are calculated within the same model. Without further adjustment, a good agreement with experimental data is obtained with a small model space. © 2011 American Physical Society.