2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/134450We review results on scattering observables for $^4$He--$^4$He$_2$ and $^3$He--$^4$He$_2$ collisions. We also study the effect of varying the coupling constant of the atom-atom interaction on the scattering length.Atomic and Molecular ClustersChemical Physicstext