2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/116974Faddeev-Yakubovski equations are solved numerically for 4He tetramer and trimer states using realistic helium-helium interaction models. We describe the properties of ground and excited states, and we discuss with a special emphasis the 4He-4He3 low energy scattering.Atomic Physicstext