2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/215994The longitudinal response function of 4He is calculated with the Argonne V18 potential. The comparison with experiment suggests the need of a three-body force. When adding the Urbana IX three-body potential in the calculation of the lower longitudinal multipoles, the total strength is suppressed in the quasi-elastic peak, towards the trend of the experimental data.3 pages, 3 figures, proceedings of the 20th European Conference on Few-Body Problems in Physics (EFB20)Nuclear Theorytext