2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/81630The Faddeev-Yakubovsky equations in configuration space have been solved for the four nucleon system with special interest in their scattering states. We present results concerning the structure of the first $^4$He, scattering states in different (T,S) channels including the first inelatic threshold N+3N$\to$NN+NN and the n-t cross section using realistic potentials.6 pages, 4 figures Contribution to the First Asia-Pacific Conference, Tokyo, August 23-28 (1999)Nuclear Theorytext