2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186936We present results related to the search of SU(2) instantons on a geometry $[0,L]^3\times [0,T]$ obtained using over-improved cooling with fixed boundary conditions. We also introduce a criterion for finding a sphaleron at the top of the energy barrier of the instanton path.6p, ps-file (uuencoded), preprint INLO-PUB 14/93, FTUAM-93/39. Contribution to Lattice'93 Conference (Dallas, 1993)High Energy Physics - LatticeHigh Energy Physics - Theorytext