2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/92282The stationary phase method is applied to diffusion by a potential barrier for an incoming wave packet with energies greater then the barrier height. It is observed that a direct application leads to paradoxical results. The correct solution, confirmed by numerical calculations is the creation of multiple peaks as a consequence of multiple reflections. Lessons concerning the use of the stationary phase method are drawn.8 pages, 2 figuresQuantum Physicstext