2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/28337We study the charge of a small normal island connected by a tunnel junction to a superconducting lead. Unlike the N-I-N case, the steps of the Coulomb staircase remain sharp even if the conductance of the tunneling barrier exceeds e^2/h. One can observe the transition from sharp steps to the smeared ones by applying magnetic field to destroy the superconductivity.2 pages, 1 figureMesoscale and Nanoscale Physicstext