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The separation energy and half-life of some heavy proton emitting nuclei, and the single-particle structure of the unbound 11 N , have been evaluated by implementing a careful numerical treatment to solve Schrödinger equation in a continuum discretization context. The basic scheme behind the method consists in using the ground-state proton emitter in connection with an isolated single-particle resonance.Keywords: Decay by proton emission; lifetimes; single-particle levels. Recently, several unstable proton emitting nuclei with medium and heavy masses [1,2,3,4,5,6,7,8,9,10,11] have been discovered and are attracting much attention in both theoretical and experimental nuclear physics. In the light mass limit unbound 11 N is another well studied proton emitter nucleus which presents some intriguing phenomena such as the s 1/2 intruder level and the 11 Be mirror states discussed in the recent literature [12,13,14].The parent nucleus decays by proton emission in a quantum tunneling process. In a first approximation we can treat this problem as an unbound proton + core system in which the ground-states instabilities are studied from the single-particle resonance point of view. These

All eigenvalues and eigenvectors of states which occur in the lowest 20-30 MeV of excitation energy are calculated in the full d52/-s1/2-d3/2 model space for several sd shell nuclei and are analysed in terms of their statistical features.