2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/226954We demonstrate that non-exponential decays of unstable systems can be understood as yet another example of nonextensivity encountered in many physical systems and as such can be characterized by the nonextensivity parameter q.LaTex file only, 8 pages, no figures. Corrected version, to be published in Phys. Lett. AHigh Energy Physics - PhenomenologyCondensed MatterNuclear Theorytext