2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/18667Schmidt et al (Phys Rev Lett 86, 1191 (2001)) observe and analyze a negative specific heat in Na clusters. The analysis is done within the framework of Boltzmann-Gibbs equilibrium statistical mechanics. We argue that this is not the only physical possibility to be taken into account. A possible connection with nonextensive statistical mechanics is considered as well.7 pages including one figureStatistical MechanicsNuclear ExperimentNuclear Theorytext