  We show the feasibility of calculating the decay energy spectrum of neutron
emitting nuclei within the Gamow-state description of resonances by obtaining
the decay energy spectrum of $^{25}$O. We model this nucleus as a valence
neutron interacting with an $^{24}$O inert core, and we obtain the resulting
resonant energies, widths and decay energy spectra for the ground and first
excited states. We also discuss the similarities and differences between the
decay energy spectrum of a Gamow state and the Breit-Wigner distribution with
energy-dependent width.
