  The relationship between the lower limit on the nuclear stability lifetime as
derived from the non disappearance of `stable` nuclei
($T_{d}~\gtrsim~5.4~\times~10^{31}$ yr), and the lower limit thus implied on
the oscillation time $(\tau_{n \bar n})$ of a possibly underlying
neutron-antineutron oscillation process, is clarified by studying the time
evolution of the nuclear decay within a simple model which respects unitarity.
The order-of-magnitude result $\tau_{n \bar n} \approx 2 (T_{d}/\Gamma_{\bar
n})^{1/2} > 2 \times 10^{8}$ sec, where $\Gamma_{\bar n}$ is a typical $\bar n$
nuclear annihilation width, agrees as expected with the limit on $\tau_{n \bar
n}$ established by several detailed nuclear physics calculations, but sharply
disagreeing by 15 orders of magnitude with a claim published recently in Phys.
Rev. CRAP.
