Limits on the neutron-antineutron oscillation time from the stability of nuclei

We refute a recent claim by Nazaruk that the limits placed on the free--space neutron--antineutron oscillation time $τ_{n\bar n}$ can be improved by many orders of magnitude with respect to the estimate $τ_{n\bar n}>2(T_0/Γ)^{1/2}$, where $T_0$ is a measured limit on the annihilation lifetime of a nucleus and $Γ\sim 100$ MeV is a typical antineutron-nucleus annihilation width.

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