  The study of photon-induced reactions in collisions of heavy nuclei at RHIC
and the LHC has become an important direction of the research program of these
facilities in recent years. In particular, the production of vector mesons in
ultra-peripheral collisions (UPC) has been intensively studied. Owing to the
intense photon fluxes, the two nuclei participating in such processes undergo
electromagnetic dissociation producing neutrons at beam rapidities. Here, we
introduce the $\textbf{n$\mathbf{_O^O}$n}$ (pronounced noon) Monte Carlo
program, which generates events containing such neutrons.
$\textbf{n$\mathbf{_O^O}$n}$ is a ROOT based program that can be interfaced
with existing generators of vector meson production in UPC or with theoretical
calculations of such photonuclear processes. $\textbf{n$\mathbf{_O^O}$n}$ can
also be easily integrated with the simulation programs of the experiments at
RHIC and the LHC.
