$n - \bar{n}$ oscillations in deuterium

Neutron-antineutron ($n - \bar{n}$) oscillation requires interactions that change baryon number by 2 units ($\delta B=2$), hence providing a stage for physics beyond Standard Model. We generalize the pionless nuclear effective field theory to include $\delta B=2$ interactions, and examine $n - \bar{n}$ oscillation in vacuum and in nuclei. We provide, in leading order in a controlled expansion, a model-independent link between the $n - \bar{n}$ vacuum oscillation time and the lifetime of deuteron. We compare our result with previous model estimates, and discuss extensions to other nuclei and to subleading orders.