  We consider the possibility that low-energy nuclear reactions (LENR) arise
due to the conversion of proton to neutron through weak interactions. The
resulting neutron forms a short-lived virtual state, which then gets captured
by another nucleus through photon emission. This whole process happens under
the framework of second-order perturbation theory. We find that the rate of
this process is negligibly small in most cases. However, in the presence of a
resonance, the rate can be substantial and observable.
