Absolutely! Widom-Larsen (where an electron combines with a Proton to form a Neutron and a Neutrino). has a critical mass, similar to the Coulomb barrier for regular fusion.
The muon:proton has enough mass, and is known to happen. But electron:proton doesn't --WL proposes one method of getting an effective electron mass. I haven't read the paper yet. ----- Original Message ----- > Any opinions on whether this is relevant to any commercial LENR > efforts?