Recent evidence indicates the charge radius of proton is smaller in the presence of a muon than in the presence of an electron. http://en.wikipedia.org/wiki/Proton#Charge_radius
Since a muon is a massive cousin of the electron, a muon's orbit is much smaller than an electron and therefore its orbital speed is much greater. This could mean that the charge radius of proton might depend inversely on the speed of negatively charged particles in the proton's neighborhood. If so, then protons (hydrogen ions) will tend to swell even more inside a lattice because they are bathed by even slower moving electrons. If the swelling also extends the reach of the strong force, this might enable protons to fuse with the lattice nuclei. Harry
