Prof. Focardi coined similar explanation: proton gets drowned inside palladium/nickel atoms by getting negative charge, which allows it to get closer to atom nuclei. In palladium wire loaded by hydrogen and DC electric current hydrogen partially migrated to cathode.
Yes this is the way I found the mechanism to obtain dd cluster in the same location. If someone knows Prof. Focardi please contact him and forward this post.
>proton gets drowned inside palladium/nickel atoms by getting negative charge, which allows it to get closer to atom nuclei.
I do not think this is incorrect because the coulomb repulsive force shilding need the distance of 1A, because the cube of 1A*A*A can have electron but no electron in the cube of 10fm*10Fm*10fm.