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On Nov 24, 2012, at 13:33, mix...@bigpond.com wrote: > As mentioned previously, the fast D nuclei will lose most of their energy to > valence Pd electrons, this analogy doesn't work very well. It would be more > like > a pinball machine that was coated with glue. The ball doesn't get very far. If Ron's mechanism works with Kshell vacancies, could it also work with valence electron vacancies? I think this would mean there would be an elastic collision instead of photon emission. In that case, would there necessarily be a loss of momentum for the lower energy incident D nucleus? Eric