Thinking about it, that would mean they emit some kind of Bremsstrahlung, or not? If that is the case, I am wondering about the angular distribution of the emitted gamma photons... I would consider it rather random. This would beg the question, how do you focus and direct the gamma beam into the gold can?
The result is a nice, tight, collimated beam of hard X-rays. Pretty awesome! But I'm not sure that SLAC has the power for this experiment - they probably would have done it already if they did...
