Suppose there is a material with heavy nuclei attached on its surface, presumably binded by the outer shell electrons. Now, the surface is exposed to a cold positron gas, which annihilates against some of these outer shell electrons.
What might happen with the heavy nuclei? do they have to become free from the material surface? can they become binded by inner shell electrons?
Also, i presume that as the positron gas annihilates the outer shell electrons, and further assuming that the heavy nuclei remain attached somehow to the surface, these heavy nuclei will increase their effective charge, so there might be an equilibrium condition where the repulsion of the heavy nuclei wards off the positron gas from further annihilating against the inner core electrons. Can this be validated heuristically? Is it just a plain wrong assumption?