What happens when you bombard nickel atoms with lead atoms?
It depends on how fast they are moving! Actually, I do not
know any general answers for this, but I know that people
do these kinds of experiments these days in nuclear physics
to try to create new nuclei (transmuting the elements) to
measure "cross-sections" for radioactive processes (how fast
things should decay) to look at new nuclear energy levels and
strange nuclear shapes, and to look at the underlying constituents
(quarks, gluons) of the nuclei.
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Update: June 2012