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deuteron IS NOT does not contain a proton and a neutron
That seems unhelpful. There is a /shell structure/
for the nucleons inside a nucleus, more-or-less analogous
to the shell structure for the atomic electrons.
http://en.wikipedia.org/wiki/Nuclear_shell_model
That wouldn't be happening if there were not reasonably
well-defined protons and nucleons running round inside
the nucleus. Like any model, the nuclear shell model
has its advantages and disadvantages ... but it would
be nuts to dismiss it out of hand.