The original question on this thread is a bit ambiguous as a neutron is not ejected from a stable nucleus. The nucleus has to be unstable because of an unfavorable neutron to proton ratio or energy input from outside of the nucleus. Conservation of momentum alone can not account for the interactions within the nucleus from either situation. While the Fermi energy(Pauli Exclusion for fermions) and momentum transport may explain the rules, it says little about the inner mechanisms.
It may be difficult to separate "theory" from "application," but let''s see if this helps facilitate the discussion.
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