Individual #nuclear_physics__nuclearphysic__atomic_physics__nucleonics  the branch of physics that studies the internal structure of atomic nuclei
  >part of:  #physics__physic__physical_science__natural_philosophy__naturalphilosophy  the science of matter and energy and their interactions
  part:  #atomic_theory.scientific_theory__atomictheory  a theory of the structure of the atom

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