A ‘Nuclear Photo-effect’: Disintegration of the Diplon by γ-Rays

  title={A ‘Nuclear Photo-effect’: Disintegration of the Diplon by $\gamma$-Rays},
  author={James Sir Chadwick and Maurice Goldhaber},
BY analogy with the excitation and ionisation of atoms by light, one might expect that any complex nucleus should be excited or ‘ionised’, that is, disintegrated, by y-rays of suitable energy. Disintegration would be much easier to detect than excitation. The necessary condition to make disintegration possible is that the energy of the y-ray must be greater than the binding energy of the emitted particle. The y-rays of thorium C of v = 2-62 × 106 electron volts are the most energetic which are… 

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