Wave Mechanics and Radioactive Disintegration

@article{GurneyWaveMA,
  title={Wave Mechanics and Radioactive Disintegration},
  author={Ronald Wilfred Gurney and Edward Uhler Condon},
  journal={Nature},
  volume={122},
  pages={439-439}
}
AFTER the exponential law in radioactive decay had been discovered in 1902, it soon became clear that the time of disintegration of an atom was independent of the previous history of the atom and depended solely on chance. Since a nuclear particle must be held in the nucleus by an attractive field, we must, in order to explain its ejection, arrange for a spontaneous change from an attractive to a repulsive field. It has hitherto been necessary to postulate some special arbitrary ‘instability… 

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TLDR
This work is concerned with the tunnelling of heavy particles: nuclei, atoms, molecules, which have wavelengths as large or larger than atoms at energies found in the valence shells of molecules.
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