Possible Existence of a Neutron

@article{Chadwick1932PossibleEO,
  title={Possible Existence of a Neutron},
  author={James Sir Chadwick},
  journal={Nature},
  year={1932},
  volume={129},
  pages={312-312}
}
IT has been shown by Bothe and others that beryllium when bombarded by α-particles of polonium emits a radiation of great penetrating power, which has an absorption coefficient in lead of about 0.3 (cm.)−1. Recently Mme. Curie-Joliot and M. Joliot found, when measuring the ionisation produced by this beryllium radiation in a vessel with a thin window, that the ionisation increased when matter containing hydrogen was placed in front of the window. The effect appeared to be due to the ejection of… 
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