The existence of a neutron

  title={The existence of a neutron},
  author={James Sir Chadwick},
  journal={Proceedings of The Royal Society A: Mathematical, Physical and Engineering Sciences},
  • J. Chadwick
  • Published 1 June 1932
  • Physics
  • Proceedings of The Royal Society A: Mathematical, Physical and Engineering Sciences
§ 1. It was shown by Bothe and Becker that some light elements when bombarded by α-particles of polonium emit radiations which appear to be of the γ-ray type. The element beryllium gave a particularly marked effect of this kind, and later observations by Bothe, by Mme. Curie-Joliot and by Webster showed that the radiation excited in beryllium possessed a penetrating power distinctly greater than that of any γ-radiation yet found from the radioactive elements. In Webster’s experiments the… 

Figures from this paper

Production and Nuclear Interaction of Neutrons

In the year 1930, Bothe and Becker discovered artificial nuclear γ-radiation. They bombarded Li, Be, B, and other light elements with α-particles from a polonium preparation and with a needle counter

Combination of Proton and Neutron

SOME time ago, experiments were made, in collaboration with Dr. L. H. Gray, in which the scattering of neutrons by various materials was detected, with the aid of a high-pressure ionisation chamber

Mass-Energy and the Neutron in the Early Thirties

The Argument Einstein's mass-energy relationship was not confirmed experimentally until 1933 when Bainbridge showed that the Cockcroft-Walton experiment afforded a test of it. Earlier, however, it

Weak interactions of the neutron

The most familiar manifestation of the weak interaction is nuclear beta decay and the most elementary beta -active nucleus is the neutron itself. The author examines the advantages and limitations of

Discovery of Radioactivity

Isotope Effect is the Paradigm of A Non-accelerator Study of the Residual Nuclear Strong Interaction

Artificial activation of the strong interaction by adding of one neutron to the nucleus causes the global reconstruction of the macroscopic characteristics of solids. The experimental evidence of

The possible discovery of neutron activation in 1910

One-hundred-two years ago, on 21 April 1910, the Austrian chemist Carl Auer von Welsbach published a short comment on a fundamental discovery he had made in the field of nuclear sciences. He reported

Nuclear Structure and Dynamics in the Quasi-Continuum of ²⁴⁰Pu

Nuclear level densities and γ-ray strength functions are essential quantities in various fields of basic and applied research involving nuclear matter. From microscopic calculations and structure