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The Nobel Prize in Physics 1935
James Chadwick

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James Chadwick - Facts

James Chadwick

James Chadwick

Born: 20 October 1891, Manchester, United Kingdom

Died: 24 July 1974, Cambridge, United Kingdom

Affiliation at the time of the award: Liverpool University, Liverpool, United Kingdom

Prize motivation: "for the discovery of the neutron"

Field: nuclear physics

Prize share: 1/1

Discovered the Neutron

In 1930, when Herbert Becker and Walter Bothe sent alfa particles (helium nuclei) against beryllium, strong penetrating radiation was emitted, there was a hypothesis that this could be electromagnetic radiation of high energy. However, in 1932 James Chadwick could show that in the reaction, a neutral particle with a mass about that of a proton, was emitted. Ernest Rutherford had earlier proposed that such a neutral particle might exist in nuclei. The particle was discovered and was named neutron.

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