Chadwick, Sir James

Chadwick, Sir James

▪ British physicist
born Oct. 20, 1891, Manchester, Eng.
died July 24, 1974, Cambridge, Cambridgeshire

      English physicist who received the Nobel Prize for Physics in 1935 for the discovery of the neutron.

      Educated at the universities of Manchester and Cambridge, Chadwick also studied under Hans Geiger at the Technische Hochschule, Berlin. From 1923 he worked with Ernest Rutherford in the Cavendish Laboratory, Cambridge, where they studied the transmutation of elements by bombarding them with alpha particles and investigated the nature of the atomic nucleus, identifying the proton, the nucleus of the hydrogen atom, as a constituent of the nuclei of other atoms.

      In 1932 Chadwick observed that beryllium, when exposed to bombardment by alpha particles, released an unknown radiation that in turn ejected protons from the nuclei of various substances. Chadwick interpreted this radiation as being composed of particles of mass approximately equal to that of the proton, but without electrical charge—neutrons.

      This discovery provided a new tool for inducing atomic disintegration, since neutrons, being electrically uncharged, could penetrate undeflected into the atomic nucleus. Chadwick was knighted in 1945.

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Universalium. 2010.

Look at other dictionaries:

  • Chadwick,Sir James — Chadwick, Sir James. 1891 1974. British physicist. He won a 1935 Nobel Prize for his discovery of the neutron. * * * …   Universalium

  • Chadwick , Sir James — (1891–1974) British physicist Chadwick was born in Macclesfield and was educated at the University of Manchester, where he graduated in 1911 and remained as a graduate student under Ernest Rutherford. In 1913 he went to Leipzig to work under Hans …   Scientists

  • Chadwick, sir James — ► (1891 1974) Físico británico. Fue premio Nobel de Física en 1935, por su descubrimiento del neutrón …   Enciclopedia Universal

  • Chadwick — Sir James …   Scientists

  • Chadwick — Chadwick, Lynn Chadwick, sir James …   Enciclopedia Universal

  • Chadwick — (sir James) (1891 1974) physicien brit. Il reconnut en 1932 l existence du neutron. P. Nobel 1935 …   Encyclopédie Universelle

  • James Chadwick — Sir James Chadwick (* 20. Oktober 1891 in Bollington, Cheshire; † 24. Juli 1974 in Cambridge) war ein englischer Physiker. Er war Nobelpreisträger für Physik im Jahre 1935. Den Nobelpreis erhielt er für die Entdeckung des Neutrons. James Chadwick …   Deutsch Wikipedia

  • James Chadwick — Físico inglés …   Wikipedia Español

  • James Chadwick — Sir James Chadwick (n. Manchester, 20 de octubre de 1891 † Cambridge, 24 de julio de 1974). Físico inglés. Estudió en la Universidad de Manchester y en la Universidad de Cambridge. En 1914 fue a estudiar con Hans Geiger en la Technische… …   Enciclopedia Universal

  • Chadwick — [chad′wik] Sir James 1891 1974; Eng. physicist: discovered the neutron …   English World dictionary

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