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John Cockcroft, British physicist

John Cockcroft, British physicist

C029/2487

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25.1 MB (4.5 MB compressed)

3606 x 2431 pixels

30.5 x 20.6 cm ⏐ 12.0 x 8.1 in (300dpi)

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Credit

EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY

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Editorial use only.

Caption

John Cockcroft (1897-1967). Portrait of the British physicist John Cockcroft at the controls of a of Cockcroft Walton Accelerator. In 1932, Cockcroft performed the first artificial disintegration of an atomic nucleus. He bombarded a lithium nucleus with protons in a particle accelerator, and observed two alpha particles (helium nuclei) being produced. Study of the energies of these particles verified Einstein's theory of mass-energy equivalence. He was awarded the 1951 Nobel Prize for Physics for this work, along with Ernest Walton. The Cockcroft Walton Accelerator was a particle accelerator powered by a Cockcroft-Walton generator (multiplier). Photographed in the Cavendish Laboratory, University of Cambridge, UK, in 1934.

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