First image of proton hitting a nucleus

First image of proton hitting a nucleus

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Caption: One of the first cloud chamber photographs showing the disintegration of an atomic nucleus struck by an artificially accelerated proton. A pair of alpha particles shoot out in opposite directions (towards top right & bottom left) following the disintegration of a lithium nucleus. The nucleus was struck by a proton accelerated in Cockfroft & Walton's prototype particle accelerator at the Cavendish Laboratory, Cambridge. The photograph was taken by Walton & P. I. Dee in 1933. The lower end of the accelerating tube, which contained the lithium target, can be seen projecting into the cloud chamber.

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Keywords: cloud chamber image, cloud chamber imagery, dee, first, historica, historical, history, particle physics, particles, photo, subatomic track, tracks, walton

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