= John Douglas Cockcroft
{c}
{tag=Physicist}
{title2=1897–1967}
= John Cockcroft
{c}
{synonym}
= John D. Cockcroft
{c}
{synonym}
= J. D. Cockcroft
{c}
{synonym}
<John Cockcroft> and <Ernest Walton> used accelerated <protons> to produce the disintegration of <lithium> in 1932. A high-<voltage> accelerator supplied the projectile beam, while the energetic <alpha particles> leaving the target provided the reaction signal. The reaction $p+{}^7\mathrm{Li}\to2\alpha$ releases nuclear <binding energy>, so the outgoing particles can carry far more <kinetic energy> than the incident <proton>. This connected a controlled electrical accelerator with a quantitative <nuclear reaction>.<Experiments with High Velocity Positive Ions. II. The Disintegration of Elements by High Velocity Protons by John Douglas Cockcroft and Ernest Thomas Sinton Walton>[1932 experiments, proton bombardment and lithium disintegration]{ref}
A <physicist>.https://www.nobelprize.org/nomination/archive/show_people.php?id=1855[Independent professional profile]{ref}https://archives.chu.cam.ac.uk/collections/guide-holdings/[Independent professional profile]{ref}
\Image[https://upload.wikimedia.org/wikipedia/commons/e/ec/Cockcroft.jpg]
{title=Portrait of <John Douglas Cockcroft>}
{width=240}
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