Sir James Chadwick, a British physicist, is best known for his discovery of the neutron.
In 1911, Chadwick began research into the atomic structure which was to become a lifelong interest and which would eventually make him internationally famous.
Chadwick’s discovery was a major breakthrough and the neutron soon proved to be a valuable tool in research and lead to the discovery of nuclear fission and the first nuclear reactor.
The use of neutrons in atomic fission led to the production of the atomic bomb. Chadwick was awarded the Nobel prize for physics in 1935 for his discovery.