Cockcroft,
Sir John Douglas 1897-1967; Eng. nuclear physicist
See Cockcroft in American Heritage Dictionary 4
(kŏkˈkrôftˌ, -krŏftˌ), Sir John Douglas 1897-1967.
British physicist who with Ernest Walton succeeded in splitting the atom (1931). They shared a 1951 Nobel Prize for their contributions to nuclear physics.