This was followed by a master's degree at Australia's first cyclotron, where he began his work as a high-energy physicist.
[1] Following work at the Cavendish Laboratory and completion of his PhD, Rushbrooke spent a year at CERN in Geneva before returning to Cambridge to take up a fellowship at Downing College as director of studies in physics.
[1] For five years from 1977 he was on leave from his duties at Cambridge, based again at CERN, where he became the spokesperson for the UA5 collaboration.
[1] The UA5 experiment searched for Centauro events at the Proton-Antiproton Collider, a modification of the Super Proton Synchrotron.
[3] In 1983 Rushbrooke was promoted to a readership in physics at Cambridge, and in 1991 the university conferred on him a second doctorate.