 Fowler was appointed as Massey 's supervisor although it was clear that he did not need any supervision per se . Massey obtained his PhD on the The Collisions of Material Particles in 1932 . Shortly afterwards , he co @-@ authored a book on atomic collision processes with Nevill Mott , Theory of Atomic Collisions ( 1933 ) . He also applied the theory of collisions to models of neutron structure . At the Cavendish laboratory , he also played hockey with Cockcroft , and cricket for the Cavendish Cricket Club , becoming team captain in his final year there . 
