Dr Ernest T S Walton in the cabinet (marked E) into which the high-velocity protons emerge and strike the target of lithium, producing on a fluorescent screen bright scintillations which indicate that helum particles are being driven out of the lithium nucleus - the lithium nucleus appearing to break up into two helium nuclei. Physicists Walton and J D Cockcroft developed the Cockcroft-Walton accelerator in the Cavendish Laboratory at Cambridge University to artificially accelerate atomic partic