Nuclear physicists in front of the 60-inch cyclotron (particle accelerator) in the Lawrence Radiation Laboratory,University of California,Berkeley,USA. From left to right are; Luis W Alvarez (1911-1988),William Coolidge (1873-1975),William Brobeck (1908-1988),Donald Cooksey (1892-1977),Edwin McMillan (1907-1991) and the inventor of the cyclotron Ernest Lawrence (1901-1958). This was the most powerful cyclotron of its day. It was used by the Manhattan Project during World War II to produce several artificial elements,including plutonium. Photographed in 1939,shortly after the cyclotron's completion |