Emilio Gino Segrè was an Italian-American nuclear physicist and radiochemist who discovered the elements technetium and astatine, and the antiproton, a subatomic antiparticle, for which he was awarded the Nobel Prize in Physics in 1959, along with Owen Chamberlain. The Nobel Prize in Physics 1959, announced October 26, 1959. Emilio Segrè and Owen Chamberlain, “for their discovery of the antiproton”. Emilio Segrè: born 1905, Tivoli, Italy. Owen Chamberlain: born 1920, San Francisco, CA, USA. Wiki link Wiki link Data: the Nobel Foundation (CC0).