1901-1954. Italian-born US physicist, who proved the existence of new radioactive elements produced by bombardment with neutrons, and discovered nuclear reactions produced by low-energy neutrons. Nobel prize 1938. Born in Rome, he was professor of theoretical physics there from 1926 to 1938. He was professor at Columbia University, New York, from 1939 to 1942 and from 1946 at Chicago. In 1954, the US Atomic Energy Commission made a special award to him for outstanding work in nuclear physics; these annual awards have subsequently been known as Fermi awards.