Abstract

We reconstruct and analyze the path leading from James Chadwick’s discovery of the neutron in February 1932 through Frederic Joliot and Irene Curie’s discovery of artificial radioactivity in January 1934 to Enrico Fermi’s discovery of neutron-induced artificial radioactivity in March 1934. We show, in particular, that Fermi’s innovative construction and use of radon-beryllium neutron sources permitted him to make his discovery.

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