Hahn, Otto & Fritz Strassman | Über das Zerplatzen des Urankernes durch langsame Neutronen

The Abhandlungen offprint of the first of Hahn and Strassman’s “three fundamental papers on nuclear fission, containing the first comprehensive account of the phenomenon” (Hook & Norman, Norman Library of Science and Medicine 963). Abhandlungen issues in the green wrappers are not true offprints because they could contain multiple papers, though in the case of the Hahn & Strassman fission papers each contains only the one paper. Offprints in the orange wrappers labelled “Einzelausgabe” are the true offprints, as these only ever contained a single paper.

"In 1938 Hahn and Strassman had demonstrated the presence of radioactive barium, lanthanum and cerium among the products of neutron bombardment of uranium, an observation that seemed to contradict all previous experiences of nuclear physics” (Norman 963). They announced these unexplained findings in an earlier paper published in Naturwissenschaften on January 6^th, 1939, but before that wrote to Lise Meitner, then in exile in Copenhagen, “telling her of their baffling discovery and asking for advice. It was this letter that inspired Meitner and her nephew Otto Frisch to create their hypothesis of a fission process, which they published on 11 February 1939” (Norman). The present paper was presented at the May 25^th, 1939 meeting of the Akademie and published on September 18^th of that year. The following two papers in this series would not appear until 1942 and 1944.