The German nuclear energy project (German: Uranprojekt; informally known as the Uranverein; English: Uranium Club), was an attempted clandestine scientific effort led by Germany to develop and produce atomic weapons during the events of World War II. This program started in April 1939, just months after the discovery of nuclear fission in January 1939, but ended only months later, due to German invasion of Poland, where many notable physicists were drafted into the Wehrmacht. However, the second effort began under the administrative auspices of the Wehrmacht's Heereswaffenamt on the day World War II began (1 September 1939). The program eventually expanded into three main efforts: the Uranmaschine (nuclear reactor), uranium and heavy water production, and uranium isotope separation. Eventually it was assessed that nuclear fission would not contribute significantly to ending the war, and in January 1942, the Heereswaffenamt turned the program over to the Reich Research Council while continuing to fund the program. At this time, the program split up between nine major institutes where the directors dominated the research and set their own objectives. At that time, the number of scientists working on applied nuclear fission began to diminish, with many applying their talents to more pressing war-time demands.
The most influential people in the Uranverein were Kurt Diebner, Abraham Esau, Walther Gerlach, and Erich Schumann; Schumann was one of the most powerful and influential physicists in Germany. Diebner, throughout the life of the nuclear energy project, had more control over nuclear fission research than did Walther Bothe, Klaus Clusius, Otto Hahn, Paul Harteck, or Werner Heisenberg. Abraham Esau was appointed as Hermann Göring's plenipotentiary for nuclear physics research in December 1942; Walther Gerlach succeeded him in December 1943.
Politicization of the German academia under the National Socialist regime had driven many physicists, engineers, and mathematicians out of Germany as early as 1933. Those of Jewish heritage who did not leave were quickly purged from German institutions, further thinning the ranks of academia. The politicization of the universities, along with the demands for manpower by the German armed forces (many scientists and technical personnel were conscripted, despite possessing useful skills), would eventually all but eliminate a generation of physicists.
At the end of the war, the Allied powers competed to obtain surviving components of the nuclear industry (personnel, facilities, and materiel), as they did with the V-2 program.
Read more about German Nuclear Energy Project: Discovery of Nuclear Fission, First Uranverein, Second Uranverein, Isotope Separation, Moderator Production, Internal Reports, Politicisation, Exploitation and Denial, Comparison of The Manhattan Project and The Uranverein, Recent Developments
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