The allegations of sabotage carry little weight. Germany had a significant head start over the Manhattan Project as well as some of the best scientists, a strong industrial base, sufficient materials, and the interest of its military officers.  Development did continue with a "uranium motor" for the navy and development of a German cyclotron. Following their invasion of Norway in 1940, the Germans assumed control of the Norsk Hydro heavy water plant at Vemork. To begin with, communications between different areas were extremely poor. Victor Weisskopf recounted Bohr telling him, “Heisenberg wanted to know if Bohr knew anything about the nuclear program of the Allies. The bigger problem, however, lay in lack of support. Heisenberg's efforts were derailed in part by his decision to use heavy water instead of graphite as a "moderator" to slow and control the fission process. The United States government remained equally afraid. He said, "I didn't report it to the Führer until two weeks later and very casually because I did not want the Führer to get so interested that he would order great efforts immediately to make the atomic bomb. Also see footnote No. Paul Harteck was director of the physical chemistry department at the University of Hamburg and an advisor to the Heereswaffenamt (HWA, Army Ordnance Office). Diebner, throughout the life of the nuclear weapon project, had more control over nuclear fission research than did Walther Bothe, Klaus Clusius, Otto Hahn, Paul Harteck, or Werner Heisenberg.. Other scientists left in protest, significantly decreasing the number of experts available to work on a German bomb. Furthermore, combined with the Deutsche Physik movement, the damaging effects were intensified and prolonged. Hentschel and Hentschel, 1996, Appendix F; see the entry for Thiessen. 2, in Moscow, and included Yulij Borisovich Khariton, Isaak Konstantinovich Kikoin, and Lev Andreevich Artsimovich. For information on the American and Russian exploitation of Germany after World War II, see: Norman M. Naimark. 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), substantially reduced the number of able German physicists.. According to Berlin historian Rainer Karlsch in his book Hitler’s Bomb, German scientists carried out three nuclear weapons tests just before the end … Abraham Esau was appointed on 8 December 1942 as Hermann Göring's Bevollmächtigter (plenipotentiary) for nuclear physics research under the RFR; in December 1943, Esau was replaced by Walther Gerlach. In a 1942 meeting with Albert Speer, the Minister of Armaments and War Production, Heisenberg made a reference to the amount of U-235 necessary and caused a small sensation when he used the word “bomb” – many of the scientists and officials present were not aware that this was actually possible. By Dan Charles.  On 27 April 1945, Thiessen arrived at von Ardenne's institute in an armored vehicle with a major of the Soviet Army, who was also a leading Soviet chemist, and they issued Ardenne a protective letter (Schutzbrief). It went through several phases of work, but in the words of a historian, it was ultimately "frozen at the laboratory level" with the "modest goal" to "build a nuclear reactor which could sustain a nuclear fission chain reaction for a significant amount of time and to achieve the complete separation of at least tiny amount of the uranium isotopes." Significant work on the German project was halted in June of 1942. As to condition four, the high priority allocated to the Manhattan Project allowed for the recruitment and concentration of capable scientists on the project.  Frisch confirmed this experimentally on 13 January 1939. This book tells the story of German nuclear research from 1930's to 1945. Cited in Hentschel and Hentschel, 1996, p. 279, but omitted from the anthology. A second meeting was held soon thereafter and included Klaus Clusius, Robert Döpel, Werner Heisenberg, and Carl Friedrich von Weizsäcker. 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 pioneering V-2 SRBM program. In his lecture it was clear he was talking to people who were quite ignorant… Apparently the other people didn’t know very much about fission…” (Powers 451). Hentschel and Hentschel, 1996, 363–364 and Appendix F; see the entries for Diebner and Döpel.  The reorganization was done under the initiative of Minister Albert Speer of the RMBM; it was necessary as the RFR under Bernhard Rust the Minister of Science, Education and National Culture was ineffective and was not achieving its purpose. Letter to Bernhard Rust, 20 January 1942. , When it was apparent that the nuclear weapon project would not make a decisive contribution to ending the war in the near term, control of the KWIP was returned in January 1942 to its umbrella organization, the Kaiser-Wilhelm Gesellschaft (KWG, Kaiser Wilhelm Society, after World War II the Max-Planck Gesellschaft).  Before the end of World War II, Thiessen, a member of the Nazi Party, had Communist contacts. He was director of the Physics Department II at the Frederick William University (later, University of Berlin), which was commissioned and funded by the Oberkommando des Heeres (OKH, Army High Command) to conduct physics research projects. The two women knew each other as a result of Heisenberg's maternal grandfather and Himmler's father being rectors and members of a Bavarian hiking club. Hentschel and Hentschel, 1966, Appendix F; see the entry for Carl Ramsauer. The United States government became aware of the German nuclear program in August 1939, when Albert Einstein wrote to President Roosevelt, warning \"that it may become possible to set up a nuclear chain reaction in a large mass of uranium by which vast amounts of power and large quantities of new radium-like elements would be generated.\" The United States was in a race to develop an atomic bomb believing whoever had the …  Otto Robert Frisch, who with Rudolf Peierls first calculated the critical mass of U-235 needed for an explosive, was also a Jewish refugee. Clearly, the German scientists did not believe they could extract sufficient U-235 to make a bomb and so did not urge Speer to commit German industry … German Translation of “ atomic bomb” | The official Collins English-German Dictionary online. The Farm Hall transcripts also show the ignorance of Walther Gerlach, the scientific liaison to the German government, an important link in coordinating the project. As one German scientist exclaimed, it must have taken "factories large as the United States to make that much uranium-235!". Near the end of World War II, the principal Allied war powers each made plans for exploitation of German science. This work unravels the myths and controversies surrounding Hitler's atomic bomb project. The only section of the institute which remained in Berlin was the low-temperature physics section, headed by Ludwig Bewilogua [de], who was in charge of the exponential uranium pile.. 93 in Hentschel and Hentschel, 1996, pp. This move allowed the Americans to take into custody a large number of German scientists associated with nuclear research. In his book entitled The SS Brotherhood of the Bell, author James P. Farrell wrote about "the alleged German test of a small critial mass, high yield atom bomb at or near the Ohrdruf …  Their article was published on 6 January 1939. 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. In light of the implications of nuclear weapons, German nuclear fission and related technologies were singled out for special attention. Hentschel, Klaus (editor) and Ann M. 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