The drawing or why history is not mathematics (Q1407811)

There is a mystery of whether or not Werner Heisenberg gave Niels Bohr in 1941 a drawing that Bohr came to believe was that of a German nuclear weapon. In September of 1943 Bohr was warned that the Gestapo was going to arrest him. He escaped to Sweden with his family. Then he traveled to London and began a series of briefings and debriefings about the German and Allied programs. In December he and his son Aage, a physicist, visited Los Alamos, USA, together with General Groves, who was alarmed by conversations. Oppenheimer was ordered to convene a group to listen to what Bohr had to say about the German program. In the present paper the mystery above is dicussed and resolved under headings: `The Drawing', `The Los Alamos Meeting', `Reactor Physics and the German Project', `Bohr and the Bomb', `Jensen and the German Project', `Bohr's Understanding of Reactor Design'. The author's basic premise is that Aage Bohr was right: no drawing was given to his father by Heisenberg in 1941. But something happened in 1943 that was relevant to Bohr's understanding of the German program. This could be Jensen's visit to Copenhagen in 1943. The author concludes: ``I readily admit that I have not given a mathematical proof that Heisenberg did not give Bohr a drawing\dots History is not mathematics''.