Thin Man (nuclear bomb) Thin Man (nuclear bomb) "Thin Man" was the code name for a proposed plutonium gun-type nuclear bomb using plutonium-239 which the United States was developing during the Manhattan Project. They aborted its development when they discovered that the spontaneous fission rate of their nuclear reactor-bred plutonium was too high for use in a gun-type design, due to the high concentration of the isotope plutonium-240. In 1942, prior to the Army taking over wartime atomic research, Robert Oppenheimer held conferences in Chicago in June and Berkeley, California, in July at which various engineers and physicists discussed nuclear bomb design issues. A
Nagasaki Atomic Bomb Museum bomb was dropped, the devastation produced by the bomb, and the history of nuclear arms development. The Nagasaki Atomic Bomb Museum covers the history of the bombing of Nagasaki, Japan. It portrays scenes of World War II, the dropping of the atomic bomb, the reconstruction of Nagasaki, and present day. Additionally, the museum exhibits the history of nuclear weapons development. The atomic bomb was developed by scientists working under the Manhattan Project. The project was granted funding on December 6, 1941, with American leaders aiming for a new invention that would serve as a wartime weapon. The decision to drop