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High Quality Content by WIKIPEDIA articles! The "Thin Man" (formally, Mark 2) nuclear bomb was a proposed plutonium gun-type nuclear bomb which the United States was developing during the Manhattan Project. Its development was aborted when it was discovered that the spontaneous fission rate of nuclear reactor-bred plutonium was too high for use in a gun-type design.The "Thin Man" design was an early nuclear weapon design proposed before plutonium had been successfully bred in a nuclear reactor from the irradiation of uranium-238. It was assumed that plutonium, like uranium-235, would be able…mehr

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High Quality Content by WIKIPEDIA articles! The "Thin Man" (formally, Mark 2) nuclear bomb was a proposed plutonium gun-type nuclear bomb which the United States was developing during the Manhattan Project. Its development was aborted when it was discovered that the spontaneous fission rate of nuclear reactor-bred plutonium was too high for use in a gun-type design.The "Thin Man" design was an early nuclear weapon design proposed before plutonium had been successfully bred in a nuclear reactor from the irradiation of uranium-238. It was assumed that plutonium, like uranium-235, would be able to be assembled into a critical mass by simply shooting a sub-critical piece of it into another sub-critical piece. To avoid pre-detonation, a plutonium "bullet" would need to be accelerated to a speed of at least 3,000 feet per second (910 m/s)?if not, then the plutonium would begin a nuclear fission reaction before fully assembling and blow itself apart prematurely.