Project Y
Robert Oppenheimer (left), Leslie Groves (center) and Robert Sproul (right) at the ceremony to present the Los Alamos Laboratory with the Army-Navy E Award at the Fuller Lodge on 16 October 1945.
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| Established | 1 January 1943 |
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| Research type | classified |
| Budget | $57.88 million |
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Field of research
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Nuclear weapons |
| Director |
Robert Oppenheimer Norris Bradbury |
| Location |
Los Alamos, New Mexico, United States 35°52′32″N 106°19′27″W / 35.87556°N 106.32417°WCoordinates: 35°52′32″N 106°19′27″W / 35.87556°N 106.32417°W |
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Operating agency
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University of California |
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Los Alamos Scientific Laboratory
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| Location | Central Ave., Los Alamos, New Mexico |
| Coordinates | 35°52′54″N 106°17′54″W / 35.88167°N 106.29833°W |
| Built | 1943 |
| Architectural style | Bungalow/Craftsman, Modern Movement, Other |
| NRHP Reference # | 66000893 |
| Added to NRHP | 15 October 1966 |
The Los Alamos Laboratory, also known as Project Y, was a secret laboratory established by the Manhattan Project and operated by the University of California during World War II. Its mission was to design and build the first atomic bombs. Robert Oppenheimer was its first director, from 1943 to December 1945, when he was succeeded by Norris Bradbury. For scientists freely to discuss their work while preserving security, the laboratory was located in a remote part of New Mexico. The wartime laboratory occupied buildings that had once been part of the Los Alamos Ranch School.
The development effort initially concentrated on a gun-type fission weapon using plutonium called Thin Man. In April 1944, the Los Alamos Laboratory determined that the rate of spontaneous fission in plutonium bred in a nuclear reactor was too great due to the presence of plutonium-240 and would cause a predetonation, a nuclear chain reaction before the core was fully assembled. Oppenheimer then reorganized the laboratory and orchestrated an all-out and ultimately successful effort on an alternative design proposed by John von Neumann, an implosion-type nuclear weapon, which was called Fat Man. A variant of the gun-type design known as Little Boy was developed using uranium-235.
Chemists at the Los Alamos Laboratory developed methods of purifying uranium and plutonium, the latter a metal that only existed in microscopic quantities when Project Y began. Its metallurgists found that plutonium had unexpected properties, but were nonetheless able to cast it into metal spheres. The laboratory built the Water Boiler, an aqueous homogeneous reactor, the third reactor in the world to become operational. It also researched the Super, a hydrogen bomb that would use a fission bomb to ignite a nuclear fusion reaction in deuterium and tritium.
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