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199-600: Trinity was the code name of the first detonation of a nuclear weapon , conducted by the United States Army at 5:29 a.m. MWT (11:29:21 GMT ) on July 16, 1945, as part of the Manhattan Project . The test was of an implosion-design plutonium bomb, nicknamed " The Gadget ", of the same design as the Fat Man bomb later detonated over Nagasaki , Japan, on August 9, 1945. Concerns about whether

398-497: A marketing buzz for the project). Still others (such as Microsoft ) discuss code names publicly, and routinely use project code names on beta releases and such, but remove them from final product(s). In the case of Windows 95, the code name "CHICAGO" was left embedded in the INF File structure and remained required through Windows Me. At the other end of the spectrum, Apple includes the project code names for Mac OS X as part of

597-417: A nuclear fusion reaction between deuterium and tritium . Teller proposed scheme after scheme, but Bethe rejected each one. The fusion idea was set aside to concentrate on producing fission bombs. Teller also raised the speculative possibility that an atomic bomb might "ignite" the atmosphere because of a hypothetical fusion reaction of nitrogen nuclei, but Bethe calculated that this could not happen, and

796-569: A sawmill , ice house , barns , carpentry shop, stables and garages , all totalling 29,560 square feet (2,746 m ). At the nearby Anchor Ranch there were four houses and a barn. Construction work was supervised by the Albuquerque Engineer District until 15 March 1944, when the Manhattan Engineer District assumed responsibility. Willard C. Kruger and Associates of Santa Fe, New Mexico ,

995-453: A "B", cargo aircraft with a "C". Training aircraft and reconnaissance aircraft were grouped under the word "miscellaneous", and received "M". The same convention applies to missiles, with air-launched ground attack missiles beginning with the letter "K" and surface-to-surface missiles (ranging from intercontinental ballistic missiles to antitank rockets) with the letter "S", air-to-air missiles "A", and surface-to-air missiles "G". Throughout

1194-482: A "pivotal" role in Soviet air-strategy. Code names were adopted by the following process. Aerial or space reconnaissance would note a new aircraft at a Warsaw Pact airbase. The intelligence units would then assign it a code name consisting of the official abbreviation of the base, then a letter, for example, "Ram-A", signifying an aircraft sighted at Ramenskoye Airport . Missiles were given designations like "TT-5", for

1393-424: A 100-foot (30 m) steel tower. The bomb was driven to the base of the tower, where a temporary eye bolt was screwed into the 105-pound (48 kg) capsule and a chain hoist was used to lower the capsule into the bomb. As the capsule entered the hole in the uranium tamper, it stuck. Robert Bacher realized that the heat from the plutonium core had caused the capsule to expand, while the explosives assembly with

1592-651: A company that normally made boilers for the Navy, Babcock & Wilcox ; they had made something similar and were willing to attempt its manufacture. As delivered in May 1945, Jumbo was 10 feet (3.05 m) in diameter and 25 feet (7.62 m) long with walls 14 inches (356 mm) thick, and weighed 214 short tons (191 long tons; 194 t). A special train brought it from the Babcock & Wilcox plant in Barberton, Ohio , to

1791-629: A compromise whereby the laboratory was operated by the University of California. Financial and procurement activities were the responsibility of the University of California under a 1 January 1943 letter of intent from the OSRD. This was superseded by a formal contract with the Manhattan District on 20 April 1943, which was backdated to 1 January. Financial operations were directed by the resident business officer, J. A. D. Muncy. The intent

1990-437: A controlled reaction were uncertain, and the data obtained would not be as useful as that from a full-scale explosion. Oppenheimer argued that the bomb "must be tested in a range where the energy release is comparable with that contemplated for final use." In March 1944, he obtained Groves's tentative approval for testing a full-scale explosion inside a containment vessel, although Groves was still worried about how he would explain

2189-472: A critical mass. The metal needs to travel only a very short distance, so the critical mass is assembled in much less time than it would take with the gun method. At the time, the idea of using explosives in this manner was quite novel. To facilitate the work, a small plant was established at the Anchor Ranch for casting explosive shapes. Throughout 1943, implosion was considered a backup project in case

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2388-449: A day. The Provisional Engineer Detachment (PED), 4817th Service Command Unit, was activated at Camp Claiborne, Louisiana , on 10 April 1943. These men performed jobs around the post such as working in the boiler plant, the motor pool and the mess halls. They also maintained the buildings and roads. It reached a peak strength of 465 men, and was disbanded on 1 July 1946. The 1st Provisional Women's Army Auxiliary Corps (WAAC) Detachment

2587-468: A fissile "core" by two different high explosives which produced shock waves of different speeds. Alternating the faster- and slower-burning explosives in a carefully calculated configuration would produce a compressive wave upon their simultaneous detonation. This so-called " explosive lens " focused the shock waves inward with sufficient force to rapidly compress the solid plutonium core to several times its original density. The increase in density caused

2786-626: A fission bomb to ignite a nuclear fusion reaction in deuterium and tritium . The Fat Man design was tested in the Trinity nuclear test in July 1945. Project Y personnel formed pit crews and assembly teams for the atomic bombings of Hiroshima and Nagasaki and participated in the bombing as weaponeers and observers. After the war ended, the laboratory supported the Operation Crossroads nuclear tests at Bikini Atoll . A new Z Division

2985-527: A great deal of valuable scientific equipment. Wilson's group dismantled the cyclotron at Harvard University and had it shipped to Los Alamos; McKibben's brought two Van de Graaff generators from Wisconsin; and Manley's brought the Cockcroft–Walton accelerator from the University of Illinois . Communications with the outside world went through a single Forest Service line until April 1943, when it

3184-468: A junior scientist or technician. The Los Alamos Laboratory was reinforced by a British Mission under James Chadwick. The first to arrive were Otto Frisch and Ernest Titterton ; later arrivals included Niels Bohr and his son Aage Bohr , and Sir Geoffrey Taylor , an expert on hydrodynamics who made a major contribution to the understanding of the Rayleigh–Taylor instability . This instability at

3383-754: A lieutenant colonel on 19 January 1943, and was promoted to colonel on 15 February. Los Alamos officially became a military establishment on 1 April 1943, and he moved to Los Alamos on 19 April. He was succeeded by Lieutenant Colonel C. Whitney Ashbridge, a graduate of the Los Alamos Ranch School, in May 1943. In turn, Ashbridge was succeeded by Lieutenant Colonel Gerald R. Tyler in October 1944, Colonel Lyle E. Seaman in November 1945, and Colonel Herb C. Gee in September 1946. The post commander

3582-423: A magazine and commissary. The railroad siding at Pope, New Mexico, was upgraded by adding an unloading platform. Roads were built, and 200 miles (320 km) of telephone wire were strung. Electricity was supplied by portable generators. Bomb shelters to protect test observers were the most expensive to construct. Due to its proximity to the bombing range, the base camp was accidentally bombed twice in May. When

3781-419: A mildly radioactive light green glass, which was named trinitite . The explosion created a crater approximately 4.7 feet (1.4 m) deep and 88 yards (80 m) wide. The radius of the trinitite layer was approximately 330 yards (300 m). The 100-foot shot tower was completely vaporized. At the time of detonation, the surrounding mountains were illuminated "brighter than daytime" for one to two seconds, and

3980-456: A plutonium-239 nucleus absorbing a neutron. What had not been suspected was its high spontaneous fission rate. Segrè's group measured it at 1.6 million fissions per gram per hour, compared with just 40 per gram per hour for plutonium-239. This meant that reactor-bred plutonium was unsuitable for use in a gun-type weapon. The plutonium-240 would start the chain reaction too quickly, causing a predetonation that would release enough energy to disperse

4179-555: A procedure for plutonium purification independent of Seaborg's group. When they got hold of a sample in February, this procedure was tested. That month the Metallurgical Laboratory announced that it had determined that there were two different fluorides: the light colored plutonium tetrafluoride (PuF 4 ) and the dark plutonium trifluoride (PuF 3 ). The chemists soon discovered how to make them selectively, and

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4378-402: A report co-authored with Teller showed that "no self-propagating chain of nuclear reactions is likely to be started". Oppenheimer's deft handling of the July conference impressed his colleagues; his insight and ability to handle even the most difficult people came as a surprise even to those who knew him well. In the wake of the conference, Oppenheimer saw that while they had come to grips with

4577-406: A second set on July 10. Each was examined by Bradbury and Kistiakowsky, and the best ones were selected for use. The remainder were handed over to Edward Creutz , who conducted a test detonation at Pajarito Canyon near Los Alamos without nuclear material. Magnetic measurements from this test suggested that the implosion might be insufficiently simultaneous and the bomb would fail. Bethe worked through

4776-565: A spontaneous fission rate of 40 fissions per gram per hour, which was high but acceptable, the error margin was unacceptably large. In April 1944 they received a sample from the X-10 Graphite Reactor. Tests soon indicated 180 fissions per gram per hour, which was unacceptably high. It fell to Bacher to inform Compton, who was visibly shaken. Suspicion fell on plutonium-240 , an isotope that had not yet been discovered, but whose existence had been suspected, it being simply created by

4975-486: A superintendent, it enjoyed an excellent teacher:pupil ratio. Numerous technical buildings were constructed. Most were of a semi-permanent type, using gypsum board . They were heated from a central heating plant. Initially this was Boiler House No. 1, which had two coal-fired boilers . This was replaced by Boiler House No. 2, which had six oil-fired boilers. In addition to the main site at Los Alamos, some 25 outlying sites were developed for experimental work. The growth of

5174-423: A translucent character, but shortly turned to a tinted or colored white smoke appearance. The ball of fire seemed to rise in something of toadstool effect. Later the column proceeded as a cylinder of white smoke; it seemed to move ponderously. A hole was punched through the clouds, but two fog rings appeared well above the white smoke column. There was a spontaneous cheer from the observers. Dr. von Neumann said, "that

5373-410: A way to recover it. The Laboratory's Governing Board then directed Norman Ramsey to investigate how this could be done. In February 1944, Ramsey proposed a small-scale test in which the explosion was limited in size by reducing the number of generations of chain reactions, and that it take place inside a sealed containment vessel from which the plutonium could be recovered. The means of generating such

5572-539: A wider variety of jobs than the PED; some were cooks, drivers and telephone operators, while others served as librarians, clerks and hospital technicians. Some performed highly specialized scientific research inside the Technical Area. The Special Engineer Detachment (SED) was activated in October 1943 as part of the 9812th Technical Service Unit. It was made up of men with technical skills or advanced education, and

5771-576: Is a synthetic element with complicated properties about which little was known at first, as until 1944 it had been produced only in cyclotrons in very pure microgram amounts, whereas a weapon would require kilogram quantities bred in a reactor. In April 1944, Los Alamos physicist Emilio Segrè discovered that plutonium produced by the X-10 Graphite Reactor at Clinton Engineer Works contained plutonium-240 as an impurity. Plutonium-240 undergoes spontaneous fission at thousands of times

5970-637: Is a means of identification where the official nomenclature is unknown or uncertain. The policy of recognition reporting names was continued into the Cold War for Soviet, other Warsaw Pact , and Communist Chinese aircraft. Although this was started by the Air Standards Co-ordinating Committee (ASCC) formed by the United States, United Kingdom, Canada, Australia, and New Zealand, it was extended throughout NATO as

6169-447: Is to never have to report to anyone that their son "was killed in an operation called 'Bunnyhug' or 'Ballyhoo'." Presently, British forces tend to use one-word names, presumably in keeping with their post-World War II policy of reserving single words for operations and two-word names for exercises. British operation code names are usually randomly generated by a computer and rarely reveal its components or any political implications unlike

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6368-896: The Berkeley Radiation Laboratory , Compton at the Metallurgical Project in Chicago, and Urey at the SAM Laboratories in New York—Oppenheimer did not have a Nobel Prize , raising concerns that he might not have the prestige to deal with distinguished scientists. There were also security concerns; many of Oppenheimer's closest associates were active members of the Communist Party , including his wife Kitty , girlfriend Jean Tatlock , brother Frank , and Frank's wife Jackie. In

6567-600: The Los Alamos Ranch School . The development effort initially focused 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

6766-566: The Manhattan Project on 23 September 1942. He visited Berkeley to look at Lawrence's calutrons , and met with Oppenheimer, who gave him a report on bomb design on 8 October. Groves was interested in Oppenheimer's proposal to establish a separate bomb design laboratory. When they met again in Chicago on October 15, he invited Oppenheimer to discuss the issue. Groves had to catch the 20th Century Limited train back to New York, so he asked Oppenheimer to accompany him so that they could continue

6965-698: The NATO reporting name for aircraft, rockets and missiles. These names were considered by the Soviets as being like a nickname given to one's unit by the opponents in a battle. The Soviets did not like the Sukhoi Su-25 getting the code name " Frogfoot ". However, some names were appropriate, such as "Condor" for the Antonov An-124 , or, most famously, "Fulcrum" for the Mikoyan MiG-29 , which had

7164-723: The National Bureau of Standards . The division was initially organized into five groups, with original group leaders being McMillan of the E-1 (Proving Ground) Group, Kenneth Bainbridge of the E-2 (Instrumentation) Group, Robert Brode of the E-3 (Fuse Development) Group, Critchfield of the E-4 (Projectile, Target, and Source) Group and Neddermeyer of the E-5 (Implosion) Group. Two more groups were added in

7363-677: The National Register of Historic Places the following year. The creation of nuclear weapons arose from the scientific and political developments of the 1930s. The decade saw many new discoveries about the nature of atoms, including the existence of nuclear fission . The concurrent rise of fascist governments in Europe led to a fear of a German nuclear weapon project , especially among scientists who were refugees from Nazi Germany and other fascist countries. When their calculations showed that nuclear weapons were theoretically feasible,

7562-589: The National Safety Council , was made responsible for safety. Captain Samuel P. Davalos, the assistant post engineer at Los Alamos, was placed in charge of construction. First Lieutenant Harold C. Bush became commander of the Base Camp at Trinity. Scientists William Penney , Victor Weisskopf and Philip Moon were consultants. Eventually seven subgroups were formed: The E-9 group was renamed

7761-512: The Rhine ) was deliberately named to suggest the opposite of its purpose – a defensive "watch" as opposed to a massive blitzkrieg operation, just as was Operation Weserübung ( Weser -exercise), which signified the plans to invade Norway and Denmark in April 1940. Britain and the United States developed the security policy of assigning code names intended to give no such clues to

7960-611: The USAAF , invented a system for the identification of Japanese military aircraft. Initially using short, " hillbilly " boys' names such as " Pete ", " Jake ", and " Rufe ", the system was later extended to include girls' names and names of trees and birds, and became widely used by the Allies throughout the Pacific theater of war. This type of naming scheme differs from the other use of code names in that it does not have to be kept secret, but

8159-554: 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, serving from 1943 to December 1945, when he was succeeded by Norris Bradbury . In order to enable scientists to freely discuss their work while preserving security, the laboratory was located on the isolated Pajarito Plateau in Northern New Mexico . The wartime laboratory occupied buildings that had once been part of

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8358-478: The University of California . He not only managed to convince them that an atomic bomb was feasible, but inspired Lawrence to convert his 37-inch (94 cm) cyclotron into a giant mass spectrometer for isotope separation , a technique Oliphant had pioneered in 1934. In turn, Lawrence brought in his friend and colleague Robert Oppenheimer to double-check the physics of the MAUD Committee report, which

8557-708: The University of Wisconsin , Felix Bloch's group from Stanford University and Marshall Holloway 's from Purdue University . He also secured the services of Hans Bethe and Robert Bacher from the Radiation Laboratory at MIT , Edward Teller , Robert F. Christy , Darol K. Froman , Alvin C. Graves and John H. Manley and his group from the Manhattan Project's Metallurgical Laboratory, and Robert R. Wilson and his group, which included Richard Feynman , that had been performing Manhattan Project research at Princeton University . They brought with them

8756-501: The War Department "for so long as the military necessity continues". The need for land for a new road, and later for a right of way for a 25-mile (40 km) power line, eventually brought wartime land purchases to 45,737 acres (18,509.1 ha), but only $ 414,971 was ultimately spent. The big ticket items were the school, which cost $ 350,000, and the Anchor Ranch, which cost $ 25,000. Both hired lawyers to negotiate deals with

8955-515: The bombing of Hiroshima ; the design used in the Trinity test, and eventually used in the bombing of Nagasaki ( Fat Man ), was based on plutonium. The original design considered for a weapon based on plutonium-239 was Thin Man , in which (as in the Little Boy uranium bomb) two subcritical masses of fissile material would be brought rapidly together to form a single critical mass . Plutonium

9154-517: The interface between two fluids of different densities occurs when the lighter fluid is pushing the heavier, and was vital to the interpretation of experiments with explosives, predicting the effects of an explosion, the design of the neutron initiators , and the design of the atomic bomb itself. Chadwick remained only for a few months; he was succeeded as head of the British Mission by Rudolf Peierls. The original idea, favored by Groves,

9353-410: The mean free path of neutrons in the core and tamper were the same. Bethe's T Division, particularly Serber's T-2 (Diffusion Theory) Group and Feynman's T-4 (Diffusion Problems) Groups, would spend the next few months working on improved models. Bethe and Feynman also developed a formula for the efficiency of the reaction. No formula could be more accurate than the values put into it; the values for

9552-498: The 670 workers in the laboratory, hospital and school were women in October 1944. Most worked in administration, but many women such as Lilli Hornig , Jane Hamilton Hall , and Peggy Titterton worked as scientists and technicians. Charlotte Serber headed the A-5 (Library) Group. A large group of women worked on numerical calculations in the T-5 (Computations) Group. Dorothy McKibbin ran

9751-626: The American names (e.g., the 2003 invasion of Iraq was called "Operation Telic" compared to Americans' "Operation Iraqi Freedom", obviously chosen for propaganda rather than secrecy). Americans prefer two-word names, whereas the Canadians and Australians use either. The French military currently prefer names drawn from nature (such as colors or the names of animals), for instance Opération Daguet ("brocket deer") or Opération Baliste ("Triggerfish"). The CIA uses alphabetical prefixes to designate

9950-425: The April 1943 conferences as a means of assembling pieces of fissionable material together to form a critical mass. Neddermeyer took a different tack, attempting to crush a hollow cylinder into a solid bar. The idea was to use explosives to crush a subcritical amount of fissile material into a smaller and denser form. When the fissile atoms are packed closer together, the rate of neutron capture increases, and they form

10149-588: The British and United States governments supported an all-out effort to build them. These efforts were transferred to the authority of the U.S. Army in June 1942 and became the Manhattan Project . Brigadier General Leslie R. Groves, Jr. was appointed its director in September. The weapons development portion of this project was located at the Los Alamos Laboratory in northern New Mexico , under

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10348-559: The Inter Services Security Board (ISSB) staffed by the War Office . This procedure was coordinated with the United States when it entered the war . Random lists of names were issued to users in alphabetical blocks of ten words and were selected as required. Words became available for re-use after six months and unused allocations could be reassigned at discretion and according to need. Judicious selection from

10547-406: The Los Alamos Laboratory soon discovered that it melted at around 635 °C (1,175 °F). The chemists then turned to techniques for removing light element impurities from the plutonium; but on 14 July 1944, Oppenheimer informed Kennedy that this would no longer be required. The notion of spontaneous fission had been raised by Niels Bohr and John Archibald Wheeler in their 1939 treatment of

10746-560: The M. M. Sundt Company of Tucson, Arizona , with work commenced in December 1942. Groves initially allocated $ 300,000 for construction, three times Oppenheimer's estimate, with a planned completion date of 15 March 1943. It soon became clear that the scope of Project Y was far greater than expected, and by the time Sundt finished on 30 November 1943, over $ 7 million had been spent. The Zia Company took over responsibility for maintenance in April 1946. Oppenheimer initially estimated that

10945-502: The MAUD Committee concluded that an atomic bomb was not only feasible, but might be produced as early as 1943. In response, the British government created a nuclear weapons project known as Tube Alloys . There was still little urgency in the United States, which unlike Britain was not yet engaged in World War II , so Oliphant flew there in late August 1941, and spoke to American scientists including his friend Ernest Lawrence at

11144-485: The Manhattan District (the military component of the Manhattan Project) surveyed sites around Gallup , Las Vegas , La Ventana, Jemez Springs , and Otowi , and recommended the one near Jemez Springs. On 16 November, Oppenheimer, Groves, Dudley and others toured the site. Oppenheimer feared that the high cliffs surrounding the site would make people feel claustrophobic, while the engineers were concerned with

11343-545: The Resurrection." That still does not make a Trinity, but in another, better known devotional poem Donne opens: " Batter my heart, three person'd God ." In March 1944, planning for the test was assigned to Kenneth Bainbridge , a professor of physics at Harvard University , working under explosives expert George Kistiakowsky . Bainbridge's group was known as the E-9 (Explosives Development) Group. Stanley Kershaw, formerly from

11542-458: The Santa Fe office, which opened at 109 East Palace Avenue on 27 March 1943. New staff members at the secret Los Alamos site were not given in advance any directions to the site or security credentials. They were told to report to the Santa Fe office, where McKibbin provided them with such things and thereby became the gatekeeper of Los Alamos. The Los Alamos Laboratory had a governing board,

11741-640: The Second World War, the British allocation practice favored one-word code names ( Jubilee , Frankton ). That of the Americans favored longer compound words, although the name Overlord was personally chosen by Winston Churchill himself. Many examples of both types can be cited, as can exceptions. Winston Churchill was particular about the quality of code names. He insisted that code words, especially for dangerous operations, would be not overly grand nor petty nor common. One emotional goal he mentions

11940-715: The Trinity Site to help prepare for the bomb test. They tried to use water out of the ranch wells but found the water so alkaline they could not drink it. They were forced to use U.S. Navy saltwater soap and hauled drinking water in from the firehouse in Socorro. Gasoline and diesel were purchased from the Standard Oil plant there. Freshwater was trucked in, 700 US gallons (2,600 L; 580 imp gal) per load, from 40 miles (64 km) away. Military and civilian construction personnel built warehouses, workshops,

12139-540: The Trinity Test device as that had yet to be developed, but once it was, it became the laboratory code name. The Trinity bomb was officially a Y-1561 device, as was the Fat Man used later in the bombing of Nagasaki. The two were very similar, though the Trinity bomb lacked fuzing and external ballistic casing. The bombs were still under development, and small changes continued to be made to the Fat Man design. To keep

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12338-602: The US (just across the Bering Strait from Nome, Alaska). The names of colors are generally avoided in American practice to avoid confusion with meteorological reporting practices. Britain, in contrast, made deliberately non-meaningful use of them, through the system of rainbow codes . Although German and Italian aircraft were not given code names by their Allied opponents, in 1942, Captain Frank T. McCoy, an intelligence officer of

12537-509: The United States code names are commonly set entirely in upper case. This is not done in other countries, though for the UK in British documents the code name is in upper case while operation is shortened to OP e.g., "Op. TELIC". This presents an opportunity for a bit of public-relations ( Operation Just Cause ), or for controversy over the naming choice (Operation Infinite Justice, renamed Operation Enduring Freedom ). Computers are now used to aid in

12736-561: The United States, beginning in late 1939. Progress was slow in the United States, but in Britain, Otto Frisch and Rudolf Peierls , two refugee physicists from Germany at the University of Birmingham , examined the theoretical issues involved in developing, producing and using atomic bombs. They considered what would happen to a sphere of pure uranium-235, and found that not only could a chain reaction occur, but it might require as little as 1 kilogram (2.2 lb) of uranium-235 to unleash

12935-408: The University of California in Berkeley, in July with theoretical physicists Hans Bethe , John Van Vleck , Edward Teller , Emil Konopinski , Robert Serber, Stan Frankel , and Eldred C. Nelson, the latter three former students of Oppenheimer, and experimental physicists Emilio Segrè , Felix Bloch , Franco Rasetti , John Manley, and Edwin McMillan . They tentatively confirmed that a fission bomb

13134-459: The X-2 (Development, Engineering and Tests) Group in the August 1944 reorganization. Safety and security required a remote, isolated and unpopulated area. The scientists also wanted a flat area to minimize secondary effects of the blast, and with little wind to spread radioactive fallout . Eight candidate sites were considered: the Tularosa Valley ; the Jornada del Muerto Valley ; the area southwest of Cuba, New Mexico , and north of Thoreau ; and

13333-423: The active material could be chemically recovered after a contained or failed explosion. Because there would be only one chance to carry out the test correctly, Bainbridge decided that a rehearsal should be carried out to allow the plans and procedures to be verified, and the instrumentation to be tested and calibrated. Oppenheimer was initially skeptical but gave permission, and he later agreed that it contributed to

13532-437: The area. The site acquired an irregular shape due to abutting the Bandelier National Monument and a Native American sacred burial ground. An important consideration in the acquisition of the site was the existence of the Los Alamos Ranch School. This consisted of 54 buildings, of which 27 were houses, dormitories or other quarters providing 46,626 square feet (4,331.7 m ) of accommodation. The remaining buildings included

13731-462: The atmosphere would ignite, and if so whether it would destroy just the state or incinerate the entire planet. This last result had been previously calculated by Bethe to be almost impossible, although for a while it had caused some of the scientists some anxiety. Bainbridge was furious with Fermi for frightening the guards, some of whom asked to be relieved; his own biggest fear was that nothing at all would happen, in which case he would have to return to

13930-522: The atomic missions. These included Captain Deak Parsons , the associate director of the Los Alamos Laboratory and the head of Project Alberta; Luis Alvarez , Harold Agnew , Bernard Waldman , Wolfgang Panofsky , and William Penney . The overcast sky obscured their view of the test site. At 05:29:21 MWT (11:29:21 GMT ) ± 15 seconds, the device exploded with an energy equivalent to 24.8 ± 2 kilotons of TNT (103.8 ± 8.4 TJ). The desert sand, largely made of silica , melted and became

14129-423: The autumn of 1943, the E-7 (Delivery) Group under Norman Ramsey and the E-8 (Interior Ballistics) Group under Joseph O. Hirschfelder . A proving ground was established at the Anchor Ranch. The gun would be an unusual one, and it had to be designed in the absence of crucial data about the critical mass. The design criteria were that the gun would have a muzzle velocity of 3,000 feet per second (910 m/s); that

14328-616: The available accommodation and personnel were temporarily lodged in Frijoles Canyon. The houses at Clinton Engineer Works in Oak Ridge, Tennessee and Hanford Engineer Works in Washington state were basic but of a higher standard (as specified by Nichols ) than the houses at Los Alamos (as specified by Groves ), but Nichols said to Los Alamos scientists that housing there was Groves' problem not his. Rents were set based on

14527-403: The available allocation could result in clever meanings and result in an aptronym or backronym , although policy was to select words that had no obviously deducible connection with what they were supposed to be concealing. Those for the major conference meetings had a partial naming sequence referring to devices or instruments which had a number as part of their meaning, e.g., the third meeting

14726-514: The chairman of the National Defense Research Committee (NDRC). On 19 October, Groves approved the establishment of a bomb laboratory. While Oppenheimer seemed the logical person to direct the new laboratory, which became known as Project Y, he had little administrative experience; Bush, Conant, Lawrence and Harold Urey all expressed reservations about this. Moreover, unlike his other project leaders—Lawrence at

14925-704: The commander of the Second Air Force on September 7, 1944, lay at the northern end of the Alamogordo Bombing Range , in Socorro County near the towns of Carrizozo and San Antonio ( 33°40.636′N 106°28.525′W  /  33.677267°N 106.475417°W  / 33.677267; -106.475417 ). The Alamogordo Bombing Range was renamed the White Sands Proving Ground on July 9, 1945, one week before

15124-489: The complex Fat Man design would work led to a decision to conduct the first nuclear test . The code name "Trinity" was assigned by J. Robert Oppenheimer , the director of the Los Alamos Laboratory , possibly inspired by the poetry of John Donne . The test, both planned and directed by Kenneth Bainbridge , was conducted in the Jornada del Muerto desert about 35 miles (56 km) southeast of Socorro, New Mexico , on what

15323-635: The conventional gun. Nor did it require rifling or recoil mechanisms. Pressure curves were computed under Hirschfelder's supervision at the Geophysical Laboratory prior to his joining the Los Alamos Laboratory. While they waited for the guns to be fabricated by the Naval Gun Factory , various propellants were tested. Hirschfelder sent John L. Magee to the Bureau of Mines ' Experimental Mine at Bruceton, Pennsylvania to test

15522-415: The core in the natural uranium tamper plug, or "slug". Air gaps were filled with 0.5-mil (0.013 mm) gold foil, and the two halves of the plug were held together with uranium washers and screws which fit smoothly into the domed ends of the plug. To better understand the likely effect of a bomb dropped from a plane and detonated in air, and generate less nuclear fallout, the bomb was to be detonated atop

15721-478: The core – previously subcritical – to become supercritical. At the same time, the shock wave activated a small neutron source at the center of the core, thereby assuring that the chain reaction would begin in earnest immediately at the moment of compression. Such a complicated design required substantial research and experimentation in engineering and hydrodynamics , and in August 1944

15920-402: The country. Oppenheimer and Robert Serber of the University of Illinois examined the problems of neutron diffusion—how neutrons moved in a nuclear chain reaction—and hydrodynamics —how the explosion produced by a chain reaction might behave. To review this work and the general theory of fission reactions, Oppenheimer and Fermi convened meetings at the University of Chicago in June and at

16119-427: The critical mass before enough plutonium reacted. A faster gun was suggested but found to be impractical. So too was the possibility of separating the isotopes, as plutonium-240 is even harder to separate from plutonium-239 than uranium-235 from uranium-238. Work on an alternative method of bomb design, known as implosion, had begun by Neddermeyer's E-5 (Implosion) group. Serber and Tolman had conceived implosion during

16318-428: The cross sections were dubious, and had not yet been determined for plutonium. Measurement of these values would be a priority, but the laboratory possessed just 1 gram of uranium-235, and only a few micrograms of plutonium. This task fell to Bacher's P Division. Williams P-2 (Electrostatic Generator) Group carried out the first experiment in July 1943, when it used the larger of the two Van de Graaff generators to measure

16517-512: The damage could be increased if the bomb was detonated at an altitude comparable to the damage radius, approximately 1 to 2 kilometers (3,300 to 6,600 ft). Parsons was appointed the head of Ordnance and Engineering Division in June 1943 on the recommendation of Bush and Conant. To staff the division, Tolman, who acted as a coordinator of the gun development effort, brought in John Streib, Charles Critchfield and Seth Neddermeyer from

16716-416: The design as simple as possible, a nearly solid spherical core was chosen rather than a hollow one, although calculations showed that a hollow core would be more efficient in its use of plutonium. The core was compressed to prompt super-criticality by the implosion generated by the high explosive lens. This design became known as a "Christy Core" or " Christy pit " after physicist Robert F. Christy , who made

16915-439: The design of a containment vessel for an unsuccessful explosion, known as "Jumbo", was assigned to Robert W. Henderson and Roy W. Carlson of the Los Alamos Laboratory's X-2A Section. The bomb would be placed into the heart of Jumbo, and if the bomb's detonation was unsuccessful the walls of Jumbo would not be breached, making it possible to recover the bomb's plutonium. Hans Bethe , Victor Weisskopf, and Joseph O. Hirschfelder made

17114-504: The directorship of physicist J. Robert Oppenheimer . The University of Chicago , Columbia University and the Radiation Laboratory at the University of California, Berkeley conducted other development work. Manhattan Project scientists had identified two fissile isotopes for potential use in bombs: uranium-235 and plutonium-239 . Uranium-235 became the basis of the Little Boy bomb design, first used (without prior testing) in

17313-410: The discussion. Groves, Oppenheimer, Colonel James C. Marshall , and Lieutenant Colonel Kenneth Nichols all squeezed into Nichol's single roomette compartment to discuss how a bomb laboratory could be created and how it would function. Groves subsequently had Oppenheimer come to Washington, D.C. , where the matter was discussed with Vannevar Bush , the director of the OSRD, and James B. Conant ,

17512-478: The divisions expanded during 1943 and 1944, but T Division, despite trebling in size, remained the smallest, while E Division grew to be the largest. Security clearance was a problem. Scientists (including, at first, Oppenheimer) had to be given access to the Technical Area without proper clearance. In the interest of efficiency, Groves approved an abbreviated process by which Oppenheimer vouched for senior scientists, and three other employees were sufficient to vouch for

17711-477: The efficiency of the bomb as it exploded. Considering the idea of the fission bomb theoretically settled—at least until more experimental data was available—the Berkeley conference then turned in a different direction. Edward Teller pushed for discussion of a more powerful bomb: the "Super", usually referred to today as a " hydrogen bomb ", which would use the explosive force of a detonating fission bomb to ignite

17910-460: The elements tested except for plutonium, which they were unable to measure accurately enough because the only sample they had was five 20 μg samples created by the 60-inch cyclotron at Berkeley. They did observe that measurements taken at Los Alamos were greater than those made at Berkeley, which they attributed to cosmic rays , which are more numerous at Los Alamos, which is 7,300 feet (2,200 m) above sea level. While their measurements indicated

18109-407: The end of 1946, except for Titterton, who was granted a special dispensation, and remained until 12 April 1947. The British Mission ended when he departed. In 1943, development efforts were directed to a gun-type fission weapon using plutonium called Thin Man . The names for all three atomic bomb designs— Fat Man , Thin Man, and Little Boy —were chosen by Serber based on their shapes. Thin Man

18308-598: The end, Groves personally issued instructions to clear Oppenheimer on 20 July 1943. The idea of locating Project Y at the Metallurgical Laboratory in Chicago, or the Clinton Engineer Works in Oak Ridge, Tennessee , was considered, but in the end it was decided that a remote location would be best. A site in the vicinity of Los Angeles was rejected on security grounds, and one near Reno, Nevada as being too inaccessible. On Oppenheimer's recommendation,

18507-718: The energy of hundreds of tons of TNT . Their superior, Mark Oliphant , took the Frisch–Peierls memorandum to Sir Henry Tizard , the chairman of the Committee for the Scientific Survey of Air Warfare (CSSAW), who in turn passed it on to George Paget Thomson , to whom the CSSAW had delegated responsibility for uranium research. CSSAW created the MAUD Committee to investigate. In its final report in July 1941,

18706-473: The entire Los Alamos Laboratory was reorganized to focus on this work. The idea of testing the implosion device was brought up in discussions at Los Alamos in January 1944 and attracted enough support for Oppenheimer to approach Groves. Groves gave approval, but he had concerns. The Manhattan Project had spent a great deal of money and effort to produce the plutonium, and he wanted to know whether there would be

18905-475: The exacting purity requirement could be met. Only microscopic quantities of plutonium were available until the X-10 Graphite Reactor at the Clinton Engineer Works came online on 4 November 1943, but there were already some worrying signs. When plutonium fluoride was produced at the Metallurgical Laboratory, it was sometimes light colored, and sometimes dark, although the chemical process

19104-457: The explosion. Conant wrote, "The enormity of the light and its length quite stunned me". Lawrence, 27 miles (43 km) away, wrote of being "enveloped with a warm brilliant yellow white light—from darkness to brilliant sunshine in an instant". Ralph Carlisle Smith, watching from Compania Hill, wrote: I was staring straight ahead with my open left eye covered by a welder's glass and my right eye remaining open and uncovered. Suddenly, my right eye

19303-410: The explosive energy of 25 kilotons of TNT (100  TJ ) ± 2 kilotons of TNT (8.4  TJ ), and a large cloud of fallout . Thousands of people lived closer to the test than would have been allowed under guidelines adopted for subsequent tests, but no one living near the test was evacuated before or afterward. The test site was declared a National Historic Landmark district in 1965 and listed on

19502-810: The fifth rocket seen at Tyura-Tam . When more information resulted in knowing a bit about what a missile was used for, it would be given a designation like "SS-6", for the sixth surface-to-surface missile design reported. Finally, when either an aircraft or a missile was able to be photographed with a hand-held camera, instead of a reconnaissance aircraft, it was given a name like " Flanker " or " Scud " – always an English word, as international pilots worldwide are required to learn English. The Soviet manufacturer or designation – which may be mistakenly inferred by NATO – has nothing to do with it. Jet-powered aircraft received two-syllable names like Foxbat , while propeller aircraft were designated with short names like Bull . Fighter names began with an "F", bombers with

19701-440: The fissile material into a critical mass. The simplest was shooting a "cylindrical plug" into a sphere of "active material" with a " tamper "—dense material that would focus neutrons inward and keep the reacting mass together to increase its efficiency. They also explored designs involving spheroids , a primitive form of "implosion" suggested by Richard C. Tolman , and the possibility of autocatalytic methods , which would increase

19900-555: The former turned out to be easier to reduce to metal. Measurements in March 1944 indicated a density of between 19 and 20 g/cm . Eric Jette's CM-8 (Plutonium Metallurgy) Group began experimenting with plutonium metal after gram quantities were received at the Los Alamos Laboratory in March 1944. By heating it, the metallurgists discovered five temperatures between 137 and 580 °C (279 and 1,076 °F) at which it suddenly started absorbing heat without increasing in temperature. This

20099-538: The fusing systems, testing radar altimeters , proximity fuses and barometric altimeter fuses. Tests were conducted with a frequency modulated type radar altimeter known as AYD and a pulse type known as 718. The AYD modifications were made by the Norden Laboratories Corporation under an OSRD contract. When the manufacturer of 718, RCA , was contacted, it was learned that a new tail warning radar , AN/APS-13 , later nicknamed Archie ,

20298-492: The government, but Hispanic homesteaders were paid as little as $ 7 an acre (equivalent to $ 123 in 2023). Grazing permits were withdrawn, and private land was purchased or condemned under eminent domain using the authority of the Second War Powers Act . Petitions of condemnation were worded to cover all mineral, water, timber and other rights, so private individuals would have no reason whatsoever to enter

20497-523: The ground, with concrete footings. Atop it was an oak platform and a corrugated iron shack open to the west. The gadget was hauled up with an electric winch. A truckload of mattresses was placed underneath in case the cable broke and the gadget fell. A crew then attached each of the 32 Model 1773 EBW detonators. Full assembly of the bomb was completed by 17:00 on July 14. The seven-man arming party, consisting of Bainbridge, Kistiakowsky, Joseph McKibben and four soldiers including Lieutenant Bush, drove out to

20696-416: The gun-type proved impractical for some reason. Theoretical physicists like Bethe, Oppenheimer and Teller were intrigued by the idea of a design of an atomic bomb that made more efficient use of fissile material, and permitted the use of material of lower purity. These were advantages of particular attraction to Groves. But while Neddermeyer's 1943 and early 1944 investigations into implosion showed promise, it

20895-406: The heat was reported as "being as hot as an oven" at the base camp. The observed colors of the illumination changed from purple to green and eventually to white. The roar of the shock wave took 40 seconds to reach the observers. It was felt over 100 miles (160 km) away, and the mushroom cloud reached 7.5 miles (12.1 km) in height. Many observers recalled their amazement at the light from

21094-629: The income of the occupant. Transient visitors to Los Alamos were accommodated in the Fuller Lodge , the Guest Cottage or the Big House, which had once been part of the Los Alamos Ranch School. A school was established in 1943, catering for both grade school and high school, and 140 children were enrolled; 350 by 1946. Education was free, as was a nursery school for working mothers. With 18 grade-school teachers, 13 high-school teachers, and

21293-481: The initial calculations, followed by a more detailed analysis by Henderson and Carlson. They drew up specifications for a steel sphere 13 to 15 feet (3.96 to 4.57 m) in diameter, weighing 150 short tons (140 t) and capable of handling a pressure of 50,000 pounds per square inch (340,000 kPa). After consulting with the steel companies and the railroads, Carlson produced a scaled-back cylindrical design that would be much easier to manufacture. Carlson identified

21492-499: The laboratory's plan for the rest of the year. Oppenheimer estimated the critical mass of a uranium-235 gadget with a formula based on diffusion theory derived at Berkeley by Stan Frankel and E. C. Nelson. This gave a value for a uranium-235 gadget with a perfect tamper of 25 kg; but this was only an approximation. It was based on simplifying assumptions, notably that all neutrons had the same speed, that all collisions were elastic , that they were scattered isotropically , and that

21691-518: 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 that was the third reactor in the world to become operational. It also researched the Super, a hydrogen bomb that would use

21890-964: The lava flats of the El Malpais National Monument , all in New Mexico; the San Luis Valley near the Great Sand Dunes National Monument in Colorado; the Desert Training Area and San Nicolas Island in Southern California; and the sand bars of Padre Island , Texas. The sites were surveyed by car and by air by Bainbridge, R. W. Henderson, Major W. A. Stevens and Major Peer de Silva . The site finally chosen, after consulting with Major General Uzal Ent ,

22089-405: The lead plane on a practice night raid accidentally knocked out the generator or otherwise doused the lights illuminating their target, they went in search of the lights, and since they had not been informed of the presence of the Trinity base camp, and it was lit, they bombed it instead. The accidental bombing damaged the stables and the carpentry shop, and a small fire resulted. Responsibility for

22288-459: The loss of "a billion dollars worth" of plutonium in the event the test failed. The origin of the code name "Trinity" for the test is unknown, but it is often attributed to Oppenheimer as a reference to the poetry of John Donne , which in turn references the Christian belief of the Trinity . In 1962, Groves wrote to Oppenheimer about the origin of the name, asking if he had chosen it because it

22487-726: The mechanism of nuclear fission. The first attempt to discover spontaneous fission in uranium was made by Willard Libby , but he failed to detect it. It had been observed in Britain by Frisch and Titterton, and independently in the Soviet Union by Georgy Flyorov and Konstantin Petrzhak in 1940; the latter are generally credited with the discovery. Compton had also heard from the French physicist Pierre Auger that Frédéric Joliot-Curie had detected what might have been spontaneous fission in polonium . If true, it might preclude

22686-466: The members of which were Oppenheimer, Bacher, Bethe, Kennedy, D. L. Hughes (Personnel Director), D. P. Mitchell (Procurement Director) and Deak Parsons. McMillan, George Kistiakowsky and Kenneth Bainbridge were later added. The laboratory was organized into five divisions: Administration (A), Theoretical (T) under Bethe, Experimental Physics (P) under Bacher, Chemistry and Metallurgy (CM) under Kennedy, and Ordnance and Engineering (E) under Parsons. All

22885-399: The middle, had been designed to contain the 5,000 lbs of high explosive in the atomic bomb while it was suspended in the center of the vessel. With the conventional bombs placed in the bottom of Jumbo, the resulting blast sent fragments flying in all directions as far as three quarters of a mile. Who authorized the destruction of Jumbo remains controversial. The rusting skeleton of Jumbo sits in

23084-552: The month before, and the latter had calculated that neutron emitters like boron had to be restricted to one part in a hundred billion. There was some doubt about whether a chemical process could be developed that could ensure this level of purity, and Chadwick brought the matter to the S-1 Executive Committee's attention for it to be considered further. Four days later, though, Lawrence, Oppenheimer, Compton and McMillan reported to Conant that they had confidence that

23283-488: The next most desirable accommodation was the apartments built by Sundt. A typical two-storey building held four families. Each Sundt apartment had two or three bedrooms, a kitchen with a cranky black coal stove, and a small bathroom. J. E. Morgan and Sons supplied 56 prefabricated dwellings that became known as "Morganville". The Robert E. McKee Company built a part of the town known as "McKeeville". In June through October 1943, and again in June and July 1944, numbers outstripped

23482-474: The night to assess the results and reported that they were consistent with a perfect explosion. Assembly of the nuclear capsule began on July 13 at the McDonald Ranch House, where the master bedroom had been turned into a clean room . The polonium-beryllium "Urchin" initiator was assembled, and Louis Slotin placed it inside the two hemispheres of the plutonium core. Cyril Smith then placed

23681-549: The number of dependents increased. This trend accelerated with the end of the war and the replacement of military personnel with civilians with families. Due to the highly classified nature of the work, no census of the population of Los Alamos was conducted until April 1946. Birth certificates of babies born in Los Alamos during the war listed their place of birth as PO Box 1663 in Santa Fe. All letters and packages came through that address. The most desirable accommodation were

23880-407: The observation plane, a Boeing B-29 Superfortress from the 216th Army Air Forces Base Unit flown by Major Clyde "Stan" Shields, to get into position. The fireball of the conventional explosion was visible from Alamogordo Army Air Field 60 miles (100 km) away, but there was little shock at the base camp 10 miles (16 km) away. Shields thought that the explosion looked "beautiful", but it

24079-471: The official name of the final product, a practice that was started in 2002 with Mac OS X v10.2 "Jaguar". Google and the AOSP also used this for their Android operating system until 2013, where the code name was different from the release name. Los Alamos Laboratory The Los Alamos Laboratory , also known as Project Y , was a secret laboratory established by the Manhattan Project and operated by

24278-402: The others. Ramsey chose zero (a complete dud ), Robert Oppenheimer chose 0.3 kilotons of TNT (1.3 TJ), Kistiakowsky 1.4 kilotons of TNT (5.9 TJ), and Bethe chose 8 kilotons of TNT (33 TJ). Rabi, the last to arrive, took the only remaining choice – 18 kilotons of TNT (75 TJ), which turned out to be the winner. Bethe later stated that his choice of 8 kt was exactly

24477-544: The parking lot at the Trinity site on the White Sands Missile Range, where it was moved in 1979. The development team also considered other methods of recovering active material in the event of a dud explosion. One idea was to cover it with a cone of sand. Another was to suspend the bomb in a tank of water. As with Jumbo, it was decided not to proceed with these means of containment. The CM-10 (Chemistry and Metallurgy) group at Los Alamos also studied how

24676-507: The part of the agency supporting an operation. In many cases with the United States, the first word of the name has to do with the intent of the program. Programs with "have" as the first word, such as Have Blue for the stealth fighter development, are developmental programs, not meant to produce a production aircraft. Programs that start with Senior, such as Senior Trend for the F-117, are for aircraft in testing meant to enter production. In

24875-407: The peak pressure, which depends on the cube root of its energy. Bethe then calculated that a 10 kilotonnes of TNT (42 TJ) explosion would result in an overpressure of 0.1 standard atmospheres (10 kPa) at 3.5 kilometers (2.2 mi), and therefore result in severe damage within that radius. Von Neumann also suggested that, because pressure increases when shock waves bounce off solid objects,

25074-485: The physics, considerable work was still required on the engineering, chemistry, metallurgy and ordnance aspects of building an atomic bomb. He became convinced that bomb design would require an environment where people could freely discuss problems and thereby reduce wasteful duplication of effort. He reasoned that this could best be reconciled with security by creating a central laboratory in an isolated location. Brigadier General Leslie R. Groves Jr. became director of

25273-509: The plutonium itself; their main concern was the issue Chadwick had raised about interaction with light element impurities. Segrè and his group of young physicists set up their experiment in an old Forest Service log cabin in Pajarito Canyon, about 14 miles (23 km) from the Technical Area, in order to minimize background radiation emanating for other research at the Los Alamos Laboratory. By August 1943, they had good values for all

25472-527: The possibility of a controlled nuclear chain reaction using uranium . At the time, few scientists in the United States thought that an atomic bomb was practical, but the possibility that a German atomic bomb project would develop atomic weapons concerned refugee scientists from Nazi Germany and other fascist countries, leading to the drafting of the Einstein–Szilard letter to warn President Franklin D. Roosevelt . This prompted preliminary research in

25671-511: The possibility of flooding. The party then moved on to the Otowi site, the vicinity of the Los Alamos Ranch School . Oppenheimer was impressed by and expressed a strong preference for the site, citing its natural beauty and views of the Sangre de Cristo Mountains , which, he hoped, would inspire those who would work on the project. The engineers were concerned about the poor access road, and whether

25870-684: The propellant and ignition system. Test firing was conducted at the Anchor Ranch with a 3-inch (76 mm)/50 caliber gun . This allowed the fine-tuning of the testing instrumentation. The first two tubes arrived at Los Alamos on 10 March 1944, and test firing began at the Anchor Ranch under the direction of Thomas H. Olmstead, who had experience in such work at the Naval Proving Ground in Dahlgren, Virginia . The primers were tested and found to work at pressures up to 80,000 pounds per square inch (550,000 kPa). Brode's group investigated

26069-635: The rain had gone. There were some communication problems: the shortwave radio frequency for communicating with the B-29s was shared with the Voice of America , and the FM radios shared a frequency with a railroad freight yard in San Antonio , Texas. Two circling B-29s observed the test, with Shields again flying the lead plane. They carried members of Project Alberta who would carry out airborne measurements during

26268-482: The rate of plutonium-239, and the extra neutrons thereby released made it likely that plutonium in a gun-type fission weapon would detonate too soon after a critical mass was formed, producing a " fizzle "—a nuclear explosion many times smaller than a full explosion. The Thin Man design would therefore not work. Project scientists then turned to a more technically difficult implosion design . In September 1943, mathematician John von Neumann had proposed surrounding

26467-453: The ratio of the neutron per fission in plutonium against that of uranium-235. This involved some negotiation with the Metallurgical Laboratory to obtain 165 μg of plutonium, which was received at Los Alamos on 10 July 1943. Bacher was able to report that the number of neutrons per fission of plutonium-239 was 2.64 ± 0.2, about 1.2 times as much as uranium-235. Titterton and Boyce McDaniel of Wilson's P-1 (Cyclotron) Group attempted to measure

26666-420: The rehearsal test revealed practical concerns as well. Over 100 vehicles were used for the rehearsal test, but it was realized more would be required for the main test, and they would need better roads and repair facilities. More radios and more telephone lines were required. Lines needed to be buried to prevent damage by vehicles. A teletype was installed to allow better communication with Los Alamos. A town hall

26865-468: The residents of Los Alamos became fully-fledged citizens of New Mexico on 10 June 1949. Initially Los Alamos was to have been a military laboratory with Oppenheimer and other researchers commissioned into the Army. Oppenheimer went so far as to order himself a lieutenant colonel's uniform, but two key physicists, Robert Bacher and Isidor Rabi , balked at the idea. Conant, Groves and Oppenheimer then devised

27064-422: The scientists concerned about a premature detonation, as had happened with a model of the electrical system. A crucial favorable weather report came in at 04:45, and the final twenty-minute countdown began at 05:10, read by Samuel Allison . A rocket launched at 5:25 to signal five minutes before detonation; another rocket fired at 5:29. At 5:29:15, a switch in the control bunker started the detonation timer. By 05:30

27263-462: The search was narrowed to the vicinity of Albuquerque, New Mexico , where Oppenheimer owned a ranch in the Sangre de Cristo Range . The climate was mild, there were air and rail connections to Albuquerque, it was sufficiently distant from the West Coast of the United States for a Japanese attack not to be an issue, and the population density was low. In October 1942, Major John H. Dudley of

27462-452: The selection. And further, there is a distinction between the secret names during former wars and the published names of recent ones. A project code name is a code name (usually a single word, short phrase or acronym) which is given to a project being developed by industry , academia , government, and other concerns. Project code names are typically used for several reasons: Different organizations have different policies regarding

27661-605: The siding at Pope, where it was loaded on a large trailer and towed 25 miles (40 km) across the desert by crawler tractors . At the time, it was the heaviest item ever shipped by rail. For many of the Los Alamos scientists, Jumbo was "the physical manifestation of the lowest point in the Laboratory's hopes for the success of an implosion bomb." By the time it arrived, the reactors at the Hanford Engineer Works produced plutonium in quantity, and Oppenheimer

27860-404: The silver plating developed blisters that had to be filed down and covered with gold foil; later cores were plated with nickel instead. A trial assembly of the bomb, without active components or explosive lenses, was carried out by the bomb assembly team headed by Norris Bradbury at Los Alamos on July 3. It was driven to Trinity and back. A set of explosive lenses arrived on July 7, followed by

28059-481: The site proved too great for the horses, so they were repurposed for polo playing, and the MPs resorted to using jeeps and trucks for transportation. Maintenance of morale among men working long hours under harsh conditions along with dangerous reptiles and insects was a challenge. Bush strove to improve the food and accommodation and to provide organized games and nightly movies. Throughout 1945, other personnel arrived at

28258-553: The six existing log and stone cottages that had once housed the headmaster and the Los Alamos Ranch School faculty. They were the only dwellings at Los Alamos that had bathtubs, and became known as "Bathtub Row". Oppenheimer lived on Bathtub Row; his next-door neighbor was Captain W. S. "Deak" Parsons , the head of the Ordnance and Engineering Division. Parsons' house was slightly larger, because Parsons had two children and Oppenheimer, at that point, had only one. After Bathtub Row,

28457-527: The solid pit design a reality after it was initially proposed by Edward Teller . Of the several allotropes of plutonium , the metallurgists preferred the malleable δ ( delta ) phase . This was stabilized at room temperature by alloying it with gallium . Two equal hemispheres of plutonium-gallium alloy were plated with silver, and designated by serial numbers HS-1 and HS-2. The 6.19-kilogram (13.6 lb) radioactive core generated 15 W of heat, which warmed it up to about 100 to 110 °F (38 to 43 °C), and

28656-482: The southeast. Like the rest of the Alamogordo Bombing Range, it had been acquired by the government in 1942. The patented land had been condemned and grazing rights suspended. Scientists used this as a laboratory for testing bomb components. Bainbridge and Davalos drew up plans for a base camp with accommodation and facilities for 160 personnel, along with the technical infrastructure to support

28855-400: The success of the Trinity test. A 20-foot-high (6 m) wooden platform was constructed 800 yards (730 m) to the southeast of Trinity ground zero . The high explosive was piled in its wooden shipping boxes in the shape of a pseudo-octagonal prism on it. The charge consisted of 89.75 short tons (81.42 t) tons of TNT and 14.91 short tons (13.53 t) tons of Composition B (with

29054-491: The supply completely. Residents had to draw water from 15 tanker trucks that carried 300,000 US gallons (1,100,000 L) per day. Because its name was secret, Los Alamos was referred to as "Site Y"; to residents it was known as "The Hill". Because they lived on Federal land, the state of New Mexico did not allow residents of Los Alamos to vote in elections, although it did require them to pay state income taxes. A drawn-out series of legal and legislative battles lay ahead before

29253-464: The surrounding region should that prove necessary. They had enough vehicles to move 450 people to safety and had food and supplies to last them for two days. Arrangements were made for Alamogordo Army Air Field to provide accommodation. Groves warned Governor of New Mexico John J. Dempsey that martial law might have to be declared in the southwestern part of the state. Shelters were established 10,000 yards (9,100 m) due north, west, and south of

29452-404: The tamper had cooled during the night in the desert. By leaving the capsule in contact with the tamper, the temperatures equalized and, in a few minutes, the capsule had slipped completely into the tamper. The eye bolt was then removed from the capsule and replaced with a threaded uranium plug, a boron disk was placed on top of the capsule (to complete the thin spherical shell of plastic boron around

29651-437: The tamper), an aluminum plug was screwed into the hole in the pusher (aluminum shell surrounding the tamper), and the two remaining high explosive lenses were installed. Finally, the upper Dural polar cap was bolted into place. The assembly of active material and high explosives was finished at 17:45 hours on 13 July. The gadget was hoisted to the top of the tower. The tower stood on four legs extending 20 feet (6.1 m) into

29850-455: The test from Compania Hill (also called Compaña Hill or Cerro de la Colorado), about 20 miles (32 km) northwest of the tower. Photographic film was placed in nearby towns to detect radioactive contamination, and seismographs were placed in Tucson , Denver , and Chihuahua, Mexico to determine how far the explosion could be sensed. The observers set up a betting pool on the results of

30049-459: The test. A construction firm from Lubbock, Texas , built the barracks, officers' quarters, mess hall and other basic facilities. The requirements expanded and by July 1945 250 people worked at the Trinity test site. On the weekend of the test, there were 425 present. Lieutenant Bush's twelve-man MP unit arrived at the site from Los Alamos on December 30, 1944. This unit established initial security checkpoints and horse patrols. The distances around

30248-533: The test. Despite the criterion that the site be isolated, nearly half a million people lived within 150 miles (240 km) of the test site; soon after the Trinity test, the Manhattan Project's chief medical officer, Colonel Stafford L. Warren , recommended that future tests be conducted at least 150 miles from populated areas. The only structures in the vicinity were the McDonald Ranch House and its ancillary buildings, about 2 miles (3.2 km) to

30447-415: The test. Teller was the most optimistic, predicting 45 kilotons of TNT (190 TJ). He wore gloves to protect his hands and sunglasses underneath the welding goggles that the government had supplied everyone with. He was one of the few scientists to watch the test (with eye protection), instead of following orders to lie on the ground with his back turned. He also brought suntan lotion, which he shared with

30646-402: The time it took for prompt neutrons to be emitted from a uranium-235 nucleus when it fissions. They calculated that most were emitted in less than 1 nanosecond . Subsequent experiments demonstrated that fission took less than a nanosecond too. Confirmation of the theorists' contention that the number of neutrons emitted per fission was the same for both fast and slow neutrons took longer, and

30845-524: The total explosive power of approximately 108 tons of TNT (450 GJ)), actually a few tons more than the stated "100-tons". Kistiakowsky assured Bainbridge that the explosives used were not susceptible to shock. This was proven correct when some boxes fell off the elevator lifting them up to the platform. Flexible tubing was threaded through the pile of boxes of explosives. A radioactive slug from Hanford with 1,000 curies (37  TBq ) of beta ray activity and 400 curies (15 TBq) of gamma ray activity

31044-482: The tower to investigate. Mary Argo was the only female staff member to be officially invited to watch the test, which she did. Joan Hinton snuck in to watch the test despite not being invited. The scientists wanted good visibility, low humidity, light winds at low altitude, and westerly winds at high altitude for the test. The best weather was predicted between July 18 and 21, but the Potsdam Conference

31243-400: The tower to perform the final arming shortly after 22:00 on July 15. In the final two weeks before the test, some 250 personnel from Los Alamos were at work at the Trinity Site, and Lieutenant Bush's command had ballooned to 125 men guarding and maintaining the base camp. Another 160 men under Major T.O. Palmer were stationed outside the area with vehicles to evacuate the civilian population in

31442-737: The tower, each with its own chief: Robert Wilson at N-10,000, John Manley at W-10,000 and Frank Oppenheimer at S-10,000. Many other observers were around 20 miles (32 km) away, and some others were scattered at different distances, some in more informal situations. Richard Feynman claimed to be the only person to see the explosion without the goggles provided, relying on a truck windshield to screen out harmful ultraviolet wavelengths. Bainbridge asked Groves to keep his VIP list down to ten. He chose himself, Oppenheimer, Richard Tolman , Vannevar Bush , James Conant , Brigadier General Thomas F. Farrell , Charles Lauritsen , Isidor Isaac Rabi , Sir Geoffrey Taylor , and Sir James Chadwick . The VIPs viewed

31641-437: The town outpaced the sewage system, and by late 1945 there were electrical outages. Lights had to be shut off during the day, and between 7 and 10 pm. Water also ran short. During the autumn of 1945, consumption was 585,000 US gallons (2,210,000 L) per day, but the water supply could furnish only 475,000 US gallons (1,800,000 L). On 19 December, pipes that had been laid above ground to save time in 1943 froze, cutting off

31840-516: The township for emergencies. Since there was no way to prevent the lines being tapped, classified information could not be discussed over the phone lines. Initially the phone lines were operable only during business hours until enough WACs arrived to staff the switchboard around the clock. Women at Los Alamos were encouraged to work, due to the shortage of labor and security concerns over bringing in local workers. About 60 wives of scientists were at work in Technical Area by September 1943. About 200 of

32039-431: The tube would weigh only 1 short ton (0.91 t) instead of the conventional 5 short tons (4.5 t) for a tube with that energy; that, as a consequence it would be made of alloyed steel; that it should have a maximum breech pressure of 75,000 pounds per square inch (520,000  kPa ); and that it should have three independent primers . Because it would need to be fired only once, the barrel could be made lighter than

32238-649: The uninitiated. For example, the British counter measures against the V-2 was called Operation Crossbow . The atomic bomb project centered in New Mexico was called the Manhattan Project , derived from the Manhattan Engineer District which managed the program. The code name for the American A-12 / SR-71 spy plane project, producing the fastest, highest-flying aircraft in the world,

32437-438: The use and publication of project code names. Some companies take great pains to never discuss or disclose project code names outside of the company (other than with outside entities who have a need to know, and typically are bound with a non-disclosure agreement ). Other companies never use them in official or formal communications, but widely disseminate project code names through informal channels (often in an attempt to create

32636-472: The use of polonium in the neutron initiators; if true for plutonium, it might mean that the gun-type design would not work. The consensus at the Los Alamos Laboratory was that it was not true, and that Joliot-Curie's results had been distorted by impurities. At the Los Alamos Laboratory, Emilio Segrè's P-5 (Radioactivity) Group set out to measure it in uranium-234 , −235 and −238, plutonium, polonium, protactinium and thorium . They were not too worried about

32835-401: The value calculated by Segrè, and he was swayed by Segrè's authority over that of a more junior [but unnamed] member of Segrè's group who had calculated 20 kt. Calculations stated that even if the mechanical and electrical systems did not fail, the likelihood of a non-optimal test was greater than 10%. Enrico Fermi offered to take wagers among the top physicists and military present on whether

33034-585: The water supply would be adequate, but otherwise felt that it was ideal. The United States Under Secretary of War , Robert P. Patterson , approved the acquisition of the site on 25 November 1942, authorizing $ 440,000 for the purchase of the site of 54,000 acres (22,000 ha), all but 8,900 acres (3,600 ha) of which were already owned by the Federal Government. Secretary of Agriculture Claude R. Wickard granted use of some 45,100 acres (18,300 ha) of United States Forest Service land to

33233-431: The work could be performed by 50 scientists and 50 technicians. Groves tripled this number to 300. The actual population, including family members, was about 3,500 by the end of 1943, 5,700 by the end of 1944, 8,200 by the end of 1945, and 10,000 by the close of 1946. Initially, all of the population were workers, as they were the only ones for whom housing was supplied, but as time went on and more housing became available,

33432-612: Was Oxcart . The American group that planned that country's first ICBM was called the Teapot Committee . Although the word could stand for a menace to shipping (in this case, that of Japan), the American code name for the attack on the subtropical island of Okinawa in World War II was Operation Iceberg . The Soviet Union's project to base missiles in Cuba was named Operation Anadyr after their closest bomber base to

33631-555: Was "TRIDENT". Joseph Stalin , whose last name means "man of steel", was given the name "GLYPTIC", meaning "an image carved out of stone". Ewen Montagu , a British Naval intelligence officer, discloses in Beyond Top Secret Ultra that during World War II , Nazi Germany habitually used ad hoc code names as nicknames which often openly revealed or strongly hinted at their content or function. Some German code names: Conversely, Operation Wacht am Rhein (Watch on

33830-569: Was a long device, and its name came from the Dashiell Hammett detective novel and series of movies of the same name. The Fat Man was round and fat, and was named after Sydney Greenstreet 's "Kasper Gutman" character in The Maltese Falcon . Little Boy came last, and was named after Elisha Cook, Jr. 's character in the same film, as referred to by Humphrey Bogart . A series of conferences in April and May 1943 laid out

34029-509: Was a name common to rivers and peaks in the West and would not attract attention, and elicited this reply: I did suggest it, but not on that ground ... Why I chose the name is not clear, but I know what thoughts were in my mind. There is a poem of John Donne, written just before his death, which I know and love. From it a quotation: "As West and East / In all flatt Maps – and I am one – are one, / So death doth touch

34228-407: Was a strong indication of multiple allotropes of plutonium ; but was initially considered too bizarre to be true. Further testing confirmed a state change around 135 °C (275 °F); it entered the δ phase, with a density of 16 g/cm . Seaborg had claimed that plutonium had a melting point of around 950 to 1,000 °C (1,740 to 1,830 °F), about that of uranium, but the metallurgists at

34427-563: Was activated at Fort Sill, Oklahoma , on 17 April 1943. Its initial strength was just one officer and seven auxiliaries. The WAAC became the Women's Army Corps (WAC) on 24 August 1943, and the detachment became part of the 4817th Service Command Unit, with a strength of two officers and 43 enlisted women. They were sworn into the United States Army by Ashbridge. It reached a peak strength of about 260 women in August 1945. The WACs did

34626-414: Was answerable directly to Groves, and was responsible for the township, government property and the military personnel. Four military units were assigned to the post. The MP Detachment, 4817th Service Command Unit, arrived from Fort Riley, Kansas , in April 1943. Its initial strength was 7 officers and 196 enlisted men; by December 1946 it had 9 officers and 486 men, and was manning 44 guard posts 24 hours

34825-467: Was at least 5,000 tons and probably a lot more." Code name During World War I , names common to the Allies referring to nations, cities, geographical features, military units, military operations, diplomatic meetings, places, and individual persons were agreed upon, adapting pre-war naming procedures in use by the governments concerned. In the British case names were administered and controlled by

35024-459: Was blinded by a light which appeared instantaneously all about without any build up of intensity. My left eye could see the ball of fire start up like a tremendous bubble or nob-like mushroom. I dropped the glass from my left eye almost immediately and watched the light climb upward. The light intensity fell rapidly, hence did not blind my left eye but it was still amazingly bright. It turned yellow, then red, and then beautiful purple . At first it had

35223-403: Was built to allow for large conferences and briefings, and the mess hall had to be upgraded. Because dust thrown up by vehicles interfered with some of the instrumentation, 20 miles (32 km) of road was sealed. The term " gadget "—a laboratory euphemism for a bomb—gave the laboratory's weapon physics division, "G Division", its name in August 1944. At that time it did not refer specifically to

35422-463: Was carried out at Muroc Army Air Field in March and June 1944. At a meeting of the S-1 Executive Committee on 14 November 1942, Chadwick had expressed a fear that the alpha particles emitted by plutonium could produce neutrons in light elements present as impurities, which in turn would produce fission in the plutonium and cause a predetonation , a chain reaction before the core was fully assembled. This had been considered by Oppenheimer and Seaborg

35621-434: Was confident that there would be enough for a second test. The use of Jumbo would interfere with the gathering of data on the explosion, the primary objective of the test. An explosion of more than 500 tons of TNT (2,100 GJ) would vaporize the steel and make it difficult to measure the thermal effects. Even 100 tons of TNT (420 GJ) would send fragments flying, presenting a hazard to personnel and measuring equipment. It

35820-464: Was created to control testing, stockpiling and bomb assembly activities, which were concentrated at Sandia Base . The Los Alamos Laboratory became Los Alamos Scientific Laboratory in 1947. The discovery of the neutron by James Chadwick in 1932, followed by the discovery of nuclear fission by chemists Otto Hahn and Fritz Strassmann in 1938, and its explanation (and naming) by physicists Lise Meitner and Otto Frisch soon after, opened up

36019-757: Was discussed at a meeting at the General Electric Research Laboratory in Schenectady, New York , on 21 October 1941. In December 1941, the S-1 Section of the Office of Scientific Research and Development (OSRD) placed Arthur H. Compton in charge of overseeing the scientific research for production and design of the bomb. He delegated bomb design and the making of fast neutron calculations —the key to calculations of critical mass and weapon detonation—to Gregory Breit , who

36218-467: Was dissolved, and Hempelmann poured the solution into the tubing. The test was scheduled for May 5 but was postponed for two days to allow for more equipment to be installed. Requests for further postponements had to be refused because they would have affected the schedule for the main test. The detonation time was set for 04:00 Mountain War Time (MWT), on May 7, but there was a 37-minute delay to allow

36417-458: Was due to start on July 16 and President Harry S. Truman wanted the test to be conducted before the conference began. It was therefore scheduled for July 16, the earliest date at which the bomb components would be available. The detonation was initially planned for 04:00 MWT but was postponed because of rain and lightning from early that morning. It was feared that the danger from radiation and fallout would be increased by rain, and lightning had

36616-404: Was engaged as architect and engineer. Black & Veatch was brought in for the design of utilities in December 1945. The former was paid $ 743,706.68 and the latter $ 164,116 by the time the Manhattan Project ended at the end of 1946. The Albuquerque District supervised $ 9.3 million of construction at Los Alamos, and the Manhattan District, another $ 30.4 million. The initial work was contracted to

36815-430: 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,

37014-567: Was given the title of "Co-ordinator of Rapid Rupture", and Oppenheimer as an assistant. But Breit disagreed with other scientists working at the Metallurgical Laboratory , particularly Enrico Fermi , over the security arrangements, and resigned on 18 May 1942. Compton then appointed Oppenheimer to replace him. John H. Manley , a physicist at the Metallurgical Laboratory, was assigned to assist Oppenheimer by contacting and coordinating experimental physics groups scattered across

37213-728: Was hardly felt at 15,000 feet (4,600 m). Herbert L. Anderson practiced using a converted M4 Sherman tank lined with lead to approach the 5-foot-deep (1.5 m) and 30-foot-wide (9 m) blast crater and take a soil sample, although the radioactivity was low enough to allow several hours of unprotected exposure. An electrical signal of unknown origin caused the explosion to go off 0.25 seconds early, ruining experiments that required split-second timing. The piezoelectric gauges developed by Anderson's team correctly indicated an explosion of 108 tons of TNT, but Luis Alvarez and Waldman's airborne condenser gauges were far less accurate. In addition to uncovering scientific and technological issues,

37412-592: Was just entering production, which could be adapted for use as a radar altimeter. The third unit to be made was delivered to Los Alamos in April 1944. In May it was tested by diving an AT-11 . This was followed by full-scale drop testing in June and July. These were very successful, whereas the AYD continued to suffer from problems. Archie was therefore adopted, although the scarcity of units in August 1944 precluded wholescale destructive testing. Testing of Silverplate Boeing B-29 Superfortress aircraft with Thin Man bomb shapes

37611-488: Was mostly drawn from the defunct Army Specialized Training Program . War Department policy forbade giving deferments from the draft to men under 22, so they were assigned to the SED. It reached a peak strength of 1,823 men in August 1945. SED personnel worked in all areas of the Los Alamos Laboratory. As director of the Los Alamos Laboratory, Oppenheimer was no longer answerable to Compton, but reported directly to Groves. He

37810-427: Was not completed until the autumn of 1944. John von Neumann visited the Los Alamos Laboratory in September 1943 and participated in discussions of the damage that an atomic bomb would do. He explained that while the damage done by a small explosion was proportional to the impulse (the average pressure of the explosion times its duration), the damage from large explosions such as an atomic bomb would be determined by

38009-564: Was not used in the test. On May 7, 1945, a rehearsal was conducted, during which 108 short tons (98 t) of high explosive spiked with radioactive isotopes was detonated. Some 425 people were present on the weekend of the Trinity test. Observers included Vannevar Bush , James Chadwick , James B. Conant , Thomas Farrell , Enrico Fermi , Hans Bethe , Richard Feynman , Isidor Isaac Rabi , Leslie Groves , Robert Oppenheimer, Frank Oppenheimer , Geoffrey Taylor , Richard Tolman , Edward Teller , and John von Neumann . The Trinity bomb released

38208-412: Was replaced by five Army telephone lines. This was increased to eight in March 1945. There were also three teletypewriters with encoding machines. The first was installed in March 1943, and two more were added in May 1943. One was removed in November 1945. There were telephones in the offices, but none in private residences, as the Army regarded this as a security hazard. There were some public phones in

38407-445: Was responsible for the technical and scientific aspects of Project Y. He assembled the nucleus of his staff from the groups that had been working for him on neutron calculations. These included his secretary, Priscilla Greene , Serber and McMillan from his own group, and Emilio Segrè and Joseph W. Kennedy 's groups from the University of California, J. H. Williams ' group from the University of Minnesota , Joe McKibben 's group from

38606-403: Was that it would be militarized when the time came to finally assemble the bomb, but by this time the Los Alamos Laboratory had grown so large that this was considered both impractical and unnecessary, as the anticipated difficulties regarding civilians working on dangerous tasks had not occurred. Colonel John M. Harman was the first post commander at Los Alamos. He joined the Santa Fe office as

38805-573: Was that the British scientists would work as a group under Chadwick, who would farm out work to them. This was soon discarded in favor of having the British Mission fully integrated into the laboratory. They worked in most of its divisions, only being excluded from plutonium chemistry and metallurgy. With the passage of the Atomic Energy Act of 1946 , known as the McMahon Act, all British government employees had to leave. All had left by

39004-607: Was the Alamogordo Bombing and Gunnery Range (renamed the White Sands Proving Ground just before the test). The only structures originally in the immediate vicinity were the McDonald Ranch House and its ancillary buildings, which scientists used as a laboratory for testing bomb components. Fears of a fizzle prompted construction of "Jumbo", a steel containment vessel that could contain the plutonium, allowing it to be recovered; but ultimately Jumbo

39203-494: Was the same. When they managed to reduce it to plutonium metal in November 1943, the density was measured at 15 g/cm , and a measurement using X-ray scattering techniques pointed to a density of 13 g/cm . This was bad; it had been assumed that its density was the same as uranium, about 19 g/cm . If these figures were correct, far more plutonium would be needed for a bomb. Kennedy disliked Seaborg's ambitious and attention-seeking manner, and with Arthur Wahl had devised

39402-668: Was theoretically possible. There were still many unknown factors. The properties of pure uranium-235 were relatively unknown; even more so those of plutonium , a chemical element that had only recently been discovered by Glenn Seaborg and his team in February 1941, but which was theoretically fissile . The scientists at the Berkeley conference envisioned breeding plutonium in nuclear reactors from uranium-238 atoms that absorbed neutrons from fissioning uranium-235 atoms. At this point no reactor had been built, and only microscopic quantities of plutonium were available that had been produced by cyclotrons . There were many ways of arranging

39601-408: Was therefore decided not to use it. Instead, it was hoisted up a steel tower 800 yards (732 m) from the explosion, where it could be used for a subsequent test. In the end, Jumbo survived the explosion, although its tower did not. Jumbo was destroyed on April 16, 1946, when an Army ordnance team detonated eight 500 lb bombs in the bottom of the steel container. Jumbo, with its steel banding around

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