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This article is about the World War II nuclear project. For other uses of the name "The Manhattan Project", see Manhattan Project (disambiguation).
The Manhattan Project resulted in the creation of the first nuclear weapons, and the first-ever nuclear detonation, known as the Trinity test of July 16, 1945.
The Manhattan Project resulted in the creation of the first nuclear weapons, and the first-ever nuclear detonation, known as the Trinity test of July 16, 1945. A nuclear weapon is an explosive device that derives its destructive force from Nuclear reactions either fission or a combination of fission and fusion. Nuclear weapons tests are experiments carried out to determine the effectiveness yield and explosive capability of Nuclear weapons Throughout the twentieth century most nations Trinity was the first test of technology for a Nuclear weapon. Events 622 - The beginning of the Islamic calendar. 1054 - Three Roman legates fractured relations between the Western and Year 1945 ( MCMXLV) was a Common year starting on Monday (link will display the full calendar

The Manhattan Project was the project to develop the first nuclear weapon (atomic bomb) during World War II by the United States, the United Kingdom, and Canada. A nuclear weapon is an explosive device that derives its destructive force from Nuclear reactions either fission or a combination of fission and fusion. World War II, or the Second World War, (often abbreviated WWII) was a global military conflict which involved a majority of the world's nations, including The United States of America —commonly referred to as the The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom, the UK or Britain,is a Sovereign state located Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page Formally designated as the Manhattan Engineer District (MED), it refers specifically to the period of the project from 1941–1946 under the control of the U.S. Army Corps of Engineers, under the administration of General Leslie R. Groves. The United States Army Corps of Engineers ( USACE) is a federal agency and a major Army command made up of some 34600 Civilian and 650 Military personnel Lieutenant General Leslie Richard Groves ( August 17, 1896 &ndash July 13, 1970) was a United States Army Engineer The scientific research was directed by American physicist J. Robert Oppenheimer. Physics (Greek Physis - φύσις in everyday terms is the Science of Matter and its motion. [1]

The project's roots lay in scientists' fears since the 1930s that Nazi Germany was also investigating nuclear weapons of its own. Nazi Germany and the Third Reich are the common English names for Germany under the regime of Adolf Hitler and the National Socialist German Workers The German nuclear energy project in Nazi Germany was informally known as the Uranverein (Uranium Club and it began in April 1939 just months Born out of a small research program in 1939, the Manhattan Project eventually employed more than 130,000 people and cost nearly $2 billion USD ($24 billion in 2008 dollars based on CPI). The United States dollar ( sign: $; code: USD) is the unit of Currency of the United States; it has also been CPI redirects here For other uses see CPI (disambiguation. A consumer price index ( CPI) is a measure of the average price of consumer It resulted in the creation of multiple production and research sites that operated in secret. [2]

The three primary research and production sites of the project were the plutonium-production facility at what is now the Hanford Site, the uranium-enrichment facilities at Oak Ridge, Tennessee, and the weapons research and design laboratory, now known as Los Alamos National Laboratory. The Hanford Site is a decommissioned nuclear production complex on the Columbia River in south-central Washington operated by the United States government Uranium (jʊˈreɪniəm is a silvery-gray Metallic Chemical element in the Oak Ridge is an incorporated City in Anderson and Roane Counties in East Tennessee, USA, about 25 miles northwest of Los Alamos National Laboratory (LANL (previously known at various times as Site Y, Los Alamos Laboratory, and Los Alamos Scientific Laboratory) is a Project research took place at over thirty sites across the United States, Canada, and the United Kingdom. The United States of America —commonly referred to as the Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom, the UK or Britain,is a Sovereign state located The MED maintained control over U. S. weapons production until the formation of the Atomic Energy Commission in January 1947. The United States Atomic Energy Commission (AEC was an agency of the United States government established after World War II by Congress to foster and control

Contents

Origin of name

270 Broadway from the east in 2007
270 Broadway from the east in 2007

The project was coordinated from the U. S. Army Corps of Engineers North Atlantic Division headquarters on the 18th floor of 270 Broadway near New York City Hall in Manhattan. The North Atlantic Division of the US Army Corps of Engineers is a Regional Business Center made up of nearly 3900 team members in six districts and a Division Headquarters Tower 270 (also known as 270 Broadway, Arthur Levitt State Office Building, and 86 Chambers Street) is a 28-story mixed use building in Downtown Manhattan New York City Hall is located at the center of City Hall Park in the Civic Center section of Lower Manhattan between Broadway, Park Row and Manhattan Island, in New York Harbor, is much the largest part of the Borough of Manhattan, one of the Five Boroughs which form the City of New York [3]

The initial proposed name was "Laboratory for the Development of Substitute Materials. "[4] Fearing the name would draw undue attention, General Leslie Groves changed it to the (secret) name "Manhattan Engineer District", for a non-existent administrative division of the US Army Corps of Engineers. Lieutenant General Leslie Richard Groves ( August 17, 1896 &ndash July 13, 1970) was a United States Army Engineer In daily parlance, the nickname became the Manhattan Project. A nickname is a Name of an entity or thing that is not its Proper name. [4] The Corps Manhattan district, unlike other regional Corps offices, was not to have territorial limits.

Much of the early research was done at Columbia University in Pupin Hall and at one time employed 700 people on the project. Columbia University is a private University in the United States and a member of the Ivy League. Pupin Hall is the home of the physics and astronomy departments at Columbia University in New York City. [4]

Coordination for the project moved to Oak Ridge in 1943, but the name Manhattan Engineer District was not changed. Oak Ridge is an incorporated City in Anderson and Roane Counties in East Tennessee, USA, about 25 miles northwest of

Discovery of nuclear fission

Main articles: History of physics, History of nuclear weapons, and World War II

The first decades of the twentieth century led to radical changes in the understanding of the physics of the atom, including the discovery of the nucleus, the idea of radiation, and the fact that the splitting of atomic nuclei could lead to massive release of energy (nuclear fission). The modern discipline of Physics emerged in the 17th century following in traditions of inquiry established by Galileo Galilei, René Descartes, Isaac The history of nuclear weapons chronicles the development of Nuclear weapons. World War II, or the Second World War, (often abbreviated WWII) was a global military conflict which involved a majority of the world's nations, including Physics (Greek Physis - φύσις in everyday terms is the Science of Matter and its motion. Radiation, as in Physics, is Energy in the form of waves or moving Subatomic particles emitted by an atom or other body as it changes from a higher energy Nuclear fission is the splitting of the nucleus of an atom into parts (lighter nuclei) often producing Free neutrons and other smaller nuclei which may

By 1932, the atom was thought to consist of a small, dense nucleus containing most of the atom's mass in the form of protons and neutrons and was surrounded by a shell of electrons. The nucleus of an Atom is the very dense region consisting of Nucleons ( Protons and Neutrons, at the center of an atom The atomic mass (ma is the Mass of an atom most often expressed in unified atomic mass units The atomic mass may be considered to be the total mass The proton ( Greek πρῶτον / proton "first" is a Subatomic particle with an Electric charge of one positive This article is a discussion of neutrons in general For the specific case of a neutron found outside the nucleus see Free neutron. The electron is a fundamental Subatomic particle that was identified and assigned the negative charge in 1897 by J Study on the phenomenon of radioactivity began with the discovery of uranium ores by Henri Becquerel in 1896 and was followed by the work of Pierre and Marie Curie on radium. Radioactive decay is the process in which an unstable Atomic nucleus loses energy by emitting ionizing particles and Radiation. Antoine Henri Becquerel (15 December 1852 &ndash 25 August 1908 was a French Physicist, Nobel laureate, and one of the discoverers of Radioactivity Pierre Curie (15 May 1859 &ndash 19 April 1906 was a French physicist, a pioneer in Crystallography, Magnetism, Piezoelectricity Radium (ˈreɪdiəm is a radioactive Chemical element which has the symbol Ra and Atomic number 88 Their research seemed to promise that atoms, previously thought to be ultimately stable and indivisible, actually had the potential of containing and releasing immense amounts of energy. In 1919 Ernest Rutherford achieved the first artificial nuclear disintegrations by bombarding nitrogen with alpha particles emitted from a radioactive source, thus becoming the first person in history to intentionally "split the atom". Ernest Rutherford 1st Baron Rutherford of Nelson, OM, PC, FRS (30 August 1871 – 19 October 1937 was a New Zealand Physicist Nitrogen (ˈnaɪtɹəʤɪn is a Chemical element that has the symbol N and Atomic number 7 and Atomic weight 14 Alpha particles (named after and denoted by the first letter in the Greek alphabet, α consist of two Protons and two Neutrons bound together into a It had become clear from the Curies' work that there was a tremendous amount of energy locked up in radioactive decay—far more than chemistry could account for. Radioactive decay is the process in which an unstable Atomic nucleus loses energy by emitting ionizing particles and Radiation. But even in the early 1930s such illustrious physicists as Ernest Rutherford and Albert Einstein could see no way of artificially releasing that energy any faster than nature naturally allowed it to leave. Ernest Rutherford 1st Baron Rutherford of Nelson, OM, PC, FRS (30 August 1871 – 19 October 1937 was a New Zealand Physicist Albert Einstein ( German: ˈalbɐt ˈaɪ̯nʃtaɪ̯n; English: ˈælbɝt ˈaɪnstaɪn (14 March 1879 – 18 April 1955 was a German -born theoretical "Radium engines" in the 1930s were the stuff of science fiction, such as was being written at the time by Edgar Rice Burroughs. Edgar Rice Burroughs ( September 1, 1875 – March 19, 1950) was an American author best known for his creation of the jungle hero H. G. Wells included air-dropped "atomic bombs" in his 1914 novel The World Set Free. Herbert George Wells (21 September 1866 &ndash 13 August 1946 He was an outspoken socialist and a pacifist, his later works becoming increasingly political A novel (from Italian novella, Spanish novela, French nouvelle for "new" "news" or "short story The World Set Free is a novel published in 1914 by H G Wells. Though Wells' "atomic bombs" bore little resemblance to actual nuclear weapons (they were simply regular bombs that never stopped exploding), Leó Szilárd later commented that this story influenced his later research into this subject. Leó Szilárd (Szilárd Leó February 11, 1898 – May 30, 1964) was an Hungarian - American Physicist who

Progress in controlling and understanding nuclear fission accelerated in the 1930s when further manipulation of the nuclei of atoms became possible. In 1932, Sir John Cockcroft and Ernest Walton were first to "split the atom" (cause a nuclear reaction) by using artificially accelerated particles. Sir John Douglas Cockcroft OM KCB CBE ( May 27, 1897 &ndash September 18, 1967) was a British physicist. Ernest Thomas Sinton Walton (6 October 1903 &ndash 25 June 1995 was an Irish physicist and Nobel laureate for his work with John Cockcroft with In 1934, Irène and Frédéric Joliot-Curie discovered that artificial radioactivity could be induced in stable elements by bombarding them with alpha particles. Irène Joliot-Curie ( 12 September 1897 &ndash 17 March 1956) was a French scientist the Daughter of Marie Skłodowska-Curie Jean Frédéric Joliot-Curie born Joliot ( March 19, 1900 &ndash August 14, 1958) was a French Physicist and Radioactive decay is the process in which an unstable Atomic nucleus loses energy by emitting ionizing particles and Radiation. The same year Enrico Fermi reported similar results when bombarding uranium with neutrons (discovered in 1932), but he did not immediately appreciate the consequences of his results. This article is a discussion of neutrons in general For the specific case of a neutron found outside the nucleus see Free neutron.

In December 1938, the Germans Otto Hahn and Fritz Strassmann published experimental results about bombarding uranium with neutrons. Germany, officially the Federal Republic of Germany ( ˈbʊndəsʁepuˌbliːk ˈdɔʏtʃlant is a Country in Central Europe. Otto Hahn (8 March 1879 &ndash 28 July 1968 was a German Chemist who received the 1944 Nobel Prize in Chemistry for discovering Nuclear fission Friedrich Wilhelm "Fritz" Strassman ( February 22, 1902 - April 22, 1980) was a German chemist who with They showed that it produced an isotope of barium. Barium (ˈbɛəriəm is a Chemical element. It has the symbol Ba, and Atomic number 56 Shortly after, their Austrian co-worker Lise Meitner (a political refugee in Sweden at the time) and her nephew Otto Robert Frisch correctly interpreted the results as the splitting of the uranium nucleus after the absorption of a neutron—nuclear fission—which released a large amount of energy and additional neutrons. Lise Meitner (7 or 17 November 1878 &ndash 27 October 1968 was an Austrian born later Swedish physicist who studied Radioactivity and "Sverige" redirects here For other uses see Sweden (disambiguation and Sverige (disambiguation. Otto Robert Frisch ( 1 October 1904 &ndash 22 September 1979) Austrian British Physicist. Binding energy is the Mechanical energy required to disassemble a whole into separate parts A direct experimental evidence of the nuclear fission was performed by Frisch, following a fundamental idea suggested to him by George Placzek [5]. George Placzek ( September 26, 1905 - October 9, 1955) was a Czech physicist

In 1933, Hungarian physicist Leó Szilárd had proposed that if any neutron-driven process released more neutrons than those required to start it, an expanding nuclear chain reaction might result. Hungary (Magyarország 'mɔɟɔrorsaːg) officially in English the Republic of Hungary ( Magyar Köztársaság, literally Magyar (Hungarian Republic Leó Szilárd (Szilárd Leó February 11, 1898 – May 30, 1964) was an Hungarian - American Physicist who A nuclear chain reaction occurs when one Nuclear reaction causes an average of one or more nuclear reactions thus leading to a self-propagating number of these reactions Chain reactions were familiar as a phenomenon from chemistry (where they typically caused explosions and other run-away reactions), but Szilárd was proposing them for a nuclear reaction, for the first time. However, Szilárd had proposed to look for such reactions in the lighter atoms, and nothing of the sort was found. Upon experimentation shortly after the uranium fission discovery, Szilárd found that the fission of uranium released two or more neutrons on average, and immediately realized that a nuclear chain reaction by this mechanism was possible in theory. In scientific inquiry an experiment ( Latin: Ex- periri, "to try out" is a method of investigating particular types of research questions or Szilárd kept this secret at first because he feared its use as a weapon by fascist governments. Fascism is a totalitarian nationalist and corporatist ideology He convinced others to do so, but identical results were soon published by the Joliot Curie group, to his great dismay.

That such mechanisms might have implications for civilian power or military weapons was perceived by numerous scientists in many countries, around the same time. While these developments in science were occurring, many political changes were happening in Europe. Adolf Hitler was appointed chancellor of Germany in January 1933. Hi and welcome to Wikipedia! Please understand that this article is frequently vandalized and vandalism is reverted immediately His anti-Semitic ideology caused all Jewish civil servants, including many physicists, to be fired from their posts. Antisemitism (alternatively spelled anti-semitism or anti-Semitism; also rarely known as judeophobia) is the Prejudice against or hostility PLEASE TAKE NOTE************ The racial policy of Nazi Germany refers to the policies and laws implemented by Nazi Germany, asserting the superiority of the so-called " Aryan race " and Consequently many European physicists who later made key discoveries went into exile in the United Kingdom and the United States. The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom, the UK or Britain,is a Sovereign state located The United States of America —commonly referred to as the After Nazi Germany invaded Poland in 1939 and World War II began, many scientists in the United States and the United Kingdom became anxious about what Germany might do with nuclear technology. Nazi Germany and the Third Reich are the common English names for Germany under the regime of Adolf Hitler and the National Socialist German Workers Poland (Polska officially the Republic of Poland World War II, or the Second World War, (often abbreviated WWII) was a global military conflict which involved a majority of the world's nations, including Nuclear technology is technology that involves the reactions of atomic nuclei. Albert Einstein in particular wrote several letters to Franklin Roosevelt urging him to establish the nuclear capability before the Germans. Albert Einstein ( German: ˈalbɐt ˈaɪ̯nʃtaɪ̯n; English: ˈælbɝt ˈaɪnstaɪn (14 March 1879 – 18 April 1955 was a German -born theoretical These letters, especially one called the Einstein-Szilárd letter (written in August 1939, but not personally received by Roosevelt until October 1939), are considered to be influential in the acceleration of the project. The Einstein-Szilárd letter was a letter sent to President Franklin Delano Roosevelt on August 2 1939 signed by Albert Einstein but largely written by Leó

Acceleration of the Project

A few months after he was put in charge of fast neutron research, Berkeley physicist J. Robert Oppenheimer convened a conference on the topic of nuclear weapon design.
A few months after he was put in charge of fast neutron research, Berkeley physicist J. Robert Oppenheimer convened a conference on the topic of nuclear weapon design. Nuclear weapon designs are physical chemical and engineering arrangements that cause the physics package of a nuclear weapon to detonate

Having begun to wrest control of the uranium research from the National Bureau of Standards, the project heads began to accelerate the bomb project under the OSRD. The Office of Scientific Research and Development (OSRD was an agency of the United States federal government created to coordinate scientific research for military purposes Arthur Compton organized the University of Chicago Metallurgical Laboratory in early 1942 to study plutonium and fission piles (primitive nuclear reactors), and asked theoretical physicist Robert Oppenheimer of the University of California, Berkeley to take over research on fast neutron calculations—key to calculations about critical mass and weapon detonation—from Gregory Breit. Arthur Holly Compton (September 10 1892 &ndash March 15 1962 was an American physicist and Nobel laureate in physics for his discovery of the Compton effect The Metallurgical Laboratory or "Met Lab" at the University of Chicago was part of the World War II –era Manhattan Project, created by the This article is a subarticle of Nuclear power. A nuclear reactor is a device in which Nuclear chain reactions are initiated controlled The University of California Berkeley (also referred to as Cal, Berkeley and UC Berkeley) is a major research university located in Berkeley Gregory Breit ( July 14, 1899 &ndash September 11, 1981) was a Russian-born American Physicist and professor at universities John Manley, a physicist at the Metallurgical Laboratory, was assigned to help Oppenheimer find answers by coordinating and contacting several experimental physics groups scattered across the country. John H Manley ( July 21, 1907 &ndash June 11, 1990) was an American Physicist who worked with J

During the spring of 1942, Oppenheimer and Robert Serber of the University of Illinois worked on the problems of neutron diffusion (how neutrons moved in the chain reaction) and hydrodynamics (how the explosion produced by the chain reaction might behave). Robert Serber ( March 14 1909 - June 1 1997) was an American physicist who participated in the Manhattan Project. This article is about the flagship campus For other uses and locations of University of Illinois, see University of Illinois (disambiguation The University of Fluid dynamics is the sub-discipline of Fluid mechanics dealing with fluid flow: Fluids ( Liquids and Gases in motion To review this work and the general theory of fission reactions, Oppenheimer convened a summer study at the University of California, Berkeley, in June 1942. Theorists Hans Bethe, John Van Vleck, Edward Teller, Felix Bloch, Emil Konopinski, Robert Serber, Stanley S. Hans Albrecht Bethe (/hans ˈalbʀɛçt ˈbeːtə/ ( July 2 1906 &ndash March 6, 2005) was a German - American Physicist John Hasbrouck Van Vleck ( March 13, 1899 &ndash October 27, 1980) was an American physicist. Edward Teller (original Hungarian name Teller Ede) (January 15 1908 &ndash September 9 2003 was a Hungarian -American theoretical Physicist This page addresses only the Swiss physicist for the man accused of espionage see Felix Bloch (diplomatic officer Felix Bloch ( October 23 Emil John (Jan Konopinski ( December 25, 1911 in Michigan City, Indiana - May 26, 1990 in Bloomington, Frankel, and Eldred C. Nelson (the latter three all former students of Oppenheimer) quickly confirmed that a fission bomb was feasible. There were still many unknown factors in the development of a nuclear bomb, however, even though it was considered to be theoretically possible. The properties of pure uranium-235 were still relatively unknown, as were the properties of plutonium, a new element which had only been discovered in February 1941 by Glenn Seaborg and his team. Glenn Theodore Seaborg ( Glenn Teodor Sjöberg) ( April 19, 1912 &ndash February 25, 1999) won the 1951 Nobel Prize in Chemistry Plutonium was the product of uranium-238 absorbing a neutron which had been emitted from a fissioning uranium-235 atom, and was thus able to be created in a nuclear reactor. But at this point no reactor had yet been built, so while plutonium was being pursued as an additional fissile substance, it was not yet to be relied upon. Only microgram quantities of plutonium existed at the time (produced from neutrons derived from reaction started in a cyclotron).

A number of the different fission bomb assembly methods explored during the summer 1942 conference, later reproduced as drawings in The Los Alamos Primer. In the end, only the "gun" method (at top) and a more complicated variation of the "implosion" design would be used. At the bottom are "autocatalytic method" designs.
A number of the different fission bomb assembly methods explored during the summer 1942 conference, later reproduced as drawings in The Los Alamos Primer. The Los Alamos Primer was a printed version of the first five lectures on the principles of Nuclear weapons given to new arrivals at the top-secret Los Alamos In the end, only the "gun" method (at top) and a more complicated variation of the "implosion" design would be used. At the bottom are "autocatalytic method" designs.

The scientists at the Berkeley conference determined that there were many possible ways of arranging the fissile material into a critical mass, the simplest being the shooting of a "cylindrical plug" into a sphere of "active material" with a "tamper"—dense material which would focus neutrons inward and keep the reacting mass together to increase its efficiency (this model "avoids fancy shapes", Serber would later write). [6] They also explored designs involving spheroids, a primitive form of "implosion" (suggested by Richard C. Tolman), and explored the speculative possibility of "autocatalytic methods" which would increase the efficiency of the bomb as it exploded. Equation A spheroid centered at the origin and rotated about the z axis is defined by the implicit equation \left(\frac{x}{a}\right^2+\left(\frac{y}{a}\right^2+\left(\frac{z}{b}\right^2 Richard Chace Tolman ( March 4 1881 &ndash September 5 1948) was an American mathematical physicist and Physical chemist A single Chemical reaction is said to have undergone autocatalysis, or be autocatalytic, if the reaction product is itself the Catalyst for that reaction

Considering the idea of the fission bomb theoretically settled until more experimental data were available, the conference then turned in a different direction. Hungarian physicist Edward Teller pushed for discussion on an even more powerful bomb: the "Super", which would use the explosive force of a detonating fission bomb to ignite a fusion reaction in deuterium and tritium. In Physics and Nuclear chemistry, nuclear fusion is the process by which multiple- like charged atomic nuclei join together to form a heavier nucleus Deuterium, also called heavy hydrogen, is a Stable isotope of Hydrogen with a Natural abundance in the Oceans of Earth Tritium (ˈtɹɪtiəm symbol or, also known as Hydrogen-3) is a radioactive Isotope of Hydrogen. This concept was based on studies of energy production in stars made by Hans Bethe before the war, and suggested as a possibility to Teller by Enrico Fermi not long before the conference. When the detonation wave from the fission bomb moved through the mixture of deuterium and tritium nuclei, these would fuse together to produce much more energy than fission could. Deuterium, also called heavy hydrogen, is a Stable isotope of Hydrogen with a Natural abundance in the Oceans of Earth Tritium (ˈtɹɪtiəm symbol or, also known as Hydrogen-3) is a radioactive Isotope of Hydrogen. But Bethe was skeptical. As Teller pushed hard for his "superbomb"—now usually referred to as a "hydrogen bomb"—proposing scheme after scheme, Bethe refuted each one. The fusion idea had to be put aside in order to concentrate on actually 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. Bethe calculated, according to Serber, that it could not happen. In his book The Road from Los Alamos, Bethe says a refutation was written by Konopinski, C. Marvin, and Teller as report LA-602, showing that ignition of the atmosphere was impossible, not just unlikely. [7] In Serber's account, Oppenheimer mentioned it to Arthur Compton, who "didn't have enough sense to shut up about it. It somehow got into a document that went to Washington" which led to the question being "never laid to rest". [8]

The conferences in the summer of 1942 provided the detailed theoretical basis for the design of the atomic bomb, and convinced Oppenheimer of the benefits of having a single centralized laboratory to manage the research for the bomb project, rather than having specialists spread out at different sites across the United States.

Project sites

Though it involved over thirty different research and production sites, the Manhattan Project was largely carried out at three secret scientific cities that were established by power of eminent domain: Los Alamos, New Mexico; Oak Ridge, Tennessee; and Richland, Washington. Eminent domain ( United States) compulsory purchase ( United Kingdom, New Zealand, Ireland) resumption/compulsory acquisition Los Alamos (Los Álamos meaning "The Cottonwoods quot is a Townsite and Census-designated place (CDP in Los Alamos County, Oak Ridge is an incorporated City in Anderson and Roane Counties in East Tennessee, USA, about 25 miles northwest of Richland is a city in Benton County in the southeastern part of the U The Tennessee site was chosen for the vast quantities of cheap hydroelectric power already available there (due to the Tennessee Valley Authority) necessary to produce uranium-235 in giant ion separation magnets. The Tennessee Valley Authority (TVA is a federally owned Corporation in the United States created by congressional charter in May 1933 to provide The Hanford Site near Richland, Washington, was chosen for its location near a river that could supply water to cool the reactors which would produce the plutonium. The Hanford Site is a decommissioned nuclear production complex on the Columbia River in south-central Washington operated by the United States government The Columbia River (known as All the sites were suitably far from coastlines and therefore less vulnerable to possible enemy attack from Germany or Japan.

The Los Alamos National Laboratory was built on a mesa that previously hosted the Los Alamos Ranch School, a private school for teenage boys. Los Alamos National Laboratory (LANL (previously known at various times as Site Y, Los Alamos Laboratory, and Los Alamos Scientific Laboratory) is a Los Alamos Ranch School was a private Boarding school for boys near Otowi, New Mexico, in what would eventually become Los Alamos New Mexico The site was chosen primarily for its remoteness. Oppenheimer had known of it from his horse-riding near his ranch in New Mexico, and he showed it as a possible site to the government representatives, who promptly bought it for $440,000. In addition to being the main "think-tank", Los Alamos was responsible for final assembly of the bombs, mainly from materials and components produced by other sites. A bomb is any of a range of devices that typically rely on the Exothermic Chemical reaction of an Explosive material to produce an extremely Manufacturing at Los Alamos included casings, explosive lenses, and fabrication of fissile materials into bomb cores.

Oak Ridge facilities covered more than 60,000 acres (243 km²) of several former farm communities in the Tennessee Valley area. The Tennessee Valley is the Drainage basin of the Tennessee River and is largely within the U Some Tennessee families were given two weeks' notice to vacate family farms that had been their home for generations. So secret was the site during WW2 that the state governor was unaware that Oak Ridge (which was to become the fifth largest city in the state) was being built. At one point Oak Ridge plants were consuming 1/6th of the electrical power produced in the U. S. , more than New York City. The City of New York Oak Ridge mainly produced uranium-235.

The Hanford Site, which grew to almost 1,000 square miles (2,600 km²), took over irrigated farm land, fruit orchards, a railroad, and two farming communities, Hanford and White Bluffs, in a sparsely populated area adjacent to the Columbia River. An orchard is an intentional planting of Trees or Shrubs maintained for Food production. Hanford was a small agricultural community in Benton County Washington. White Bluffs was an agricultural Town in Benton County Washington. The Columbia River (known as Hanford hosted nuclear reactors cooled by the river and was the plutonium production center. "Riverine" redirects here For the use of that term in Maritime geography, see there

The existence of these sites and the secret cities of Los Alamos, Oak Ridge, and Richland were not made public until the announcement of the Hiroshima explosion, and the sites remained secret until after the end of WWII.

The project originally was headquartered at 270 Broadway in Manhattan. Manhattan Island, in New York Harbor, is much the largest part of the Borough of Manhattan, one of the Five Boroughs which form the City of New York Other offices were scattered throughout the city. [9] The Broadway headquarters lasted little more than a year before it was moved in 1943, although many of the other offices in Manhattan remained. [10]

A selection of U.S. sites important to the Manhattan Project.
A selection of U. S. sites important to the Manhattan Project.

Major Manhattan Project sites and subdivisions included:

Need for coordination

The measurements of the interactions of fast neutrons with the materials in a bomb were essential because the number of neutrons produced in the fission of uranium and plutonium must be known, and because the substance surrounding the nuclear material must have the ability to reflect, or scatter, neutrons back into the chain reaction before it is blown apart in order to increase the energy produced. The neutron temperature, also called the neutron energy, indicates a free neutron's Kinetic energy, usually given in Electron volts The term A neutron reflector is any material that reflects Neutrons Usually this term refers to the elastic scattering rather than to a Specular reflection. Therefore, the neutron scattering properties of materials had to be measured to find the best reflectors. The term "Neutron Scattering" encompasses all scientific techniques whereby the deflection of Neutron radiation is used as a scientific probe

Estimating the explosive power required knowledge of many other nuclear properties, including the cross section (a measure of the probability of an encounter between particles that result in a specified effect) for nuclear processes of neutrons in uranium and other elements. In nuclear and Particle physics, the concept of a cross section is used to express the likelihood of interaction between particles Fast neutrons could only be produced in particle accelerators, which were still relatively uncommon instruments in 1942.

The need for better coordination was clear. By September 1942, the difficulties in conducting studies on nuclear weapons at universities scattered throughout the country indicated the need for a laboratory dedicated solely to that purpose. A greater need was the construction of industrial plants to produce uranium-235 and plutonium—the fissionable materials to be used in the weapons.

Vannevar Bush, the head of the civilian Office of Scientific Research and Development (OSRD), asked President Roosevelt to assign the operations connected with the growing nuclear weapons project to the military. Vannevar Bush ( March 11, 1890 &ndash June 30, 1974; pronounced "VAN-ee-var" ˈvæˌniː The Office of Scientific Research and Development (OSRD was an agency of the United States federal government created to coordinate scientific research for military purposes Roosevelt chose the Army to work with the OSRD in building production plants. The Army Corps of Engineers selected Col. The United States Army Corps of Engineers ( USACE) is a federal agency and a major Army command made up of some 34600 Civilian and 650 Military personnel James Marshall to oversee the construction of factories to separate uranium isotopes and manufacture plutonium for the bomb.

Marshall and his deputy, Col. Kenneth Nichols, struggled to understand the proposed processes and the scientists with whom they had to work. Kenneth David Nichols ( 13 November 1907 – 21 February 2000) was the deputy to General Leslie Groves in the American project to develop Thrust into the new field of nuclear physics, they felt unable to distinguish between technical and personal preferences. Although they decided that a site near Knoxville, Tennessee, would be suitable for the first production plant, they did not know how large the site needed to be and delayed its acquisition.

Because of its experimental nature, the nuclear weapons work could not compete with the Army's more urgent tasks for priority. The scientists' work and production plant construction often were delayed by Marshall's inability to obtain critical materials, such as steel, needed in other military projects. Steel is an Alloy consisting mostly of Iron, with a Carbon content between 0

Even selecting a name for the project was difficult. The title chosen by Gen. Brehon B. Somervell, "Development of Substitute Materials," was objectionable because it seemed to reveal too much. Brehon Burke Somervell ( May 9, 1892 — February 13, 1955) was a General in the United States Army and Commanding General

Manhattan Engineer District

General Leslie Groves (left) was appointed the military head of the Manhattan Project, while Robert Oppenheimer (right) was the scientific director.
General Leslie Groves (left) was appointed the military head of the Manhattan Project, while Robert Oppenheimer (right) was the scientific director. Lieutenant General Leslie Richard Groves ( August 17, 1896 &ndash July 13, 1970) was a United States Army Engineer

Vannevar Bush became dissatisfied with Col. James Marshall's failure to get the project moving forward expeditiously and made this known to Secretary of War Stimson and Army Chief of Staff George Marshall. Marshall then directed General Somervell to replace Col. Marshall with a more energetic officer as director. In the summer of 1942, Col. Leslie Groves was deputy to the chief of construction for the Army Corps of Engineers and had overseen the very rapid construction of the Pentagon, the world's largest office building. Lieutenant General Leslie Richard Groves ( August 17, 1896 &ndash July 13, 1970) was a United States Army Engineer The Pentagon is the Headquarters of the United States Department of Defense, located in Arlington County, Virginia. He was widely respected as an intelligent, hard driving, though brusque officer who got things done in a hurry. Hoping for an overseas command, Groves vigorously objected when Somervell appointed him to the weapons project. His objections were overruled, and Groves resigned himself to leading a project he thought had little chance of success. Groves appointed Oppenheimer as the project's scientific director, to the surprise of many. (Oppenheimer's radical political views were thought to pose security problems). However, Groves was convinced Oppenheimer was a genius who could talk about and understand nearly anything, and he was convinced such a man was needed for a project such as the one being proposed.

Groves renamed the project The Manhattan Engineer District. The name evolved from the Corps of Engineers practice of naming districts after its headquarters' city (Marshall's headquarters were in New York City). At that time, Groves was promoted to brigadier general, giving him the rank necessary to deal with senior scientists in the project. Brigadier General is the lowest ranking General Officer in some countries usually sitting between the ranks of Colonel and Major General.

Within a week of his appointment, Groves had solved the Manhattan Project's most urgent problems. His forceful and effective manner was soon to become all too familiar to the atomic scientists.

The first major scientific hurdle of the project was solved on December 2, 1942, beneath the bleachers of Stagg Field at the University of Chicago, where a team led by Enrico Fermi, for whom Fermilab is named, initiated the first artificial [12] self sustaining nuclear chain reaction in an experimental nuclear reactor named Chicago Pile-1. Events 1409 - The University of Leipzig opens 1755 - The second Eddystone Lighthouse is destroyed by fire Year 1942 ( MCMXLII) was a Common year starting on Thursday (the link will display the full 1942 calendar of the Gregorian calendar. Bleachers redirects here For the novel see Bleachers (novel. Bleachers is a term used to describe the raised tiered stands found Alonzo Stagg Field is the name of two different football fields for the University of Chicago. Fermi National Accelerator Laboratory ( Fermilab) located in Batavia near Chicago, Illinois, is a U This article is a subarticle of Nuclear power. A nuclear reactor is a device in which Nuclear chain reactions are initiated controlled Chicago Pile-1 ( CP-1) was the world's first artificial Nuclear reactor. A coded phone call from Compton saying, "The Italian navigator [referring to Fermi] has landed in the new world, the natives are friendly" to Conant in Washington, D.C., brought news of the experiment's success. Italy (Italia officially the Italian Republic, (Repubblica Italiana is located on the Italian Peninsula in Southern Europe, and on the two largest A navigator is the person onboard a ship or aircraft responsible for its Navigation. Washington DC ( formally the District of Columbia and commonly referred to as Washington, the District, or simply D

Uranium bomb

A gun-type nuclear bomb.
A gun-type nuclear bomb.

The Hiroshima bomb, Little Boy, was made from uranium-235, a rare isotope of uranium that has to be physically separated from the more plentiful uranium-238 isotope, which is not suitable for use in an explosive device. The Japanese city of ( is the capital of Hiroshima Prefecture, and the largest city in the Chūgoku region of western Honshū, the largest of Japan 's Little Boy was the Codename of the Atomic bomb, developed via the "Manhattan Project" which was dropped on Hiroshima, on August 6 1945 by the Isotopes (Greek isos = "equal" tópos = "site place" are any of the different types of atoms ( Nuclides Isotope separation is the process of concentrating specific Isotopes of a Chemical element by removing other isotopes for example separating Natural uranium Since U-235 is only 0. 7% of raw uranium and is chemically identical to the 99. 3% of U-238, various physical methods were considered for separation.

Control panels and operators for calutrons at the Y-12 Plant in Oak Ridge, Tennessee.
Control panels and operators for calutrons at the Y-12 Plant in Oak Ridge, Tennessee. A Calutron was a Mass spectrometer used for separating the isotopes of Uranium developed by Ernest O The Y-12 National Security Complex is a United States Department of Energy National Nuclear Security Administration facility located in Oak Ridge Tennessee Oak Ridge National Laboratory ( ORNL) is a multiprogram science and technology National laboratory managed for the United States Department of Energy by

One method of separating uranium 235 from raw uranium ore was devised by Franz Simon and Nicholas Kurti, two Jewish émigrés, at Oxford University. Sir Francis Simon CBE born Franz Eugen Simon (1893-1956 was a German and later British physical chemist and physicist who devised the method and confirmed Professor Nicholas Kurti (Kürti Miklós FRS ( 14 May 1908 - 24 November 1998) was a Hungarian -born Physicist who lived The University of Oxford (informally "Oxford University" or simply "Oxford" located in the city of Oxford, Oxfordshire, England is the Their method using gaseous diffusion was scaled up in large separation plants at Oak Ridge Laboratories and used uranium hexafluoride (UF6) gas as the process fluid. Gaseous diffusion is a technology used to produce Enriched uranium by forcing gaseous Uranium hexafluoride, UF6 through semi-permeable membranes Uranium hexafluoride (UF6 referred to as "hex" in the nuclear industry is a compound used in the Uranium enrichment process that produces Uranium (jʊˈreɪniəm is a silvery-gray Metallic Chemical element in the Fluorine, fluorum meaning "to flow" is the Chemical element with the symbol F and Atomic number 9 This method eventually produced most of the U-235, although it was also important for producing partly enriched material to feed the calutrons (see below), which also produced significant U-235.

Another method—electromagnetic isotope separation—was developed by Ernest Lawrence at the University of California Radiation Laboratory at the University of California, Berkeley. Isotope separation is the process of concentrating specific Isotopes of a Chemical element by removing other isotopes for example separating Natural uranium Ernest Orlando Lawrence ( August 8, 1901 – August 27, 1958) was an American physicist and Nobel Laureate best known for his The Ernest Orlando Lawrence Berkeley National Laboratory ( LBNL) is a U The University of California Berkeley (also referred to as Cal, Berkeley and UC Berkeley) is a major research university located in Berkeley This method employed devices known as calutrons, which were effectively mass spectrometers. A Calutron was a Mass spectrometer used for separating the isotopes of Uranium developed by Ernest O Mass spectrometry is an analytical technique that identifies the chemical composition of a compound or sample based on the Mass-to-charge ratio of charged particles A total of 70,000,000 pounds of silver from the U. Silver (ˈsɪlvɚ is a Chemical element with the symbol " Ag " (argentum from the Ancient Greek: ἀργήντος - argēntos gen S. Treasury reserves was used for coils. (Copper was originally intended for the coils, but there was an insufficient amount available due to war shortages. The project engineers were forced to borrow silver from the Treasury, which was returned after the project ended. ) Initially the method seemed promising for large scale production but was expensive and produced insufficient material and was later abandoned after the war.

Other techniques were also tried, such as thermal diffusion. Most of this separation work was performed at Oak Ridge.

The uranium bomb was a gun-type fission weapon. Gun-type fission weapons are fission -based Nuclear weapons whose design assembles their fissile material into a supercritical mass by the One mass of U-235, the "bullet," is fired down a more or less conventional gun barrel into another mass of U-235, rapidly creating the critical mass of U-235, resulting in an explosion. For the fictional characters see Gunbarrel (Transformers. A gun barrel is the tube usually Metal, through which a controlled Explosion The method was so certain to work that no test was carried out before the bomb was dropped over Hiroshima. The Japanese city of ( is the capital of Hiroshima Prefecture, and the largest city in the Chūgoku region of western Honshū, the largest of Japan 's Also, the bomb dropped used all the existing extremely highly purified U-235 (and even most of the highly purified material) so there was no U-235 available for such a test anyway. The bomb's design was known to be inefficient and prone to accidental discharge. It has been estimated that only about 15% of the fissile material went critical.

Plutonium bomb

The basic concept of an implosion-style nuclear weapon. Actual pictures and details of the bomb's inner workings remain classified.
The basic concept of an implosion-style nuclear weapon. Actual pictures and details of the bomb's inner workings remain classified.

The bombs used in the first test at Trinity Site on July 16, 1945, in New Mexico (the gadget of the Trinity test), and in the Nagasaki bomb, Fat Man, were made primarily of plutonium-239, a synthetic element. Trinity was the first test of technology for a Nuclear weapon. Events 622 - The beginning of the Islamic calendar. 1054 - Three Roman legates fractured relations between the Western and Year 1945 ( MCMXLV) was a Common year starting on Monday (link will display the full calendar " The gadget " was the code-name given to the first nuclear explosive developed under the Manhattan Project during World War II, which was Trinity was the first test of technology for a Nuclear weapon. ( is the Capital and the largest city of Nagasaki Prefecture in Japan. "Fat Man" is the codename for the Atomic bomb that was detonated over Nagasaki, Japan, by the United States on August 9

Although uranium-238 is useless as fissile isotope for an atomic bomb, U-238 is used to produce plutonium. The fission of U-235 produces relatively slow neutrons which are absorbed by U-238, which after a few days of decay turns into plutonium-239. The production and purification of plutonium used techniques developed in part by Glenn Seaborg while working at Berkeley and Chicago. Glenn Theodore Seaborg ( Glenn Teodor Sjöberg) ( April 19, 1912 &ndash February 25, 1999) won the 1951 Nobel Prize in Chemistry Beginning in 1943, huge plants were built to produce plutonium at the Hanford Site. The Hanford Site is a decommissioned nuclear production complex on the Columbia River in south-central Washington operated by the United States government

A mock-up of the plutonium bomb, Fat Man
A mock-up of the plutonium bomb, Fat Man

From 1943–1944, development efforts were directed to a gun-type fission weapon with plutonium, called "Thin Man". Gun-type fission weapons are fission -based Nuclear weapons whose design assembles their fissile material into a supercritical mass by the The "Thin Man" (formally Mark 2) nuclear bomb was a proposed Plutonium gun-type nuclear bomb which the United States was Once this was achieved, the uranium version "Little Boy" would require a relatively simple adaptation, it was thought.

Initial tests of the properties of plutonium were done using cyclotron-generated plutonium-239, very pure but in very small amounts. A cyclotron is a type of Particle accelerator. Cyclotrons accelerate Charged particles using a high- Frequency, alternating Voltage (potential On April 5, 1944, Emilio Segrè at Los Alamos received the first sample of Hanford-produced plutonium. Events 456 - St Patrick returns to Ireland as a missionary bishop Year 1944 ( MCMXLIV) was a Leap year starting on Saturday (link will display full calendar of the Gregorian calendar. Emilio Gino Segrè ( February 1, 1905 – April 22, 1989) was an Italian Physicist and Nobel laureate in Within ten days, he discovered a fatal flaw: reactor-bred plutonium was far less isotopically pure than cyclotron-produced plutonium, and as a result had a much higher spontaneous fission rate than uranium-235. The unwanted isotope responsible for this high fission rate was plutonium-240, formed from plutonium-239 by capture of an additional neutron. Unlike the cyclotron, the plutonium breeding reactors had a much higher neutron flux and thus yielded an increased proportion of plutonium-240. Neutron flux is a term referring to the number of Neutrons passing through an Area over a span of Time. Plutonium-240 was even harder to separate from plutonium-239 than U-235 was to separate from U-238, so there was no question of doing so. The contaminating Pu-240 had to stay in the plutonium metal used in the bomb, where its spontaneous fissions were a source of unwanted neutrons. The implications of this made a "gun" detonation mechanism unsuitable. Because of the relatively slow speed of the gun device, "early" neutrons from spontaneously fissioning Pu-240 would start the reaction before the device was fully assembled by the gun process, and as a result, a plutonium bomb would "fizzle" (that is, heat up and blow itself apart) before it could be turned into a shape suitable for an efficient chain reaction which would split a substantial amount of the plutonium. Even a 1% fission of the material would result in a workable bomb, almost a thousand times more powerful than conventional bombs for the weight; but a fizzle promised far less even than this.

In July 1944, the decision was made to cease work on the plutonium gun method. There would be no "Thin Man. " The gun method was further developed for uranium only, which had few complications. Most efforts were then directed to a different method for plutonium.

In July 1944 the Los Alamos laboratory abandoned the plutonium gun-type bomb ("Thin Man", shown above) and focused almost entirely on the problem of implosion. (The Fat Man casing is also visible in the photo background.)
In July 1944 the Los Alamos laboratory abandoned the plutonium gun-type bomb ("Thin Man", shown above) and focused almost entirely on the problem of implosion. The "Thin Man" (formally Mark 2) nuclear bomb was a proposed Plutonium gun-type nuclear bomb which the United States was (The Fat Man casing is also visible in the photo background. )

Ideas of using alternative detonation schemes had existed for some time at Los Alamos. One of the more innovative had been the idea of "implosion"—a sub-critical sphere of fissile material could, using chemical explosives, be forced to collapse in on itself, creating a very dense critical mass, which because of the very short distances the metal needed to travel to make it, would come into existence for a far shorter time than it would take to assemble a mass from a bullet. Initially, implosion had been entertained as a possible, though unlikely method. However, after it was discovered that it was the only possible solution for using reactor-bred plutonium, and that uranium-235 production could not be substantially increased, the implosion project received the highest priority, as the only solution to scaling up fissionable material production to the level needed for multiple bombs. By the end of July 1944, the entire project had been reorganized around solving the implosion problem. It eventually involved using shaped charges with many explosive lenses to produce the perfectly spherical explosive wave needed to properly compress the plutonium sphere. A shaped charge is an Explosive charge shaped to focus the effect of the explosive's energy

Because of the complexity of an implosion-style weapon, it was decided that, despite the waste of fissile material, an initial test would be required. The first nuclear test took place on July 16, 1945, near Alamogordo, New Mexico, under the supervision of Groves's deputy Brig. Nuclear weapons tests are experiments carried out to determine the effectiveness yield and explosive capability of Nuclear weapons Throughout the twentieth century most nations Events 622 - The beginning of the Islamic calendar. 1054 - Three Roman legates fractured relations between the Western and Year 1945 ( MCMXLV) was a Common year starting on Monday (link will display the full calendar Alamogordo is a city in Otero County, New Mexico, United States of America. New Mexico ( is a state located in the southwestern region of the United States of America. Gen. Thomas Farrell. General Thomas Francis Farrell ( December 3, 1891 &ndashApril 1967 was the Deputy Commanding General and Chief of Field Operations of the Manhattan Engineer District This test was dubbed by Oppenheimer "Trinity". Trinity was the first test of technology for a Nuclear weapon.

Similar efforts

A similar effort was undertaken in the USSR in September 1941 headed by Igor Kurchatov (with some of Kurchatov's World War II knowledge coming secondhand from Manhattan Project countries, thanks to spies, including at least two on the scientific team at Los Alamos, Klaus Fuchs and Theodore Hall, unknown to each other). The Union of Soviet Socialist Republics (USSR was a constitutionally Socialist state that existed in Eurasia from 1922 to 1991 Igor Vasilyevich Kurchatov (И́горь Васи́льевич Курча́тов January 12, 1903 – February 7, 1960) was a Soviet Klaus Emil Julius Fuchs ( December 29, 1911 &ndash January 28, 1988) was a German -born theoretical physicist and Theodore Alvin Hall ( October 20, 1925  &ndash November 1, 1999) was an American Physicist and an atomic

After the MAUD Committee's report, the British and Americans exchanged nuclear information but initially did not pool their efforts. A British project, code-named Tube Alloys, was started but did not have American resources. Tube Alloys was the code-name for the British Nuclear weapon directorate during World War II, when the very possibility of nuclear weapons was kept at such a high Consequently the British bargaining position worsened, and their motives were mistrusted by the Americans. Collaboration therefore lessened markedly until the Quebec Agreement of August 1943, when a large team of British and Canadian scientists joined the Manhattan Project. The Quebec Agreement was an Anglo - Canadian - American document which outlined the terms of nuclear Nonproliferation between the United Kingdom

The German experimental nuclear pile at Haigerloch
The German experimental nuclear pile at Haigerloch

The question of Axis efforts on the bomb has been a contentious issue for historians. This article is a subarticle of Nuclear power. A nuclear reactor is a device in which Nuclear chain reactions are initiated controlled Haigerloch is a town in the north-western part of the Swabian Alb in Germany. The Axis powers also known as the Axis alliance Axis nations Axis countries or sometimes just the Axis were those Countries It is believed that efforts undertaken in Germany, headed by Werner Heisenberg, and in Japan, were also undertaken during the war with little progress. Werner Heisenberg (5 December 1901 in Würzburg &ndash1 February 1976 in Munich) was a German theoretical physicist best known for enunciating the It was initially feared that Hitler was very close to developing his own bomb. Hi and welcome to Wikipedia! Please understand that this article is frequently vandalized and vandalism is reverted immediately Many German scientists in fact expressed surprise to their Allied captors when the bombs were detonated in Japan. They were convinced that talk of atomic weapons was merely propaganda. However, Werner Heisenberg (by then imprisoned in England at Farm Hall with several other nuclear project physicists) almost immediately figured out what the Allies had done, explaining it to his fellow scientists (and hidden microphones) within days. Operation Epsilon was the Codename of a program in which Allied forces near the end of World War II detained ten German scientists who were thought The Nazi reactor effort had been severely handicapped by Heisenberg's belief that heavy water was necessary as a neutron moderator (slowing preparation material) for such a device. Heavy water is water which contains a higher proportion than normal of the Isotope Deuterium, as deuterium oxide, D2O or ²H2O In Nuclear engineering, a neutron moderator is a medium which reduces the velocity of Fast neutrons thereby turning them into Thermal neutrons capable The Germans were short of heavy water throughout the war because of Allied efforts to prevent Germany from obtaining it, and the Germans never did stumble on the secret of purified graphite for making nuclear reactors from natural uranium.

Bohr, Heisenberg and Fermi were all colleagues who were key figures in developing the quantum theory together with Wolfgang Pauli, prior to the war. Quantum mechanics is the study of mechanical systems whose dimensions are close to the Atomic scale such as Molecules Atoms Electrons They had known each other well in Europe and were friends. Niels Bohr and Heisenberg even discussed the possibility of the atomic bomb prior to and during the war, before the United States became involved. Niels Henrik David Bohr (nels ˈb̥oɐ̯ˀ in Danish 7 October 1885 – 18 November 1962 was a Danish Physicist who made fundamental contributions to understanding Bohr recalled that Heisenberg was unaware that the supercritical mass could be achieved with U-235, and both men gave differing accounts of their conversations at this sensitive time. Bohr at the time did not trust Heisenberg, and never quite forgave him for his decision not to flee Germany before the war when given the chance. Heisenberg, for his part, seems to have thought he was proposing to Bohr a mutual agreement between the two sides not to pursue nuclear technology for destructive purposes. If so, Heisenberg's message did not get through. Heisenberg, to the end of his life, maintained that the partly-built German heavy-water nuclear reactor found after the war's end in his lab was for research purposes only, and a full bomb project had not been contemplated (there is no evidence to contradict this, but by this time late in the war, Germany was far from having the resources for a Hanford-style plutonium bomb, even if its scientists had decided to pursue one and had known how to do it).

Together with the cryptographic efforts centered at Bletchley Park and also at Arlington Hall, the development of radar and computers in the UK and later in the US, and the jet engine in the UK and Germany, the Manhattan Project represents one of the few massive, secret and outstandingly successful technological efforts spawned by the conflict of World War II. Cryptography (or cryptology; from Greek grc κρυπτός kryptos, "hidden secret" and grc γράφω gráphō, "I write" Bletchley Park, also known as Station X, is an estate located in the town of Bletchley, in Buckinghamshire, and (since 1967 part of Milton Keynes Arlington Hall (also called Arlington Hall Station) was the headquarters of the US Army 's Signal Intelligence Service (SIS Cryptography effort Radar is a system that uses electromagnetic waves to identify the range altitude direction or speed of both moving and fixed objects such as Aircraft, ships A computer is a Machine that manipulates data according to a list of instructions. specific --->A jet engine is a Reaction engine that discharges a fast moving jet of Fluid to

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Notes

  1. ^ Hakim, Joy (1995). A History of Us: War, Peace and all that Jazz. New York: Oxford University Press. ISBN 0-19-509514-6.  
  2. ^ Stephen I. Schwartz Atomic Audit: The Costs and Consequences of U. S. Nuclear Weapons. Washington, D. C. : Brookings Institution Press, 1998. Manhattan Project expenditures
  3. ^ "Why They Called It the Manhattan Project" by William J. Broad - New York Times - October 30, 2007
  4. ^ a b c William J. Broad, Why They Called It the Manhattan Project, The New York Times, October 30, 2007
  5. ^ Frisch O. Events 637 - Antioch surrenders to the Muslim forces under Rashidun Caliphate after the Battle of Iron bridge. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. R. : "The Discovery of Fission—How It All Began". Physics Today 20 (1967), 11, pp. 43–48. Wheeler J. A. : "Mechanism of Fission". Physics Today 20 (1967), 11, pp. 49–52
  6. ^ Serber, Robert. The Los Alamos Primer (Los Alamos Report LA-1, compiled April 1943, declassified 1965): p. The Los Alamos Primer was a printed version of the first five lectures on the principles of Nuclear weapons given to new arrivals at the top-secret Los Alamos For the Nickelodeon TV show see Ned's Declassified School Survival Guide. 21.
  7. ^ (Konopinski, C. Marvin, and Teller, Report LA-602, declassified Feb. 1973, PDF
  8. ^ In Bethe's account, the possibility of this ultimate catastrophe came up again in 1975 when it appeared in a magazine article by H. C. Dudley, who got the idea from a report by Pearl Buck of an interview she had with Arthur Compton in 1959. Pearl S Buck ( Traditional Chinese: 賽珍珠 Simplified Chinese: 赛珍珠 Pinyin: Sài Zhēnzhū ( June 26, An interview is a conversation between two or more people (the interviewer and the interviewee where Questions are asked by the interviewer to obtain information from Arthur Holly Compton (September 10 1892 &ndash March 15 1962 was an American physicist and Nobel laureate in physics for his discovery of the Compton effect The worry was not entirely extinguished in some people's minds until the Trinity test. Trinity was the first test of technology for a Nuclear weapon.
  9. ^ "The Manhattan Project", nytimes. com, accessed Nov 2, 2007. Events 1570 - A Tidal wave in the North Sea devastates the coast from Holland to Jutland, killing more than 1000 Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century.
  10. ^ Why They Called It the Manhattan Project, nytimes. com, accessed Nov 2, 2007. Events 1570 - A Tidal wave in the North Sea devastates the coast from Holland to Jutland, killing more than 1000 Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century.
  11. ^ Chris Waltham (20 June 2002). Events 451 - Battle of Chalons: Flavius Aetius ' defeats Attila the Hun. See also 2002 (disambiguation Year 2002 ( MMII) was a Common year starting on Tuesday of the Gregorian calendar. "An Early History of Heavy Water" (PDF). . Department of Physics and Astronomy, University of British Columbia
  12. ^ Natural self-sustaining nuclear reactions have occurred in the distant past (circa two billion years ago); see Natural nuclear fission reactor

References

Overall, administrative, and diplomatic histories of the Manhattan Project
Technical histories
Participant accounts

External links

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