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Click here for more information."><img alt="Featured article" src="//upload.wikimedia.org/wikipedia/en/thumb/e/e7/Cscr-featured.svg/20px-Cscr-featured.svg.png" decoding="async" width="20" height="19" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/e/e7/Cscr-featured.svg/30px-Cscr-featured.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/e/e7/Cscr-featured.svg/40px-Cscr-featured.svg.png 2x" data-file-width="466" data-file-height="443" /></a></div></div> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">1938 achievement in physics</div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Nuclear_fission_reaction.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a8/Nuclear_fission_reaction.svg/300px-Nuclear_fission_reaction.svg.png" decoding="async" width="300" height="167" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a8/Nuclear_fission_reaction.svg/450px-Nuclear_fission_reaction.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a8/Nuclear_fission_reaction.svg/600px-Nuclear_fission_reaction.svg.png 2x" data-file-width="1800" data-file-height="1000" /></a><figcaption>The nuclear reaction theorised by Meitner and Frisch and observed by Hahn and Strassmann</figcaption></figure> <a href="/wiki/Nuclear_fission" title="Nuclear fission">Nuclear fission</a> was discovered in December 1938 by chemists <a href="/wiki/Otto_Hahn" title="Otto Hahn">Otto Hahn</a> and <a href="/wiki/Fritz_Strassmann" title="Fritz Strassmann">Fritz Strassmann</a> and physicists <a href="/wiki/Lise_Meitner" title="Lise Meitner">Lise Meitner</a> and <a href="/wiki/Otto_Robert_Frisch" title="Otto Robert Frisch">Otto Robert Frisch</a>. Fission is a <a href="/wiki/Nuclear_reaction" title="Nuclear reaction">nuclear reaction</a> or <a href="/wiki/Radioactive_decay" title="Radioactive decay">radioactive decay</a> process in which the <a href="/wiki/Atomic_nucleus" title="Atomic nucleus">nucleus</a> of an <a href="/wiki/Atom" title="Atom">atom</a> splits into two or more smaller, lighter nuclei and often other particles. The fission process often produces <a href="/wiki/Gamma_ray" title="Gamma ray">gamma rays</a> and releases a very large amount of energy, even by the energetic standards of radioactive decay. Scientists already knew about <a href="/wiki/Alpha_decay" title="Alpha decay">alpha decay</a> and <a href="/wiki/Beta_decay" title="Beta decay">beta decay</a>, but fission assumed great importance because the discovery that a <a href="/wiki/Nuclear_chain_reaction" title="Nuclear chain reaction">nuclear chain reaction</a> was possible led to the development of <a href="/wiki/Nuclear_power" title="Nuclear power">nuclear power</a> and <a href="/wiki/Nuclear_weapon" title="Nuclear weapon">nuclear weapons</a>. Hahn was awarded the 1944 <a href="/wiki/Nobel_Prize_in_Chemistry" title="Nobel Prize in Chemistry">Nobel Prize in Chemistry</a> for the discovery of nuclear fission. Hahn and Strassmann at the <a href="/wiki/Max_Planck_Institute_for_Chemistry" title="Max Planck Institute for Chemistry">Kaiser Wilhelm Institute for Chemistry</a> in <a href="/wiki/Berlin" title="Berlin">Berlin</a> bombarded <a href="/wiki/Uranium" title="Uranium">uranium</a> with slow <a href="/wiki/Neutron" title="Neutron">neutrons</a> and discovered that <a href="/wiki/Barium" title="Barium">barium</a> had been produced. Hahn suggested a bursting of the nucleus, but he was unsure of what the physical basis for the results were. They reported their findings by mail to Meitner in <a href="/wiki/Sweden" title="Sweden">Sweden</a>, who a few months earlier had fled <a href="/wiki/Nazi_Germany" title="Nazi Germany">Nazi Germany</a>. Meitner and her nephew Frisch theorised, and then proved, that the uranium nucleus had been split and published their findings in <a href="/wiki/Nature_(journal)" title="Nature (journal)">Nature</a>. Meitner calculated that the energy released by each disintegration was approximately 200 <a href="/wiki/Megaelectronvolt" class="mw-redirect" title="Megaelectronvolt">megaelectronvolts</a>, and Frisch observed this. By analogy with the <a href="/wiki/Fission_(biology)" title="Fission (biology)">division of biological cells</a>, he named the process "fission". The discovery came after forty years of investigation into the nature and properties of <a href="/wiki/Radioactivity" class="mw-redirect" title="Radioactivity">radioactivity</a> and radioactive substances. The discovery of the neutron by <a href="/wiki/James_Chadwick" title="James Chadwick">James Chadwick</a> in 1932 created a new means of <a href="/wiki/Nuclear_transmutation" title="Nuclear transmutation">nuclear transmutation</a>. <a href="/wiki/Enrico_Fermi" title="Enrico Fermi">Enrico Fermi</a> and his colleagues in <a href="/wiki/Rome" title="Rome">Rome</a> studied the results of bombarding uranium with neutrons, and Fermi concluded that his experiments had created new elements with 93 and 94 protons, which his group dubbed <a href="/wiki/Ausenium_and_hesperium" title="Ausenium and hesperium">ausenium and hesperium</a>. Fermi won the 1938 <a href="/wiki/Nobel_Prize_in_Physics" title="Nobel Prize in Physics">Nobel Prize in Physics</a> for his "demonstrations of the existence of new radioactive elements produced by neutron irradiation, and for his related discovery of nuclear reactions brought about by slow neutrons".<a href="#cite_note-Fermi_Nobel_Prize-1">[1]</a> However, not everyone was convinced by Fermi's analysis of his results. <a href="/wiki/Ida_Noddack" title="Ida Noddack">Ida Noddack</a> suggested that instead of creating a new, heavier element 93, it was conceivable that the nucleus had broken up into large fragments, and <a href="/wiki/Aristid_von_Grosse" title="Aristid von Grosse">Aristid von Grosse</a> suggested that what Fermi's group had found was an isotope of <a href="/wiki/Protactinium" title="Protactinium">protactinium</a>. This spurred Hahn and Meitner, the discoverers of the most stable <a href="/wiki/Isotope" title="Isotope">isotope</a> of protactinium, to conduct a four-year-long investigation into the process with their colleague Strassmann. After much hard work and many discoveries, they determined that what they were observing was fission, and that the new elements that Fermi had found were <a href="/wiki/Fission_products" class="mw-redirect" title="Fission products">fission products</a>. Their work overturned long-held beliefs in physics and paved the way for the discovery of the real elements 93 (<a href="/wiki/Neptunium" title="Neptunium">neptunium</a>) and 94 (<a href="/wiki/Plutonium" title="Plutonium">plutonium</a>), for the discovery of fission in other elements, and for the determination of the role of the <a href="/wiki/Uranium-235" title="Uranium-235">uranium-235</a> isotope in that of uranium. <a href="/wiki/Niels_Bohr" title="Niels Bohr">Niels Bohr</a> and <a href="/wiki/John_Archibald_Wheeler" title="John Archibald Wheeler">John Wheeler</a> reworked the <a href="/wiki/Liquid_drop_model" class="mw-redirect" title="Liquid drop model">liquid drop model</a> to explain the mechanism of fission. <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Background">Background</h2>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=1" title="Edit section: Background">edit</a>]</div> <div class="mw-heading mw-heading3"><h3 id="Radioactivity">Radioactivity</h3>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=2" title="Edit section: Radioactivity">edit</a>]</div> In the last years of the 19th century, scientists frequently experimented with the <a href="/wiki/Cathode-ray_tube" title="Cathode-ray tube">cathode-ray tube</a>, which by then had become a standard piece of laboratory equipment. A common practice was to aim the <a href="/wiki/Cathode_ray" title="Cathode ray">cathode rays</a> at various substances and to see what happened. <a href="/wiki/Wilhelm_R%C3%B6ntgen" title="Wilhelm Röntgen">Wilhelm Röntgen</a> had a screen coated with <a href="/wiki/Barium" title="Barium">barium</a> <a href="/wiki/Platinocyanide" title="Platinocyanide">platinocyanide</a> that would fluoresce when exposed to cathode rays. On 8 November 1895, he noticed that even though his cathode-ray tube was not pointed at his screen, which was covered in black cardboard, the screen still fluoresced. He soon became convinced that he had discovered a new type of rays, which are today called <a href="/wiki/X-ray" title="X-ray">X-rays</a>. The following year <a href="/wiki/Henri_Becquerel" title="Henri Becquerel">Henri Becquerel</a> was experimenting with fluorescent <a href="/wiki/Uranium" title="Uranium">uranium</a> salts, and wondered if they too might produce X-rays.<a href="#cite_note-FOOTNOTEYruma200829–31-2">[2]</a> On 1 March 1896 he discovered that they did indeed produce rays, but of a different kind, and even when the uranium salt was kept in a dark drawer, it still made an intense image on an X-ray plate, indicating that the rays came from within, and did not require an external energy source.<a href="#cite_note-FOOTNOTERhodes198641–42-3">[3]</a> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Periodisches_System_der_Elemente_(1904-1945,_now_Gdansk_University_of_Technology).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d1/Periodisches_System_der_Elemente_%281904-1945%2C_now_Gdansk_University_of_Technology%29.jpg/220px-Periodisches_System_der_Elemente_%281904-1945%2C_now_Gdansk_University_of_Technology%29.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d1/Periodisches_System_der_Elemente_%281904-1945%2C_now_Gdansk_University_of_Technology%29.jpg/330px-Periodisches_System_der_Elemente_%281904-1945%2C_now_Gdansk_University_of_Technology%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d1/Periodisches_System_der_Elemente_%281904-1945%2C_now_Gdansk_University_of_Technology%29.jpg/440px-Periodisches_System_der_Elemente_%281904-1945%2C_now_Gdansk_University_of_Technology%29.jpg 2x" data-file-width="5184" data-file-height="3888" /></a><figcaption>The <a href="/wiki/Periodic_table" title="Periodic table">periodic table</a> circa 1930</figcaption></figure> Unlike Röntgen's discovery, which was the object of widespread curiosity from scientists and lay people alike for the ability of X-rays to make visible the bones within the human body, Becquerel's discovery made little impact at the time, and Becquerel himself soon moved on to other research.<a href="#cite_note-Badash-4">[4]</a> <a href="/wiki/Marie_Curie" title="Marie Curie">Marie Curie</a> tested samples of as many elements and minerals as she could find for signs of <a href="/wiki/Becquerel" title="Becquerel">Becquerel rays</a>, and in April 1898 also found them in <a href="/wiki/Thorium" title="Thorium">thorium</a>. She gave the phenomenon the name "radioactivity".<a href="#cite_note-5">[5]</a> Along with <a href="/wiki/Pierre_Curie" title="Pierre Curie">Pierre Curie</a> and Gustave Bémont, she began investigating <a href="/wiki/Pitchblende" class="mw-redirect" title="Pitchblende">pitchblende</a>, a uranium-bearing ore, which was found to be more radioactive than the uranium it contained. This indicated the existence of additional radioactive elements. One was chemically akin to <a href="/wiki/Bismuth" title="Bismuth">bismuth</a>, but strongly radioactive, and in July 1898 they published a paper in which they concluded that it was a new element, which they named "<a href="/wiki/Polonium" title="Polonium">polonium</a>". The other was chemically like barium, and in a December 1898 paper they announced the discovery of a second hitherto unknown element, which they called "<a href="/wiki/Radium" title="Radium">radium</a>". Convincing the scientific community was another matter. Separating radium from the barium in the ore proved very difficult. It took three years for them to produce a tenth of a gram of <a href="/wiki/Radium_chloride" title="Radium chloride">radium chloride</a>, and they never did manage to isolate polonium.<a href="#cite_note-6">[6]</a> In 1898, <a href="/wiki/Ernest_Rutherford" title="Ernest Rutherford">Ernest Rutherford</a> noted that thorium gave off a radioactive gas. In examining the radiation, he classified Becquerel radiation into two types, which he called α (alpha) and β (beta) radiation.<a href="#cite_note-7">[7]</a> Subsequently, <a href="/wiki/Paul_Villard" class="mw-redirect" title="Paul Villard">Paul Villard</a> discovered a third type of Becquerel radiation which, following Rutherford's scheme, were called "<a href="/wiki/Gamma_ray" title="Gamma ray">gamma rays</a>", and Curie noted that radium also produced a radioactive gas. Identifying the gas chemically proved frustrating; Rutherford and <a href="/wiki/Frederick_Soddy" title="Frederick Soddy">Frederick Soddy</a> found it to be inert, much like <a href="/wiki/Argon" title="Argon">argon</a>. It later came to be known as <a href="/wiki/Radon" title="Radon">radon</a>. Rutherford identified beta rays as cathode rays (electrons), and hypothesised—and in 1909 with <a href="/wiki/Thomas_Royds" title="Thomas Royds">Thomas Royds</a> proved—that alpha particles were <a href="/wiki/Helium" title="Helium">helium</a> nuclei.<a href="#cite_note-FOOTNOTERhodes198642–43-8">[8]</a><a href="#cite_note-9">[9]</a> Observing the radioactive disintegration of elements, Rutherford and Soddy classified the radioactive products according to their characteristic rates of decay, introducing the concept of a <a href="/wiki/Half-life" title="Half-life">half-life</a>.<a href="#cite_note-FOOTNOTERhodes198642–43-8">[8]</a><a href="#cite_note-10">[10]</a> In 1903, Soddy and <a href="/wiki/Margaret_Todd_(doctor)" title="Margaret Todd (doctor)">Margaret Todd</a> applied the term "<a href="/wiki/Isotope" title="Isotope">isotope</a>" to atoms that were chemically and spectroscopically identical but had different radioactive half-lives.<a href="#cite_note-11">[11]</a><a href="#cite_note-12">[12]</a> Rutherford proposed a model of the <a href="/wiki/Atom" title="Atom">atom</a> in which a very small, dense and positively charged <a href="/wiki/Atomic_nucleus" title="Atomic nucleus">nucleus</a> of <a href="/wiki/Proton" title="Proton">protons</a> was surrounded by orbiting, negatively charged electrons (the <a href="/wiki/Rutherford_model" title="Rutherford model">Rutherford model</a>).<a href="#cite_note-13">[13]</a> <a href="/wiki/Niels_Bohr" title="Niels Bohr">Niels Bohr</a> improved upon this in 1913 by reconciling it with the <a href="/wiki/Quantum" title="Quantum">quantum</a> behaviour of electrons (the <a href="/wiki/Bohr_model" title="Bohr model">Bohr model</a>).<a href="#cite_note-14">[14]</a><a href="#cite_note-Bohr_1913_476-15">[15]</a><a href="#cite_note-16">[16]</a> <div class="mw-heading mw-heading3"><h3 id="Protactinium">Protactinium</h3>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=3" title="Edit section: Protactinium">edit</a>]</div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Decay_Chain_of_Actinium.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/93/Decay_Chain_of_Actinium.svg/170px-Decay_Chain_of_Actinium.svg.png" decoding="async" width="170" height="314" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/93/Decay_Chain_of_Actinium.svg/255px-Decay_Chain_of_Actinium.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/93/Decay_Chain_of_Actinium.svg/340px-Decay_Chain_of_Actinium.svg.png 2x" data-file-width="1310" data-file-height="2420" /></a><figcaption>The decay chain of actinium. <a href="/wiki/Alpha_decay" title="Alpha decay">Alpha decay</a> shifts two elements down; <a href="/wiki/Beta_decay" title="Beta decay">beta decay</a> shifts one element up.</figcaption></figure> Soddy and <a href="/wiki/Kasimir_Fajans" class="mw-redirect" title="Kasimir Fajans">Kasimir Fajans</a> independently observed in 1913 that alpha decay caused atoms to shift down two places in the <a href="/wiki/Periodic_table" title="Periodic table">periodic table</a>, while the loss of two beta particles restored it to its original position. In the resulting reorganisation of the periodic table, radium was placed in group II, <a href="/wiki/Actinium" title="Actinium">actinium</a> in group III, thorium in group IV and uranium in group VI. This left a gap between thorium and uranium. Soddy predicted that this unknown element, which he referred to (after <a href="/wiki/Dmitri_Mendeleev" title="Dmitri Mendeleev">Dmitri Mendeleev</a>) as "ekatantalium", would be an alpha emitter with chemical properties similar to tantalium (now known as <a href="/wiki/Tantalum" title="Tantalum">tantalum</a>).<a href="#cite_note-Discovery_of_Protactinium-17">[17]</a><a href="#cite_note-18">[18]</a><a href="#cite_note-19">[19]</a> It was not long before Fajans and <a href="/wiki/Oswald_Helmuth_G%C3%B6hring" title="Oswald Helmuth Göhring">Oswald Helmuth Göhring</a> discovered it as a decay product of a beta-emitting product of thorium. Based on the <a href="/wiki/Radioactive_displacement_law_of_Fajans_and_Soddy" title="Radioactive displacement law of Fajans and Soddy">radioactive displacement law of Fajans and Soddy</a>, this was an isotope of the missing element, which they named "brevium" after its short half-life. However, it was a beta emitter, and therefore could not be the mother isotope of actinium. This had to be another isotope.<a href="#cite_note-Discovery_of_Protactinium-17">[17]</a> Two scientists at the <a href="/wiki/Kaiser_Wilhelm_Society" title="Kaiser Wilhelm Society">Kaiser Wilhelm Institute (KWI)</a> in <a href="/wiki/Dahlem_(Berlin)" title="Dahlem (Berlin)">Berlin-Dahlem</a> took up the challenge of finding the missing isotope. <a href="/wiki/Otto_Hahn" title="Otto Hahn">Otto Hahn</a> had graduated from the <a href="/wiki/University_of_Marburg" title="University of Marburg">University of Marburg</a> as an organic chemist, but had been a post-doctoral researcher at <a href="/wiki/University_College_London" title="University College London">University College London</a> under Sir <a href="/wiki/William_Ramsay" title="William Ramsay">William Ramsay</a>, and under Rutherford at <a href="/wiki/McGill_University" title="McGill University">McGill University</a>, where he had studied radioactive isotopes. In 1906, he returned to Germany, where he became an assistant to <a href="/wiki/Emil_Fischer" title="Emil Fischer">Emil Fischer</a> at the <a href="/wiki/University_of_Berlin" class="mw-redirect" title="University of Berlin">University of Berlin</a>. At McGill he had become accustomed to working closely with a physicist, so he teamed up with <a href="/wiki/Lise_Meitner" title="Lise Meitner">Lise Meitner</a>, who had received her doctorate from the <a href="/wiki/University_of_Vienna" title="University of Vienna">University of Vienna</a> in 1906, and had then moved to Berlin to study physics under <a href="/wiki/Max_Planck" title="Max Planck">Max Planck</a> at the <a href="/wiki/Humboldt_University_of_Berlin" title="Humboldt University of Berlin">Friedrich-Wilhelms-Universität</a>. Meitner found Hahn, who was her own age, less intimidating than older, more distinguished colleagues.<a href="#cite_note-FOOTNOTEYruma200839–42-20">[20]</a> Hahn and Meitner moved to the recently established Kaiser Wilhelm Institute for Chemistry in 1913, and by 1920 had become the heads of their own laboratories there, with their own students, research programs and equipment.<a href="#cite_note-FOOTNOTEYruma200839–42-20">[20]</a> The new laboratories offered new opportunities, as the old ones had become too contaminated with radioactive substances to investigate feebly radioactive substances. They developed a new technique for separating the tantalum group from pitchblende, which they hoped would speed the isolation of the new isotope.<a href="#cite_note-Discovery_of_Protactinium-17">[17]</a> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Hahn_and_Meitner_in_1912.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Hahn_and_Meitner_in_1912.jpg/290px-Hahn_and_Meitner_in_1912.jpg" decoding="async" width="290" height="143" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Hahn_and_Meitner_in_1912.jpg/435px-Hahn_and_Meitner_in_1912.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/73/Hahn_and_Meitner_in_1912.jpg/580px-Hahn_and_Meitner_in_1912.jpg 2x" data-file-width="1362" data-file-height="670" /></a><figcaption>Otto Hahn and Lise Meitner in 1912</figcaption></figure> The work was interrupted by the outbreak of the <a href="/wiki/First_World_War" class="mw-redirect" title="First World War">First World War</a> in 1914. Hahn was called up into the German Army, and Meitner became a volunteer <a href="/wiki/Radiographer" title="Radiographer">radiographer</a> in Austrian Army hospitals.<a href="#cite_note-21">[21]</a> She returned to the Kaiser Wilhelm Institute in October 1916. Hahn joined the new gas command unit at Imperial Headquarters in Berlin in December 1916 after travelling between the western and eastern fronts, Berlin and Leverkusen between the summer of 1914 and late 1916.<a href="#cite_note-FOOTNOTESime199657–61-22">[22]</a> Most of the students, laboratory assistants and technicians had been called up, so Hahn, who was stationed in Berlin between January and September 1917,<a href="#cite_note-FOOTNOTEHahn1966117–132-23">[23]</a> and Meitner had to do everything themselves. By December 1917 she was able to isolate the substance, and after further work were able to prove that it was indeed the missing isotope. Meitner submitted her and Hahn's findings for publication in March 1918 to the scientific paper <a href="/wiki/Physikalische_Zeitschrift" title="Physikalische Zeitschrift">Physikalischen Zeitschrift</a> under the title Die Muttersubstanz des Actiniums; ein neues radioaktives Element von langer Lebensdauer.<a href="#cite_note-Discovery_of_Protactinium-17">[17]</a><a href="#cite_note-24">[24]</a> Although Fajans and Göhring had been the first to discover the element, custom required that an element was represented by its longest-lived and most abundant isotope, and brevium did not seem appropriate. Fajans agreed to Meitner and Hahn naming the element <a href="/wiki/Protactinium" title="Protactinium">protactinium</a>, and assigning it the chemical symbol Pa. In June 1918, Soddy and <a href="/wiki/John_Arnold_Cranston" title="John Arnold Cranston">John Cranston</a> announced that they had extracted a sample of the isotope, but unlike Hahn and Meitner were unable to describe its characteristics. They acknowledged Hahn's and Meitner's priority, and agreed to the name. The connection to uranium remained a mystery, as neither of the known <a href="/wiki/Isotopes_of_uranium" title="Isotopes of uranium">isotopes of uranium</a> decayed into protactinium. It remained unsolved until <a href="/wiki/Uranium-235" title="Uranium-235">uranium-235</a> was discovered in 1929.<a href="#cite_note-Discovery_of_Protactinium-17">[17]</a><a href="#cite_note-25">[25]</a> For their discovery Hahn and Meitner were repeatedly nominated for the Nobel Prize in Chemistry in the 1920s by several scientists, among them Max Planck, <a href="/wiki/Heinrich_Jacob_Goldschmidt" title="Heinrich Jacob Goldschmidt">Heinrich Goldschmidt</a>, and Fajans himself.<a href="#cite_note-Hahn_nominations-26">[26]</a><a href="#cite_note-Meitner_nominations-27">[27]</a> In 1949, the International Union of Pure and Applied Chemistry (<a href="/wiki/IUPAC" class="mw-redirect" title="IUPAC">IUPAC</a>) named the new element definitively protactinium, and confirmed Hahn and Meitner as discoverers.<a href="#cite_note-28">[28]</a> <div class="mw-heading mw-heading2"><h2 id="Transmutation">Transmutation</h2>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=4" title="Edit section: Transmutation">edit</a>]</div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Ir%C3%A8ne_et_Fr%C3%A9d%C3%A9ric_Joliot-Curie_1935.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/Ir%C3%A8ne_et_Fr%C3%A9d%C3%A9ric_Joliot-Curie_1935.jpg/290px-Ir%C3%A8ne_et_Fr%C3%A9d%C3%A9ric_Joliot-Curie_1935.jpg" decoding="async" width="290" height="199" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/Ir%C3%A8ne_et_Fr%C3%A9d%C3%A9ric_Joliot-Curie_1935.jpg/435px-Ir%C3%A8ne_et_Fr%C3%A9d%C3%A9ric_Joliot-Curie_1935.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/32/Ir%C3%A8ne_et_Fr%C3%A9d%C3%A9ric_Joliot-Curie_1935.jpg/580px-Ir%C3%A8ne_et_Fr%C3%A9d%C3%A9ric_Joliot-Curie_1935.jpg 2x" data-file-width="1334" data-file-height="914" /></a><figcaption><a href="/wiki/Ir%C3%A8ne_Curie" class="mw-redirect" title="Irène Curie">Irène Curie</a> and <a href="/wiki/Fr%C3%A9d%C3%A9ric_Joliot" class="mw-redirect" title="Frédéric Joliot">Frédéric Joliot</a> in their Paris laboratory in 1935</figcaption></figure> <a href="/wiki/Patrick_Blackett" title="Patrick Blackett">Patrick Blackett</a> was able to accomplish <a href="/wiki/Nuclear_transmutation" title="Nuclear transmutation">nuclear transmutation</a> of nitrogen into oxygen in 1925, using alpha particles directed at nitrogen. In modern notation for the atomic nuclei, the reaction was: <dl><dd>14 7N + 4 2He → 17 8O + p</dd></dl> This was the first observation of a <a href="/wiki/Nuclear_reaction" title="Nuclear reaction">nuclear reaction</a>, that is, a reaction in which particles from one decay are used to transform another atomic nucleus.<a href="#cite_note-29">[29]</a> A fully artificial nuclear reaction and nuclear transmutation was achieved in April 1932 by <a href="/wiki/Ernest_Walton" title="Ernest Walton">Ernest Walton</a> and <a href="/wiki/John_Cockcroft" title="John Cockcroft">John Cockcroft</a>, who used artificially accelerated protons against <a href="/wiki/Lithium" title="Lithium">lithium</a>, to break this nucleus into two alpha particles. The feat was popularly known as "splitting the atom", but was not <a href="/wiki/Nuclear_fission" title="Nuclear fission">nuclear fission</a>;<a href="#cite_note-30">[30]</a><a href="#cite_note-31">[31]</a> as it was not the result of initiating an internal <a href="/wiki/Radioactive_decay" title="Radioactive decay">radioactive decay</a> process.<a href="#cite_note-32">[32]</a> Just a few weeks before Cockcroft and Walton's feat, another scientist at the <a href="/wiki/Cavendish_Laboratory" title="Cavendish Laboratory">Cavendish Laboratory</a>, <a href="/wiki/James_Chadwick" title="James Chadwick">James Chadwick</a>, discovered the <a href="/wiki/Neutron" title="Neutron">neutron</a>, using an ingenious device made with <a href="/wiki/Sealing_wax" title="Sealing wax">sealing wax</a>, through the reaction of <a href="/wiki/Beryllium" title="Beryllium">beryllium</a> with alpha particles:<a href="#cite_note-FOOTNOTERhodes198639,_160–167,_793-33">[33]</a><a href="#cite_note-34">[34]</a> <dl><dd>9 4Be + 4 2He → 12 6C + n</dd></dl> <a href="/wiki/Ir%C3%A8ne_Curie" class="mw-redirect" title="Irène Curie">Irène Curie</a> and <a href="/wiki/Fr%C3%A9d%C3%A9ric_Joliot" class="mw-redirect" title="Frédéric Joliot">Frédéric Joliot</a> irradiated aluminium foil with alpha particles and found that this results in a short-lived radioactive <a href="/wiki/Isotopes_of_phosphorus" title="Isotopes of phosphorus">isotope of phosphorus</a> with a half-life of around three minutes: <dl><dd>27 13Al + 4 2He → 30 15P + n</dd></dl> which then decays to a stable isotope of <a href="/wiki/Silicon" title="Silicon">silicon</a> <dl><dd>30 15P → 30 14Si + e+</dd></dl> They noted that radioactivity continued after the neutron emissions ceased. Not only had they discovered a new form of radioactive decay in the form of <a href="/wiki/Positron_emission" title="Positron emission">positron emission</a>, they had transmuted an element into a hitherto unknown radioactive isotope of another, thereby inducing radioactivity where there had been none before. Radiochemistry was now no longer confined to certain heavy elements, but extended to the entire periodic table.<a href="#cite_note-FOOTNOTERhodes1986200–201-35">[35]</a><a href="#cite_note-FOOTNOTESime1996161–162-36">[36]</a><a href="#cite_note-37">[37]</a> Chadwick noted that being electrically neutral, neutrons would be able to penetrate the nucleus more easily than protons or alpha particles.<a href="#cite_note-The_History_of_the_Discovery_of_Nuclear_Fission-38">[38]</a> <a href="/wiki/Enrico_Fermi" title="Enrico Fermi">Enrico Fermi</a> and his colleagues in <a href="/wiki/Rome" title="Rome">Rome</a>—<a href="/wiki/Edoardo_Amaldi" title="Edoardo Amaldi">Edoardo Amaldi</a>, <a href="/wiki/Oscar_D%27Agostino" title="Oscar D'Agostino">Oscar D'Agostino</a>, <a href="/wiki/Franco_Rasetti" title="Franco Rasetti">Franco Rasetti</a> and <a href="/wiki/Emilio_Segr%C3%A8" title="Emilio Segrè">Emilio Segrè</a>—picked up on this idea.<a href="#cite_note-FOOTNOTERhodes1986210–211-39">[39]</a> Rasetti visited Meitner's laboratory in 1931, and again in 1932 after Chadwick's discovery of the neutron. Meitner showed him how to prepare a polonium-beryllium neutron source. On returning to Rome, Rasetti built <a href="/wiki/Geiger_counter" title="Geiger counter">Geiger counters</a> and a <a href="/wiki/Cloud_chamber" title="Cloud chamber">cloud chamber</a> modelled after Meitner's. Fermi initially intended to use polonium as a source of alpha particles, as Chadwick and Curie had done. Radon was a stronger source of alpha particles than polonium, but it also emitted beta and gamma rays, which played havoc with the detection equipment in the laboratory. But Rasetti went on his Easter vacation without preparing the polonium-beryllium source, and Fermi realised that since he was interested in the products of the reaction, he could irradiate his sample in one laboratory and test it in another down the hall. The neutron source was easy to prepare by mixing with powdered beryllium in a sealed capsule. Moreover, radon was easily obtained; <a href="/w/index.php?title=Giulio_Cesare_Trabacchi&action=edit&redlink=1" class="new" title="Giulio Cesare Trabacchi (page does not exist)">Giulio Cesare Trabacchi</a> had more than a gram of radium and was happy to supply Fermi with radon. With a half-life of only 3.82 days it would only go to waste otherwise, and the radium continually produced more.<a href="#cite_note-FOOTNOTERhodes1986210–211-39">[39]</a><a href="#cite_note-FOOTNOTESime1996162–163-40">[40]</a> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Ragazzi_di_via_Panisperna_cropped.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4d/Ragazzi_di_via_Panisperna_cropped.jpg/220px-Ragazzi_di_via_Panisperna_cropped.jpg" decoding="async" width="220" height="241" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4d/Ragazzi_di_via_Panisperna_cropped.jpg/330px-Ragazzi_di_via_Panisperna_cropped.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4d/Ragazzi_di_via_Panisperna_cropped.jpg/440px-Ragazzi_di_via_Panisperna_cropped.jpg 2x" data-file-width="558" data-file-height="612" /></a><figcaption>Enrico Fermi and his research group (the <a href="/wiki/Via_Panisperna_boys" title="Via Panisperna boys">Via Panisperna boys</a>), circa 1934. Left to right: <a href="/wiki/Oscar_D%27Agostino" title="Oscar D'Agostino">Oscar D'Agostino</a>, <a href="/wiki/Emilio_Segr%C3%A8" title="Emilio Segrè">Emilio Segrè</a>, <a href="/wiki/Edoardo_Amaldi" title="Edoardo Amaldi">Edoardo Amaldi</a>, <a href="/wiki/Franco_Rasetti" title="Franco Rasetti">Franco Rasetti</a> and Fermi </figcaption></figure> Working in assembly-line fashion, they started by irradiating water, and then progressed up the periodic table through lithium, beryllium, <a href="/wiki/Boron" title="Boron">boron</a> and <a href="/wiki/Carbon" title="Carbon">carbon</a>, without inducing any radioactivity. When they got to <a href="/wiki/Aluminium" title="Aluminium">aluminium</a> and then <a href="/wiki/Fluorine" title="Fluorine">fluorine</a>, they had their first successes. Induced radioactivity was ultimately found through the neutron bombardment of 22 different elements.<a href="#cite_note-41">[41]</a><a href="#cite_note-42">[42]</a> Meitner was one of the select group of physicists to whom Fermi mailed advance copies of his papers, and she was able to report that she had verified his findings with respect to aluminium, silicon, phosphorus, copper and zinc.<a href="#cite_note-FOOTNOTESime1996162–163-40">[40]</a> When a new copy of La Ricerca Scientifica arrived at the Niels Bohr's <a href="/wiki/Niels_Bohr_Institute" title="Niels Bohr Institute">Institute for Theoretical Physics</a> at the <a href="/wiki/University_of_Copenhagen" title="University of Copenhagen">University of Copenhagen</a>, her nephew, <a href="/wiki/Otto_Frisch" class="mw-redirect" title="Otto Frisch">Otto Frisch</a>, as the only physicist there who could read Italian, found himself in demand from colleagues wanting a translation. The Rome group had no samples of the <a href="/wiki/Rare_earth_metals" class="mw-redirect" title="Rare earth metals">rare earth metals</a>, but at Bohr's institute <a href="/wiki/George_de_Hevesy" title="George de Hevesy">George de Hevesy</a> had a complete set of their oxides that had been given to him by <a href="/wiki/Auergesellschaft" title="Auergesellschaft">Auergesellschaft</a>, so de Hevesy and <a href="/wiki/Hilde_Levi" title="Hilde Levi">Hilde Levi</a> carried out the process with them.<a href="#cite_note-FOOTNOTEFrisch197988–89-43">[43]</a> When the Rome group reached uranium, they had a problem: the radioactivity of natural uranium was almost as great as that of their neutron source.<a href="#cite_note-Discovery_of_Nuclear_Fission-44">[44]</a> What they observed was a complex mixture of half-lives. Following the displacement law, they checked for the presence of <a href="/wiki/Lead" title="Lead">lead</a>, bismuth, radium, actinium, thorium and protactinium (skipping the elements whose chemical properties were unknown), and (correctly) found no indication of any of them.<a href="#cite_note-Discovery_of_Nuclear_Fission-44">[44]</a> Fermi noted three types of reactions were caused by neutron irradiation: emission of an alpha particle (n, α); <a href="/wiki/Proton_emission" title="Proton emission">proton emission</a> (n, p); and gamma emission (n, γ). Invariably, the new isotopes decayed by beta emission, which caused elements to move up the periodic table.<a href="#cite_note-FOOTNOTESime1996164-45">[45]</a> Based on the periodic table of the time, Fermi believed that element 93 was ekarhenium—the element below rhenium—with characteristics similar to <a href="/wiki/Manganese" title="Manganese">manganese</a> and <a href="/wiki/Rhenium" title="Rhenium">rhenium</a>. Such an element was found, and Fermi tentatively concluded that his experiments had created new elements with 93 and 94 protons,<a href="#cite_note-Nature_1934-46">[46]</a> which he dubbed <a href="/wiki/Ausenium_and_hesperium" title="Ausenium and hesperium">ausenium and hesperium</a>.<a href="#cite_note-FOOTNOTEYruma200846–47-47">[47]</a><a href="#cite_note-FOOTNOTEAmaldi2001153–156-48">[48]</a> The results were published in <a href="/wiki/Nature_(journal)" title="Nature (journal)">Nature</a> in June 1934.<a href="#cite_note-Nature_1934-46">[46]</a> However, in this paper Fermi cautioned that "a careful search for such heavy particles has not yet been carried out, as they require for their observation that the active product should be in the form of a very thin layer. It seems therefore at present premature to form any definite hypothesis on the chain of disintegrations involved."<a href="#cite_note-Nature_1934-46">[46]</a> In retrospect, what they had detected was indeed an unknown rhenium-like element, <a href="/wiki/Technetium" title="Technetium">technetium</a>, which lies between manganese and rhenium on the periodic table.<a href="#cite_note-Discovery_of_Nuclear_Fission-44">[44]</a> <a href="/wiki/Leo_Szilard" title="Leo Szilard">Leo Szilard</a> and Thomas A. Chalmers reported that neutrons generated by gamma rays acting on beryllium were captured by iodine, a reaction that Fermi had also noted. When Meitner repeated their experiment, she found that neutrons from the gamma-beryllium sources were captured by heavy elements like iodine, silver and gold, but not by lighter ones like sodium, aluminium and silicon. She concluded that slow neutrons were more likely to be captured than fast ones, a finding she reported to Naturwissenschaften in October 1934.<a href="#cite_note-FOOTNOTESime1996166-49">[49]</a><a href="#cite_note-50">[50]</a> Everyone had been thinking that energetic neutrons were required, as was the case with alpha particles and protons, but that was required to overcome the <a href="/wiki/Coulomb_barrier" title="Coulomb barrier">Coulomb barrier</a>; the neutrally charged neutrons were more likely to be captured by the nucleus if they spent more time in its vicinity. A few days later, Fermi considered a curiosity that his group had noted: uranium seemed to react differently in different parts of the laboratory; neutron irradiation conducted on a wooden table induced more radioactivity than on a marble table in the same room. Fermi thought about this and tried placing a piece of <a href="/wiki/Paraffin_wax" title="Paraffin wax">paraffin wax</a> between the neutron source and the uranium. This resulted in a dramatic increase in activity. He reasoned that the neutrons had been slowed by collisions with hydrogen atoms in the paraffin and wood.<a href="#cite_note-FOOTNOTERhodes1986217–219-51">[51]</a> The departure of D'Agostino meant that the Rome group no longer had a chemist, and the subsequent loss of Rasetti and Segrè reduced the group to just Fermi and Amaldi, who abandoned the research into transmutation to concentrate on exploring the physics of slow neutrons.<a href="#cite_note-Discovery_of_Nuclear_Fission-44">[44]</a> The current model of the nucleus in 1934 was the <a href="/wiki/Liquid_drop_model" class="mw-redirect" title="Liquid drop model">liquid drop model</a> first proposed by <a href="/wiki/George_Gamow" title="George Gamow">George Gamow</a> in 1930.<a href="#cite_note-52">[52]</a> His simple and elegant model was refined and developed by <a href="/wiki/Carl_Friedrich_von_Weizs%C3%A4cker" title="Carl Friedrich von Weizsäcker">Carl Friedrich von Weizsäcker</a> and, after the discovery of the neutron, by <a href="/wiki/Werner_Heisenberg" title="Werner Heisenberg">Werner Heisenberg</a> in 1935 and Niels Bohr in 1936, it agreed closely with observations. In the model, the <a href="/wiki/Nucleon" title="Nucleon">nucleons</a> were held together in the smallest possible volume (a sphere) by the <a href="/wiki/Strong_nuclear_force" class="mw-redirect" title="Strong nuclear force">strong nuclear force</a>, which was capable of overcoming the longer ranged <a href="/wiki/Coulomb%27s_law" title="Coulomb's law">Coulomb electrical repulsion</a> between the protons. The model remained in use for certain applications into the 21st century, when it attracted the attention of mathematicians interested in its properties,<a href="#cite_note-Gamow's_Liquid_Drops-53">[53]</a><a href="#cite_note-54">[54]</a><a href="#cite_note-55">[55]</a> but in its 1934 form it confirmed what physicists thought they already knew: that nuclei were static, and that the odds of a collision chipping off more than an alpha particle were practically zero.<a href="#cite_note-Belated_Discovery_of_fission-56">[56]</a> <div class="mw-heading mw-heading2"><h2 id="Discovery">Discovery</h2>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=5" title="Edit section: Discovery">edit</a>]</div> <div class="mw-heading mw-heading3"><h3 id="Objections">Objections</h3>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=6" title="Edit section: Objections">edit</a>]</div> Fermi won the 1938 <a href="/wiki/Nobel_Prize_in_Physics" title="Nobel Prize in Physics">Nobel Prize in Physics</a> for his "demonstrations of the existence of new radioactive elements produced by neutron irradiation, and for his related discovery of nuclear reactions brought about by slow neutrons".<a href="#cite_note-Fermi_Nobel_Prize-1">[1]</a> However, not everyone was convinced by Fermi's analysis of his results. <a href="/wiki/Ida_Noddack" title="Ida Noddack">Ida Noddack</a> suggested in September 1934 that instead of creating a new, heavier element 93, that: <style data-mw-deduplicate="TemplateStyles:r1244412712">.mw-parser-output .templatequote{overflow:hidden;margin:1em 0;padding:0 32px}.mw-parser-output .templatequotecite{line-height:1.5em;text-align:left;margin-top:0}@media(min-width:500px){.mw-parser-output .templatequotecite{padding-left:1.6em}}</style><blockquote class="templatequote">One could assume equally well that when neutrons are used to produce nuclear disintegrations, some distinctly new nuclear reactions take place which have not been observed previously with proton or alpha-particle bombardment of atomic nuclei. In the past one has found that transmutations of nuclei only take place with the emission of electrons, protons, or helium nuclei, so that the heavy elements change their mass only a small amount to produce near neighbouring elements. When heavy nuclei are bombarded by neutrons, it is conceivable that the nucleus breaks up into several large fragments, which would of course be isotopes of known elements but would not be neighbours of the irradiated element.<a href="#cite_note-57">[57]</a></blockquote> Noddack's article was read by Fermi's team in Rome, Curie and Joliot in Paris, and Meitner and Hahn in Berlin.<a href="#cite_note-Discovery_of_Nuclear_Fission-44">[44]</a> However, the quoted objection comes some distance down, and is but one of several gaps she noted in Fermi's claim.<a href="#cite_note-FOOTNOTEHook2002139–141-58">[58]</a> Bohr's liquid drop model had not yet been formulated, so there was no theoretical way to calculate whether it was physically possible for the uranium atoms to break into large pieces.<a href="#cite_note-FOOTNOTELibby197943-59">[59]</a> Noddack and her husband, <a href="/wiki/Walter_Noddack" title="Walter Noddack">Walter Noddack</a>, were renowned chemists who had been nominated for the <a href="/wiki/Nobel_Prize_in_Chemistry" title="Nobel Prize in Chemistry">Nobel Prize in Chemistry</a> for the discovery of rhenium, although at the time they were also embroiled in a controversy over the discovery of element 43, which they called "masurium". The discovery of technetium by Emilio Segrè and <a href="/wiki/Carlo_Perrier" title="Carlo Perrier">Carlo Perrier</a> put an end to their claim, but did not occur until 1937. It is unlikely that Meitner or Curie had any prejudice against Noddack because of her sex,<a href="#cite_note-FOOTNOTEHook2002130–132-60">[60]</a> but Meitner was not afraid to tell Hahn Hähnchen, von Physik verstehst Du Nichts ("Hahn dear, of physics you understand nothing").<a href="#cite_note-Lise_Meitner_and_the_Discovery_of_Fission-61">[61]</a> The same attitude carried over to Noddack, who did not propose an alternative nuclear model, nor conduct experiments to support her claim. Although Noddack was a renowned analytical chemist, she lacked the background in physics to appreciate the enormity of what she was proposing.<a href="#cite_note-FOOTNOTEHook2002139–141-58">[58]</a> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Dahlem_Thielallee_Hahn-Meitner-Bau.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1f/Dahlem_Thielallee_Hahn-Meitner-Bau.JPG/220px-Dahlem_Thielallee_Hahn-Meitner-Bau.JPG" decoding="async" width="220" height="154" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1f/Dahlem_Thielallee_Hahn-Meitner-Bau.JPG/330px-Dahlem_Thielallee_Hahn-Meitner-Bau.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1f/Dahlem_Thielallee_Hahn-Meitner-Bau.JPG/440px-Dahlem_Thielallee_Hahn-Meitner-Bau.JPG 2x" data-file-width="2354" data-file-height="1653" /></a><figcaption>Former Kaiser Wilhelm Institute for Chemistry building in Berlin. After the Second World War it became part of the <a href="/wiki/Free_University_of_Berlin" title="Free University of Berlin">Free University of Berlin</a>. It was renamed the Otto Hahn Building in 1956, and the Hahn-Meitner Building in 2010.<a href="#cite_note-FOOTNOTESime1996368-62">[62]</a><a href="#cite_note-63">[63]</a> </figcaption></figure> Noddack was not the only critic of Fermi's claim. <a href="/wiki/Aristid_von_Grosse" title="Aristid von Grosse">Aristid von Grosse</a> suggested that what Fermi had found was an isotope of protactinium.<a href="#cite_note-64">[64]</a><a href="#cite_note-65">[65]</a> Meitner was eager to investigate Fermi's results, but she recognised that a highly skilled chemist was required, and she wanted the best one she knew: Hahn, although they had not collaborated for many years. Initially, Hahn was not interested, but von Grosse's mention of protactinium changed his mind.<a href="#cite_note-FOOTNOTESime1996164–165-66">[66]</a> "The only question", Hahn later wrote, "seemed to be whether Fermi had found isotopes of transuranian elements, or isotopes of the next-lower element, protactinium. At that time Lise Meitner and I decided to repeat Fermi's experiments in order to find out whether the 13-minute isotope was a protactinium isotope or not. It was a logical decision, having been the discoverers of protactinium."<a href="#cite_note-FOOTNOTEHahn1966140–141-67">[67]</a> Hahn and Meitner were joined by <a href="/wiki/Fritz_Strassmann" title="Fritz Strassmann">Fritz Strassmann</a>. Strassmann had received his doctorate in analytical chemistry from the <a href="/wiki/Technical_University_of_Hannover" class="mw-redirect" title="Technical University of Hannover">Technical University of Hannover</a> in 1929,<a href="#cite_note-68">[68]</a> and had come to the Kaiser Wilhelm Institute for Chemistry to study under Hahn, believing that this would improve his employment prospects. He enjoyed the work and the people so much that he stayed on after his stipend expired in 1932. After the <a href="/wiki/Nazi_Party" title="Nazi Party">Nazi Party</a> came to power in Germany in 1933, he declined a lucrative offer of employment because it required political training and Nazi Party membership, and he resigned from the <a href="/wiki/Society_of_German_Chemists" class="mw-redirect" title="Society of German Chemists">Society of German Chemists</a> when it became part of the Nazi <a href="/wiki/German_Labour_Front" title="German Labour Front">German Labour Front</a>. As a result, he could neither work in the chemical industry nor receive his <a href="/wiki/Habilitation#Germany" title="Habilitation">habilitation</a>, which was required to become an independent researcher in Germany. Meitner persuaded Hahn to hire Strassmann using money from the director's special circumstances fund. In 1935, Strassmann became an assistant on half pay. Soon he would be credited as a collaborator on the papers they produced.<a href="#cite_note-FOOTNOTESime1996156–157,_169-69">[69]</a> The 1933 <a href="/wiki/Law_for_the_Restoration_of_the_Professional_Civil_Service" title="Law for the Restoration of the Professional Civil Service">Law for the Restoration of the Professional Civil Service</a> removed Jewish people from the civil service, which included academia. Meitner never tried to conceal her Jewish descent, but initially was exempt from its impact on multiple grounds: she had been employed before 1914, had served in the military during the World War, was an Austrian rather than a German citizen, and the Kaiser Wilhelm Institute was a government-industry partnership.<a href="#cite_note-FOOTNOTESime1996138–139-70">[70]</a> However, she was dismissed from her adjunct professorship at the University of Berlin on the grounds that her World War I service was not at the front, and she had not completed her habilitation until 1922.<a href="#cite_note-FOOTNOTESime1996150-71">[71]</a> <a href="/wiki/Carl_Bosch" title="Carl Bosch">Carl Bosch</a>, the director of <a href="/wiki/IG_Farben" title="IG Farben">IG Farben</a>, a major sponsor of the Kaiser Wilhelm Institute for Chemistry, assured Meitner that her position there was safe, and she agreed to stay.<a href="#cite_note-FOOTNOTESime1996138–139-70">[70]</a> Meitner, Hahn and Strassmann drew closer together personally as their anti-Nazi politics increasingly alienated them from the rest of the organisation, but it gave them more time for research, as administration was devolved to Hahn's and Meitner's assistants.<a href="#cite_note-FOOTNOTESime1996156–157,_169-69">[69]</a> <div class="mw-heading mw-heading3"><h3 id="Research">Research</h3>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=7" title="Edit section: Research">edit</a>]</div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Versuchsaufbau_Hahn_Deutsches_Museum-2.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Versuchsaufbau_Hahn_Deutsches_Museum-2.jpg/220px-Versuchsaufbau_Hahn_Deutsches_Museum-2.jpg" decoding="async" width="220" height="145" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Versuchsaufbau_Hahn_Deutsches_Museum-2.jpg/330px-Versuchsaufbau_Hahn_Deutsches_Museum-2.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Versuchsaufbau_Hahn_Deutsches_Museum-2.jpg/440px-Versuchsaufbau_Hahn_Deutsches_Museum-2.jpg 2x" data-file-width="1280" data-file-height="844" /></a><figcaption>The nuclear fission display at the <a href="/wiki/Deutsches_Museum" title="Deutsches Museum">Deutsches Museum</a> in <a href="/wiki/Munich" title="Munich">Munich</a>. The table and instruments are originals,<a href="#cite_note-72">[72]</a><a href="#cite_note-73">[73]</a> but would not have been together in the same room. Pressure from historians, scientists and feminists caused the museum to alter the display in 1988 to acknowledge Lise Meitner, <a href="/wiki/Otto_Frisch" class="mw-redirect" title="Otto Frisch">Otto Frisch</a> and Fritz Strassmann.<a href="#cite_note-An_Inconvenient_History-74">[74]</a></figcaption></figure> The Berlin group started by irradiating uranium salt with neutrons from a radon-beryllium source similar to the one that Fermi had used. They dissolved it and added <a href="/wiki/Potassium" title="Potassium">potassium</a> <a href="/wiki/Perrhenate" title="Perrhenate">perrhenate</a>, <a href="/wiki/Platinum(II)_chloride" title="Platinum(II) chloride">platinum chloride</a> and <a href="/wiki/Sodium_hydroxide" title="Sodium hydroxide">sodium hydroxide</a>. What remained was then acidified with <a href="/wiki/Hydrogen_sulphide" class="mw-redirect" title="Hydrogen sulphide">hydrogen sulphide</a>, resulting in platinum sulphide and rhenium sulphide precipitation. Fermi had noted four radioactive isotopes with the longest-lived having 13- and 90-minute half-lives, and these were detected in the precipitate. The Berlin group then tested for protactinium by adding protactinium-234 to the solution. When this was precipitated, it was found to be separated from the 13- and 90-minute half-life isotopes, demonstrating that von Grosse was incorrect, and they were not isotopes of protactinium. Moreover, the chemical reactions involved ruled out all elements from <a href="/wiki/Mercury_(element)" title="Mercury (element)">mercury</a> and above on the periodic table.<a href="#cite_note-FOOTNOTESime1996167-75">[75]</a> They were able to precipitate the 90-minute activity with osmium sulphide and the 13-minute one with rhenium sulphide, which ruled out them being isotopes of the same element. All this provided strong evidence that they were indeed transuranium elements, with chemical properties similar to osmium and rhenium.<a href="#cite_note-FOOTNOTESime1996169-76">[76]</a><a href="#cite_note-77">[77]</a> Fermi had also reported that fast and slow neutrons had produced different activities. This indicated that more than one reaction was taking place. When the Berlin group could not replicate the Rome group's findings, they commenced their own research into the effects of fast and slow neutrons. To minimise radioactive contamination if there were an accident, different phases were carried out in different rooms, all in Meitner's section on the ground floor of the Kaiser Wilhelm Institute. Neutron irradiation was carried out in one laboratory, chemical separation in another, and measurements were conducted in a third. The equipment they used was simple and mostly hand made.<a href="#cite_note-FOOTNOTESime1996170–172-78">[78]</a> By March 1936, they had identified ten different half-lives, with varying degrees of certainty. To account for them, Meitner had to hypothesise a new (n, 2n) class of reaction and the alpha decay of uranium, neither of which had ever been reported before, and for which physical evidence was lacking. So while Hahn and Strassmann refined their chemical procedures, Meitner devised new experiments to shine more light on the reaction processes. In May 1937, they issued parallel reports, one in Zeitschrift für Physik with Meitner as the principal author, and one in Chemische Berichte with Hahn as the principal author.<a href="#cite_note-FOOTNOTESime1996170–172-78">[78]</a><a href="#cite_note-Meitner_1937-79">[79]</a><a href="#cite_note-Hahn_1937-80">[80]</a> Hahn concluded his by stating emphatically: Vor allem steht ihre chemische Verschiedenheit von allen bisher bekannten Elementen außerhalb jeder Diskussion ("Above all, their chemical distinction from all previously known elements needs no further discussion."<a href="#cite_note-Hahn_1937-80">[80]</a>) Meitner was increasingly uncertain. They had now constructed three (n, γ) reactions: <ol><li>238 92U + n → 239 92U (10 seconds) → 239 93ekaRe (2.2 minutes) → 239 94ekaOs (59 minutes) → 239 95ekaIr (66 hours) → 239 96ekaPt (2.5 hours) → 239 97ekAu (?)</li> <li>238 92U + n → 239 92U (40 seconds) → 239 93ekaRe (16 minutes) → 239 94ekaOs (5.7 hours) → 239 95ekaIr (?)</li> <li>238 92U + n → 239 92U (23 minutes) → 239 93ekaRe</li></ol> Meitner was certain that these had to be (n, γ) reactions, as slow neutrons lacked the energy to chip off protons or alpha particles. She considered the possibility that the reactions were from different isotopes of uranium; three were known: uranium-238, uranium-235 and uranium-234. However, when she calculated the <a href="/wiki/Neutron_cross_section" title="Neutron cross section">neutron cross section</a> it was too large to be anything other than the most abundant isotope, uranium-238. She concluded that it must be a case of <a href="/wiki/Nuclear_isomer" title="Nuclear isomer">nuclear isomerism</a>, which had been discovered in protactinium by Hahn in 1922. Nuclear isomerism had been given a physical explanation by von Weizsäcker, who had been Meitner's assistant in 1936, but had since taken a position at the Kaiser Wilhelm Institute for Physics. Different nuclear isomers of protactinium had different half-lives, and this could be the case for uranium too, but if so it was somehow being inherited by the daughter and granddaughter products, which seemed to be stretching the argument to breaking point. Then there was the third reaction, an (n, γ) one, which occurred only with slow neutrons.<a href="#cite_note-FOOTNOTESime1996174–177-81">[81]</a> Meitner therefore ended her report on a very different note to Hahn, reporting that: "The process must be neutron capture by uranium-238, which leads to three isomeric nuclei of uranium-239. This result is very difficult to reconcile with current concepts of the nucleus."<a href="#cite_note-Meitner_1937-79">[79]</a><a href="#cite_note-FOOTNOTESime1996177-82">[82]</a> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:75th_Anniversary_Discovery_of_Nuclear_Fission_(01311665)_(11049703086).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/87/75th_Anniversary_Discovery_of_Nuclear_Fission_%2801311665%29_%2811049703086%29.jpg/220px-75th_Anniversary_Discovery_of_Nuclear_Fission_%2801311665%29_%2811049703086%29.jpg" decoding="async" width="220" height="146" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/87/75th_Anniversary_Discovery_of_Nuclear_Fission_%2801311665%29_%2811049703086%29.jpg/330px-75th_Anniversary_Discovery_of_Nuclear_Fission_%2801311665%29_%2811049703086%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/87/75th_Anniversary_Discovery_of_Nuclear_Fission_%2801311665%29_%2811049703086%29.jpg/440px-75th_Anniversary_Discovery_of_Nuclear_Fission_%2801311665%29_%2811049703086%29.jpg 2x" data-file-width="4540" data-file-height="3022" /></a><figcaption>Exhibition to mark the 75th anniversary of the discovery of nuclear fission, at the <a href="/wiki/Vienna_International_Centre" title="Vienna International Centre">Vienna International Centre</a> in 2013. Images of Meitner and Strassmann are prominently displayed.</figcaption></figure> After this, the Berlin group moved on to working with thorium, as Strassmann put it, "to recover from, the horror of the work with uranium".<a href="#cite_note-FOOTNOTESime1996179-83">[83]</a> However, thorium was not easier to work with than uranium. For a start, it had a decay product, <a href="/wiki/Radiothorium" class="mw-redirect" title="Radiothorium">radiothorium</a> (228 90Th) that overwhelmed weaker neutron-induced activity. But Hahn and Meitner had a sample from which they had regularly removed its mother isotope, <a href="/wiki/Mesothorium" class="mw-redirect" title="Mesothorium">mesothorium</a> (228 88Ra), over a period of several years, allowing the radiothorium to decay away. Even then, it was still more difficult to work with because its induced decay products from neutron irradiation were isotopes of the same elements produced by thorium's own radioactive decay. What they found was three different decay series, all alpha emitters—a form of decay not found in any other heavy element, and for which Meitner once again had to postulate multiple isomers. They did find an interesting result: these (n, α) decay series occurred simultaneously when the energy of the incident neutrons was less than 2.5 <a href="/wiki/MeV" class="mw-redirect" title="MeV">MeV</a>; when they had more, an (n, γ) reaction that formed 233 90Th was favoured.<a href="#cite_note-FOOTNOTESime1996180–181-84">[84]</a> In Paris, Irene Curie and <a href="/wiki/Pavel_Savitch" class="mw-redirect" title="Pavel Savitch">Pavel Savitch</a> had also set out to replicate Fermi's findings. In collaboration with <a href="/wiki/Hans_von_Halban" title="Hans von Halban">Hans von Halban</a> and Peter Preiswerk, they irradiated thorium and produced the isotope with a 22-minute half-life that Fermi had noted. In all, Curie's group detected eight different half-lives in their irradiated thorium. Curie and Savitch detected a radioactive substance with a 3.5-hour half-life.<a href="#cite_note-Discovery_of_Nuclear_Fission-44">[44]</a><a href="#cite_note-The_History_of_the_Discovery_of_Nuclear_Fission-38">[38]</a><a href="#cite_note-85">[85]</a> The Paris group proposed that it might be an isotope of thorium. Meitner asked Strassmann, who was now doing most of the chemistry work, to check. He detected no sign of thorium. Meitner wrote to Curie with their results, and suggested a quiet retraction.<a href="#cite_note-FOOTNOTESime1996182–183-86">[86]</a> Nonetheless, Curie persisted. They investigated the chemistry, and found that the 3.5-hour activity was coming from something that seemed to be chemically similar to <a href="/wiki/Lanthanum" title="Lanthanum">lanthanum</a> (which in fact it was), which they attempted unsuccessfully to isolate with a <a href="/wiki/Fractional_crystallization_(chemistry)" title="Fractional crystallization (chemistry)">fractional crystallization</a> process. (It is possible that their precipitate was contaminated with <a href="/wiki/Yttrium" title="Yttrium">yttrium</a>, which is chemically similar.) By using Geiger counters and skipping the chemical precipitation, Curie and Savitch detected the 3.5-hour half-life in irradiated uranium.<a href="#cite_note-Sur_les_radioéléments-87">[87]</a> With the <a href="/wiki/Anschluss" title="Anschluss">Anschluss</a>, Germany's unification with Austria on 12 March 1938, Meitner lost her Austrian citizenship.<a href="#cite_note-FOOTNOTESime1996184–185-88">[88]</a> <a href="/wiki/James_Franck" title="James Franck">James Franck</a> offered to sponsor her immigration to the United States, and Bohr offered a temporary place at his institute, but when she went to the Danish embassy for a visa, she was told that Denmark no longer recognised her Austrian passport as valid.<a href="#cite_note-FOOTNOTESime1996189–190-89">[89]</a> On 13 July 1938, Meitner departed for the Netherlands with Dutch physicist <a href="/wiki/Dirk_Coster" title="Dirk Coster">Dirk Coster</a>. Before she left, Otto Hahn gave her a diamond ring he had inherited from his mother to sell if necessary. She reached safety, but with only her summer clothes. Meitner later said that she left Germany forever with 10 marks in her purse. With the help of Coster and <a href="/wiki/Adriaan_Fokker" title="Adriaan Fokker">Adriaan Fokker</a>, she flew to Copenhagen, where she was greeted by Frisch, and stayed with Niels and <a href="/wiki/Margrethe_Bohr" title="Margrethe Bohr">Margrethe Bohr</a> at their holiday house in <a href="/wiki/Tisvilde" title="Tisvilde">Tisvilde</a>. On 1 August she took the train to <a href="/wiki/Stockholm" title="Stockholm">Stockholm</a>, where she was met by <a href="/wiki/Eva_von_Bahr_(physicist)" title="Eva von Bahr (physicist)">Eva von Bahr</a>.<a href="#cite_note-FOOTNOTESime1996200–207-90">[90]</a> <div class="mw-heading mw-heading3"><h3 id="Interpretation">Interpretation</h3>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=8" title="Edit section: Interpretation">edit</a>]</div> The Paris group published their results in September 1938.<a href="#cite_note-Sur_les_radioéléments-87">[87]</a> Hahn dismissed the isotope with the 3.5-hour half-life as contamination, but after looking at the details of the Paris group's experiments and the decay curves, Strassmann was worried. He decided to repeat the experiment, using his more efficient method of separating radium. This time, they found what they thought was radium, which Hahn suggested resulted from two alpha decays: <dl><dd>238 92U + n → α + 235 90Th → α + 235 88Ra</dd></dl> Meitner found this very hard to believe.<a href="#cite_note-FOOTNOTESime1996221–224-91">[91]</a><a href="#cite_note-92">[92]</a> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Kernspaltung.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3a/Kernspaltung.gif/220px-Kernspaltung.gif" decoding="async" width="220" height="154" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3a/Kernspaltung.gif/330px-Kernspaltung.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3a/Kernspaltung.gif/440px-Kernspaltung.gif 2x" data-file-width="848" data-file-height="592" /></a><figcaption>The mechanism of fission. A neutron caused the nucleus to wobble, elongate, and split.</figcaption></figure> In November, Hahn travelled to Copenhagen, where he met with Bohr and Meitner. They told him that they were very unhappy about the proposed radium isomers. On Meitner's instructions, Hahn and Strassmann began to redo the experiments, even as Fermi was collecting his Nobel Prize in Stockholm.<a href="#cite_note-FOOTNOTESime1996227–230-93">[93]</a> Assisted by <a href="/wiki/Clara_Lieber" title="Clara Lieber">Clara Lieber</a> and Irmgard Bohne, Hahn and Strassmann isolated the three radium isotopes (verified by their half-lives) and used fractional crystallisation to separate them from the barium carrier by adding <a href="/wiki/Barium_bromide" title="Barium bromide">barium bromide</a> crystals in four steps. Since radium precipitates preferentially in a solution of barium bromide, at each step the fraction drawn off would contain less radium than the one before. However, they found no difference between each of the fractions. In case their process was faulty in some way, they verified it with known isotopes of radium; the process was fine. Hahn and Strassmann found a fourth radium isotope. Their half-lives were formulated as such by Hahn and Strassmann: <dl><dd><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {Ra\ I?} _{}^{}\ {\xrightarrow[{\mathrm {<} \ {\text{1 min.}}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Ac\ I\ } {\xrightarrow[{\mathrm {<} \ {\text{30 min.}}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Th?} }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msubsup> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">R</mi> <mi mathvariant="normal">a</mi> <mtext> </mtext> <mi mathvariant="normal">I</mi> <mo>?</mo> </mrow> <mrow class="MJX-TeXAtom-ORD"> </mrow> <mrow class="MJX-TeXAtom-ORD"> </mrow> </msubsup> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <munderover> <mo>→</mo> <mpadded width="+0.611em" lspace="0.278em" voffset="-.24em"> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mo><</mo> </mrow> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mtext>1 min.</mtext> </mrow> </mrow> </mpadded> <mpadded width="+0.611em" lspace="0.278em" voffset=".15em"> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>β</mi> </mrow> </mpadded> </munderover> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> <mi mathvariant="normal">A</mi> <mi mathvariant="normal">c</mi> <mtext> </mtext> <mi mathvariant="normal">I</mi> <mtext> </mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <munderover> <mo>→</mo> <mpadded width="+0.611em" lspace="0.278em" voffset="-.24em"> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mo><</mo> </mrow> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mtext>30 min.</mtext> </mrow> </mrow> </mpadded> <mpadded width="+0.611em" lspace="0.278em" voffset=".15em"> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>β</mi> </mrow> </mpadded> </munderover> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> <mi mathvariant="normal">T</mi> <mi mathvariant="normal">h</mi> <mo>?</mo> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {Ra\ I?} _{}^{}\ {\xrightarrow[{\mathrm {<} \ {\text{1 min.}}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Ac\ I\ } {\xrightarrow[{\mathrm {<} \ {\text{30 min.}}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Th?} }</annotation> </semantics> </math><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/f74eefea18aa469cc4623f5237e6fae3ec0f4011" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.815ex; margin-top: -0.345ex; margin-bottom: -0.523ex; width:32.365ex; height:5.843ex;" alt="{\displaystyle \mathrm {Ra\ I?} _{}^{}\ {\xrightarrow[{\mathrm {<} \ {\text{1 min.}}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Ac\ I\ } {\xrightarrow[{\mathrm {<} \ {\text{30 min.}}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Th?} }"></dd> <dd><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {Ra\ II} _{}^{}\ {\xrightarrow[{{\text{14}}\ \mathrm {\pm } \ {2min.}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Ac\ II\ } {\xrightarrow[{\mathrm {\sim } \ {\text{2,5 h.}}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Th?} }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msubsup> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">R</mi> <mi mathvariant="normal">a</mi> <mtext> </mtext> <mi mathvariant="normal">I</mi> <mi mathvariant="normal">I</mi> </mrow> <mrow class="MJX-TeXAtom-ORD"> </mrow> <mrow class="MJX-TeXAtom-ORD"> </mrow> </msubsup> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <munderover> <mo>→</mo> <mpadded width="+0.611em" lspace="0.278em" voffset="-.24em"> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mtext>14</mtext> </mrow> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mo>±</mo> </mrow> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> <mi>m</mi> <mi>i</mi> <mi>n</mi> <mo>.</mo> </mrow> </mrow> </mpadded> <mpadded width="+0.611em" lspace="0.278em" voffset=".15em"> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>β</mi> </mrow> </mpadded> </munderover> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> <mi mathvariant="normal">A</mi> <mi mathvariant="normal">c</mi> <mtext> </mtext> <mi mathvariant="normal">I</mi> <mi mathvariant="normal">I</mi> <mtext> </mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <munderover> <mo>→</mo> <mpadded width="+0.611em" lspace="0.278em" voffset="-.24em"> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mo>∼</mo> </mrow> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mtext>2,5 h.</mtext> </mrow> </mrow> </mpadded> <mpadded width="+0.611em" lspace="0.278em" voffset=".15em"> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>β</mi> </mrow> </mpadded> </munderover> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> <mi mathvariant="normal">T</mi> <mi mathvariant="normal">h</mi> <mo>?</mo> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {Ra\ II} _{}^{}\ {\xrightarrow[{{\text{14}}\ \mathrm {\pm } \ {2min.}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Ac\ II\ } {\xrightarrow[{\mathrm {\sim } \ {\text{2,5 h.}}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Th?} }</annotation> </semantics> </math><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ece61164bc691dff725841bd5f2cceb4c5063de2" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.112ex; margin-top: -0.345ex; margin-bottom: -0.559ex; width:33.478ex; height:6.176ex;" alt="{\displaystyle \mathrm {Ra\ II} _{}^{}\ {\xrightarrow[{{\text{14}}\ \mathrm {\pm } \ {2min.}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Ac\ II\ } {\xrightarrow[{\mathrm {\sim } \ {\text{2,5 h.}}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Th?} }"></dd> <dd><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {Ra\ III} _{}^{}\ {\xrightarrow[{{\text{86}}\ \mathrm {\pm } \ {6min.}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Ac\ III\ } {\xrightarrow[{\mathrm {\sim } \ {\text{couple of days?}}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Th?} }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msubsup> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">R</mi> <mi mathvariant="normal">a</mi> <mtext> </mtext> <mi mathvariant="normal">I</mi> <mi mathvariant="normal">I</mi> <mi mathvariant="normal">I</mi> </mrow> <mrow class="MJX-TeXAtom-ORD"> </mrow> <mrow class="MJX-TeXAtom-ORD"> </mrow> </msubsup> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <munderover> <mo>→</mo> <mpadded width="+0.611em" lspace="0.278em" voffset="-.24em"> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mtext>86</mtext> </mrow> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mo>±</mo> </mrow> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>6</mn> <mi>m</mi> <mi>i</mi> <mi>n</mi> <mo>.</mo> </mrow> </mrow> </mpadded> <mpadded width="+0.611em" lspace="0.278em" voffset=".15em"> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>β</mi> </mrow> </mpadded> </munderover> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> <mi mathvariant="normal">A</mi> <mi mathvariant="normal">c</mi> <mtext> </mtext> <mi mathvariant="normal">I</mi> <mi mathvariant="normal">I</mi> <mi mathvariant="normal">I</mi> <mtext> </mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <munderover> <mo>→</mo> <mpadded width="+0.611em" lspace="0.278em" voffset="-.24em"> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mo>∼</mo> </mrow> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mtext>couple of days?</mtext> </mrow> </mrow> </mpadded> <mpadded width="+0.611em" lspace="0.278em" voffset=".15em"> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>β</mi> </mrow> </mpadded> </munderover> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> <mi mathvariant="normal">T</mi> <mi mathvariant="normal">h</mi> <mo>?</mo> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {Ra\ III} _{}^{}\ {\xrightarrow[{{\text{86}}\ \mathrm {\pm } \ {6min.}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Ac\ III\ } {\xrightarrow[{\mathrm {\sim } \ {\text{couple of days?}}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Th?} }</annotation> </semantics> </math><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/b523adaf0259a66e8aa90e2b1707d3eb478a6a50" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.143ex; margin-top: -0.345ex; margin-bottom: -0.528ex; width:42.186ex; height:6.176ex;" alt="{\displaystyle \mathrm {Ra\ III} _{}^{}\ {\xrightarrow[{{\text{86}}\ \mathrm {\pm } \ {6min.}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Ac\ III\ } {\xrightarrow[{\mathrm {\sim } \ {\text{couple of days?}}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Th?} }"></dd> <dd><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {Ra\ IV} _{}^{}\ {\xrightarrow[{\text{250-300 hrs.}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Ac\ IV\ } {\xrightarrow[{\text{40 hrs.}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Th?} }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msubsup> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">R</mi> <mi mathvariant="normal">a</mi> <mtext> </mtext> <mi mathvariant="normal">I</mi> <mi mathvariant="normal">V</mi> </mrow> <mrow class="MJX-TeXAtom-ORD"> </mrow> <mrow class="MJX-TeXAtom-ORD"> </mrow> </msubsup> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <munderover> <mo>→</mo> <mpadded width="+0.611em" lspace="0.278em" voffset="-.24em"> <mrow class="MJX-TeXAtom-ORD"> <mtext>250-300 hrs.</mtext> </mrow> </mpadded> <mpadded width="+0.611em" lspace="0.278em" voffset=".15em"> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>β</mi> </mrow> </mpadded> </munderover> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> <mi mathvariant="normal">A</mi> <mi mathvariant="normal">c</mi> <mtext> </mtext> <mi mathvariant="normal">I</mi> <mi mathvariant="normal">V</mi> <mtext> </mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <munderover> <mo>→</mo> <mpadded width="+0.611em" lspace="0.278em" voffset="-.24em"> <mrow class="MJX-TeXAtom-ORD"> <mtext>40 hrs.</mtext> </mrow> </mpadded> <mpadded width="+0.611em" lspace="0.278em" voffset=".15em"> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>β</mi> </mrow> </mpadded> </munderover> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mtext> </mtext> <mi mathvariant="normal">T</mi> <mi mathvariant="normal">h</mi> <mo>?</mo> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {Ra\ IV} _{}^{}\ {\xrightarrow[{\text{250-300 hrs.}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Ac\ IV\ } {\xrightarrow[{\text{40 hrs.}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Th?} }</annotation> </semantics> </math><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/10353511a4f6957912f2eee1997b4a93d2d118a0" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.828ex; margin-top: -0.345ex; margin-bottom: -0.51ex; width:34.626ex; height:5.843ex;" alt="{\displaystyle \mathrm {Ra\ IV} _{}^{}\ {\xrightarrow[{\text{250-300 hrs.}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Ac\ IV\ } {\xrightarrow[{\text{40 hrs.}}]{{\text{ }}\mathrm {\beta } }}\mathrm {\ Th?} }"></dd></dl> On 19 December, Hahn wrote to Meitner, informing her that the radium isotopes behaved chemically like barium. Anxious to finish up before the Christmas break, Hahn and Strassmann submitted their findings to Naturwissenschaften on 22 December without waiting for Meitner to reply.<a href="#cite_note-FOOTNOTESime1996233–234-94">[94]</a> Hahn understood that a "burst" of the atomic nuclei had occurred,<a href="#cite_note-95">[95]</a><a href="#cite_note-Nobel_was_well_deserved-96">[96]</a> but he was unsure about that interpretation. Hahn concluded the article in "Naturwissenschaften" with: "As chemists... we should substitute the symbols Ba, La, Ce for Ra, Ac, Th. As 'nuclear chemists' fairly close to physics we cannot yet bring ourselves to take this step which contradicts all previous experience in physics."<a href="#cite_note-97">[97]</a> Frisch normally celebrated Christmas with Meitner in Berlin, but in 1938 she accepted an invitation from Eva von Bahr to spend it with her family at <a href="/wiki/Kung%C3%A4lv" title="Kungälv">Kungälv</a>, and Meitner asked Frisch to join her there. Meitner received the letter from Hahn describing his chemical proof that some of the product of the bombardment of uranium with neutrons was barium. Barium had an atomic mass 40% less than uranium, and no previously known methods of radioactive decay could account for such a large difference in the mass of the nucleus.<a href="#cite_note-FOOTNOTEFrisch1979113–114-98">[98]</a><a href="#cite_note-FOOTNOTESime1996235–239-99">[99]</a> Nonetheless, she had immediately written back to Hahn to say: "At the moment the assumption of such a thoroughgoing breakup seems very difficult to me, but in nuclear physics we have experienced so many surprises, that one cannot unconditionally say: 'It is impossible.'"<a href="#cite_note-FOOTNOTESime1996235-100">[100]</a> Meitner felt that Hahn was too careful a chemist to make an elementary blunder, but found the results difficult to explain. All the nuclear reactions that had been documented involved chipping protons or alpha particles from the nucleus. Breaking it up seemed far more difficult. However the liquid drop model that Gamow had postulated suggested the possibility that an atomic nucleus could become elongated and overcome the surface tension that held it together.<a href="#cite_note-FOOTNOTEFrisch1979115–116-101">[101]</a> According to Frisch:<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1244412712"><blockquote class="templatequote">At that point we both sat down on a tree trunk (all that discussion had taken place while we walked through the wood in the snow, I with my skis on, Lise Meitner making good her claim that she could walk just as fast without), and started to calculate on scraps of paper. The charge of a uranium nucleus, we found, was indeed large enough to overcome the effect of the surface tension almost completely; so the uranium nucleus might indeed resemble a very wobbly unstable drop, ready to divide itself at the slightest provocation, such as the impact of a single neutron.<div class="paragraphbreak" style="margin-top:0.5em"></div>But there was another problem. After separation, the two drops would be driven apart by their mutual electric repulsion and would acquire high speed and hence a very large energy, about 200 MeV in all; where could that energy come from? Fortunately Lise Meitner remembered the empirical formula for computing the masses of nuclei and worked out that the two nuclei formed by the division of a uranium nucleus together would be lighter than the original uranium nucleus by about one-fifth the mass of a proton. Now whenever mass disappears energy is created, according to <a href="/wiki/Albert_Einstein" title="Albert Einstein">Einstein</a>'s formula <a href="/wiki/Mass%E2%80%93energy_equivalence" title="Mass–energy equivalence"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle E=m\,c^{2}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>E</mi> <mo>=</mo> <mi>m</mi> <mspace width="thinmathspace" /> <msup> <mi>c</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle E=m\,c^{2}}</annotation> </semantics> </math><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/cc54e0e584cb5aa5d15e95537d2ea2f64a905a34" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:9.363ex; height:2.676ex;" alt="{\displaystyle E=m\,c^{2}}"></a>, and one-fifth of a proton mass was just equivalent to 200 MeV. So here was the source for that energy; it all fitted!<a href="#cite_note-FOOTNOTEFrisch1979115–116-101">[101]</a></blockquote> Meitner and Frisch had correctly interpreted Hahn's results to mean that the nucleus of uranium had split roughly in half. The first two reactions that the Berlin group had observed were light elements created by the breakup of uranium nuclei; the third, the 23-minute one, was a decay into the real element 93.<a href="#cite_note-FOOTNOTESime1996243-102">[102]</a> On returning to Copenhagen, Frisch informed Bohr, who slapped his forehead and exclaimed "What idiots we have been!"<a href="#cite_note-FOOTNOTEFrisch1979116-103">[103]</a> Bohr promised not to say anything until they had a paper ready for publication. To speed the process, they decided to submit a one-page note to Nature. At this point, the only evidence that they had was the barium. Logically, if barium was formed, the other element must be <a href="/wiki/Krypton" title="Krypton">krypton</a>,<a href="#cite_note-FOOTNOTESime1996246-104">[104]</a> although Hahn mistakenly believed that the <a href="/wiki/Atomic_mass" title="Atomic mass">atomic masses</a> had to add up to 239 rather than the <a href="/wiki/Atomic_number" title="Atomic number">atomic numbers</a> adding up to 92, and thought it was masurium (technetium), and so did not check for it:<a href="#cite_note-FOOTNOTESime1996239,_456-105">[105]</a> <dl><dd>235 92U + n → 56Ba + 36Kr + some n</dd></dl> Over a series of long-distance phone calls, Meitner and Frisch came up with a simple experiment to bolster their claim: to measure the recoil of the fission fragments, using a Geiger counter with the threshold set above that of the alpha particles. Frisch conducted the experiment on 13 January 1939, and found the pulses caused by the reaction just as they had predicted.<a href="#cite_note-FOOTNOTESime1996246-104">[104]</a> He decided he needed a name for the newly discovered nuclear process. He spoke to William A. Arnold, an American biologist working with de Hevesy and asked him what biologists called the process by which living cells divided into two cells. Arnold told him that biologists called it <a href="/wiki/Fission_(biology)" title="Fission (biology)">fission</a>. Frisch then applied that name to the nuclear process in his paper.<a href="#cite_note-FOOTNOTERhodes1986263-106">[106]</a> Frisch mailed both the jointly-authored note on fission and his paper on the recoil experiment to Nature on 16 January 1939; the former appeared in print on 11 February and the latter on 18 February.<a href="#cite_note-Meitner1939-107">[107]</a><a href="#cite_note-108">[108]</a> In their second publication on nuclear fission in February 1939, Hahn and Strassmann used the term Uranspaltung (uranium fission) for the first time, and predicted the existence and liberation of additional neutrons during the fission process, opening up the possibility of a <a href="/wiki/Nuclear_chain_reaction" title="Nuclear chain reaction">nuclear chain reaction</a>.<a href="#cite_note-109">[109]</a> In an 8 March 1959 interview, Meitner said: "It [the discovery of nuclear fission] was achieved with an unusually good chemistry by Hahn and Strassmann, with a fantastically good chemistry that nobody else could do at that time. Later, the Americans learned it. But at that time Hahn and Strassmann were really the only ones who could do it at all because they were such good chemists. They really demonstrated a physical process with chemistry, so to speak."<a href="#cite_note-110">[110]</a> <div class="mw-heading mw-heading2"><h2 id="Reception">Reception</h2>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=9" title="Edit section: Reception">edit</a>]</div> <div class="mw-heading mw-heading3"><h3 id="Bohr_brings_the_news_to_the_United_States">Bohr brings the news to the United States</h3>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=10" title="Edit section: Bohr brings the news to the United States">edit</a>]</div> Before departing for the United States on 7 January 1939 with his son Erik to attend the Fifth Washington Conference on Theoretical Physics, Bohr promised Frisch that he would not mention fission until the papers appeared in print, but during the Atlantic crossing on the <a href="/wiki/SS_Drottningholm" title="SS Drottningholm">SS Drottningholm</a>, Bohr discussed the mechanism of fission with <a href="/wiki/Leon_Rosenfeld" class="mw-redirect" title="Leon Rosenfeld">Leon Rosenfeld</a>, and failed to inform him that the information was confidential. On arrival in <a href="/wiki/New_York_City" title="New York City">New York City</a> on 16 January, they were met by Fermi and his wife <a href="/wiki/Laura_Capon" class="mw-redirect" title="Laura Capon">Laura Capon</a>, and by <a href="/wiki/John_Archibald_Wheeler" title="John Archibald Wheeler">John Wheeler</a>, who had been a fellow at Bohr's institute in 1934–1935. As it happened, there was a meeting of <a href="/wiki/Princeton_University" title="Princeton University">Princeton University</a>'s Physics Journal Club that evening, and when Wheeler asked Rosenfeld if he had any news to report, Rosenfeld told them.<a href="#cite_note-Bringing_the_News_of_Fission_to_America-111">[111]</a> An embarrassed Bohr fired off a note to Nature defending Meitner and Frisch's claim to the priority of the discovery.<a href="#cite_note-FOOTNOTESime1996260–261-112">[112]</a> Hahn was annoyed that while Bohr mentioned his and Strassmann's work in the note, he cited only Meitner and Frisch.<a href="#cite_note-FOOTNOTESime1996263-113">[113]</a> News spread quickly of the new discovery, which was correctly seen as an entirely novel physical effect with great scientific—and potentially practical—possibilities. <a href="/wiki/Isidor_Isaac_Rabi" title="Isidor Isaac Rabi">Isidor Isaac Rabi</a> and <a href="/wiki/Willis_Lamb" title="Willis Lamb">Willis Lamb</a>, two <a href="/wiki/Columbia_University" title="Columbia University">Columbia University</a> physicists working at Princeton, heard the news and carried it back to Columbia. Rabi said he told Fermi; Fermi gave credit to Lamb. For Fermi, the news came as a profound embarrassment, as the <a href="/wiki/Transuranic_elements" class="mw-redirect" title="Transuranic elements">transuranic elements</a> that he had partly been awarded the Nobel Prize for discovering had not been transuranic elements at all, but <a href="/wiki/Fission_products" class="mw-redirect" title="Fission products">fission products</a>. He added a footnote to this effect to his Nobel Prize acceptance speech. Bohr soon thereafter went from Princeton to Columbia to see Fermi. Not finding Fermi in his office, Bohr went down to the cyclotron area and found <a href="/wiki/Herbert_L._Anderson" title="Herbert L. Anderson">Herbert L. Anderson</a>. Bohr grabbed him by the shoulder and said: "Young man, let me explain to you about something new and exciting in physics."<a href="#cite_note-FOOTNOTERhodes1986267–268-114">[114]</a> <div class="mw-heading mw-heading3"><h3 id="Further_research">Further research</h3>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=11" title="Edit section: Further research">edit</a>]</div> It was clear to many scientists at Columbia that they should try to detect the energy released in the nuclear fission of uranium from neutron bombardment. On 25 January 1939, a Columbia University group conducted the first nuclear fission experiment in the United States,<a href="#cite_note-115">[115]</a> which was done in the basement of <a href="/wiki/Pupin_Hall" title="Pupin Hall">Pupin Hall</a>. The experiment involved placing uranium oxide inside of an <a href="/wiki/Ionization_chamber" title="Ionization chamber">ionization chamber</a> and irradiating it with neutrons, and measuring the energy thus released. The next day, the Fifth Washington Conference on Theoretical Physics began in <a href="/wiki/Washington,_D.C." title="Washington, D.C.">Washington, D.C.</a>, under the joint auspices of <a href="/wiki/The_George_Washington_University" class="mw-redirect" title="The George Washington University">The George Washington University</a> and the <a href="/wiki/Carnegie_Institution_of_Washington" class="mw-redirect" title="Carnegie Institution of Washington">Carnegie Institution of Washington</a>. From there, the news on nuclear fission spread even further, which fostered many more experimental demonstrations.<a href="#cite_note-FOOTNOTERhodes1986267–270-116">[116]</a> Bohr and Wheeler overhauled the liquid drop model to explain the mechanism of nuclear fission, with conspicuous success.<a href="#cite_note-117">[117]</a> Their paper appeared in <a href="/wiki/Physical_Review" title="Physical Review">Physical Review</a> on 1 September 1939, the day <a href="/wiki/Invasion_of_Poland" title="Invasion of Poland">Germany invaded Poland</a>, starting <a href="/wiki/World_War_II" title="World War II">World War II</a> in Europe.<a href="#cite_note-FOOTNOTEWheelerFord199831-118">[118]</a> As the experimental physicists studied fission, they uncovered more puzzling results. <a href="/wiki/George_Placzek" title="George Placzek">George Placzek</a> asked Bohr why uranium fissioned with both very fast and very slow neutrons. Walking to a meeting with Wheeler, Bohr had an insight that the fission at low energies was due to the uranium-235 isotope, while at high energies it was mainly due to the far more abundant <a href="/wiki/Uranium-238" title="Uranium-238">uranium-238</a> isotope.<a href="#cite_note-FOOTNOTEWheelerFord199827–28-119">[119]</a> This was based on Meitner's 1937 measurements of the neutron capture cross-sections.<a href="#cite_note-FOOTNOTESime1996258-120">[120]</a> This would be experimentally verified in February 1940, after <a href="/wiki/Alfred_Nier" class="mw-redirect" title="Alfred Nier">Alfred Nier</a> was able to produce sufficient pure uranium-235 for <a href="/wiki/John_R._Dunning" title="John R. Dunning">John R. Dunning</a>, Aristid von Grosse and <a href="/wiki/Eugene_T._Booth" title="Eugene T. Booth">Eugene T. Booth</a> to test.<a href="#cite_note-FOOTNOTESime1996260–261-112">[112]</a> Other scientists resumed the search for the elusive element 93, which seemed to be straightforward, as they now knew it resulted from the 23-minute half-life. At the <a href="/wiki/Lawrence_Berkeley_National_Laboratory" title="Lawrence Berkeley National Laboratory">Radiation Laboratory</a> in <a href="/wiki/Berkeley,_California" title="Berkeley, California">Berkeley, California</a>, Emilio Segrè and <a href="/wiki/Edwin_McMillan" title="Edwin McMillan">Edwin McMillan</a> used the <a href="/wiki/Cyclotron" title="Cyclotron">cyclotron</a> to create the isotope. They then detected a beta activity with a 2-day half-life, but it had <a href="/wiki/Rare-earth_element" title="Rare-earth element">rare-earth element</a> chemical characteristics, and element 93 was supposed to have chemistry akin to rhenium. It was therefore overlooked as just another fission product. Another year passed before McMillan and <a href="/wiki/Philip_Abelson" title="Philip Abelson">Philip Abelson</a> determined that the 2-day half-life element was that of the elusive element 93, which they named "<a href="/wiki/Neptunium" title="Neptunium">neptunium</a>". They paved the way for the discovery by <a href="/wiki/Glenn_Seaborg" class="mw-redirect" title="Glenn Seaborg">Glenn Seaborg</a>, Emilio Segrè and <a href="/wiki/Joseph_W._Kennedy" title="Joseph W. Kennedy">Joseph W. Kennedy</a> of element 94, which they named "<a href="/wiki/Plutonium" title="Plutonium">plutonium</a>" in 1941.<a href="#cite_note-121">[121]</a><a href="#cite_note-FOOTNOTERhodes1986353–355-122">[122]</a> Another avenue of research, spearheaded by Meitner, was to determine if other elements could fission after being irradiated with neutrons. It was soon determined that thorium and protactinium could. Measurements were also made of the amount of energy released.<a href="#cite_note-FOOTNOTEYruma200839–42-20">[20]</a> Hans von Halban, <a href="/wiki/Fr%C3%A9d%C3%A9ric_Joliot-Curie" title="Frédéric Joliot-Curie">Frédéric Joliot-Curie</a> and <a href="/wiki/Lew_Kowarski" title="Lew Kowarski">Lew Kowarski</a> demonstrated that uranium bombarded by neutrons emitted more neutrons than it absorbed, suggesting the possibility of a nuclear chain reaction.<a href="#cite_note-123">[123]</a> Fermi and Anderson did so too a few weeks later.<a href="#cite_note-124">[124]</a><a href="#cite_note-125">[125]</a> It was apparent to many scientists that, in theory at least, an extremely powerful energy source could be created, although most still considered an <a href="/wiki/Atomic_bomb" class="mw-redirect" title="Atomic bomb">atomic bomb</a> an impossibility.<a href="#cite_note-FOOTNOTEClark196125–29-126">[126]</a> <div class="mw-heading mw-heading3"><h3 id="Nobel_Prize">Nobel Prize</h3>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=12" title="Edit section: Nobel Prize">edit</a>]</div> Both Hahn and Meitner had been nominated for the chemistry and the physics Nobel Prizes many times even before the discovery of nuclear fission for their work on radioactive isotopes and protactinium. Several more nominations followed for the discovery of fission between 1940 and 1943.<a href="#cite_note-Hahn_nominations-26">[26]</a><a href="#cite_note-Meitner_nominations-27">[27]</a> Nobel Prize nominations were vetted by committees of five, one for each award. Although both Hahn and Meitner received nominations for physics, radioactivity and radioactive elements had traditionally been seen as the domain of chemistry, and so the <a href="/wiki/Nobel_Committee_for_Chemistry" title="Nobel Committee for Chemistry">Nobel Committee for Chemistry</a> evaluated the nominations in 1944.<a href="#cite_note-A_Nobel_Tale_of_Postwar_Injustice-127">[127]</a> The committee received reports from <a href="/wiki/Theodor_Svedberg" title="Theodor Svedberg">Theodor Svedberg</a> in 1941 and <a href="/w/index.php?title=Arne_Westgren&action=edit&redlink=1" class="new" title="Arne Westgren (page does not exist)">Arne Westgren</a> [<a href="https://sv.wikipedia.org/wiki/Arne_Westgren" class="extiw" title="sv:Arne Westgren">sv</a>] in 1942. These chemists were impressed by Hahn's work, but felt that the experimental work of Meitner and Frisch was not extraordinary. They did not understand why the physics community regarded their work as seminal. As for Strassmann, although his name was on the papers, there was a long-standing policy of conferring awards on the most senior scientist in a collaboration. In 1944 the Nobel Committee for Chemistry voted to recommend that Hahn alone be given the Nobel Prize in Chemistry for 1944.<a href="#cite_note-A_Nobel_Tale_of_Postwar_Injustice-127">[127]</a> However, Germans had been forbidden to accept Nobel Prizes after the <a href="/wiki/Nobel_Peace_Prize" title="Nobel Peace Prize">Nobel Peace Prize</a> had been awarded to <a href="/wiki/Carl_von_Ossietzky" title="Carl von Ossietzky">Carl von Ossietzky</a> in 1936.<a href="#cite_note-FOOTNOTESime1996158,_232-128">[128]</a> The committee's recommendation was rejected by the <a href="/wiki/Royal_Swedish_Academy_of_Sciences" title="Royal Swedish Academy of Sciences">Royal Swedish Academy of Sciences</a>, which decided to defer the award for one year.<a href="#cite_note-A_Nobel_Tale_of_Postwar_Injustice-127">[127]</a> The war was over when the academy reconsidered the award in September 1945. The Nobel Committee for Chemistry had now become more cautious, as it was apparent that much research had been undertaken by the <a href="/wiki/Manhattan_Project" title="Manhattan Project">Manhattan Project</a> in the United States in secret, and it suggested deferring the 1944 Nobel Prize in Chemistry for another year. The academy was swayed by <a href="/wiki/G%C3%B6ran_Liljestrand" title="Göran Liljestrand">Göran Liljestrand</a>, who argued that it was important for the academy to assert its independence from the <a href="/wiki/Allies_of_World_War_II" title="Allies of World War II">Allies of World War II</a>, and award the Nobel Prize in Chemistry to a German,<a href="#cite_note-FOOTNOTEYruma2008138-129">[129]</a> as it had done after World War I when it had awarded it to <a href="/wiki/Fritz_Haber" title="Fritz Haber">Fritz Haber</a>. Hahn therefore became the sole recipient of the 1944 Nobel Prize in Chemistry "for his discovery of the fission of heavy nuclei".<a href="#cite_note-130">[130]</a> Meitner wrote in a letter to her friend Birgit Broomé-Aminoff on 20 November 1945:<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1244412712"><blockquote class="templatequote">Surely Hahn fully deserved the Nobel Prize in chemistry. There is really no doubt about it. But I believe that Otto Robert Frisch and I contributed something not insignificant to the clarification of the process of uranium fission – how it originates and that it produces so much energy, and that was something very remote from Hahn. For this reason I found it a bit unjust that in the newspapers I was called a Mitarbeiterin [subordinate] of Hahn's in the same sense that Strassmann was.<a href="#cite_note-FOOTNOTESime1996326–327-131">[131]</a></blockquote> In 1946, the <a href="/wiki/Nobel_Committee_for_Physics" title="Nobel Committee for Physics">Nobel Committee for Physics</a> considered nominations for Meitner and Frisch received from <a href="/wiki/Max_von_Laue" title="Max von Laue">Max von Laue</a>, Niels Bohr, <a href="/wiki/Oskar_Klein" title="Oskar Klein">Oskar Klein</a>, <a href="/wiki/Egil_Hylleraas" title="Egil Hylleraas">Egil Hylleraas</a> and James Franck. Reports were written for the committee by Erik Hulthén, who held the chair of experimental physics at <a href="/wiki/Stockholm_University" title="Stockholm University">Stockholm University</a>, in 1945 and 1946. Hulthén argued that theoretical physics should be considered award-worthy only if it inspired great experiments. The role of Meitner and Frisch in being the first to understand and explain fission was not understood. There may also have been personal factors: the chairman of the committee, <a href="/wiki/Manne_Siegbahn" title="Manne Siegbahn">Manne Siegbahn</a>, disliked Meitner, and had a professional rivalry with Klein.<a href="#cite_note-A_Nobel_Tale_of_Postwar_Injustice-127">[127]</a><a href="#cite_note-FOOTNOTEYruma200873-132">[132]</a> Meitner and Frisch would continue to be nominated regularly for many years, but would never be awarded a Nobel Prize.<a href="#cite_note-Meitner_nominations-27">[27]</a><a href="#cite_note-A_Nobel_Tale_of_Postwar_Injustice-127">[127]</a><a href="#cite_note-Frisch_nominations-133">[133]</a> <div class="mw-heading mw-heading2"><h2 id="In_history_and_memory">In history and memory</h2>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=13" title="Edit section: In history and memory">edit</a>]</div> At the end of the war in Europe, Hahn was taken into custody and incarcerated at <a href="/wiki/Farm_Hall" class="mw-redirect" title="Farm Hall">Farm Hall</a> with nine other senior scientists, all of whom except Max von Laue had been involved with the <a href="/wiki/German_nuclear_weapons_program" class="mw-redirect" title="German nuclear weapons program">German nuclear weapons program</a>, and all except Hahn and <a href="/wiki/Paul_Harteck" title="Paul Harteck">Paul Harteck</a> were physicists. It was here that they heard the news of the <a href="/wiki/Atomic_bombings_of_Hiroshima_and_Nagasaki" title="Atomic bombings of Hiroshima and Nagasaki">atomic bombings of Hiroshima and Nagasaki</a>. Unwilling to accept that they were years behind the Americans, and unaware that their conversations were being recorded, many of them said in conversations, that they had never wanted their nuclear weapons program to succeed in the first place. Hahn did not believe them. Hahn was still there when his Nobel Prize was announced in November 1945. The Farm Hall scientists would spend the rest of their lives attempting to rehabilitate the image of German science that had been tarnished by the Nazi period.<a href="#cite_note-The_Politics_of_Memory-134">[134]</a><a href="#cite_note-FOOTNOTEYruma2008132–137-135">[135]</a> Inconvenient details like the thousands of female slave labourers from <a href="/wiki/Sachsenhausen_concentration_camp" title="Sachsenhausen concentration camp">Sachsenhausen concentration camp</a> who mined uranium ore for their experiments were swept under the rug.<a href="#cite_note-FOOTNOTEBernstein2001122-136">[136]</a> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Lise_Meitner_(1878-1968),_standing_at_meeting_with_Arthur_H._Compton_and_Katherine_Cornell_(3322794666).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Lise_Meitner_%281878-1968%29%2C_standing_at_meeting_with_Arthur_H._Compton_and_Katherine_Cornell_%283322794666%29.jpg/220px-Lise_Meitner_%281878-1968%29%2C_standing_at_meeting_with_Arthur_H._Compton_and_Katherine_Cornell_%283322794666%29.jpg" decoding="async" width="220" height="178" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Lise_Meitner_%281878-1968%29%2C_standing_at_meeting_with_Arthur_H._Compton_and_Katherine_Cornell_%283322794666%29.jpg/330px-Lise_Meitner_%281878-1968%29%2C_standing_at_meeting_with_Arthur_H._Compton_and_Katherine_Cornell_%283322794666%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Lise_Meitner_%281878-1968%29%2C_standing_at_meeting_with_Arthur_H._Compton_and_Katherine_Cornell_%283322794666%29.jpg/440px-Lise_Meitner_%281878-1968%29%2C_standing_at_meeting_with_Arthur_H._Compton_and_Katherine_Cornell_%283322794666%29.jpg 2x" data-file-width="3970" data-file-height="3211" /></a><figcaption>Lise Meitner in 1946 with physicist <a href="/wiki/Arthur_H._Compton" class="mw-redirect" title="Arthur H. Compton">Arthur H. Compton</a> and actress <a href="/wiki/Katharine_Cornell" title="Katharine Cornell">Katharine Cornell</a></figcaption></figure> For Hahn, this necessarily involved asserting his claim of the discovery of fission for himself, for chemistry, and for Germany. He used his Nobel Prize acceptance speech to assert this narrative,<a href="#cite_note-The_Politics_of_Memory-134">[134]</a><a href="#cite_note-FOOTNOTEYruma2008132–137-135">[135]</a> so he mentioned both Meitner's and Straßmann's involvements in his Nobel lecture. Hahn's message resonated strongly in Germany, where he was revered as the proverbial <a href="/wiki/Good_German" title="Good German">good German</a>, a decent man who had been a staunch opponent of the Nazi regime, but had remained in Germany where he had pursued pure science. As president of the <a href="/wiki/Max_Planck_Society" title="Max Planck Society">Max Planck Society</a> from 1946 to 1960, he projected an image of German science as undiminished in brilliance and untainted by Nazism to an audience that wanted to believe it.<a href="#cite_note-An_Inconvenient_History-74">[74]</a> After the Second World War, Hahn came out strongly against the use of nuclear energy for military purposes. He saw the application of his scientific discoveries to such ends as a misuse, or even a crime. Lawrence Badash wrote: "His wartime recognition of the perversion of science for the construction of weapons and his postwar activity in planning the direction of his country's scientific endeavours now inclined him increasingly toward being a spokesman for social responsibility."<a href="#cite_note-FOOTNOTEBadash1983176-137">[137]</a> In contrast, in the immediate aftermath of the war Meitner and Frisch were hailed as the discoverers of fission in English-speaking countries. Japan was seen as a <a href="/wiki/Puppet_state" title="Puppet state">puppet state</a> of Germany and the destruction of Hiroshima and Nagasaki as poetic justice for the persecution of the Jewish people.<a href="#cite_note-FOOTNOTEYruma2008150–154,_160-138">[138]</a><a href="#cite_note-FOOTNOTEHill2003120–123-139">[139]</a> In January 1946, Meitner toured the United States, where she gave lectures and received <a href="/wiki/Honorary_degree" title="Honorary degree">honorary degrees</a>. She attended a cocktail party for <a href="/wiki/Lieutenant_General_(United_States)" class="mw-redirect" title="Lieutenant General (United States)">Lieutenant General</a> <a href="/wiki/Leslie_Groves" title="Leslie Groves">Leslie Groves</a>, the director of the <a href="/wiki/Manhattan_Project" title="Manhattan Project">Manhattan Project</a> (who gave her sole credit for the discovery of fission in his 1962 memoirs), and was named Woman of the Year by the <a href="/wiki/Women%27s_National_Press_Club" class="mw-redirect" title="Women's National Press Club">Women's National Press Club</a>. At the reception for this award, she sat next to the <a href="/wiki/President_of_the_United_States" title="President of the United States">President of the United States</a>, <a href="/wiki/Harry_S._Truman" title="Harry S. Truman">Harry S. Truman</a>. But Meitner did not enjoy public speaking, especially in English, nor did she relish the role of a celebrity, and she declined the offer of a visiting professorship at <a href="/wiki/Wellesley_College" title="Wellesley College">Wellesley College</a>.<a href="#cite_note-FOOTNOTEGroves19625-140">[140]</a><a href="#cite_note-FOOTNOTEYruma2008161–164-141">[141]</a> Hahn nominated Meitner and Frisch for the Nobel Prize in Physics in 1948.<a href="#cite_note-142">[142]</a> He and Meitner remained close friends after the war.<a href="#cite_note-143">[143]</a> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Dahlem_Thielallee_Hahn-Meitner-Bau-2.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/12/Dahlem_Thielallee_Hahn-Meitner-Bau-2.JPG/170px-Dahlem_Thielallee_Hahn-Meitner-Bau-2.JPG" decoding="async" width="170" height="263" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/12/Dahlem_Thielallee_Hahn-Meitner-Bau-2.JPG/255px-Dahlem_Thielallee_Hahn-Meitner-Bau-2.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/12/Dahlem_Thielallee_Hahn-Meitner-Bau-2.JPG/340px-Dahlem_Thielallee_Hahn-Meitner-Bau-2.JPG 2x" data-file-width="1879" data-file-height="2910" /></a><figcaption>Plaque commemorating Hahn and Strassmann's discovery of fission in Berlin (unveiled in 1956)</figcaption></figure> In 1966, the <a href="/wiki/United_States_Atomic_Energy_Commission" title="United States Atomic Energy Commission">United States Atomic Energy Commission</a> jointly awarded the <a href="/wiki/Enrico_Fermi_Award" title="Enrico Fermi Award">Enrico Fermi Award</a> to Hahn, Strassmann and Meitner for their discovery of fission. The ceremony was held in the <a href="/wiki/Hofburg" title="Hofburg">Hofburg</a> palace in Vienna.<a href="#cite_note-144">[144]</a> It was the first time that the Enrico Fermi Prize had been awarded to non-Americans, and the first time it was presented to a woman.<a href="#cite_note-FOOTNOTEHahn1966183-145">[145]</a> Meitner's diploma bore the words: "For pioneering research in the naturally occurring radioactivities and extensive experimental studies leading to the discovery of fission".<a href="#cite_note-146">[146]</a> Hahn's diploma was slightly different: "For pioneering research in the naturally occurring radioactivities and extensive experimental studies culminating in the discovery of fission."<a href="#cite_note-147">[147]</a> Hahn and Strassmann were present, but Meitner was too ill to attend, so Frisch accepted the award on her behalf.<a href="#cite_note-FOOTNOTESime1996379–380-148">[148]</a> During combined celebrations in Germany of the 100th birthdays of Einstein, Hahn, Meitner and von Laue in 1978, Hahn's narrative of the discovery of fission began to crumble. Hahn and Meitner had died in 1968, but Strassmann was still alive, and he asserted the importance of his analytical chemistry and Meitner's physics in the discovery, and their role as more than just assistants. A detailed biography of Strassmann appeared in 1981, a year after his death, and a prize-winning one of Meitner for young adults in 1986. Scientists questioned the focus on chemistry, historians challenged the accepted narrative of the Nazi period, and <a href="/wiki/Feminists" class="mw-redirect" title="Feminists">feminists</a> saw Meitner as yet another example of the <a href="/wiki/Matilda_effect" title="Matilda effect">Matilda effect</a>, where a woman had been airbrushed from the pages of history. By 1990, Meitner had been restored to the narrative, although her role remained contested, particularly in Germany.<a href="#cite_note-An_Inconvenient_History-74">[74]</a> <a href="/wiki/Carl_Friedrich_von_Weizs%C3%A4cker" title="Carl Friedrich von Weizsäcker">Weizsäcker</a>, a colleague of Hahn and Meitner during their time in Berlin, and a fellow inmate with Hahn in Farm Hall, strongly supported Hahn's role in the discovery of nuclear fission.<a href="#cite_note-Nobel_was_well_deserved-96">[96]</a> He told an audience that had gathered for the ceremonial inclusion of a bust of Meitner in the Ehrensaal (Hall of Fame) at the <a href="/wiki/Deutsches_Museum" title="Deutsches Museum">Deutsches Museum</a> in Munich on 4 July 1991 that neither Meitner nor physics had contributed to the discovery of fission, which, he declared, was "a discovery of Hahn's and not of Lise Meitner's."<a href="#cite_note-An_Inconvenient_History-74">[74]</a> <div class="mw-heading mw-heading2"><h2 id="Notes">Notes</h2>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=14" title="Edit section: Notes">edit</a>]</div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-Fermi_Nobel_Prize-1">^ <a href="#cite_ref-Fermi_Nobel_Prize_1-0">a</a> <a href="#cite_ref-Fermi_Nobel_Prize_1-1">b</a> <style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.nobelprize.org/prizes/physics/1938/summary/">"The Nobel Prize in Physics 1938"</a>. Nobel Media AB. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20200522211252/https://www.nobelprize.org/prizes/physics/1938/summary/">Archived</a> from the original on 22 May 2020. Retrieved 1 June 2020.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=The+Nobel+Prize+in+Physics+1938&rft.pub=Nobel+Media+AB&rft_id=https%3A%2F%2Fwww.nobelprize.org%2Fprizes%2Fphysics%2F1938%2Fsummary%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"> </li> <li id="cite_note-FOOTNOTEYruma200829–31-2"><a href="#cite_ref-FOOTNOTEYruma200829–31_2-0">^</a> <a href="#CITEREFYruma2008">Yruma 2008</a>, pp. 29–31. </li> <li id="cite_note-FOOTNOTERhodes198641–42-3"><a href="#cite_ref-FOOTNOTERhodes198641–42_3-0">^</a> <a href="#CITEREFRhodes1986">Rhodes 1986</a>, pp. 41–42. </li> <li id="cite_note-Badash-4"><a href="#cite_ref-Badash_4-0">^</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBadash1978" class="citation journal cs1">Badash, Lawrence (9 June 1978). "Radium, Radioactivity, and the Popularity of Scientific Discovery". 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Nature. 129 (3252): 312. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1932Natur.129Q.312C">1932Natur.129Q.312C</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1038%2F129312a0">10.1038/129312a0</a>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/0028-0836">0028-0836</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:4076465">4076465</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20180827202416/http://web.mit.edu/22.54/resources/Chadwick.pdf">Archived</a> (PDF) from the original on 27 August 2018. Retrieved 25 May 2020.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Nature&rft.atitle=Possible+Existence+of+a+Neutron&rft.volume=129&rft.issue=3252&rft.pages=312&rft.date=1932&rft_id=info%3Adoi%2F10.1038%2F129312a0&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A4076465%23id-name%3DS2CID&rft.issn=0028-0836&rft_id=info%3Abibcode%2F1932Natur.129Q.312C&rft.au=J.+Chadwick&rft_id=http%3A%2F%2Fweb.mit.edu%2F22.54%2Fresources%2FChadwick.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"> Subsequently, he communicated his findings in more detail in: <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFChadwick,_J.1932" class="citation journal cs1">Chadwick, J. (1932). <a rel="nofollow" class="external text" href="http://www.chemteam.info/Chem-History/Chadwick-1932/Chadwick-neutron.html">"The existence of a neutron"</a>. 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Retrieved 6 October 2008.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=The+Nobel+Prize+in+Chemistry+1944&rft.pub=Nobel+Foundation&rft_id=http%3A%2F%2Fnobelprize.org%2Fnobel_prizes%2Fchemistry%2Flaureates%2F1944%2Findex.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"> </li> <li id="cite_note-FOOTNOTESime1996326–327-131"><a href="#cite_ref-FOOTNOTESime1996326–327_131-0">^</a> <a href="#CITEREFSime1996">Sime 1996</a>, pp. 326–327. </li> <li id="cite_note-FOOTNOTEYruma200873-132"><a href="#cite_ref-FOOTNOTEYruma200873_132-0">^</a> <a href="#CITEREFYruma2008">Yruma 2008</a>, p. 73. </li> <li id="cite_note-Frisch_nominations-133"><a href="#cite_ref-Frisch_nominations_133-0">^</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.nobelprize.org/nomination/archive/show_people.php?id=3236">"Nomination Database: Otto Robert Frisch"</a>. Nobel Media AB. 9 June 2020. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20200609042919/https://www.nobelprize.org/nomination/archive/show_people.php?id=3236">Archived</a> from the original on 9 June 2020. Retrieved 9 June 2020.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Nomination+Database%3A+Otto+Robert+Frisch&rft.pub=Nobel+Media+AB&rft.date=2020-06-09&rft_id=https%3A%2F%2Fwww.nobelprize.org%2Fnomination%2Farchive%2Fshow_people.php%3Fid%3D3236&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"> </li> <li id="cite_note-The_Politics_of_Memory-134">^ <a href="#cite_ref-The_Politics_of_Memory_134-0">a</a> <a href="#cite_ref-The_Politics_of_Memory_134-1">b</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSime2006" class="citation journal cs1"><a href="/wiki/Ruth_Lewin_Sime" title="Ruth Lewin Sime">Sime, Ruth Lewin</a> (March 2006). "The Politics of Memory: Otto Hahn and the Third Reich". Physics in Perspective. 8 (1): 3–51. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2006PhP.....8....3S">2006PhP.....8....3S</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1007%2Fs00016-004-0248-5">10.1007/s00016-004-0248-5</a>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/1422-6944">1422-6944</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:119479637">119479637</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Physics+in+Perspective&rft.atitle=The+Politics+of+Memory%3A+Otto+Hahn+and+the+Third+Reich&rft.volume=8&rft.issue=1&rft.pages=3-51&rft.date=2006-03&rft_id=info%3Adoi%2F10.1007%2Fs00016-004-0248-5&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A119479637%23id-name%3DS2CID&rft.issn=1422-6944&rft_id=info%3Abibcode%2F2006PhP.....8....3S&rft.aulast=Sime&rft.aufirst=Ruth+Lewin&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"> </li> <li id="cite_note-FOOTNOTEYruma2008132–137-135">^ <a href="#cite_ref-FOOTNOTEYruma2008132–137_135-0">a</a> <a href="#cite_ref-FOOTNOTEYruma2008132–137_135-1">b</a> <a href="#CITEREFYruma2008">Yruma 2008</a>, pp. 132–137. </li> <li id="cite_note-FOOTNOTEBernstein2001122-136"><a href="#cite_ref-FOOTNOTEBernstein2001122_136-0">^</a> <a href="#CITEREFBernstein2001">Bernstein 2001</a>, p. 122. </li> <li id="cite_note-FOOTNOTEBadash1983176-137"><a href="#cite_ref-FOOTNOTEBadash1983176_137-0">^</a> <a href="#CITEREFBadash1983">Badash 1983</a>, p. 176. </li> <li id="cite_note-FOOTNOTEYruma2008150–154,_160-138"><a href="#cite_ref-FOOTNOTEYruma2008150–154,_160_138-0">^</a> <a href="#CITEREFYruma2008">Yruma 2008</a>, pp. 150–154, 160. </li> <li id="cite_note-FOOTNOTEHill2003120–123-139"><a href="#cite_ref-FOOTNOTEHill2003120–123_139-0">^</a> <a href="#CITEREFHill2003">Hill 2003</a>, pp. 120–123. </li> <li id="cite_note-FOOTNOTEGroves19625-140"><a href="#cite_ref-FOOTNOTEGroves19625_140-0">^</a> <a href="#CITEREFGroves1962">Groves 1962</a>, p. 5. </li> <li id="cite_note-FOOTNOTEYruma2008161–164-141"><a href="#cite_ref-FOOTNOTEYruma2008161–164_141-0">^</a> <a href="#CITEREFYruma2008">Yruma 2008</a>, pp. 161–164. </li> <li id="cite_note-142"><a href="#cite_ref-142">^</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1 cs1-prop-foreign-lang-source"><a rel="nofollow" class="external text" href="https://www.dpma.de/dpma/veroeffentlichungen/patentefrauen/lisemeitner/index.html">"Lise Meitner"</a> (in German). DPMA. Retrieved 13 August 2023.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Lise+Meitner&rft.pub=DPMA&rft_id=https%3A%2F%2Fwww.dpma.de%2Fdpma%2Fveroeffentlichungen%2Fpatentefrauen%2Flisemeitner%2Findex.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"> </li> <li id="cite_note-143"><a href="#cite_ref-143">^</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://engines.egr.uh.edu/episode/2278">"Meitner and Hahn"</a>. The Engines of Our Ingenuity. Retrieved 13 August 2023.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Meitner+and+Hahn&rft.pub=The+Engines+of+Our+Ingenuity&rft_id=https%3A%2F%2Fengines.egr.uh.edu%2Fepisode%2F2278&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"> </li> <li id="cite_note-144"><a href="#cite_ref-144">^</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation news cs1"><a rel="nofollow" class="external text" href="https://www.nytimes.com/1966/09/24/archives/europeans-receive-fermi-prize-for-nuclear-fission-research.html">"Europeans Receive Fermi Prize For Nuclear Fission Research"</a>. The New York Times. 24 September 1966. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20200610001139/https://www.nytimes.com/1966/09/24/archives/europeans-receive-fermi-prize-for-nuclear-fission-research.html">Archived</a> from the original on 10 June 2020. Retrieved 10 June 2020.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+New+York+Times&rft.atitle=Europeans+Receive+Fermi+Prize+For+Nuclear+Fission+Research&rft.date=1966-09-24&rft_id=https%3A%2F%2Fwww.nytimes.com%2F1966%2F09%2F24%2Farchives%2Feuropeans-receive-fermi-prize-for-nuclear-fission-research.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"> </li> <li id="cite_note-FOOTNOTEHahn1966183-145"><a href="#cite_ref-FOOTNOTEHahn1966183_145-0">^</a> <a href="#CITEREFHahn1966">Hahn 1966</a>, p. 183. </li> <li id="cite_note-146"><a href="#cite_ref-146">^</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://science.osti.gov/fermi/Award-Laureates/1960s/meitner">"Fermi Lise Meitner, 1966"</a>. U.S. DOE Office of Science. 28 December 2010. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20200712225418/https://science.osti.gov/fermi/Award-Laureates/1960s/meitner">Archived</a> from the original on 12 July 2020. Retrieved 12 July 2020.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Fermi+Lise+Meitner%2C+1966&rft.pub=U.S.+DOE+Office+of+Science&rft.date=2010-12-28&rft_id=https%3A%2F%2Fscience.osti.gov%2Ffermi%2FAward-Laureates%2F1960s%2Fmeitner&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"> </li> <li id="cite_note-147"><a href="#cite_ref-147">^</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://science.osti.gov/fermi/Award-Laureates/1960s/hahn">"Fermi Otto Hahn, 1966"</a>. U.S. DOE Office of Science. 28 December 2010. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20200803105432/https://science.osti.gov/fermi/Award-Laureates/1960s/hahn">Archived</a> from the original on 3 August 2020. Retrieved 12 July 2020.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Fermi+Otto+Hahn%2C+1966&rft.pub=U.S.+DOE+Office+of+Science&rft.date=2010-12-28&rft_id=https%3A%2F%2Fscience.osti.gov%2Ffermi%2FAward-Laureates%2F1960s%2Fhahn&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"> </li> <li id="cite_note-FOOTNOTESime1996379–380-148"><a href="#cite_ref-FOOTNOTESime1996379–380_148-0">^</a> <a href="#CITEREFSime1996">Sime 1996</a>, pp. 379–380. </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=15" title="Edit section: References">edit</a>]</div> <style data-mw-deduplicate="TemplateStyles:r1239549316">.mw-parser-output .refbegin{margin-bottom:0.5em}.mw-parser-output .refbegin-hanging-indents>ul{margin-left:0}.mw-parser-output .refbegin-hanging-indents>ul>li{margin-left:0;padding-left:3.2em;text-indent:-3.2em}.mw-parser-output .refbegin-hanging-indents ul,.mw-parser-output .refbegin-hanging-indents ul li{list-style:none}@media(max-width:720px){.mw-parser-output .refbegin-hanging-indents>ul>li{padding-left:1.6em;text-indent:-1.6em}}.mw-parser-output .refbegin-columns{margin-top:0.3em}.mw-parser-output .refbegin-columns ul{margin-top:0}.mw-parser-output .refbegin-columns li{page-break-inside:avoid;break-inside:avoid-column}@media screen{.mw-parser-output .refbegin{font-size:90%}}</style><div class="refbegin refbegin-columns references-column-width" style="column-width: 30em"> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFAmaldi2001" class="citation book cs1"><a href="/wiki/Ugo_Amaldi_(physicist)" title="Ugo Amaldi (physicist)">Amaldi, Ugo</a> (2001). "Nuclear Physics from the Nineteen Thirties to the Present Day". In Bernardini, C.; Bonolis, Luisa (eds.). Enrico Fermi: His Work and Legacy. Bologna: Società Italiana di Fisica: Springer. pp. 151–176. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-88-7438-015-2" title="Special:BookSources/978-88-7438-015-2"><bdi>978-88-7438-015-2</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/56686431">56686431</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Nuclear+Physics+from+the+Nineteen+Thirties+to+the+Present+Day&rft.btitle=Enrico+Fermi%3A+His+Work+and+Legacy&rft.place=Bologna&rft.pages=151-176&rft.pub=Societ%C3%A0+Italiana+di+Fisica%3A+Springer&rft.date=2001&rft_id=info%3Aoclcnum%2F56686431&rft.isbn=978-88-7438-015-2&rft.aulast=Amaldi&rft.aufirst=Ugo&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBadash1983" class="citation book cs1">Badash, Lawrence (1983). "Otto Hahn, Science, and Social Responsibility". In Shea, William R. (ed.). Otto Hahn and the Rise of Nuclear Physics. The University of Western Ontario Series in the Philosophy of Science. Volume 22. Dordrecht / Boston / Lancaster: D. Reidel Publishing Company. pp. 167–180. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/90-277-1584-X" title="Special:BookSources/90-277-1584-X"><bdi>90-277-1584-X</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/797094010">797094010</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Otto+Hahn%2C+Science%2C+and+Social+Responsibility&rft.btitle=Otto+Hahn+and+the+Rise+of+Nuclear+Physics&rft.place=Dordrecht+%2F+Boston+%2F+Lancaster&rft.series=The+University+of+Western+Ontario+Series+in+the+Philosophy+of+Science.+Volume+22&rft.pages=167-180&rft.pub=D.+Reidel+Publishing+Company&rft.date=1983&rft_id=info%3Aoclcnum%2F797094010&rft.isbn=90-277-1584-X&rft.aulast=Badash&rft.aufirst=Lawrence&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBernstein2001" class="citation book cs1"><a href="/wiki/Jeremy_Bernstein" title="Jeremy Bernstein">Bernstein, Jeremy</a> (2001). <a rel="nofollow" class="external text" href="https://archive.org/details/hitlersuraniumcl00bern">Hitler's Uranium Club: The Secret Recordings at Farm Hall</a> (2nd ed.). New York: Springer-Verlag. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-387-95089-1" title="Special:BookSources/978-0-387-95089-1"><bdi>978-0-387-95089-1</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/7324621011">7324621011</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Hitler%27s+Uranium+Club%3A+The+Secret+Recordings+at+Farm+Hall&rft.place=New+York&rft.edition=2nd&rft.pub=Springer-Verlag&rft.date=2001&rft_id=info%3Aoclcnum%2F7324621011&rft.isbn=978-0-387-95089-1&rft.aulast=Bernstein&rft.aufirst=Jeremy&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fhitlersuraniumcl00bern&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFClark1961" class="citation book cs1"><a href="/wiki/Ronald_W._Clark" title="Ronald W. Clark">Clark, Ronald W.</a> (1961). The Birth of the Bomb: Britain's Part in the Weapon that Changed the World. London: Phoenix House. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/824335">824335</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Birth+of+the+Bomb%3A+Britain%27s+Part+in+the+Weapon+that+Changed+the+World&rft.place=London&rft.pub=Phoenix+House&rft.date=1961&rft_id=info%3Aoclcnum%2F824335&rft.aulast=Clark&rft.aufirst=Ronald+W.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFFrisch1979" class="citation book cs1"><a href="/wiki/Otto_Robert_Frisch" title="Otto Robert Frisch">Frisch, Otto</a> (1979). What Little I Remember. Cambridge: Cambridge University Press. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-521-40583-6" title="Special:BookSources/978-0-521-40583-6"><bdi>978-0-521-40583-6</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/861058137">861058137</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=What+Little+I+Remember&rft.place=Cambridge&rft.pub=Cambridge+University+Press&rft.date=1979&rft_id=info%3Aoclcnum%2F861058137&rft.isbn=978-0-521-40583-6&rft.aulast=Frisch&rft.aufirst=Otto&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGroves1962" class="citation book cs1"><a href="/wiki/Leslie_Groves" title="Leslie Groves">Groves, Leslie</a> (1962). <a rel="nofollow" class="external text" href="https://archive.org/details/nowitcanbetolds00grov">Now It Can Be Told: The Story of the Manhattan Project</a>. New York: Harper. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-306-70738-4" title="Special:BookSources/978-0-306-70738-4"><bdi>978-0-306-70738-4</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/537684">537684</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Now+It+Can+Be+Told%3A+The+Story+of+the+Manhattan+Project&rft.place=New+York&rft.pub=Harper&rft.date=1962&rft_id=info%3Aoclcnum%2F537684&rft.isbn=978-0-306-70738-4&rft.aulast=Groves&rft.aufirst=Leslie&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fnowitcanbetolds00grov&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHahn1966" class="citation book cs1"><a href="/wiki/Otto_Hahn" title="Otto Hahn">Hahn, Otto</a> (1966). Otto Hahn: A Scientific Autobiography. Translated by Ley, Willy. New York: Charles Scribner's Sons. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/937577181">937577181</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Otto+Hahn%3A+A+Scientific+Autobiography&rft.place=New+York&rft.pub=Charles+Scribner%27s+Sons&rft.date=1966&rft_id=info%3Aoclcnum%2F937577181&rft.aulast=Hahn&rft.aufirst=Otto&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHill2003" class="citation book cs1">Hill, Richard F. (2003). Hitler Attacks Pearl Harbor: Why the United States Declared War on Germany. Boulder, Colorado: Lynne Rienner Publishers. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-58826-126-7" title="Special:BookSources/978-1-58826-126-7"><bdi>978-1-58826-126-7</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/471740037">471740037</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Hitler+Attacks+Pearl+Harbor%3A+Why+the+United+States+Declared+War+on+Germany&rft.place=Boulder%2C+Colorado&rft.pub=Lynne+Rienner+Publishers&rft.date=2003&rft_id=info%3Aoclcnum%2F471740037&rft.isbn=978-1-58826-126-7&rft.aulast=Hill&rft.aufirst=Richard+F.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHook2002" class="citation book cs1">Hook, Ernest B. (2002). "Interdisciplinary Dissonance and Prematurity: Ida Noddack's Suggestion of Nuclear Fission". In Hook, Ernest B. (ed.). Prematurity in Scientific Discovery: On Resistance and Neglect. Berkeley and Los Angeles: University of California Press. pp. 124–148. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-520-23106-1" title="Special:BookSources/978-0-520-23106-1"><bdi>978-0-520-23106-1</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/883986381">883986381</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Interdisciplinary+Dissonance+and+Prematurity%3A+Ida+Noddack%E2%80%99s+Suggestion+of+Nuclear+Fission&rft.btitle=Prematurity+in+Scientific+Discovery%3A+On+Resistance+and+Neglect&rft.place=Berkeley+and+Los+Angeles&rft.pages=124-148&rft.pub=University+of+California+Press&rft.date=2002&rft_id=info%3Aoclcnum%2F883986381&rft.isbn=978-0-520-23106-1&rft.aulast=Hook&rft.aufirst=Ernest+B.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFLibby1979" class="citation book cs1"><a href="/wiki/Leona_Woods" title="Leona Woods">Libby, Leona Marshall</a> (1979). <a rel="nofollow" class="external text" href="https://archive.org/details/uraniumpeople0000libb">The Uranium People</a>. New York: Crane, Russak. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-8448-1300-4" title="Special:BookSources/978-0-8448-1300-4"><bdi>978-0-8448-1300-4</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/4665032">4665032</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Uranium+People&rft.place=New+York&rft.pub=Crane%2C+Russak&rft.date=1979&rft_id=info%3Aoclcnum%2F4665032&rft.isbn=978-0-8448-1300-4&rft.aulast=Libby&rft.aufirst=Leona+Marshall&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Furaniumpeople0000libb&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRhodes1986" class="citation book cs1"><a href="/wiki/Richard_Rhodes" title="Richard Rhodes">Rhodes, Richard</a> (1986). <a href="/wiki/The_Making_of_the_Atomic_Bomb" title="The Making of the Atomic Bomb">The Making of the Atomic Bomb</a>. New York: Simon and Schuster. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-671-65719-2" title="Special:BookSources/978-0-671-65719-2"><bdi>978-0-671-65719-2</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/224864936">224864936</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Making+of+the+Atomic+Bomb&rft.place=New+York&rft.pub=Simon+and+Schuster&rft.date=1986&rft_id=info%3Aoclcnum%2F224864936&rft.isbn=978-0-671-65719-2&rft.aulast=Rhodes&rft.aufirst=Richard&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSime1996" class="citation book cs1"><a href="/wiki/Ruth_Lewin_Sime" title="Ruth Lewin Sime">Sime, Ruth Lewin</a> (1996). <a rel="nofollow" class="external text" href="https://archive.org/details/lisemeitnerlifei00sime">Lise Meitner: A Life in Physics</a>. Berkeley and Los Angeles: University of California Press. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-520-08906-8" title="Special:BookSources/978-0-520-08906-8"><bdi>978-0-520-08906-8</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/32893857">32893857</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Lise+Meitner%3A+A+Life+in+Physics&rft.place=Berkeley+and+Los+Angeles&rft.pub=University+of+California+Press&rft.date=1996&rft_id=info%3Aoclcnum%2F32893857&rft.isbn=978-0-520-08906-8&rft.aulast=Sime&rft.aufirst=Ruth+Lewin&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Flisemeitnerlifei00sime&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFWheelerFord1998" class="citation book cs1"><a href="/wiki/John_Archibald_Wheeler" title="John Archibald Wheeler">Wheeler, John Archibald</a>; <a href="/wiki/Kenneth_W._Ford" title="Kenneth W. Ford">Ford, Kenneth</a> (1998). <a rel="nofollow" class="external text" href="https://archive.org/details/geonsblackholesq00whee">Geons, Black Holes, and Quantum Foam: A Life in Physics</a>. New York: W.W. Norton & Co. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-393-04642-7" title="Special:BookSources/978-0-393-04642-7"><bdi>978-0-393-04642-7</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/1014741658">1014741658</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Geons%2C+Black+Holes%2C+and+Quantum+Foam%3A+A+Life+in+Physics&rft.place=New+York&rft.pub=W.W.+Norton+%26+Co&rft.date=1998&rft_id=info%3Aoclcnum%2F1014741658&rft.isbn=978-0-393-04642-7&rft.aulast=Wheeler&rft.aufirst=John+Archibald&rft.au=Ford%2C+Kenneth&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fgeonsblackholesq00whee&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFYruma2008" class="citation thesis cs1">Yruma, Jeris Stueland (November 2008). How Experiments Are Remembered: The Discovery of Nuclear Fission, 1938–1968 (PhD thesis). Princeton, New Jersey: Princeton University. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/297148928">297148928</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.title=How+Experiments+Are+Remembered%3A+The+Discovery+of+Nuclear+Fission%2C+1938%E2%80%931968&rft.degree=PhD&rft.inst=Princeton+University&rft.date=2008-11&rft_id=info%3Aoclcnum%2F297148928&rft.aulast=Yruma&rft.aufirst=Jeris+Stueland&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li></ul> </div> <div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2>[<a href="/w/index.php?title=Discovery_of_nuclear_fission&action=edit&section=16" title="Edit section: Further reading">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239549316"><div class="refbegin" style=""> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation book cs1">Graetzer, Hans D.; Anderson, David L. (1971). The Discovery of Nuclear Fission: A Documentary History. New York: Van Nostrand-Reinhold. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/1130319295">1130319295</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Discovery+of+Nuclear+Fission%3A+A+Documentary+History&rft.place=New+York&rft.pub=Van+Nostrand-Reinhold&rft.date=1971&rft_id=info%3Aoclcnum%2F1130319295&rft.aulast=Graetzer&rft.aufirst=Hans+D.&rft.au=Anderson%2C+David+L.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADiscovery+of+nuclear+fission" class="Z3988"></li></ul> </div> <style data-mw-deduplicate="TemplateStyles:r1130092004">.mw-parser-output .portal-bar{font-size:88%;font-weight:bold;display:flex;justify-content:center;align-items:baseline}.mw-parser-output .portal-bar-bordered{padding:0 2em;background-color:#fdfdfd;border:1px solid #a2a9b1;clear:both;margin:1em auto 0}.mw-parser-output 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class="navbox-group" style="width:1%"><a href="/wiki/Classical_physics" title="Classical physics">Classical physics</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/History_of_astronomy" title="History of astronomy">Astronomy</a> <ul><li><a href="/wiki/Timeline_of_astronomy" title="Timeline of astronomy">timeline</a></li></ul></li> <li><a href="/wiki/History_of_electromagnetic_theory" title="History of electromagnetic theory">Electromagnetism</a> <ul><li><a href="/wiki/Timeline_of_electromagnetism_and_classical_optics" title="Timeline of electromagnetism and classical optics">timeline</a></li> <li><a href="/wiki/History_of_electrical_engineering" title="History of electrical engineering">Electrical engineering</a></li> <li><a href="/wiki/History_of_Maxwell%27s_equations" title="History of Maxwell's equations">Maxwell's equations</a></li></ul></li> <li><a href="/wiki/History_of_fluid_mechanics" title="History of fluid mechanics">Fluid mechanics</a> <ul><li><a href="/wiki/Timeline_of_fluid_and_continuum_mechanics" title="Timeline of fluid and continuum mechanics">timeline</a></li> <li><a href="/wiki/History_of_aerodynamics" title="History of aerodynamics">Aerodynamics</a></li></ul></li> <li><a href="/wiki/History_of_classical_field_theory" title="History of classical field theory">Field theory</a></li> <li><a href="/wiki/History_of_gravitational_theory" title="History of gravitational theory">Gravitational theory</a> <ul><li><a href="/wiki/Timeline_of_gravitational_physics_and_relativity" title="Timeline of gravitational physics and relativity">timeline</a></li></ul></li> <li><a href="/wiki/History_of_materials_science" title="History of materials science">Material science</a> <ul><li><a href="/wiki/Timeline_of_materials_technology" title="Timeline of materials technology">timeline</a></li> <li><a href="/wiki/History_of_metamaterials" title="History of metamaterials">Metamaterials</a></li></ul></li> <li><a href="/wiki/History_of_classical_mechanics" title="History of classical mechanics">Mechanics</a> <ul><li><a href="/wiki/Timeline_of_classical_mechanics" title="Timeline of classical mechanics">timeline</a></li> <li><a href="/wiki/History_of_variational_principles_in_physics" title="History of variational principles in physics">Variational principles</a></li></ul></li> <li><a href="/wiki/History_of_optics" title="History of optics">Optics</a> <ul><li><a href="/wiki/History_of_spectroscopy" title="History of spectroscopy">Spectroscopy</a></li></ul></li> <li><a href="/wiki/History_of_thermodynamics" title="History of thermodynamics">Thermodynamics</a> <ul><li><a href="/wiki/Timeline_of_thermodynamics" title="Timeline of thermodynamics">timeline</a></li> <li><a href="/wiki/History_of_energy" title="History of energy">Energy</a></li> <li><a href="/wiki/History_of_entropy" title="History of entropy">Entropy</a></li> <li><a href="/wiki/History_of_perpetual_motion_machines" title="History of perpetual motion machines">Perpetual motion</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Modern_physics" title="Modern physics">Modern physics</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li>Computational physics <ul><li><a href="/wiki/Timeline_of_computational_physics" title="Timeline of computational physics">timeline</a></li></ul></li> <li>Condensed matter <ul><li><a href="/wiki/Timeline_of_condensed_matter_physics" title="Timeline of condensed matter physics">timeline</a></li> <li><a href="/wiki/History_of_superconductivity" title="History of superconductivity">Superconductivity</a></li></ul></li> <li>Cosmology <ul><li><a href="/wiki/Timeline_of_cosmological_theories" title="Timeline of cosmological theories">timeline</a></li> <li><a href="/wiki/History_of_the_Big_Bang_theory" title="History of the Big Bang theory">Big Bang theory</a></li></ul></li> <li><a href="/wiki/History_of_general_relativity" title="History of general relativity">General relativity</a> <ul><li><a href="/wiki/Tests_of_general_relativity" title="Tests of general relativity">tests</a></li></ul></li> <li><a href="/wiki/History_of_geophysics" title="History of geophysics">Geophysics</a></li> <li>Nuclear physics <ul><li><a class="mw-selflink selflink">Fission</a></li> <li><a href="/wiki/History_of_nuclear_fusion" title="History of nuclear fusion">Fusion</a></li> <li><a href="/wiki/History_of_nuclear_power" title="History of nuclear power">Power</a></li> <li><a href="/wiki/History_of_nuclear_weapons" title="History of nuclear weapons">Weapons</a></li></ul></li> <li><a href="/wiki/History_of_quantum_mechanics" title="History of quantum mechanics">Quantum mechanics</a> <ul><li><a href="/wiki/Timeline_of_quantum_mechanics" title="Timeline of quantum mechanics">timeline</a></li> <li><a href="/wiki/History_of_atomic_theory" title="History of atomic theory">Atoms</a></li> <li><a href="/wiki/History_of_molecular_theory" title="History of molecular theory">Molecules</a></li> <li><a href="/wiki/History_of_quantum_field_theory" title="History of quantum field theory">Quantum field theory</a></li></ul></li> <li><a href="/wiki/History_of_subatomic_physics" title="History of subatomic physics">Subatomic physics</a> <ul><li><a href="/wiki/Timeline_of_atomic_and_subatomic_physics" title="Timeline of atomic and subatomic physics">timeline</a></li></ul></li> <li><a href="/wiki/History_of_special_relativity" title="History of special relativity">Special relativity</a> <ul><li><a href="/wiki/Timeline_of_special_relativity_and_the_speed_of_light" title="Timeline of special relativity and the speed of light">timeline</a></li> <li><a href="/wiki/History_of_Lorentz_transformations" title="History of Lorentz transformations">Lorentz transformations</a></li> <li><a href="/wiki/Tests_of_special_relativity" title="Tests of special relativity">tests</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Recent developments</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li>Quantum information <ul><li><a href="/wiki/Timeline_of_quantum_computing_and_communication" title="Timeline of quantum computing and communication">timeline</a></li></ul></li> <li><a href="/wiki/History_of_loop_quantum_gravity" title="History of loop quantum gravity">Loop quantum gravity</a></li> <li><a href="/wiki/History_of_nanotechnology" title="History of nanotechnology">Nanotechnology</a></li> <li><a href="/wiki/History_of_string_theory" title="History of string theory">String theory</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">On specific discoveries</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Discovery_of_cosmic_microwave_background_radiation" title="Discovery of cosmic microwave background radiation">Cosmic microwave background</a></li> <li><a href="/wiki/Discovery_of_graphene" title="Discovery of graphene">Graphene</a></li> <li><a href="/wiki/First_observation_of_gravitational_waves" title="First observation of gravitational waves">Gravitational waves</a></li> <li>Subatomic particles <ul><li><a href="/wiki/Timeline_of_particle_discoveries" title="Timeline of particle discoveries">timeline</a></li> <li><a href="/wiki/Search_for_the_Higgs_boson" title="Search for the Higgs boson">Higgs boson</a></li> <li><a href="/wiki/Discovery_of_the_neutron" title="Discovery of the neutron">Neutron</a></li></ul></li> <li><a href="/wiki/R%C3%B8mer%27s_determination_of_the_speed_of_light" title="Rømer's determination of the speed of light">Speed of light</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">By periods</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Copernican_Revolution" title="Copernican Revolution">Copernican Revolution</a></li> <li><a href="/wiki/Golden_age_of_physics" title="Golden age of physics">Golden age of physics</a></li> <li><a href="/wiki/Golden_age_of_cosmology" title="Golden age of cosmology">Golden age of cosmology</a></li> <li><a href="/wiki/Physics_in_the_medieval_Islamic_world" title="Physics in the medieval Islamic world">Medieval Islamic world</a> <ul><li><a href="/wiki/Astronomy_in_the_medieval_Islamic_world" title="Astronomy in the medieval Islamic world">Astronomy</a></li></ul></li> <li><a href="/wiki/Noisy_intermediate-scale_quantum_era" title="Noisy intermediate-scale quantum era">Noisy intermediate-scale quantum era</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">By groups</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Harvard_Computers" title="Harvard Computers">Harvard Computers</a></li> <li><a href="/wiki/The_Martians_(scientists)" title="The Martians (scientists)">The Martians</a></li> <li><a href="/wiki/Oxford_Calculators" title="Oxford Calculators">Oxford Calculators</a></li> <li><a href="/wiki/Via_Panisperna_boys" title="Via Panisperna boys">Via Panisperna boys</a></li> <li><a href="/wiki/Women_in_physics" title="Women in physics">Women in physics</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Scientific disputes</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bohr%E2%80%93Einstein_debates" title="Bohr–Einstein debates">Bohr–Einstein</a></li> <li><a href="/wiki/Chandrasekhar%E2%80%93Eddington_dispute" title="Chandrasekhar–Eddington dispute">Chandrasekhar–Eddington</a></li> <li><a href="/wiki/Galileo_affair" title="Galileo affair">Galileo affair</a></li> <li><a href="/wiki/Leibniz%E2%80%93Newton_calculus_controversy" title="Leibniz–Newton calculus controversy">Leibniz–Newton</a></li> <li><a href="/wiki/Mechanical_equivalent_of_heat" title="Mechanical equivalent of heat">Joule–von Mayer</a></li> <li><a href="/wiki/Great_Debate_(astronomy)" title="Great Debate (astronomy)">Shapley–Curtis</a></li> <li>Relativity priority <ul><li><a href="/wiki/Relativity_priority_dispute" title="Relativity priority dispute">Special relativity</a></li> <li><a href="/wiki/General_relativity_priority_dispute" title="General relativity priority dispute">General relativity</a></li></ul></li> <li><a href="/wiki/Transfermium_Wars" title="Transfermium Wars">Transfermium Wars</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> 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alt="Powered by MediaWiki" width="88" height="31" loading="lazy"></a></li> </ul> </footer> </div> </div> </div> <div class="vector-settings" id="p-dock-bottom"> <ul></ul> </div><script>(RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgHostname":"mw-web.codfw.main-5cd4cd96d5-qdz72","wgBackendResponseTime":169,"wgPageParseReport":{"limitreport":{"cputime":"1.835","walltime":"2.143","ppvisitednodes":{"value":15762,"limit":1000000},"postexpandincludesize":{"value":374728,"limit":2097152},"templateargumentsize":{"value":24926,"limit":2097152},"expansiondepth":{"value":14,"limit":100},"expensivefunctioncount":{"value":8,"limit":500},"unstrip-depth":{"value":1,"limit":20},"unstrip-size":{"value":395971,"limit":5000000},"entityaccesscount":{"value":0,"limit":400},"timingprofile":["100.00% 1745.478 1 -total"," 39.00% 680.700 1 Template:Reflist"," 22.58% 394.107 58 Template:Cite_journal"," 18.06% 315.270 84 Template:Sfn"," 9.59% 167.328 17 Template:Cite_web"," 8.96% 156.378 1 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