Discovery of nuclear fission

Nuclear fission was discovered in December 1938 by Otto Hahn and Fritz Strassmann at the Kaiser Wilhelm Institute for Chemistry in Berlin. They bombarded uranium with slow neutrons, and discovered that barium had been produced. Hahn wrote to his colleague Lise Meitner in Sweden, who, with her nephew Otto Frisch, proved that the uranium nucleus had been split. They published their findings in Nature in February 1939. This phenomenon was a new type of nuclear disintegration, one more powerful than any seen before. Frisch and Meitner calculated that the energy released by each disintegration was approximately 200 megaelectronvolts. By analogy with the division of biological cells, Frisch named the process "fission". Hahn was awarded the Nobel Prize in Chemistry for 1944 for the discovery.

The nuclear reaction theorised by Meitner and Frisch

The discovery came after forty years of investigation into the nature and properties of radioactivity and radioactive substances. The discovery of the neutron by James Chadwick in 1932 created a new means of nuclear transmutation. Enrico Fermi and his colleagues in Rome 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 ausonium and hesperium. Fermi won the 1938 Nobel Prize in Physics 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".[1] However, not all were convinced by Fermi's analysis of his results. Ida Noddack notably suggested that instead of creating a new, heavier element 93, that it was conceivable that the nucleus had broken up into large fragments, and Aristid von Grosse suggested that what Fermi's group had found was an isotope of protactinium.

This spurred the discoverers of the most stable isotope of protactinium, Hahn and Meitner, to conduct a four-year-long investigation into the process with their colleague Fritz Strassmann. After much hard work and many discoveries, they ultimately determined that what they were observing was fission, and that the new elements that Fermi had found were fission products. Their work overturned long-held beliefs in physics, and paved the way for the ultimate discovery of the real elements 93 and 94, for the discovery of fission in other elements, and for the determination of the role of the uranium-235 in that of uranium. Niels Bohr and John Wheeler reworked the liquid drop model to explain the mechanism of fission, and the discovery that a nuclear chain reaction was possible led to the development of nuclear power and nuclear weapons.

Background

Radioactivity

In the last years of the 19th century, scientists frequently experimented with the cathode-ray tube, which by then had become a standard piece of laboratory equipment. A common practice was to aim the cathode rays at various substances and to see what happened. Wilhelm Röntgen had a screen coated with barium platinocyanide that would fluoresce when exposed to cathode rays. screen. On 8 November 1895, he noticed that even though his cathode ray tube was not pointed at his screen, and it was covered in black cardboard, it still fluoresced. He soon became convinced that he had discovered a new type of rays, which are today called X-rays. The following year Henri Becquerel was experimenting with fluorescent uranium salts, and wondered if they too might produce X-rays.[2] 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.[3]

The periodic table circa 1930

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,[4] Marie Curie tested samples of as many elements and minerals as she could find for signs of Becquerel rays, and in April 1898 also found them in thorium. She gave the phenomenon the name "radioactivity".[5] Along with Pierre Curie and Gustave Bémont, she began investigating pitchblende, 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 bismuth, but strongly radioactive, and in July 1898 they published a paper in which they concluded that it was a new element, which they named "polonium". 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 "radium". 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 radium chloride, and they never did manage to isolate polonium.[6]

In 1898, Ernest Rutherford 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.[7] Subsequently, Paul Villard discovered a third type of Becquerel radiation which, following Rutherford's scheme, were called "gamma rays", and Curie noted that radium also produced a radioactive gas. Identifying the gas chemically proved frustrating; Rutherford and Frederick Soddy found it to be inert, much like argon. It later came to be known as radon. Rutherford identified beta rays as cathode rays (electrons), and hypothesised—and in 1909 with Thomas Royds proved—that alpha particles were helium.[8][9] 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 half life.[8][10] In 1903, Soddy and Margaret Todd applied the term "isotope" to atoms that were chemically and spectroscopically indistinct but had different radioactive half-lives.[11][12] Rutherford proposed a model of the atom in which a very small, dense and positively charged nucleus of protons was surrounded by orbiting, negatively charged electrons (the Rutherford model).[13] Niels Bohr improved upon this in 1913 by reconciling it with the quantum behaviour of electrons (the Bohr model).[14][15][16]

Protactinium

The decay chain of actinium. Alpha decay shifts two elements down; beta decay shifts one element up.

In 1913, Soddy and Kasimir Fajans independently observed that alpha decay caused atoms to shift down two places in the periodic table, 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, actinium 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 Dmitri Mendeleev) as "ekatantalium", would be an alpha emitter with chemical properties similar to tantalium (now known as tantalum).[17][18][19] It was not long before Fajans and Oswald Helmuth Göhring discovered it as a decay product of a beta-emitting product of thorium. Based on the radioactive displacement law of Fajans and Soddy, 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.[17]

Two scientists at the Kaiser-Wilhelm-Institute (KWI) in Berlin-Dahlem took up the challenge of finding the missing isotope. Otto Hahn had graduated from the University of Marburg as an organic chemist, but had been a post-doctoral researcher at University College London under Sir William Ramsay, and under Rutherford at McGill University, where he had studied radioactive isotopes. In 1906, he returned to Germany, where he became an assistant to Emil Fischer at the University of Berlin. At McGill he had become accustomed to working closely with a physicist, so he teamed up with Lise Meitner, who had received her doctorate from the University of Vienna in 1906, and had then moved to Berlin to study physics under Max Planck at the Friedrich-Wilhelms-Universität. Hahn was accustomed to collaborating with a physicist, and Meitner found Hahn, who was her own age, less intimidating than older, more distinguished colleagues.[20]

In 1913, Hahn and Meitner moved to the recently-established Kaiser Wilhelm Institute for Chemistry, where they would become the heads of their own laboratories, with their own students, research programs and equipment.[20] 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.[17]

The work was interrupted by the outbreak of the First World War in 1914. Hahn was called up into the German Army, and Meitner became an X-ray nurse, working in Austrian Army hospitals. She returned to the Kaiser Wilhelm Institute in October 1916, when not only Hahn, but most of the students, laboratory assistants and technicians had been called up. Meitner therefore had to do everything herself, aided only briefly by Hahn when he came home on leave. By December 1917 she was able to isolate the substance, and after further work was able to prove that it was indeed the missing isotope. She submitted her findings for publication in March 1918.[17]

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 naming the element protactinium, and assigning it the chemical symbol Pa. In June 1918, Soddy and John Cranston announced that they had extracted a sample of the isotope, but unlike Meitner were unable to describe its characteristics. They acknowledged Meitner's priority, and agreed to the name. The connection to uranium remained a mystery, as neither of the known isotopes of uranium decayed into protactinium. It remained unsolved until uranium-235 was discovered in 1929.[17][21]

Transmutation

Irène Curie and Frédéric Joliot in their Paris laboratory in 1935.

Patrick Blackett was able to accomplish nuclear transmutation of nitrogen into oxygen in 1925, using alpha particles directed at nitrogen (in modern notation):

14
7
N
+ 4
2
He
17
8
O
+ p

This was the first observation of a nuclear reaction, that is, a reaction in which particles from one decay are used to transform another atomic nucleus.[22] A fully artificial nuclear reaction and nuclear transmutation was achieved in 1932 by Ernest Walton and John Cockcroft, who used artificially accelerated protons against lithium, to break this nucleus into two alpha particles. The feat was popularly known as "splitting the atom", but was not nuclear fission.[23][24]

James Chadwick discovered the neutron in 1932, using an ingenious device literally made with sealing wax, through the reaction of beryllium with alpha particles:[25][26]

11
5
Be
+ 4
2
He
14
7
N
+ n

Irène Curie and Frédéric Joliot irradiated aluminium foil with alpha particles, they found that this results in a short-lived radioactive isotope of phosphorus with a half-life of around three minutes:

27
13
Al
+ 4
2
He
30
15
P
+ n

which then decays to a stable isotope of silicon

30
15
P
30
14
Si
+ e+

They noted that positron emission continued after the neutron emissions ceased. Not only had they discovered a new form of radioactive decay, 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.[27][28][29]

Chadwick noted that being electrically neutral, neutrons would be able to penetrate the nucleus more easily than protons or alpha particles.[30] Enrico Fermi and his colleagues in RomeEdoardo Amaldi, Oscar D'Agostino, Franco Rasetti and Emilio Segrè—picked up on this idea.[31] Rasetti visited Meitner's laboratory in 1931 and again in 1932, after Chadwick's discovery of the neutron. Meitner show him how to prepare a polonium-beryllium neutron source. One returning to Rome, Rasetti built Geiger counters and a cloud chamber 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 after Rasetti went on his Easter vacation before preparing the polonium-beryllium source, Fermi realised that since he was interested in the products that were produced, 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 is a sealed capsule. Moreover, radon was easily obtained; Giulio Cesare Trabacchi 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 a new batch.[31][32]

Enrico Fermi and his research group (the Via Panisperna boys), circa 1934. Left to right: Oscar D'Agostino, Emilio Segrè, Edoardo Amaldi, Franco Rasetti and Fermi

Working in assembly-line fashion, they started by irradiating water, and then progressed up the periodic table through lithium, beryllium, boron and carbon, without inducing any radioactivity. When they got to fluorine, they had their first success. Induced radioactivity was subsequently found through the neutron bombardment of 22 different elements.[33][34] 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.[32] When a new copy of La Ricerca Scientifica arrived at the Niels Bohr Institute in Copenhagen, her nephew, Otto Frisch, as the only physicist there who could read Italian, found himself in demand from colleagues demanding a translation. The Rome group had no samples of the rare earth metals, but at the Niels Bohr Institute George de Hevesy had a complete set of their oxides that had been given to him by Auergesellschaft, so de Hevesy and Hilde Levi carried out the process with them.[35]

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.[36] What they observed was a complex mixture of half lives. Following the displacement law, they checked for the presence of lead, bismuth, radium, actinium, thorium and protactinium (skipping the elements whose chemical properties were unknown), and (correctly) found no indication of any of them.[36] Fermi noted three type of reactions were caused by neutron irradiation: emission of an alpha particle (n, α); proton emission (n, p); and gamma emission (n, γ). Invariably, the new isotopes decayed by beta emission, which caused elements to move up the periodic table.[37]

Based in the table of the time, Fermi believed that element 93 was ekarhenium—the element below rhenium—with characteristics similar to manganese and rhenium. Such an element was found, and Fermi tentatively concluded that his experiments had created new elements with 93 and 94 protons,[38] which he dubbed ausonium and hesperium.[39][40] The results were published in Nature in June 1934.[38] However, in his 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."[38] (In retrospect, what they had detected was indeed an unknown rhenium-like element, but technetium, which lies between manganese and rhenium on the periodic table.[36])

Leo Szilard and Thomas A. Chalmers reported that neutrons generated by a gamma rays acting on beryllium were captured by iodine, a reaction that Fermi had also noted. When Meitner repeated their experiment, she founds 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.[41][42] Everyone had been thinking that energetic neutrons were required, because that was what was the case with alpha particles and protons, but that was required to overcome the coulomb barrier; the neutral 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 one in the same room. Fermi thought about this and tried placing a piece of paraffin wax 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. [43] 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.[36]

The current model of the nucleus was the liquid drop model first proposed by George Gamov in 1930.[44] His simple and elegant model was refined and developed by Carl Friedrich von Weizsäcker and, after the discovery of the neutron, by Werner Heisenberg and Niels Bohr, and it agreed closely with observations. In the model, the nucleons were held together in the smallest possible volume (a sphere) by the strong nuclear force, which was capable of overcoming the longer ranged coulomb electrical repulsion between the protons. The model remained in use for certain applications in the 21st century, when it attracted the attention of mathematicians interested in its properties,[45][46][47] but in its 1934 form it confirmed what physicists thought they already knew: that atoms were static, and that the odds of a collision chipping off more than an alpha particle were practically zero.[48]

Discovery

Objections

Fermi won the 1938 Nobel Prize in Physics 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".[1] However, not everyone was convinced by Fermi's analysis of his results. Ida Noddack suggested in September 1934 that instead of creating a new, heavier element 93, that:

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.[49]

Noddack's article was read by Fermi's team in Rome, Curie and Joliot in Paris, and Meitner and Hahn in Berlin.[36] However, the quoted objection comes some distance down, and is but one of several gaps she noted in Fermi's claim.[50] 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.[51] Noddack and her husband, Walter Noddack, were renowned chemists who had been nominated for the Nobel Prize in Chemistry 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 Carlo Perrier 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,[52] but Meitner was not afraid to tell Hahn Hahnchen, von Physik verstehst Du Nichts ("Hahn dear, of physics you understand nothing").[53] 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.[50]

Former Kaiser Wilhelm Institute for Chemistry building in Berlin. After the Second World War it became part of the Free University of Berlin. It was renamed the Otto Hahn Building in 1956, and the Hahn-Meitner Building in 2010.[54][55]

Nor was Noddack was not the only critic of Fermi's claim. Aristid von Grosse suggested that what Fermi had found was an isotope of protactinium.[56][57] 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.[58] "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."[59]

Hahn and Meiner were joined Fritz Strassman. Strassmann had received his doctorate an analytical chemistry from the Technical University of Hannover in 1929,[60] 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 Nazi Party 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 Society of German Chemists when it became part of the Nazi German Labour Front rather than become a member of Nazi-controlled organisation. As a result, he could neither work in the chemical industry nor receive his habilitation, 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.[61]

The 1933 Law for the Restoration of the Professional Civil Service removing 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.[62] However, she was dismissed from her adjunct professorship at the University of Berlin on the grounds that World War I service was not at the front, and she had not completed her habilitation until 1922.[63] Carl Bosch, the director IG Farben, a major sponsor of the Kaiser Wilhelm Institute, assured Meitner that her position there was safe.[62] Meitner, Hahn and Strassmann drew closer together personally as their anti-Nazi politics increasingly alienated them from the rest of the organisation.[61]

Research

The nuclear fission display at the Deutsches Museum in Munich. This was touted for many years as the table and experimental apparatus with which Otto Hahn discovered nuclear fission in 1938. The table and instruments are representative of the ones used, but not necessarily the originals, and would not have been together on the one table in the same room. Pressure from historians, scientists and feminists caused the museum to alter the display in 1988 to acknowledge Lise Meitner, Otto Frisch and Fritz Strassmann.[64]

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 potassium perrhenate, platinum chloride and sodium hydroxide. What remained was then acidified with hydrogen sulphide, 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 mercury and above on the periodic table.[65] 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.[66][67]

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.[68]

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 Zeitschift für Physik with Meiner as the principal author, and one in Chemische Berichte with Hahn as the principal author.[68][69][70] 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."[70]) Meitner was increasingly uncertain. They had now constructed three (n, γ) reactions:

  1. 238
    92
    U
    + n → 239
    92
    U
    (10 seconds) → 239
    93
    ekaRe
    (2.2 minutes) → 239
    94
    ekaOs
    (59 minutes) → 239
    95
    ekaIr
    (66 hours) → 239
    96
    ekaPt
    (2.5 hours) → 239
    97
    ekAu
    (?)
  2. 238
    92
    U
    + n → 239
    92
    U
    (40 seconds) → 239
    93
    ekaRe
    (16 minutes) → 239
    94
    ekaOs
    (5.7 hours) → 239
    95
    ekaIr
    (?)
  3. 238
    92
    U
    + n → 239
    92
    U
    (23 minutes) → 239
    93
    ekaRe

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 neutron cross section. it was too large to be anything other than the most abundant isotope, uranium-238. She concluded that it must be a case of nuclear isomerism. This had been discovered by Hahn in protactinium in 1922, and provided a physical explanation by von Weizsäcker, who had been her assistant in 1936, but had since taken a position at the Kaiser Wilhelm Institute for Physics. Different 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.[71] 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."[69][72]

Exhibition to mark the 75th anniversary of the discovery of nuclear fission, at the Vienna International Centre in 2013. The table (on loan from the Deutsches Museum Munich) is now described as a replica and images of Meitner and Strassmann are prominently displayed.

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".[73] However, thorium was not easier to work with than uranium. For a start, it had a decay product, radiothorium (228
90
Th
) that overwhelmed weaker neutron-induced activity. But Hahn and Meitner had a sample from which they had regularly removed its mother isotope, mesothorium (228
88
Ra
), 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 decays 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 had energy less than 2.5 MeV; when they had less, an (n, γ) reaction that formed 233
90
Th
was favoured.[74]

In Paris, Irene Curie and Pavel Savitch had also set out to replicate Fermi's findings. In collaboration with Hans von Halban 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.[36][30][75] 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, and, satisfied that the Paris group was mistaken. Instead, Meitner wrote to Curie with their results, and suggested a quiet retraction.[76] 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 lanthanum (which in fact it was), which they attempted unsuccessfully to isolate it with a fractional crystallisation process. (It is possible that their precipitate was contaminated with yttrium, which is also chemically similar.) By using Geiger counters and skipping the chemical precipitation, Curie and Savitch detected the 3.5-hour half-life in irradiated uranium.[77]

With the Anschluss, Germany's unification with Austria on 12 March 1938, Meitner lost her Austrian citizenship.[78] James Franck offered to sponsor her immigration to the United States, and Niels 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.[79] On 13 July 1938, Meitner departed for the Netherlands with Dutch physicists Dirk Coster. Before she left, Otto Hahn gave her a diamond ring he had inherited from his mother. She reached safety, though without her possessions, and only summer clothes. Meitner later said that she left Germany forever with 10 marks in her purse. With the help of Coster and Adriaan Fokker, she flew to Copenhagen, where she was greeted by Frisch, and stayed with Niels and Margrethe Bohr at their holiday house in Tisvilde. On 1 August she took the train to Stockholm, where she was met by Eva von Bahr.[80]

Eureka

The Paris group published their results in September 1938.[77] Hahn dismissed it as contamination, but after looking at the details of the experiments and the decay curves of the 3.5-hour substance, Strassmann was worried, and he decided to repeat the experiment, using his more efficient method of separating radium. This time, they found radium, which Hahn suggested resulted from two alpha decays:

238
92
U
+ n → α + 235
90
Th
→ α + 235
88
Ra

Meitner found this very hard to believe.[81][82]

The mechanism of fission. A neutron caused the nucleus to wobble, elongate, and split

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.[83] Assisted by Clara Lieber and Irmgard Bohne, they isolated the three radium isotopes (verified by their half-lives) and used fractional crystallisation to separate it from its barium carrier by adding barium bromide 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. 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.[84] Hahn concluded 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."[85]

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 Kungälv, 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.[86][87] 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.'"[88]

According to Frisch:

Was it a mistake? No, said Lise Meitner; Hahn was too good a chemist for that. But how could barium be formed from uranium? No larger fragments than protons or helium nuclei (alpha particles) had ever been chipped away from nuclei, and to chip off a large number not nearly enough energy was available. Nor was it possible that the uranium nucleus could have been cleaved right across. A nucleus was not like a brittle solid that can be cleaved or broken; George Gamow had suggested early on, and Bohr had given good arguments that a nucleus was much more like a liquid drop. Perhaps a drop could divide itself into two smaller drops in a more gradual manner, by first becoming elongated, then constricted, and finally being torn rather than broken in two? We knew that there were strong forces that would resist such a process, just as the surface tension of an ordinary liquid drop tends to resist its division into two smaller ones. But nuclei differed from ordinary drops in one important way: they were electrically charged, and that was known to counteract the surface tension.

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.

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 Einstein's formula E= mc2, and one-fifth of a proton mass was just equivalent to 200 MeV. So here was the source for that energy; it all fitted![89]

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.[90] On returning to Copenhagen, Frisch informed Bohr, who slapped his forehead and exclaimed "What idiots we have been!"[91] 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 krypton,[92] although Hahn mistakenly believed that the atomic masses had to add up to 239 rather than the atomic numbers adding up to 92, and thought it was masurium (technetium).[93]

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 February, and found the pulses caused by the reaction just as they had predicted.[92] He decided he needed a name for the newly discovered nuclear process. He spoke to William A. Arnold, and 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 fission. Frisch then applied that name to the nuclear process in his paper.[94] Frisch mailed both papers to Nature on 16 January; the jointly-authored note appeared in print on 11 February and Frisch's paper on recoil on 18 February.[95][96]

Reception

Bohr brings the news to the United States

Before departing for the United States on 7 January 1939 with his son Erik to attend the Fifth Washington Conference on Theoretical Physics at Princeton University, Bohr promised Frisch that he would not mention fission until the papers appeared in print, but during the Atlantic crossing on the SS Drottningholm, Bohr discussed the mechanism of fission with Leon Rosenfeld, and failed to inform him that the information was confidential. On arrival in New York City on 16 January, they were met by Fermi and his wife Laura Capon, and by John Wheeler, who had been a fellow at Bohr's institute in 1934–1935. As it happened, there was a meeting of Princeton's Physics Journal Club that evening, and when Wheeler asked Rosenfeld if he had any news to report, Rosenfeld told them.[97] An embarrassed Bohr fired off a note to Nature defending Meitner and Frisch's claim.[98] Hahn was annoyed that while Bohr mentioned his and Strassmann's work in the note, he cited only Meitner and Frisch.[99]

News spread quickly of the new discovery, which was correctly seen as an entirely novel physical effect with great scientific—and potentially practical—possibilities. Isidor Isaac Rabi and Willis Lamb, two Columbia University physicists working at Princeton, heard the news and carried it back to Columbia. Rabi said he told Enrico Fermi; Fermi gave credit to Lamb. For Fermi, the news came as a profound embarrassment, as the transuranic elements that he had partly been awarded the Nobel Prize for discovering had not been transuranic elements at all, but fission products. 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 Herbert L. Anderson. Bohr grabbed him by the shoulder and said: "Young man, let me explain to you about something new and exciting in physics."[100]

Further research

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,[101] which was done in the basement of Pupin Hall. The experiment involved placing uranium oxide inside of an ionization chamber and irradiating it with neutrons, and measuring the energy thus released. The next day, the Fifth Washington Conference on Theoretical Physics began in Washington, D.C. under the joint auspices of the George Washington University and the Carnegie Institution of Washington. From there, the news on nuclear fission spread even further, which fostered many more experimental demonstrations.[102]

Bohr and Wheeler overhauled the liquid drop model to explain the mechanism of nuclear fission, with conspicuous success.[103] Their paper appeared in Physical Review on 1 September 1939, the day Germany invaded Poland, starting World War II in Europe.[104] As the experimental physicists studied fission, they uncovered more puzzling results. George Placzek (who had measured the slow neutron absorption of gold in 1934 using Bohr's Nobel Prize medal[97]) 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 uranium-238 isotope.[105] This was based on Meitner's 1937 measurements of the neutron capture cross-sections.[106] This would be experimentally verified in February 1940, after Alfred Nier was able to produce sufficient pure uranium-235 for John R. Dunning, Astride von Grosse and Eugene T. Booth to test. [98]

Other scientists resumed the search for the elusive element 93, which seemed to be straight forward, as they now knew it resulted from the 23-minute half-life. At the Radiation Laboratory in Berkeley, California, Emilio Segrè and Edwin McMillan used the cyclotron there to create the isotope. They then detected a beta activity with a 2-day half life, but it had rare-earth element 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 Philip Abelson determined that the 2-day half life element was that of the elusive element 93, which they named "neptunium". The paved the way for the discovery by Glenn Seaborg, Emilio Segrè and Joseph W. Kennedy element 94, which they named "plutonium" in 1941. [107][108]

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.[20] French scientists Hans von Halban, Frédéric Joliot-Curie and Lew Kowarski demonstrated that uranium bombarded by neutrons emitted more neutrons than it absorbed, suggesting the possibility of a nuclear chain reaction.[109] Fermi and Anderson did so too a few weeks later.[110][111] It was apparent to many scientists that, in theory at least, an extremely powerful energy source could be created, although most still considered an atomic bomb an impossibility.[112]

Nobel prize

German stamp honouring Otto Hahn and his discovery of nuclear fission (1979)

Both Hahn and Meitner had been nominated for the chemistry and the physics Nobel prizes many times even before the discovery of nuclear fission. Several more followed for the discovery of fission.[113][114] The 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 Nobel Committee for Chemistry evaluated the nominations.[115]

The committee received reports from Theodor Svedberg and Arne Westgren. 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. The committee therefore recommended that Hahn alone be given the chemistry prize.[115] However, Germans had been forbidden to accept Nobel prizes after the Nobel Peace Prize had been awarded to Carl von Ossietzky in 1936.[116] The Nobel Committee for Chemistry's recommendation was rejected by the Royal Swedish Academy of Sciences, which decided to defer the award for one year.[115]

The war was over when the Academy reconsidered the award in September 1945. The chemistry committee had now become more cautious, as it was apparent that much research had taken place in the United States in secret, and suggested deferring for another year, but the Academy was swayed by Göran Liljestrand, who argued that it was important for the Academy to assert its independence from the Allies of World War II, and award the prize to a German,[117] as it had done after World War I when it had awarded it to Fritz Haber. Hahn therefore became the sole recipient of the 1944 Nobel Prize for Chemistry "for his discovery of the fission of heavy nuclei".[118]

Meitner write in a letter to her friend Birgit Broomé-Aminoff on 20 November 1945:

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.[119]

In 1946, the Nobel Committee for Physics considered nominations for Meitner and Frisch received from Max von Laue, Niels Bohr, Oskar Klein, Egil Hylleraas and James Franck. Reports were written for the committee by Erik Hulthén, who held the chair of experimental physics at Stockholm University, 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, Manne Siegbahn, disliked Meitner, and had a professional rivalry with Klein.[115][120] Meitner and Frisch would continue to be nominated regularly for many years, but would never be awarded the prize.[114][115][121]

In history and memory

At the end of the war in Europe, Hahn was taken into custody and incarcerated at Farm Hall with nine other senior scientists, all of whom except Max von Laue had been involved with the German nuclear weapons program, and all except Hahn and Paul Harteck were physicists. It was here that the heard the news of the atomic bombings of Hiroshima and Nagasaki. Unwilling to accept that they were years behind the Americans, and unaware that their conversations were being recorded, they concocted a story that they had never wanted their nuclear weapons program to succeed in the first place on moral grounds. 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.[122][123] Inconvenient details like the thousands of female slave labourers from Sachsenhausen concentration camp who mined uranium ore for their experiments were swept under the rug.[124]

Lise Meitner in 1946 with physicist Arthur H. Compton and actress Katherine Cornell

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.[122][123] Hahn's message resonated strongly in Germany, where he was revered as the proverbial good German, 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 Max Planck Society 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.[64]

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 puppet state of Germany and the destruction of Hiroshima and Nagasaki as poetic justice for the persecution of the Jewish people.[125][126] In January 1946, Meitner toured the United States, where she gave lectures and received honorary degrees. She attended a cocktail party for Lieutenant General Leslie Groves, the director of the Manhattan Project (who gave her sole credit for the discovery of fission in his 1962 memoirs), and was named Woman of the Year by the Women's National Press Club. At the reception for this award, she sat next to the President of the United States, Harry S. Truman. 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 Wellesley College.[127][128]

In 1966, the United States Atomic Energy Commission jointly awarded the Enrico Fermi Prize to Hahn, Strassmann and Meitner for their discovery of fission. The ceremony was held in the Hofburg palace in Vienna.[129] It was the first time that this prize had been awarded to non-Americans, and the first time it was presented to a woman.[130] Hahn and Strassmann were present, but Meitner was too ill to attend, so Frisch accepted the award on her behalf.[131]

During 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 feminists saw Meitner as yet another example of the Matilda effect, 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.[64]

Notes

  1. "The Nobel Prize in Physics 1938". Nobel Media AB. Retrieved 1 June 2020.
  2. Yruma 2008, pp. 29–31.
  3. Rhodes 1986, pp. 41–42.
  4. Badash, Lawrence (9 June 1978). "Radium, Radioactivity, and the Popularity of Scientific Discovery". Proceedings of the American Philosophical Society. 122 (3): 145–154. ISSN 0003-049X. JSTOR 986549.
  5. "Marie Curie - Research Breakthroughs (1897–1904): X-rays and Uranium Rays". American Institute of Physics. Retrieved 28 May 2020.
  6. "Marie Curie - Research Breakthroughs (1897–1904): The Discovery of Polonium and Radium". American Institute of Physics. Retrieved 28 May 2020.
  7. Rutherford, Ernest (1899). "VIII. Uranium radiation and the electrical conduction produced by it". The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, Series 5. 47 (284): 109–163. doi:10.1080/14786449908621245. ISSN 1478-6435.
  8. Rhodes 1986, pp. 42–43.
  9. Rutherford, E.; Royds, T. "XXI. The nature of the α particle from radioactive substances". The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. 98 (17): 281–286. doi:10.1080/14786440208636599. ISSN 1478-6435.
  10. Rutherford, E.; Soddy, F. (1903). "LX. Radioactive Change". The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. 5 (29): 576–591. doi:10.1080/14786440309462960.
  11. Soddy, F. (4 December 1913). "Intra-atomic Charge". Nature. 92 (2301): 399–400. doi:10.1038/092399c0. ISSN 0028-0836.
  12. Nagel, M.C (1982). "Frederick Soddy: From Alchemy to Isotopes". Journal of Chemical Education. 59: 739–740. doi:10.1021/ed059p739. ISSN 0021-9584.
  13. E. Rutherford (1911). "The scattering of α and β particles by matter and the structure of the atom" (PDF). Philosophical Magazine. 21 (4): 669–688. Bibcode:2012PMag...92..379R. doi:10.1080/14786435.2011.617037.
  14. Bohr, Niels (1913). "On the Constitution of Atoms and Molecules, Part I" (PDF). Philosophical Magazine. 26 (151): 1–24. Bibcode:1913PMag...26....1B. doi:10.1080/14786441308634955.
  15. Bohr, Niels (1913). "On the Constitution of Atoms and Molecules, Part II Systems Containing Only a Single Nucleus" (PDF). Philosophical Magazine. 26 (153): 476–502. Bibcode:1913PMag...26..476B. doi:10.1080/14786441308634993.
  16. Bohr, Niels (1913). "On the Constitution of Atoms and Molecules, Part III Systems containing several nuclei". Philosophical Magazine. 26 (155): 857–875. Bibcode:1913PMag...26..857B. doi:10.1080/14786441308635031.
  17. Sime, Ruth Lewin (August 1986). "The Discovery of Protactinium". Journal of Chemical Education. 63 (8): 653–657. doi:10.1021/ed063p653. ISSN 0021-9584.
  18. Fajans, Kasimir (January–March 1913). "Radioactive transformations and the periodic system of the elements". Berichte der Deutschen Chemischen Gesellschaft (in German). 46 (1): 422–439. doi:10.1002/cber.19130460162. ISSN 0365-9496.
  19. Soddy, Frederick (1913). "The Radio-Elements and the Periodic Law". Chemical News. 107: 97–99.
  20. Yruma 2008, pp. 39–42.
  21. Meitner, Lise (1 June 1918), Die Muttersubstanz des Actiniums, Ein Neues Radioaktives Element von Langer Lebensdauer, 24, pp. 169–173, doi:10.1002/bbpc.19180241107
  22. Blackett, Patrick Maynard Stewart (2 February 1925). "The Ejection of Protons From Nitrogen Nuclei, Photographed by the Wilson Method". Proceedings of the Royal Society A - Mathematical, Physical and Engineering Sciences. 107 (742): 349–360. doi:10.1098/rspa.1925.0029.
  23. Cockcroft, J. D.; Walton, E. T. S. (1 June 1932). "Experiments with High Velocity Positive Ions. (I) Further Developments in the Method of Obtaining High Velocity Positive Ions". Proceedings of the Royal Society of London A: Mathematical, Physical and Engineering Sciences. 136 (830): 619–630. Bibcode:1932RSPSA.136..619C. doi:10.1098/rspa.1932.0107. ISSN 1364-5021.
  24. Cockcroft, J. D.; Walton, E. T. S. (1 July 1932). "Experiments with High Velocity Positive Ions. (II) The Disintegration of Elements by High Velocity Protons". Proceedings of the Royal Society of London A: Mathematical, Physical and Engineering Sciences. 137 (831): 229–242. Bibcode:1932RSPSA.137..229C. doi:10.1098/rspa.1932.0133. ISSN 1364-5021.
  25. Rhodes 1986, pp. 39, 160–167, 793.
  26. Chadwick announced his initial findings in: J. Chadwick (1932). "Possible Existence of a Neutron" (PDF). Nature. 129 (3252): 312. Bibcode:1932Natur.129Q.312C. doi:10.1038/129312a0. ISSN 0028-0836. Subsequently he communicated his findings in more detail in: Chadwick, J. (1932). "The existence of a neutron". Proceedings of the Royal Society A. 136 (830): 692–708. Bibcode:1932RSPSA.136..692C. doi:10.1098/rspa.1932.0112.; and Chadwick, J. (1933). "The Bakerian Lecture: The Neutron". Proceedings of the Royal Society A. 142 (846): 1–25. Bibcode:1933RSPSA.142....1C. doi:10.1098/rspa.1933.0152.
  27. Rhodes 1986, pp. 200–201.
  28. Sime 1996, pp. 161–162.
  29. Curie, Irene; Joliot, Frédéric (15 January 1934). "Un nouveau type de radioactivité". Comptes rendus des séances de l'Académie des Sciences (in French). 198 (3): 254–256.
  30. Fergusson, Jack E. (July 2011). "The History of the Discovery of Nuclear Fission". Foundations of Chemistry. 13 (2): 145–166. doi:10.1007/s10698-011-9112-2. ISSN 1386-4238.
  31. Rhodes 1986, pp. 210–211.
  32. Sime 1996, pp. 162–163.
  33. Guerra, Francesco; Robotti, Nadia (December 2009). "Enrico Fermi's Discovery of Neutron-Induced Artificial Radioactivity: The Influence of His Theory of Beta Decay". Physics in Perspective. 11 (4): 379–404. Bibcode:2009PhP....11..379G. doi:10.1007/s00016-008-0415-1.
  34. Fermi, E.; Amaldi, E.; D'Agostino, O.; Rasetti, F.; Segrè, E. (1934). "Artificial Radioactivity Produced by Neutron Bombardment". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences. 146 (857): 483. Bibcode:1934RSPSA.146..483F. doi:10.1098/rspa.1934.0168.
  35. Frisch 1979, pp. 88–89.
  36. Segrè, Emilio G. (July 1989). "Discovery of Nuclear Fission". Physics Today. 42 (7): 38–43. doi:10.1063/1.881174.
  37. Sime 1996, p. 164.
  38. Fermi, E. (6 June 1934). "Possible Production of Elements of Atomic Number Higher than 92". Nature (133): 898–899. doi:10.1038/133898a0. ISSN 0028-0836.
  39. Yruma 2008, pp. 46–47.
  40. Amaldi 2001, pp. 153–156.
  41. Sime 1996, p. 166.
  42. Meitner, L. (November 1934). "Über die Umwandlung der Elemente durch Neutronen". Naturwissenschaften (in German). 22 (45): 759. doi:10.1007/BF01498223. ISSN 0028-1042.
  43. Rhodes 1986, pp. 217–219.
  44. Gamow, George (1930). "Mass Defect Curve and Nuclear Constitution". Proceedings of the Royal Society A. 126 (803): 632–644. Bibcode:1930RSPSA.126..632G. doi:10.1098/rspa.1930.0032. JSTOR 95297.
  45. Choksi, Rustum; Muratov, Cyrill; Topaloglu, Ihsan (December 2017). "An Old Problem Resurfaces Nonlocally: Gamow's Liquid Drops Inspire Today's Research and Applications". Notices of the American Mathematical Society. 64: 1275–1283. doi:10.1090/noti1598.
  46. von Weizsäcker, C. F. (1935). "Zur Theorie der Kernmassen". Zeitschrift für Physik (in German). 96 (7–8): 431–458. Bibcode:1935ZPhy...96..431W. doi:10.1007/BF01337700.
  47. Bohr, N. (29 February 1936). "Neutron Capture and Nuclear Constitution". Nature. 137: 344–348. doi:10.1038/137344a0. ISSN 0028-0836.
  48. Pearson, Michael (June 2015). "On the belated discovery of fission". Physics Today. 68 (6): 40–46. doi:10.1063/PT.3.2817.
  49. Noddack, Ida (15 September 1934). Translated by Graetzer, H. G. "Über das Element 93". Zeitschrift fur Angewandte Chemie. 47 (37): 653–655. doi:10.1002/ange.19340473707. ISSN 1433-7851. Retrieved 2 June 2020.
  50. Hook 2002, pp. 139–141.
  51. Libby 1979, p. 43.
  52. Hook 2002, pp. 130–132.
  53. Sime, Ruth Lewin (May 1989). "Lise Meitner and the Discovery of Fission". Journal of Chemical Education. 66 (5). doi:10.1021/ed066p373. ISSN 0021-9584.
  54. Sime 1996, p. 368.
  55. "Ehrung der Physikerin Lise Meitner Aus dem Otto-Hahn-Bau wird der Hahn-Meitner-Bau" [Honouring physicist Lise Meitner as the Otto Hahn building becomes the Hahn-Meitner building] (in German). Free University of Berlin. 28 October 2010. Retrieved 10 June 2020.
  56. v. Grosse, A.; Agruss, M. (1 August 1934). "The Chemistry of Element 93 and Fermi's Discovery". Physical Review. 46 (3): 241. doi:10.1103/PhysRev.46.241. ISSN 0031-899X.
  57. v. Grosse, A.; Agruss, M. (1 March 1935). "The Identity of Fermi's Reactions of Element 93 with Element 91". Journal of the American Chemical Society. 57: 438–439. doi:10.1021/ja01306a015. ISSN 0002-7863.
  58. Sime 1996, pp. 164–165.
  59. Hahn 1966, pp. 140–141.
  60. Friedlander, Gerhart; Herrmann, Günter (April 1981). "Fritz Strassmann". Physics Today. 34 (4): 84–86. doi:10.1063/1.2914536. ISSN 0031-9228.
  61. Sime 1996, pp. 156–157, 169.
  62. Sime 1996, pp. 138–139.
  63. Sime 1996, p. 150.
  64. Sime, Ruth Lewin (15 June 2010). "An Inconvenient History: the Nuclear-Fission Display in the Deutsches Museum". Physics in Perspective. 12: 190–218. ISSN 1422-6944.
  65. Sime 1996, p. 167.
  66. Sime 1996, p. 169.
  67. O., Hahn; L., Meitner (11 January 1935). "Uber die kunstliche Umwandlung des Urans durch Neutronen" [Concerning the induced transmutations of uranium by neutrons]. Naturwissenschaften (in German). 23 (2): 37–38. doi:10.1007/BF01495005. ISSN 0028-1042.
  68. Sime 1996, pp. 170–172.
  69. L., Meitner; O., Hahn; Strassmann, F. (May 1937). "Über die Umwandlungsreihen des Urans, die durch Neutronenbestrahlung erzeugt werden" [On the series of transformations of uranium that are generated by neutron radiation]. Zeitschift für Physik (in German). 106 (3–4): 249–270. doi:10.1007/BF01340321. ISSN 0939-7922.
  70. O., Hahn; L., Meitner; Strassmann, F. (9 June 1937). "Über die Trans‐Urane und ihr chemisches Verhalten" [On the transuranes and their chemical behaviour]. Berichte der deutschen chemischen Gesellschaft. 70 (6): 1374–1392. doi:10.1002/cber.19370700634. ISSN 0365-9496.
  71. Sime 1996, pp. 174–177.
  72. Sime 1996, p. 177.
  73. Sime 1996, p. 179.
  74. Sime 1996, pp. 180–181.
  75. Curie, Irene; Savitch, P. (October 1937). "Sur les radioéléments formés dans l'uranium irradié par les neutrons". Journal de Physique et Le Radium (in French). 8 (10): 385–387. doi:10.1051/jphysrad:01937008010038500.
  76. Sime 1996, pp. 182–183.
  77. Curie, Irene; Savitch, P. (September 1938). "Sur les radioéléments formés dans l'uranium irradié par les neutrons. II". Journal de Physique et Le Radium. 9 (9): 355–359. doi:10.1051/jphysrad:0193800909035500.
  78. Sime 1996, pp. 184–185.
  79. Sime 1996, pp. 189–190.
  80. Sime 1996, pp. 200–207.
  81. Sime 1996, pp. 221–224.
  82. O., Hahn; Strassmann, F. (18 November 1938). "Ober die Entstehung yon Radiumisotopen aus Uran durch Bestrahlen mit schn-ellen und verlangsamten Neutronen" [Concerning the creation in radium isotopes from uranium by irradiation with fast and slow neutrons]. Naturwissenschaften (in German). 26 (46): 755–756. doi:10.1007/BF01774197. ISSN 0028-1042.
  83. Sime 1996, pp. 227–230.
  84. Sime 1996, pp. 233–234.
  85. O., Hahn; Strassmann, F. (6 January 1939). "Über den Nachweis und das Verhalten der bei der Bestrahlung des Urans mittels Neutronen entstehenden Erdalkalimetalle" [Concerning the existence of alkaline earth metals resulting from neutron irradiation of uranium]. Naturwissenschaften (in German). 27 (1): 11–15. doi:10.1007/BF01488241. ISSN 0028-1042.
  86. Frisch 1979, pp. 113–114.
  87. Sime 1996, pp. 235–239.
  88. Sime 1996, p. 235.
  89. Frisch 1979, pp. 115–116.
  90. Sime 1996, p. 243.
  91. Frisch 1979, p. 116.
  92. Sime 1996, p. 246.
  93. Sime 1996, pp. 239, 456.
  94. Rhodes 1986, p. 263.
  95. Meitner, L.; Frisch, O. R. (1939). "Disintegration of Uranium by Neutrons: a New Type of Nuclear Reaction". Nature. 143 (3615): 239. Bibcode:1939Natur.143..239M. doi:10.1038/143239a0. ISSN 0028-0836.
  96. Frisch, O. R. (1939). "Physical Evidence for the Division of Heavy Nuclei under Neutron Bombardment". Nature. 143 (3616): 276. Bibcode:1939Natur.143..276F. doi:10.1038/143276a0. ISSN 0028-0836. Archived from the original on 23 January 2009.
  97. Stuewer, Roger H. (October 1985). "Bringing the News of Fission to America". Physics Today. 38 (10): 48–56. doi:10.1063/1.881016. ISSN 0031-9228.
  98. Sime 1996, pp. 260–261.
  99. Sime 1996, p. 263.
  100. Rhodes 1986, pp. 267–268.
  101. H. L. Anderson; E. T. Booth; J. R. Dunning; E. Fermi; G. N. Glasoe & F. G. Slack (1939). "The Fission of Uranium". Physical Review. 55 (5): 511. Bibcode:1939PhRv...55..511A. doi:10.1103/PhysRev.55.511.2. ISSN 0031-899X.
  102. Rhodes 1986, pp. 267–270.
  103. Bohr, Niels; Wheeler, John Archibald (September 1939). "The Mechanism of Nuclear Fission". Physical Review. 56 (5): 426–450. Bibcode:1939PhRv...56..426B. doi:10.1103/PhysRev.56.426. ISSN 0031-899X.
  104. Wheeler & Ford 1998, p. 31.
  105. Wheeler & Ford 1998, pp. 27–28.
  106. Sime 1996, p. 258.
  107. Sime, R. (March 2000). "The Search for Transuranium Elements and the Discovery of Nuclear Fission". Physics in Perspective. 2 (1): 48–62. doi:10.1007/s000160050036. ISSN 1422-6944.
  108. Rhodes 1986, pp. 353–355.
  109. Von Halban, H.; Joliot, F.; Kowarski, L. (22 April 1939). "Number of Neutrons Liberated in the Nuclear Fission of Uranium". Nature. 143 (3625): 680. Bibcode:1939Natur.143..680V. doi:10.1038/143680a0. ISSN 0028-0836.
  110. Anderson, H.; Fermi, E.; Hanstein, H. (16 March 1939). "Production of Neutrons in Uranium Bombarded by Neutrons". Physical Review. 55 (8): 797–798. Bibcode:1939PhRv...55..797A. doi:10.1103/PhysRev.55.797.2. ISSN 0031-899X.
  111. Anderson, H.L. (April 1973). "Early Days of Chain Reaction". Bulletin of the Atomic Scientists. 29 (4): 8–12. Bibcode:1973BuAtS..29d...8A. doi:10.1080/00963402.1973.11455466. ISSN 1938-3282.
  112. Clark 1961, pp. 25–29.
  113. "Nomination Database: Otto Hahn". Nobel Media AB. 9 June 2020.
  114. "Nomination Database: Lise Meitner". Nobel Media AB. 9 June 2020.
  115. Crawford, Elisabeth; Sime, Ruth Lewin; Walker, Mark (1997). "A Nobel Tale of Postwar Injustice". Physics Today. 50 (9): 26–32. Bibcode:1997PhT....50i..26C. doi:10.1063/1.881933. ISSN 0031-9228.
  116. Sime 1996, pp. 158, 232.
  117. Yruma 2008, p. 138.
  118. "The Nobel Prize in Chemistry 1944". Nobel Foundation. Retrieved 6 October 2008.
  119. Sime 1996, pp. 326–327.
  120. Yruma 2008, p. 73.
  121. "Nomination Database: Otto Robert Frisch". Nobel Media AB. 9 June 2020.
  122. Sime, Ruth Lewin (March 2006). "The Politics of Memory: Otto Hahn and the Third Reich". Physics in Perspective. 8 (1): 3–51. doi:10.1007/s00016-004-0248-5. ISSN 1422-6944.
  123. Yruma 2008, pp. 132–137.
  124. Bernstein 2001, p. 122.
  125. Yruma 2008, pp. 150–154, 160.
  126. Hill 2003, pp. 120–123.
  127. Groves 1962, p. 5.
  128. Yruma 2008, pp. 161–164.
  129. "Europeans Receive Fermi Prize For Nuclear Fission Research". 24 September 1966. Retrieved 10 June 2020.
  130. Hahn 1966, p. 183.
  131. Sime 1996, pp. 379–380.

References

Further reading

  • Graetzer, Hans D.; Anderson, David L. (1971). The Discovery of Nuclear Fission: A Documentary History. New York: Van Nostrand-Reinhold. OCLC 1130319295.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.