Otto Hahn: Wikis


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Otto Hahn

Born 8 March 1879(1879-03-08)
Frankfurt am Main, Germany
Died 28 July 1968 (aged 89)
Göttingen, Germany
Nationality Germany
Fields Radiochemistry, nuclear chemistry
Alma mater University of Marburg
Doctoral advisor Theodor Zincke
Known for Discovery of radioactive elements
Nuclear isomerism
Nuclear fission
Notable awards Nobel Prize in Chemistry (1944)
Faraday Medal (1956)
Enrico Fermi Award (1966)

Otto Hahn (8 March 1879 – 28 July 1968) was a German chemist and Nobel laureate who pioneered the fields of radioactivity and radiochemistry, who became a chief critic of Allied injustice in Germany following World War Two. He is regarded as "the father of nuclear chemistry" and the "founder of the atomic age".




Early life

Hahn was the youngest son of Heinrich Hahn (1845–1922), a prosperous glazier and entrepreneur ("Glasbau Hahn"), and Charlotte Hahn, née Giese (1845–1905). Together with his brothers Karl, Heiner and Julius, Otto was raised in a sheltered environment. At the age of 15, he began to take a special interest in chemistry and carried out simple experiments in the laundry room of the family home. His father wanted Otto to study architecture, as he had built or acquired several residential and business properties. But Otto persuaded him that his ambition was to become an industrial chemist.

In 1897, after taking his Abitur at the Klinger Oberrealschule in Frankfurt, Hahn began to study chemistry and mineralogy at the University of Marburg. His subsidiary subjects were physics and philosophy. Hahn joined the Students' Association of Natural Sciences and Medicine, a student fraternity and a forerunner of today's Nibelungia Fraternity. He spent his third and fourth semester studying under Adolf von Baeyer at the University of Munich. In 1901, Hahn received his doctorate in Marburg for a dissertation entitled On Bromine Derivates of Isoeugenol, a topic in classical organic chemistry. After completing his one year military service, the young chemist returned to the University of Marburg, where for two years he worked as assistant to his doctoral supervisor, Geheimrat Professor Theodor Zincke.


Early research

Hahn's intention had been to work in industry. With this in mind, and also to improve his knowledge of English, he took up a post at University College London in 1904, working under Sir William Ramsay, known for having discovered the inert gases. Here Hahn worked on radiochemistry, at that time a very new field. In 1905, in the course of his work with salts of radium, Hahn discovered a substance he called radiothorium (thorium 228), which at that time was believed to be a new radioactive element. (In fact, it was a still undiscovered isotope of the known element thorium. The terms "isotopy" and "isotope" were only coined in 1913, by the British chemist Frederick Soddy). In the months between late 1905 and early 1906, Hahn visited Montreal, Canada, where he investigated alpha-rays of radiothorium and radioactinium with Ernest Rutherford who was teaching at McGill University at the time.

In 1906, Hahn returned to Germany, where he collaborated with Emil Fischer at the University of Berlin. Fischer placed at his disposal a former woodworking shop ("Holzwerkstatt") in the Chemical Institute to use as his own laboratory. There, in the space of a few months, using extremely primitive apparatus, Hahn discovered mesothorium I, mesothorium II and - independently from Bertram Boltwood - the mother substance of radium, ionium. In subsequent years, mesothorium I (radium-228) assumed great importance because, like radium-226 (discovered by Pierre and Marie Curie), it was ideally suited for use in medical radiation treatment, while costing only half as much to manufacture. (In 1944, for the discovery of mesothorium I, Otto Hahn was first nominated for the Nobel Prize in Chemistry by Adolf von Baeyer). In June 1907, by means of the traditional habilitation thesis, Hahn qualified to teach at the University of Berlin. On 28 September 1907 he made the acquaintance of the young Austrian physicist Lise Meitner, who had transferred from Vienna to Berlin. So began the thirty-year collaboration and lifelong close friendship between the two scientists.

After the physicist Harriet Brooks had observed a radioactive recoil in 1904, but interpreted it wrongly, Otto Hahn succeeded, in the winter of 1908/09, in demonstrating the radioactive recoil incident to alpha particle emission and interpreting it correctly. "...a profoundly significant discovery in physics with far-reaching consequences", as the physicist Walther Gerlach put it.

In 1910 Hahn was appointed professor, and in 1912 he became head of the Radioactivity Department of the newly founded Kaiser Wilhelm Institute for Chemistry in Berlin-Dahlem (since 1956 "Otto Hahn Building of the Free University", Berlin, Thielallee 63). Succeeding Alfred Stock, Hahn was director of the institute from 1928 to 1946. As early as 1924, Hahn was elected to full membership of the Prussian Academy of Sciences in Berlin (proposed by Einstein, Planck, Fritz Haber, Schlenk and von Laue).

In June 1911, while attending a conference in Stettin (today Szczecin, Poland) Otto Hahn met Edith Junghans (1887–1968), an art student. On 22 March 1913 the couple married in Edith's native city of Stettin, where her father, Paul Ferdinand Junghans, was a high-ranking law officer and President of the City Parliament until his 1915 death. Their only child, Hanno, born in 1922, became a distinguished art historian and architectural researcher (at the Hertziana in Rome). In 1960, while on a study trip in France, Dr Hanno Hahn was involved in a fatal car accident, together with his wife and assistant Ilse Hahn, née Pletz. They left a fourteen-year-old son, Dietrich. In 1990, the "Hanno and Ilse Hahn Prize for Outstanding Contributions to Italian Art History" was established to support talented young art historians and in memory of Hanno and Ilse Hahn. It is awarded biennally by the Bibliotheca Hertziana, Max Planck Institute for Art History, in Rome.

During the First World War, Hahn was conscripted into the army, where he was assigned, together with James Franck and Gustav Hertz, to the special unit for chemical warfare under the direction of Fritz Haber. The unit developed, tested and produced poison gas for military purposes, and was sent to both the western and eastern front lines. In December 1916, Hahn was transferred to the "Headquarters of His Majesty" in Berlin, and was able to resume his radiochemical research in his institute. In 1917/18 Hahn and Lise Meitner isolated a long-lived activity, which they named "proto-actinium". Already in 1913, Fajans and Göhring had isolated a short-lived activity from uranium X2 (later known as 234mPa) and called the substance "brevium". The two activities were different isotopes of the same undiscovered element no. 91. Finally in 1949, the International Union of Pure and Applied Chemistry (IUPAC) named this new element protactinium and confirmed Hahn and Meitner as discoverers.

In February 1921, Otto Hahn published the first report on his discovery of uranium Z (later known as 234Pa), the first example of nuclear isomerism. "...a discovery that was not understood at the time but later became highly significant for nuclear physics", as Walther Gerlach remarked. And, indeed, it was not until 1936 that the young physicist Carl Friedrich von Weizsäcker succeeded in providing a theoretical explanation of the phenomenon of nuclear isomerism. For this discovery, whose full significance was recognized by very few, Hahn was again proposed, in 1923, for the Nobel Prize in Chemistry, this time by Max Planck, among others.

In the early 1920s, Otto Hahn created a new field of work. Using the "emanation method", which he had recently developed, and the "emanation ability", he founded what became known as "Applied Radiochemistry" for the researching of general chemical and physical-chemical questions. In 1933 he published a book in English (and later in Russian) entitled "Applied Radiochemistry". It contains the lectures given by Hahn when he was a visiting professor at Cornell University in Ithaca, New York in 1933. In 1966, Glenn T. Seaborg, President of the United States Atomic Energy Commission, wrote about this book as follows:

"As a young graduate student at the University of California at Berkeley in the mid-1930s and in connection with our work with plutonium a few years later, I used his book "Applied Radiochemistry" as my bible. This book was based on a series of lectures which Professor Hahn had given at Cornell in 1933; it set forth the "laws" for the co-precipitation of minute quantities of radioactive materials when insoluble substances were precipitated from aqueous solutions. I recall reading and rereading every word in these laws of co-precipitation many times, attempting to derive every possible bit of guidance for our work, and perhaps in my zealousness reading into them more than the master himself had intended. I doubt that I have read sections in any other book more carefully or more frequently than those in Hahn's Applied Radiochemistry. In fact, I read the entire volume repeatedly and I recall that my chief disappointment with it was its length. It was too short."

Discovery of nuclear fission

Jointly with Lise Meitner and his pupil and assistant Fritz Strassmann (1902–1980), Otto Hahn furthered the research begun by Enrico Fermi and his team in 1934 when they bombarded uranium with neutrons. Until 1938, it was believed that the elements with atomic numbers greater than 92 (known as transuranium elements) arise when uranium atoms are bombarded with neutrons. The German chemist Ida Noddack proposed an exception. She anticipated the paradigm shift of 1938/39 in her article published in the journal Angewandte Chemie, Nr. 47, 1934, in which she speculated:

"It is conceivable that when heavy nuclei are bombarded with neutrons these nuclei could break down into several fairly large fragments, which are certainly isotopes of known elements, but not neighbours of the irradiated elements."

But no physicist or chemist really took Noddack's speculation seriously or tested them, not even Ida Noddack. The idea that heavy atomic nuclei could break down into lighter elements was regarded as a totally inadmissible theory and impossible to test experimentally.

On 13 July 1938, with the help and support of Hahn, Lise Meitner, who was at great risk as she was of Jewish ancestry and had lost her Austrian citizenship after the Anschluss, emigrated to Stockholm, Sweden by crossing the German-Dutch border illegally.[1]

Nuclear fission experimental setup, reconstructed at the Deutsches Museum, Munich.
Otto Hahn's notebook

Hahn continued to work with Strassmann on elucidating the outcome of bombardment of uranium with thermal neutrons. In December 1938, when Hahn and Strassmann looked for transuranium elements in a uranium sample that had been bombarded with neutrons, they found traces of barium. The barium was detected by the use of an organic barium salt constructed by Wilhelm Traube, a Jewish chemist who was later arrested and murdered despite Hahn's efforts to save him.[citation needed]

On the evidence of the decisive experiment on 17 December 1938 (the celebrated "radium-barium-mesothorium-fractionation"), Otto Hahn concluded that the uranium nucleus had "burst" into atomic nuclei of medium weight. This was the discovery of nuclear fission.

On 22 December 1938, Hahn and Fritz Strassmann sent a manuscript to Naturwissenschaften reporting their radiochemical results, which were the irrefutable proof that the uranium had been split into fragments consisting of lighter elements;[2] simultaneously, they communicated these results to Lise Meitner, who had escaped out of Germany earlier that year and was then in Sweden.[1] Meitner, and her nephew, the young physicist Otto Robert Frisch, correctly interpreted these results as being nuclear fission, a term coined by Frisch, which subsequently became internationally known.[3] Frisch confirmed this experimentally on 13 January 1939.[4]

In a later appreciation, Meitner wrote:

"The discovery of nuclear fission by Otto Hahn and Fritz Strassmann opened up a new era in human history. It seems to me that what makes the science behind this discovery so remarkable is that it was achieved by purely chemical means."[citation needed]

In an interview on German television (ARD, 8 March 1959), Meitner said:

"Hahn and Strassmann were able to do this by exceptionally good chemistry, fantastically good chemistry, which was way ahead of what anyone else was capable of at that time. The Americans learned to do it later. But at that time, Hahn and Strassmann were really the only ones who could do it. And that was because they were such good chemists. Somehow they really succeeded in using chemistry to demonstrate and prove a physical process."[citation needed]

Fritz Strassmann responded with this clarification:

"Professor Meitner stated that the success could be attributed to chemistry. I have to make a slight correction. Chemistry merely isolated the individual substances, it did not precisely identify them. It took Professor Hahn's method to do this. This is where his achievement lies."[citation needed]

(Citation sources: Lise Meitner - Recollections of Otto Hahn. Stuttgart 2005).

In their second publication on nuclear fission (Die Naturwissenschaften, 10 February 1939) Otto Hahn and Fritz Strassmann predicted the existence and liberation of additional neutrons during the fission process, which was proofed as chain reaction by Frédéric Joliot and his team in March 1939.

During the war, Otto Hahn - together with his assistants Hans-Joachim Born, Siegfried Flügge, Hans Götte, Walter Seelmann-Eggebert and Fritz Strassmann - worked on uranium fission reactions. By 1945 he had drawn up a list of 25 elements and about 100 isotopes whose existence he had demonstrated.

Thanks to his determined intervention, Hahn, who had always been an opponent of the Nazi dictatorship, was able to support numerous members of his institute whose lives were in danger or were suffering persecution, and prevent them from being sent to the front line or deported. In this, he was assisted by his courageous wife Edith, who had for years collected food for Jews hiding in Berlin. As early as 1934, Hahn resigned from the University of Berlin to protest the dismissal of Jewish colleagues, notably Lise Meitner, Fritz Haber, and James Franck.

At the end of World War II in 1945 Hahn was suspected of working on the German nuclear energy project to develop an atomic reactor or an atomic bomb. But his only connection was the discovery of fission, he did not work on the program. Hahn and nine German physicists (including Max von Laue, Werner Heisenberg and Carl Friedrich von Weizsäcker) were interned at Farm Hall, Godmanchester, near Cambridge, England from 3 July 1945 to 3 January 1946. While they were there, the German scientists learned of the dropping of the American atom bombs on Hiroshima and Nagasaki on 6 August and 9 August 1945. Hahn was on the brink of despair, as he felt that because he had discovered nuclear fission he shared responsibility for the death and suffering of hundreds of thousands of Japanese people. Early in January 1946, the group was allowed to return to Germany.

Nobel Prize

On 15 November 1945 the Royal Swedish Academy of Sciences announced that Hahn had been awarded the 1944 Nobel Prize in Chemistry "for his discovery of the fission of heavy atomic nuclei."[5][6][7] Some historians have documented the history of the discovery of nuclear fission and believe Meitner should have been awarded the Nobel Prize with Hahn.[8][9][10] Hahn was still being detained at Farm Hall when the announcement was made, thus, his whereabouts were a secret and it was impossible for the Nobel committee to send him a congratulatory telegram. Instead, he learned about his award through the Daily Telegraph newspaper.[11] His fellow interned German scientists celebrated his award on 18 November by giving speeches, making jokes, and composing songs.[12] On 4 December, Hahn was persuaded by two of his captors to write a letter to the Nobel committee accepting the prize but also stating that he would not be able to attend the award ceremony.[13] He could not participate in the Nobel festivities on 10 December since his captors would not allow him to leave Farm Hall.

"There is no doubt at all that Hahn fully deserves the Nobel Prize in Chemistry" wrote Lise Meitner to her friend Eva von Bahr-Bergius in November 1945.[citation needed] Meitner's former assistant Carl Friedrich von Weizsäcker later added: "He certainly did deserve this Nobel Prize. He would have deserved it even if he had not made this discovery. But everyone recognized that the splitting of the atomic nucleus merited a Nobel Prize."[citation needed]

(Citations source: Lise Meitner - Recollections of Otto Hahn. Stuttgart 2005)

Hahn attended the Nobel festivities the year after he was awarded the prize. On 10 December 1946, King Gustav V of Sweden finally presented him with his Nobel Prize medal and diploma.[7]

Max Planck Society

From 1948 to 1960 Otto Hahn was the founding President of the newly formed Max Planck Society for the Advancement of Science, which through his tireless activity and his worldwide respected personality succeeded in regaining the renown once enjoyed by the Kaiser Wilhelm Society. Immediately after the Second World War, Hahn reacted to the dropping of the atomic bombs on Hiroshima and Nagasaki by coming 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. Consequently, among other things, he initiated the Mainau Declaration of 1955, in which a large number of Nobel Prize-winners called attention to the dangers of atomic weapons and warned the nations of the world urgently against the use of "force as a final resort". He was also instrumental and one of the authors of the Göttingen Manifesto of 1957, in which, together with 17 leading German atomic scientists, he protested against a proposed nuclear arming of the new West German armed forces (Bundeswehr). In January 1958, Otto Hahn signed the Pauling Appeal to the United Nations for the "immediate conclusion of an international agreement to stop the testing of nuclear weapons", and in October he signed the international Agreement to call a meeting to draw up a world constitution. Right up to his death, he never tired of warning urgently of the dangers of the nuclear arms race between the great powers and of the radioactive contamination of the planet. From 1957, Hahn was repeatedly nominated for the Nobel Peace Prize by a number of organizations, including the largest French trade union, the Confederation Generale du Travail. Linus Pauling, the 1962 Nobel Peace laureate, once described Otto Hahn as "an inspiration to me."

Honours and awards

Hahn received many governmental honours and academic awards from all over the world. He was elected member or honorary member in 45 Academies and scientific societies (among them the Royal Society in London and the Academies in Allahabad (India), Bangalore (India), Boston (USA), Bucharest, Copenhagen, Helsinki, Lisbon, Madrid, Rome, Stockholm, Vienna) and received 37 of the highest national and international orders and medals (among them the Golden Paracelsus Medal from the Swiss Chemical Society and the Faraday Medal from the British Chemical Society). In 1959 President Charles de Gaulle of France made him an Officer of the Légion d'Honneur, he was made a knight of the Peace Class of the Order Pour le Mérite, received the Distinguished Service Order and the Grand Cross of the Federal Republic of Germany. In 1961 Pope John XXIII awarded him the Gold Medal of the Papal Academy. (In 1957 Hahn was elected an honorary citizen of the city of Magdeburg, German Democratic Republic, and in 1958 an honorary member of the Soviet Academy of Science in Moscow. He declined both honours).

In 1966, President Lyndon B. Johnson of the USA, and the USA Atomic Energy Commission awarded Hahn (together with Lise Meitner and Fritz Strassmann) the Enrico Fermi Prize. This was the only time the Fermi Prize has been awarded to non-Americans.

Hahn was made an honorary citizen of the cities of Frankfurt am Main and Göttingen, and of the land and the city of Berlin. The day after his death, the Max Planck Society published the following obituary notice in all the major newspapers:

"On 28 July, in his 90th year, our Honorary President Otto Hahn passed away. His name will be recorded in the history of humanity as the founder of the atomic age. In him Germany and the world have lost a scholar who was distinguished in equal measure by his integrity and personal humility. The Max Planck Society mourns its founder, who continued the tasks and traditions of the Kaiser Wilhelm Society after the war, and mourns also a good and much loved human being, who will live in the memories of all who had the chance to meet him. His work will continue. We remember him with deep gratitude and admiration."


Otto Hahn on a stamp of the German Democratic Republic, 1979

Proposals were made at different times, first in 1971 by American chemists, that the newly syntheticized element no. 105 should be named Hahnium in Hahn's honour, although in 1997 the IUPAC (International Union of Pure and Applied Chemistry) finally named it Dubnium, after the Russian research center in Dubna (see Element naming controversy). Although element 108 was given the name Hassium by its officially-recognised German discoverers in 1992, a 1994 IUPAC committee recommended that it be named Hahnium (Hn)[14], in spite of the long-standing convention to give the discoverer the right to suggest a name. This recommendation was not adopted, following protests from the German discoverers, and the name Hassium (Hs) was adopted internationally in 1997.[15]

In 1964 the only European and one of the world's three nuclear-powered civilian ships, the freighter NS Otto Hahn, was named in his honour. In 1959 there were the opening ceremonies of the "Otto Hahn Institute" in Mainz and the "Hahn Meitner Institute for Nuclear Research (HMI)" in Berlin. There are craters on Mars and the Moon, and the asteroid No. 19126 "Ottohahn" named in his honour, as well as the "Otto Hahn Prize" of both the German Chemical and Physical Societies, the "Otto Hahn Medal" of the Max Planck Society and the "Otto Hahn Peace Medal in Gold" of the United Nations Association of Germany (DGVN) in Berlin.

A great many cities and districts in the German speaking countries have named secondary schools of all types after him, and countless streets, squares and bridges throughout Europe bear his name. Several states have honoured Otto Hahn by issuing coins, medals and stamps (among them the Federal Republic of Germany, the German Democratic Republic, Austria, Romania, Angola, Cuba, the Commonwealth of Dominica, Madagascar, St. Vincent & the Grenadines, Chad, Ghana, Guinea and Bissau). An island in the Antarctic (near Mt. Discovery) was also named after him, as were two Intercity trains of the German Federal Railways in 1971, running between Hamburg and Basel SBB, and the "Otto Hahn Library" in Göttingen. In 1974, in appreciation of the special contribution of Otto Hahn to German-Israeli relations, a wing of the Weizmann Institute of Science in Rehovot, Israel, was given the name "Otto Hahn Wing". In several cities and districts busts, monuments and memorial plaques were unveiled, including Berlin (East and West), Boston (USA), Frankfurt am Main, Göttingen, Gundersheim, Mainz, Marburg, Munich (in the hall of honour in the Deutsches Museum), Rehovot (Israel), San Vigilio (Lake Garda) and Vienna (in the foyer of the International Atomic Energy Agency, IAEA). A special honour in 1997 was conferred on Hahn in the Netherlands: after an azalea already bore his name (Rhododendron luteum var Otto Hahn), Dutch rose growers named a new variety of rose "Otto Hahn".

At the end of 1999 the German newsmagazine FOCUS published an inquiry of 500 leading natural scientists, engineers and physicians about the most important scientists of the 20th century. In this poll the experimental chemist Otto Hahn - after the theoretical physicists Albert Einstein and Max Planck - was elected third (with 81 points) and thus the most significant empiric researcher of his time. (FOCUS, No. 52, 1999, p. 103-108).

Allied criticism

Hahn was a critic of the Allied occupation and denazification programmes at German universities, emphasizing the injustice brought upon German scientists and the German people following the war. In 1947 he accused the Allies of doing to Germany what they had accused Germany of doing to Poland and Russia.[16] After becoming President of the Kaiser Wilhelm Society in 1946, he justified the anti-Jewish policies of the institute following 1933. By 1947, he had dismissed Meitner's role in his work, failing to acknowledge her in accepting the Nobel Prize and subsequent interviews,[16] for which she was distraught over his renewed nationalism.[16] During these interviews he placed repeated focus on the injustices occurring in Germany in the present.[16]


  • 1936. Applied Radiochemistry. Cornell University Press, Ithaca, New York 1936. Humphrey Milford, London 1936. Oxford University Press, Oxford 1936.
  • 1950. New Atoms - Progress and some memories. Edited by W. Gaade. Elsevier Inc., New York-Amsterdam-London-Brussels.
  • 1967. A Scientific Autobiography. Introduction by Glenn T. Seaborg. Translated and edited by Willy Ley. Charles Scribner's Sons, New York. British edition: McGibbon and Kee, London 1967.
  • 1970. My Life. Preface by Sir James Chadwick. Translated by Ernst Kaiser and Eithne Wilkins. Macdonald & Co., London. American edition: Herder and Herder, New York 1970.

See also


  • Berninger, Ernst H. (1970). Otto Hahn 1879–1968. (English ed.). Bonn: Inter Nationes. 
  • Beyerchen, Alan D. (1977). Scientists under Hitler. New Haven and London: Yale University Press. 
  • Clarke, Ronald C. (1980). The Greatest Power on Earth. London: Sidgwick & Jackson. 
  • Anthony Feldman, Peter Ford, 1979: Otto Hahn - in: Scientists and Inventors. Aldus Books, London.
  • Laura Fermi, 1962. The Story of Atomic Energy. Random House, New York.
  • Hans D. Graetzer, David L. Anderson, 1971. The Discovery of Nuclear Fission. A documentary history. Van Nostrand-Reinhold, New York.
  • Alwyn McKay, 1984. The Making of the Atomic Age. Oxford University Press.
  • Klaus Hoffmann, 2001. Otto Hahn - Achievement and Responsibility. Springer, New York-Berlin-Barcelona-Hong Kong-London-Milan-Paris-Singapore-Tokyo.
  • Horst Kant, 2002. Otto Hahn and the Declarations of Mainau and Göttingen. Berlin.
  • Lise Meitner, 2005. Recollections of Otto Hahn. S. Hirzel. Stuttgart.
  • David Nachmansohn, 1979. German-Jewish Pioneers in Science 1900–1933. Highlights in Atomic Physics, Chemistry and Biochemistry. Springer Inc., New York etc.
  • R. W. Reid, 1969. Tongues of Conscience. Constable & Co., London.
  • J.A. Revill, Sir Charles Frank, eds., 1993. Operation Epsilon. The Farmhall Transcripts. IOP Publishing, Bristol-Philadelphia.
  • Richard Rhodes, 1988. The Making of the Atomic Bomb. Simon and Schuster, New York.
  • Glenn T. Seaborg, 1972. Nuclear Milestones. San Francisco.
  • William R. Shea, ed., 1983. Otto Hahn and the Rise of Nuclear Physics. Reidel, Dordrecht-Boston-Lancaster.
  • Robert Spence, 1970. Otto Hahn - Biographical Memoirs of Fellows of the Royal Society, Vol. 16, London.
  • Jim Whiting, 2004. Otto Hahn and the Discovery of Nuclear Fission. Mitchell Lane, Hockessin.


  1. ^ a b Ruth Lewin Sime Lise Meitner’s Escape from Germany, American Journal of Physics Volume 58, Number 3, 263- 267 (1990).
  2. ^ O. Hahn and F. Strassmann Über den Nachweis und das Verhalten der bei der Bestrahlung des Urans mittels Neutronen entstehenden Erdalkalimetalle (On the detection and characteristics of the alkaline earth metals formed by irradiation of uranium with neutrons), Naturwissenschaften Volume 27, Number 1, 11-15 (1939). The authors were identified as being at the Kaiser-Wilhelm-Institut für Chemie, Berlin-Dahlem. Received 22 December 1938.
  3. ^ Lise Meitner and O. R. Frisch Disintegration of Uranium by Neutrons: a New Type of Nuclear Reaction, Nature, Volume 143, Number 3615, 239-240 (11 February 1939). The paper is dated 16 January 1939. Meitner is identified as being at the Physical Institute, Academy of Sciences, Stockholm. Frisch is identified as being at the Institute of Theoretical Physics, University of Copenhagen.
  4. ^ O. R. Frisch Physical Evidence for the Division of Heavy Nuclei under Neutron Bombardment, Nature, Volume 143, Number 3616, 276-276 (18 February 1939). The paper is dated 17 January 1939. [The experiment for this letter to the editor was conducted on 13 January 1939; see Richard Rhodes The Making of the Atomic Bomb 263 and 268 (Simon and Schuster, 1986).]
  5. ^ Bernstein 2001, p. 281
  6. ^ "The Nobel Prize in Chemistry 1944". Nobel Foundation. Retrieved 2007-12-17. 
  7. ^ a b "The Nobel Prize in Chemistry 1944: Presentation Speech". Nobel Foundation. Retrieved 2008-01-03. 
  8. ^ Ruth Lewin Sime From Exceptional Prominence to Prominent Exception: Lise Meitner at the Kaiser Wilhelm Institute for Chemistry Ergebnisse 24 Forschungsprogramm Geschichte der Kaiser-Wilhelm-Gesellschaft im Nationalsozialismus (2005).
  9. ^ Ruth Lewin Sime Lise Meitner: A Life in Physics (University of California, 1997).
  10. ^ Elisabeth Crawford, Ruth Lewin Sime, and Mark Walker A Nobel Tale of Postwar Injustice, Physics Today Volume 50, Issue 9, 26-32 (1997).
  11. ^ Bernstein 2001, pp. 283, 323
  12. ^ Bernstein 2001, pp. 286, 323-235
  13. ^ Bernstein 2001, pp. 311, 325
  14. ^ (IUPAC 1994 recomm)
  15. ^ (IUPAC 1997 recomm)
  16. ^ a b c d "Science in the Third Reich", Margit Szöllösi-Janze. Berg Publishers, 2001. ISBN 1859734219, 9781859734216. Retrieved March 16, 2010.


  • Bernstein, Jeremy (2001), Hitler's Uranium Club: The Secret recordings at Farm Hall (2nd ed.), New York, NY: Springer-Verlag, ISBN 0-387-95089-3 

External links


Up to date as of January 14, 2010

From Wikiquote

Otto Hahn (8 March 187928 July 1968) was a German chemist and received the 1944 Nobel Prize in Chemistry. He is considered a pioneer of radioactivity and radiochemistry.


  • Gewönlich wird eine Entdeckung nicht auf den einfachsten, sondern auf einem komplizierten Wege gemacht; die einfachen Fälle zeigen sich erst später.
    • Usually, a discovery is not made in the easiest but on a complicated way; the simple cases show up only later.
      • Otto Hahn (1962). Vom Radiothor zur Uranspaltung. Eine wissenschaftliche Selbstbiographie. Vieweg+Teubner, Braunschweig.   As quoted in Dietrich Hahn (1988). Otto Hahn, Leben und Werk in Texten und Bildern. Insel, Frankfurt. p. 120. ISBN 3-458-32789-4.  

Quotations about Hahn

  • "Hahn is a capital fellow, and has done his work admirably. I am sure that you would enjoy having him to work with you." (Prof. Dr. Sir William Ramsay, London, to Prof. Dr. Ernest Rutherford, Montreal, 1905).
  • "He is a pleasant fellow, unassuming, completely trustworthy and highly talented - and I have come to like him very much. I can strongly recommend him as one of the best workers I know." (Prof. Dr. Sir William Ramsay, London, to Prof. Dr. Emil Fischer, Berlin, 1905).
  • "Hahn has a special nose for discovering new elements." (Prof. Dr. Ernest Rutherford, Montreal, 1906).
    • variant: "Hahn has a special smell for discovering new elements" as quoted by Dietrich Hahn (1988). Otto Hahn, Leben und Werk in Texten und Bildern. Insel, Frankfurt. p. 59. ISBN 3-458-32789-4.  
  • "He is doing the best work in Germany at present." (Prof. Dr. Ernest Rutherford, Manchester, 1910).
  • "Dr. Hahn is not reliable of speech, when speaking of himself. He says he is not learned, not distinguished, not famous as a scientist. He sacrifices truth to modesty - and I sympathize with him in his temptation." (Dr. Ronald E. Knowles, Toronto, 1933).
  • "Your discovery has caused a huge sensation in the whole scientific world, and every laboratory which has the necessary means is now working on the consequences of your discovery." (Prof. Dr. Rudolf Ladenburg, Princeton, February 22nd, 1939).
  • "It must certainly be a great joy for you and Strassmann that you have made the whole world of physics excited. That is really wonderful!" (Prof. Dr. Lise Meitner, Stockholm, to Otto Hahn, February 24th, 1939).
  • "Otto Hahn's humane and scientific personality is an indivisible whole. A very lively intellectual intuition, a very sound ability, an exceptional and critical ability for observation, an unshakeable dependability and doggedness next to great inner modesty and natural kindness mark the man as they do his work." (Prof. Dr. Lise Meitner, Stockholm, 1939).
  • "A man of the world. He has been the most helpful of the professors and his sense of humour and common sense has saved the day on many occasions. He is definitely friendly disposed to England and America." (Major Terence H. Rittner, Farmhall near Cambridge, summer 1945).
  • "Never has a Nobelprize-winner been in the outward sense so absent at a Nobel festival as Professor Hahn. And I suppose, too, that no Nobelprize-winner has ever, through the consequences of his discoveries, been so intensely present to our consciousness. Alfred Nobel hoped that in dynamite he had discovered such a powerful explosive that future wars would be impossible. The hope was not fulfilled; but dynamite is used today mostly for peaceful purposes. May we venture to hope the same of atomic energy? Hahn's discovery of the cleavage of atoms is the crowning feat, so far, in a series of discoveries for which Nobelprizes have been awarded. We acclaim today this celebrated researcher's scientific achievements." (Prof. Dr. Axel Hugo Theorell at the Nobelprize ceremony, Stockholm, December 10th, 1945).
  • "No living man has so successfully spanned the world of discovery from radiothorium to fission, one of the greatest - if not the greatest - discovery of all times." (Prof. Dr. Samuel C. Lind, Minneapolis, 1951).
  • "With his humour and his sound humanity Otto Hahn quickly gained ground at the Geneva Conference to which we other members of the German delegation became very indebted. We even went to the official Soviet reception, at which we were also able to bask in Hahn's fame. This visit took place against resistance from the Foreign Office, for the Federal Republic of Germany had no diplomatic relations with Moscow." (Prof. Dr. Karl Winnacker, Bonn, 1955).
  • "The discovery of nuclear fission by Otto Hahn and Fritz Strassmann opened up a new era in human history. It seems to me that what makes the science behind this discovery so remarkable is that it was achieved by purely chemical means." (Prof. Dr. Lise Meitner, Stockholm, 1955).
  • "The significance accorded to the outcome from the scientific point of view becomes clear when one reads in the first publication of nuclear fission that Professor Hahn, who had over thirty years of practical and theoretical experience in the sphere of radioactivity and whose judgement unquestionably commanded the greatest weight among fellow scientists both in Germany and the whole world, announced the new discovery only hesitatingly. The radiochemical methods he applied, which were partly developed by him, tested out hundreds of times in the course of thirty years, and found to be reliable, did not permit any doubt about the finding." (Prof. Dr. Fritz Strassmann, Mainz, 1956).
  • "Otto Hahn is a figure of world history. But he possesses none of the attributes of the traditional luminaries in history books. His slight, somewhat bowed figure, which with its high brow has the effect of his features having been carved, with his expression of searching honesty and critical inviolability, have something of a boundless nobility about them." (The Observer, London, June 9th, 1957).
  • "Hahn is an old wally who can not hold back his tears or sleep at night if he thinks of Hiroshima." (Franz Josef Strauss, German Minister of Defence, Bonn, 1957).
  • "His father city Frankfurt am Main thus honours a scholar of worldwide fame, who, as a result of his trail-blazing discoveries in the sphere of atomic research, radioactivity and radiochemistry, enjoys a surpassing reputation in the world. The city at the same time stresses its bonds with a personality of exceptional talent and creative energy, whose scientific and administrative work serve progress and the well-being of the whole of humanity." (The attestation of honorary citizenship in the diploma of the City of Frankfurt am Main, 1959).
  • "Hahn and Strassmann were able to discover nuclear fission by exceptionally good chemistry, fantastically good chemistry, which was way ahead of what anyone else was capable of at that time. The Americans learned it to do later. But at that time, in 1938, Hahn and Strassmann were really the only ones who could do it, because they were such good chemists." (Prof. Dr. Lise Meitner in an interview with the German television, ARD, March 8, 1959).
  • "Professor Meitner stated that nuclear fission could be attributed to chemistry. I have to make a slight correction. Chemistry merely isolated the individual substances, but did not precisely identify them. It took Professor Hahn's method to do this. This was his achievement." (Prof. Dr. Fritz Strassmann in the same interview with the German television, ARD, March 8, 1959).
  • "Otto Hahn was also in Geneva. He was small and quiet, with a retiring manner. Little tufts of thin white hair framed his face, and there was often a bewildered expression in his blue eyes, as if he were still astonished at the great things that had come from his discovery of fission." (Dr. Laura Fermi, widow of Prof. Dr. Enrico Fermi, Chicago, 1961).
  • "I must emphasise, that this proof of fission with such a low presence of the identifying preparation was in actuality a masterpiece of radiochemistry, in which at that time hardly anybody else other than Otto Hahn and Strassmann would have been able to succeed." (Prof. Dr. Lise Meitner, Cambridge, 1963).
  • "Can one, may one, hold the researcher responsible for the consequences of his work? Everyone who knew Otto Hahn knew with what unsparing clarity he had put this question to himself. We admire him, who as a researcher in his work, just as much as a man in his thought and deed, was ever a model of uprightness and conscientiousness, and even more so by the questions and answers he raised and gave by virtue of his personal conduct." (Prof. Dr. Max Steenbeck, Berlin, 1964).
  • "It has been given to very few men to make contributions to science and to humanity of the magnitude of those made by Otto Hahn. He has made those contributions over a span of nearly two generations, beginning with a key role in the earliest days of radiochemistry in investigating and unraveling the complexities of the natural radioactivities and culminating with his tremendous discovery of the nuclear fission of uranium. I believe that it is fair to refer to Otto Hahn as the father of radiochemistry and of its more recent offspring, nuclear chemistry. For his special genius the world of science will be forever grateful." (Prof. Dr. Glenn T. Seaborg, President of the United States Atomic Energy Commission, Washington, 1966).
  • "In postwar Germany, Otto Hahn became the most revered elder statesman of what had once been Europe's proudest scientific establishment. He collected many awards, including a Nobelprize in Chemistry for his discovery of fission. But he always accepted such honours with characteristic humility. Visiting an atomic reactor or nuclear power station, he would shrug modestly: 'It has all been the work of others.' In a soon-to-be-published 300-page memoir, he brushed off his historic workin fewer than five pages. Last week, at he age of 89, the father of fission died peacefully in his beloved Göttingen." (TIME Magazine, New York, August 9th, 1968).
  • "There are occurrences far removed from social and political events, let alone any sensation, and without relation to the course of history - and yet their taking place leads the world, deeply moved, to hold its breath for a moment, and people, far and wide, to halt for a moment of reflection amid the rush of the everyday: Otto Hahn, almost 90 years old, has left the world. A good, a simple man has entered his name in both the history of the natural sciences and the history of humanity. As long as intellect and character, scholarship and humanity maintain their value, Otto Hahn will be of relevance to the coming generations." (Prof. Dr. Walther Gerlach, Munich, 1968).
  • "Hahn remained modest and informal all his life. His disarming frankness, unfailing kindness, good common sense and impish humour will be remembered by his many friends all over the world." (Prof. Dr. Otto Robert Frisch, Cambridge, 1968).
  • "The number of those who had been able to be near Otto Hahn is small. His behaviour was completely natural to him, but for the next generations he will serve as a model, regardless of whether one admires in the attitude of Otto Hahn his humane and scientific sense of responsibility or his personal courage." (Prof. Dr. Fritz Strassmann, Mainz, 1968).
  • "Otto Hahn's achievements are known universally and will hold a special place in the history of science. He is remembered too for his whole character, his generosity of spirit, his belief in the proper use of scientific discovery and for his humanity." (The Royal Society, London, 1970).
  • "He had an honesty and integrity which commanded the respect and trust of all." (Prof. Dr. Sir James Chadwick, Cambridge, 1970).
  • "It was remarkable, how, after the war, this rather unassuming scientist who had spent a lifetime in the laboratory, became an effective administrator and an important public figure in Germany. Hahn, famous as the discoverer of nuclear fission, was respected and trusted for his human qualities, simplicity of manner, transparent honesty, common sense and loyalty." (Prof. Dr. Robert Spence, London, 1970).
  • "I often thought, that he would have deserved a second Nobelprize - the Nobelprize for peace." (Prof. Dr. Elizabeth Rona, Miami, 1978).
  • "He was one of my models." (Prof. Dr. Linus Pauling, Pasadena, at the Nobel conference in Lindau, Bavaria, 1981).
  • "Otto Hahn is widely portrayed as a warm, considerate, charming person. The characterization is accurate. In fact, precisely because the personality of this decent human being suffered no great changes throughout his career, he offers us a touchstone to determined the extent of changes in scientists' perceptions of their obligations to society during the twentieth century. The important thing is not that scientists may disagree on where their responsibility to society lies, but that they are conscious that a responsibility exists, are vocal about it, and when they speak out they expect to affect policy. Otto Hahn, it would seem, was even more than just an example of this twentieth-century conceptual evolution; he was a leader in the process." (Prof. Dr. Lawrence Badash, Santa Barbara, California, 1983).
  • "The discovery by Otto Hahn that the uranium nucleus could be split marks, on the one hand, the culmination of one of the most fascinating periods in the history of physics and, on the other, heralds the advent of a new age in Man's understanding and mastery of nature." (Prof. Dr. William R. Shea, Montreal, 1983).
  • "Ever since my early youth, I have admired Otto Hahn as a scientist and a human being. The reason for Hahn's peace work was simply that, knowing more than other citizens about atomic weapons, he felt it his duty to speak about this issue that was so crucial for mankind. He could make things clear, he had to use his knowledge. And it is why Otto Hahn, with atomic weapons in mind, wrote shortly before his death of 'the necessity of world peace'." (Prof. Dr. Sir Karl R. Popper, Kenley near London, 1993).
  • "Thanks to his moral integrity Otto Hahn was trusted everywhere. He used it to point uncompromisingly to three important goals. For him the cessation of nuclear weapon tests, not transferring atomic weapons in order not to let the number of atomic powers become larger, and general disarmament were the essential challenges. Hahn occasionally emphasised that he was not a politician. Yet his speeches, appeals, warnings, and his appearance in public betrayed a purposeful political engagement. His distinctively humanitarian convictions directed him logically to this path. - As we must conclude, Otto Hahn is not to be held personally responsible for the consequences of his discovery, but he suffered from them and because of the constantly smouldering conflicts of conscience became a tireless watchman for the world of a life worth living, at peace, without anxiety caused by the atom. His engagement with science, humanity and peace is exemplary and to be remembered for following generations." (Dr. Klaus Hoffmann, Dresden, author of 'Otto Hahn - Achievement and Responsibility', New York etc. 2001).

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Otto Hahn (8 March 1879 – 28 July 1968) was a German Nobel Prize winning chemist. He did important research into the atom and he discovered nuclear fission (splitting an atom) in 1939.[1]



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