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Walther Bothe

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Walther Bothe

Walther Bothe
Walther Bothe in the 1950s
Born (1891-01-08)8 January 1891
Oranienburg, German Empire
Died 8 February 1957(1957-02-08) (aged 66)
Heidelberg, West Germany
Nationality Germany
Fields Physics, mathematics, chemistry
Institutions University of Berlin
University of Giessen
University of Heidelberg
Max Planck Institute for Medical Research
Alma mater University of Berlin
Doctoral advisor Max Planck
Doctoral students Hans Ritter von Baeyer
Known for Coincidence circuit
Notable awards Nobel Prize for Physics (1954)
Max Planck Medal (1953)

Walther Wilhelm Georg Bothe (8 January 1891 – 8 February 1957) was a German nuclear physicist, who shared the Nobel Prize in Physics in 1954 with Max Born.

In 1913, he joined the newly created Laboratory for Radioactivity at the Reich Physical and Technical Institute (PTR), where he remained until 1930, the latter few years as the director of the laboratory. He served in the military during World War I from 1914, and he was a prisoner of war of the Russians, returning to Germany in 1920. Upon his return to the laboratory, he developed and applied coincidence methods to the study of nuclear reactions, the Compton effect, cosmic rays, and the wave-particle duality of radiation, for which he would receive the Nobel Prize in Physics in 1954.

In 1930 he became a full professor and director of the physics department at the University of Giessen. In 1932, he became director of the Physical and Radiological Institute at the University of Heidelberg. He was driven out of this position by elements of the deutsche Physik movement. To preclude his emigration from Germany, he was appointed director of the Physics Institute of the Kaiser Wilhelm Institute for Medical Research (KWImF) in Heidelberg. There, he built the first operational cyclotron in Germany. Furthermore, he became a principal in the German nuclear energy project, also known as the Uranium Club, which was started in 1939 under the supervision of the Army Ordnance Office.

In 1946, in addition to his directorship of the Physics Institute at the KWImf, he was reinstated as a professor at the University of Heidelberg. From 1956 to 1957, he was a member of the Nuclear Physics Working Group in Germany.

In the year after Bothe's death, his Physics Institute at the KWImF was elevated to the status of a new institute under the Max Planck Society and it then became the Max Planck Institute for Nuclear Physics. Its main building was later named Bothe laboratory.


  • Education 1
  • Career 2
    • Early years 2.1
    • Heidelberg 2.2
    • 1st German Cyclotron 2.3
    • Uranium Club 2.4
    • Post WW II 2.5
  • Personal 3
  • Honors 4
  • Internal Reports 5
  • Selected literature by Bothe 6
  • Books by Bothe 7
  • See also 8
  • Notes 9
  • Bibliography 10
  • External links 11


Bothe was born to Fredrich Bothe and Charlotte Hartung. From 1908 to 1912, Bothe studied at the Friedrich-Wilhelms-Universität (today, the Humboldt-Universität zu Berlin). In 1913, he was Max Planck's teaching assistant. He was awarded his doctorate, in 1914, under Planck.[1][2]


Early years

In 1913, Bothe joined the Physikalisch-Technische Reichsanstalt (PTR, Reich Physical and Technical Institute; today, the Physikalisch-Technische Bundesanstalt), where he stayed until 1930. Hans Geiger had been appointed director of the new Laboratory for Radioactivity there in 1912. At the PTR, Bothe was an assistant to Geiger from 1913 to 1920, a scientific member of Geiger's staff from 1920 to 1927, and from 1927 to 1930 he succeeded Geiger as director of the Laboratory for Radioactivity.[1][2][3][4]

In May 1914, Bothe volunteered for service in the German cavalry. He was taken prisoner by the Russians and incarcerated in Russia for five years. While there, he learned the Russian language and worked on theoretical physics problems related to his doctoral studies. He returned to Germany in 1920, with a Russian bride.[3]

Upon his return from Russia, Bothe continued his employment at the PTR under Hans Geiger in the Laboratory for Radioactivity there. In 1924, Bothe published on his coincidence method. Then and in the following years, he applied this method to the experimental study of the nuclear reactions, the Compton effect, and the wave-particle duality of light. Bothe's coincidence method and his applications of it earned him the Nobel Prize in Physics in 1954.[4][5][6][7]

In 1925, while still at the PTR, Bothe became a Privatdozent at the University of Berlin, which means that he had completed his Habilitation, and, in 1929, he became an ausserordentlicher Professor (extraordinarius professor) there.[1][2]

In 1927, Bothe began the study of the transmutation of light elements through bombardment with alpha particles. From a joint investigation with H. Fränz and Heinz Pose in 1928, Bothe and Fränz correlated reaction products of nuclear interactions to nuclear energy levels.[3][4][7]

In 1929, in collaboration with Werner Kolhörster and Bruno Rossi who were guests in Bothe's laboratory at the PTR, Bothe began the study of cosmic rays. The study of cosmic radiation would be conducted by Bothe for the rest of his life.[4][7]

In 1930, he became an ordentlicher Professor (ordinarius professor) and director of the physics department at the Justus Liebig-Universität Gießen. That year, working with Herbert Becker, Bothe bombarded beryllium, boron, and lithium with alpha particles from polonium and observed a new form of penetrating radiation. In 1932, James Chadwick identified this radiation as the neutron.[1][2][3]


Walther Bothe

In 1932, Bothe had succeeded Arnold Flammersfeld (1939–1941). Also included on his staff were Peter Jensen and Erwin Fünfer.[1][2][3][11][12][13][14]

In 1938, Bothe and Gentner published on the energy dependence of the nuclear photo-effect. This was the first clear evidence that nuclear absorption spectra are accumulative and continuous, an effect known as the dipolar giant nuclear resonance. This was explained theoretically a decade later by physicists J. Hans D. Jensen, Helmut Steinwedel, Peter Jensen, Michael Goldhaber, and Edward Teller.[3]

Also in 1938, Maier-Leibniz built a Wilson cloud chamber. Images from the cloud chamber were used by Bothe, Gentner, and Maier-Leibniz to publish, in 1940, the Atlas of Typical Cloud Chamber Images, which became a standard reference for identifying scattered particles.[3][7]

1st German Cyclotron

By the end of 1937, the rapid successes Bothe and Gentner had with the building and research uses of a Van de Graaff generator had led them to consider building a cyclotron. By November, a report had already been sent to the President of the Kaiser-Wilhelm Gesellschaft (KWG, Kaiser Wilhelm Society; today, the Max Planck Society), and Bothe began securing funds from the Helmholtz-Gesellschaft (Helmholtz Society; today, the Helmholtz Association of German Research Centres), the Badischen Kultusministerium (Baden Ministry of Culture), I.G. Farben, the KWG, and various other research oriented agencies. Initial promises led to ordering a magnet from Siemens in September 1938, however, further financing then became problematic. In these times, Gentner continued his research on the nuclear photoeffect, with the aid of the Van de Graaff generator, which had been upgraded to produce energies just under 1 MeV. When his line of research was completed with the 7Li (p, gamma) and the 11B (p, gamma) reactions, and on the nuclear isomer 80Br, Gentner devoted his full effort to the building of the planned cyclotron.[15]

In order to facilitate the construction of the cyclotron, at the end of 1938 and into 1939, with the help of a fellowship from the Helmholtz-Gesellschaft, Gentner was sent to Radiation Laboratory of the University of California (today, the Lawrence Berkeley National Laboratory) in Berkeley, California. As a result of the visit, Gentner formed a cooperative relationship with Emilio G. Segrè and Donald Cooksey.[15]

After the armistice between France and Germany in the summer of 1940, Bothe and Gentner received orders to inspect the cyclotron Frédéric Joliot-Curie had built in Paris. While it had been built, it was not yet operational. In September 1940, Gentner received orders to form a group to put the cyclotron into operation. Hermann Dänzer from the University of Frankfurt participated in this effort. While in Paris, Gentner was able to free both Frédéric Joliot-Curie and Paul Langevin, who had been arrested and detained. At the end of the winter of 1941/1942, the cyclotron was operational with a 7-MeV beam of deuterons. Uranium and thorium were irradiated with the beam, and the byproducts were sent to Otto Hahn at the Kaiser-Wilhelm Institut für Chemie (KWIC, Kaiser Wilhelm Institute for Chemistry, today, the Max Planck Institute for Chemistry), in Berlin. In mid-1942, Gentner's successor in Paris, was Wolfgang Riezler from Bonn.[15][16][17]

It was during 1941 that Bothe had acquired all the necessary funding to complete construction of the cyclotron. The magnet was delivered in March 1943, and the first beam of deuteron was emitted in December. The inauguration ceremony for the cyclotron was held on 2 June 1944. While there had been other cyclotrons under construction, Bothe's was the first operational cyclotron in Germany.[2][15]

Uranium Club

The Klaus Clusius, Robert Döpel, Werner Heisenberg, and Carl Friedrich von Weizsäcker. With Bothe being one of the principals, Wolfgang Gentner, Arnold Flammersfeld, Rudolf Fleischmann, Erwin Fünfer, and Peter Jensen were soon drawn into work for the Uranverein. Their research was published in the Kernphysikalische Forschungsberichte (Research Reports in Nuclear Physics); see below the section Internal Reports. For the Uranverein, Bothe, and up to 6 members from his staff by 1942, worked on the experimental determination of atomic constants, the energy distribution of fission fragments, and nuclear cross sections. Bothe's erroneous experimental results on the absorption of neutrons in graphite were central in the German decision to favor heavy water as a neutron moderator.[18][19][20]

By late 1941 it was apparent that the nuclear energy project would not make a decisive contribution to ending the war effort in the near term. HWA control of the Uranverein was relinquished to the RFR in July 1942. The nuclear energy project thereafter maintained its kriegswichtig (important for the war) designation and funding continued from the military. However, the German nuclear power project was then broken down into the following main areas: Auergesellschaft, and the II. Physikalisches Institut at the University of Vienna.[21][19][22][23]

Post WW II

From 1946, to 1957, in addition to his position at the KWImF, Bothe was an ordentlicher Professor (ordinarius professor) at the University of Heidelberg.[1][2]

At the end of World War II, the Allies had seized the cyclotron at Heidelberg. In 1949, its control was returned to Bothe.[1]

During 1956 and 1957, Bothe was a member of the Arbeitskreis Kernphysik (Nuclear Physics Working Group) of the Fachkommission II "Forschung und Nachwuchs" (Commission II "Research and Growth") of the Deutschen Atomkommission (DAtK, German Atomic Energy Commission). Other members of the Nuclear Physics Working Group in both 1956 and 1957 were: Werner Heisenberg (chairman), Hans Kopfermann (vice-chairman), Fritz Bopp, Wolfgang Gentner, Otto Haxel, Willibald Jentschke, Heinz Maier-Leibnitz, Josef Mattauch, Wolfgang Riezler, Wilhelm Walcher, and Carl Friedrich von Weizsäcker. Wolfgang Paul was also a member of the group during 1957.[23]

At the end of 1957, Gentner was in negotiations with Otto Hahn, President of the Max-Planck Gesellschaft (MPG, Max Planck Society, successor of the Kaiser-Wilhelm Gesellschaft), and with the Senate of the MPG to establish a new institute under their auspices. Essentially, Walther Bothe's Institut für Physik at the Max-Planck Institut für medizinische Forschung, in Heidelberg, was to be spun off to become a full fledged institute of the MPG. The decision to proceed was made in May 1958. Gentner was named the director of the Max-Planck Institut für Kernphysik (MPIK, Max Planck Institute for Nuclear Physics) on 1 October, and he also received the position as an ordentlicher Professor (ordinarius professor) at the University of Heidelberg. Bothe had not lived to see the final establishment of the MPIK, as he had died in February of that year.[15][24]

Bothe was a German patriot who did not give excuses for his work with the Uranverein. However, Bothe's impatience with National Socialist policies in Germany brought him under suspicion and investigation by the Gestapo.[3]


As a result of his incarceration in Russia during World War I as a prisoner of war, he met Barbara Below, whom he married in 1920. They had two children. She preceded him in death by some years.[7]

Bothe was an accomplished painter and musician; he played the piano.[7]


Bothe was awarded a number of honors:[7]

  • 1952 – Knight of the Order of Merit for Sciences and the Arts
  • 1954 – Nobel Prize in Physics "for the coincidence method and his discoveries made therewith". Bothe received half of the prize; the other half was awarded to Max Born.

Internal Reports

The following reports were published in Kernphysikalische Forschungsberichte (Research Reports in Nuclear Physics), an internal publication of the German Uranverein. The reports were classified Top Secret, they had very limited distribution, and the authors were not allowed to keep copies. The reports were confiscated under the Allied Operation Alsos and sent to the United States Atomic Energy Commission for evaluation. In 1971, the reports were declassified and returned to Germany. The reports are available at the Karlsruhe Nuclear Research Center and the American Institute of Physics.[25][26]

  • Walther Bothe Die Diffusionsläge für thermische Neutronen in Kohle G12 (7 June 1940)
  • Walther Bothe Die Abmessungen endlicher Uranmaschinen G-13 (28 June 1940)
  • Walther Bothe Die Abmessungen von Maschinen mit rücksteuendem Mantel G-14 (17 July 1941)
  • Walther Bothe and Wolfgang Gentner Die Energie der Spaltungsneutronen aus Uran G-17 (9 May 1940)
  • Walther Bothe Einige Eigenschaften des U und der Bremsstoffe. Zusammenfassender Bericht über die Arbeiten G-66 (28 March 1941)
  • Walther Bothe and Arnold Flammersfeld Die Wirkungsquerschnitte von 38[27] für thermische Neutronen aus Diffusionsmessungen G-67 (20 January 1941)
  • Walther Bothe and Arnold Flammersfeld Resonanzeinfang an einer Uranoberfläche G-68 (8 March 1940)
  • Walther Bothe and Arnold Flammersfeld Messungen an einem Gemisch von 38-Oxyd und –Wasser; der Vermehrungsfakto K unde der Resonanzeinfang w. G-69 (26 May 1941)
  • Walther Bothe and Arnold Flammersfeld Die Neutronenvermehrung bei schnellen und langsamen Neutronen in 38 und die Diffusionslänge in 38 Metall und Wasser G-70 (11 July 1941)
  • Walther Bothe and Peter Jensen Die Absorption thermischer Neutronen in Elektrographit G-71 (20 January 1941)
  • Walther Bothe and Peter Jensen Resonanzeinfang an einer Uranoberfläche G-72 (12 May 1941)
  • Walther Bothe and Arnold Flammersfeld Versuche mit einer Schichtenanordnung von Wasser und Präp 38 G-74 (28 April 1941)
  • Walther Bothe and Erwin Fünfer Absorption thermischer Neutronen und die Vermehrung schneller Neutronen in Beryllium G-81 (10 October 1941)
  • Walther Bothe Maschinen mit Ausnutzung der Spaltung durch schnelle Neutronen G-128 (7 December 1941)
  • Walther Bothe Über Stahlenschutzwäne G-204 (29 June 1943)
  • Walther Bothe Die Forschungsmittel der Kernphysik G-205 (5 May 1943)
  • Walther Bothe and Erwin Fünfer Schichtenversuche mit Variation der U- und D2O-Dicken G-206 (6 December 1943)

Selected literature by Bothe

  • Walther Bothe and Hans Geiger Ein Weg zur experimentellen Nachprüfung der Theorie von Bohr, Kramers und Slater, Z. Phys. Volume 26, Number 1, 44 (1924)
  • Walther Bothe Theoretische Betrachtungen über den Photoeffekt, Z. Phys. Volume 26, Number 1, 74–84 (1924)
  • Walther Bothe and Hans Geiger Experimentelles zur Theorie von Bohr, Kramers und Slater, Die Naturwissenschaften Volume 13, 440–441 (1925)
  • Walther Bothe and Hans Geiger Über das Wesen des Comptoneffekts: ein experimenteller Beitrag zur Theories der Strahlung, Z. Phys. Volume 32, Number 9, 639–663 (1925)
  • W. Bothe and W. Gentner Herstellung neuer Isotope durch Kernphotoeffekt, Die Naturwissenschaften Volume 25, Issue 8, 126–126 (1937). Received 9 February 1937. Institutional affiliation: Institut für Physik at the Kaiser-Wilhelm Institut für medizinische Forschung.
  • Walther Bothe The Coincidence Method, The Nobel Prize in Physics 1954, (1954)

Books by Bothe

  • Walther Bothe Der Physiker und sein Werkzeug (Gruyter, 1944)
  • Walther Bothe and Siegfried Flügge Kernphysik und kosmische Strahlen. T. 1 (Dieterich, 1948)
  • Walther Bothe Der Streufehler bei der Ausmessung von Nebelkammerbahnen im Magnetfeld (Springer, 1948)
  • Walther Bothe and Siegfried Flügge (editors) Nuclear Physics and Cosmic Rays (FIAT Review of German Science 1939–1945, Volumes 13 and 14 (Klemm, 1948) ][28]
  • Walther Bothe Theorie des Doppellinsen-b-Spektrometers (Springer, 1950)
  • Walther Bothe Die Streuung von Elektronen in schrägen Folien (Springer, 1952)
  • Walther Bothe and Siegfried Flügge Kernphysik und kosmische Strahlen. T. 2 (Dieterich, 1953)
  • Karl H. Bauer and Walther Bothe Vom Atom zum Weltsystem (Kröner, 1954)

See also


  1. ^ a b c d e f g Hentschel, Appendix F; see the entry for Bothe.
  2. ^ a b c d e f g Mehra, Jagdish, and Helmut Rechenberg (2001) The Historical Development of Quantum Theory. Volume 1 Part 2 The Quantum Theory of Planck, Einstein, Bohr and Sommerfeld 1900–1925: Its Foundation and the Rise of Its Difficulties. Springer, ISBN 0-387-95175-X. p. 608
  3. ^ a b c d e f g h Walther Bothe and the Physics Institute: the Early Years of Nuclear Physics,
  4. ^ a b c d Bothe, Walther (1954) The Coincidence Method, The Nobel Prize in Physics 1954,
  5. ^ Hentschel, Appendix F; see the entry for Geiger.
  6. ^ Fick, Dieter and Kant, Horst Walther Bothe’s contributions to the particle-wave dualism of light.
  7. ^ a b c d e f g Walther Bothe Biography, The Nobel Prize in Physics 1954,
  8. ^ Beyerchen, pp. 141–167.
  9. ^ Beyerchen, pp. 79–102.
  10. ^ Beyerchen, pp. 103–140.
  11. ^ Hentschel, Appendix F; see the entry of Fleischmann.
  12. ^ Das Physikalische und Radiologische Institut der Universität Heidelberg, Heidelberger Neueste Nachrichten Volume 56 (7 March 1913).
  13. ^ States, David M. (28 June 2001) A History of the Kaiser Wilhelm Institute for Medical Research: 1929–1939: Walther Bothe and the Physics Institute: The Early Years of Nuclear Physics,
  14. ^ Landwehr, Gottfried (2002) Rudolf Fleischmann 1.5.1903 – 3.2.2002, Nachrufe – Auszug aus Jahrbuch pp. 326–328.
  15. ^ a b c d e Ulrich Schmidt-Rohr Wolfgang Gentner: 1906–1980 (Universität Heidelberg).
  16. ^ Jörg Kummer Hermann Dänzer: 1904–1987 (University of Frankfurt).
  17. ^ Powers, Thomas (1993) Heisenberg's War: The Secret History of the German Bomb. Knopf. ISBN 0306810115. p. 357.
  18. ^ Hentschel, pp. 363–364 and Appendix F; see the entries for Diebner and Döpel. See also the entry for the KWIP in Appendix A and the entry for the HWA in Appendix B.
  19. ^ a b Macrakis, Kristie (1993). Surviving the Swastika: Scientific Research in Nazi Germany. Oxford. pp. 164–169.  
  20. ^ Mehra, Jagdish and Rechenberg, Helmut (2001) The Historical Development of Quantum Theory. Volume 6. The Completion of Quantum Mechanics 1926–1941. Part 2. The Conceptual Completion and Extension of Quantum Mechanics 1932–1941. Epilogue: Aspects of the Further Development of Quantum Theory 1942–1999. Springer. ISBN 978-0-387-95086-0. pp. 1010–1011.
  21. ^ Hentschel, see the entry for the KWIP in Appendix A and the entries for the HWA and the RFR in Appendix B. Also see p. 372 and footnote #50 on p. 372.
  22. ^ Walker, pp. 49–53.
  23. ^ a b Kant, Horst (2002) Werner Heisenberg and the German Uranium Project / Otto Hahn and the Declarations of Mainau and Göttingen. Max-Planck Institut für Wissenschaftsgeschichte.
  24. ^ Max Planck Institute for Nuclear Physics, Innovations Report.
  25. ^ Hentschel, Appendix E; see the entry for Kernphysikalische Forschungsberichte.
  26. ^ Walker, 268–274.
  27. ^ Präparat 38, 38-Oxyd, and 38 were the cover names for uranium oxide; see Deutsches Museum.
  28. ^ There were 50-odd volumes of the FIAT Reviews of German Science, which covered the period 1930 to 1946 – cited by Max von Laue in Document 117, Hentschel, 1996, pp. 393–395. FIAT: Field Information Agencies, Technical.


  • Beyerchen, Alan D. (1977). Scientists Under Hitler: Politics and the Physics Community in the Third Reich. Yale University Press.  
  • Hentschel, Klaus and Hentschel, Ann M., ed. (1996). Physics and National Socialism: An Anthology of Primary Sources. Birkhäuser.  
  • Walker, Mark (1993). German National Socialism and the Quest for Nuclear Power 1939–1949. Cambridge.  

External links

  • Walther Bothe The Coincidence Method, The Nobel Prize in Physics 1954, (1954). Due to Bothe's illness, this lecture was not delivered orally.
    • Walther Bothe and the Physics Institute: the Early Years of Nuclear Physics,
    • Walther Bothe Biography, The Nobel Prize in Physics 1954,
  • Annotated Bibliography for Walter Bothe from the Alsos Digital Library for Nuclear Issues
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