Walther Bothe

Infobox Scientist
box_width = 300px
name = Walther Bothe


imagesize = 180px
caption = Walther Bothe
birth_date = January 8, 1891
birth_place = Oranienburg, Germany
death_date = February 8, 1957
death_place = Heidelberg, Germany
nationality = Germany
fields = Physics, mathematics, chemistry
workplaces = University of Berlin
University of Giessen
University of Heidelberg
Max Planck Institute for Medical Research
alma_mater = University of Berlin
doctoral_advisor = Max Planck
academic_advisor =
doctoral_students = Hans Ritter von Baeyer
notable_students =
known_for = Coincidence circuit
awards = nowrap|Nobel Prize for Physics (1954)
Max Planck Medal (1953)

Walther Wilhelm Georg Bothe (8 January 1891 in Oranienburg – 8 February 1957 in Heidelberg) was a German nuclear physicst.

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.

Education

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. [ Hentschel and Hentschel, 1996, Appendix F; see the entry for Bothe.] [ Mehra and Rechenberg, Volume 1, Part 2, 2001, pp. 608.]

Career

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, Both 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. [ Hentschel and Hentschel, 1996, Appendix F; see the entry for Bothe.] [ Mehra and Rechenberg, Volume 1, Part 2, 2001, pp. 608.] [ " [http://nobelprize.org/nobel_prizes/medicine/articles/states/walther-bothe.html Walther Bothe] and the Physics Institute: the Early Years of Nuclear Physics", Nobelprize.org.] [ Walther Bothe " [http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-lecture.html The Coincidence Method] ", "The Nobel Prize in Physics 1954", Nobelprize.org (1954).]

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. [ " [http://nobelprize.org/nobel_prizes/medicine/articles/states/walther-bothe.html Walther Bothe] and the Physics Institute: the Early Years of Nuclear Physics", Nobelprize.org.]

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. [ Hentschel and Hentschel, 1996, Appendix F; see the entry for Geiger.] [ Dieter Fick and Horst Kant " [http://web.science.uu.nl/HQ2/abstracts/Kant_Fick.pdf Walther Bothe’s contributions to the particle-wave dualism of light"] .] [ " [http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-bio.html Walther Bothe Biography] ", "The Nobel Prize in Physics 1954", Nobelprize.org.] [ Walther Bothe " [http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-lecture.html The Coincidence Method] ", "The Nobel Prize in Physics 1954", Nobelprize.org (1954).]

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. [ Hentschel and Hentschel, 1996, Appendix F; see the entry for Bothe.] [ Mehra and Rechenberg, Volume 1, Part 2, 2001, pp. 608.]

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. [ " [http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-bio.html Walther Bothe Biography] ", "The Nobel Prize in Physics 1954", Nobelprize.org.] [ " [http://nobelprize.org/nobel_prizes/medicine/articles/states/walther-bothe.html Walther Bothe] and the Physics Institute: the Early Years of Nuclear Physics", Nobelprize.org.] [ Walther Bothe " [http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-lecture.html The Coincidence Method] ", "The Nobel Prize in Physics 1954", Nobelprize.org (1954).]

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. [ " [http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-bio.html Walther Bothe Biography] ", "The Nobel Prize in Physics 1954", Nobelprize.org.] [ Walther Bothe " [http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-lecture.html The Coincidence Method] ", "The Nobel Prize in Physics 1954", Nobelprize.org (1954).]

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 H. 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. [ Hentschel and Hentschel, 1996, Appendix F; see the entry for Bothe.] [ Mehra and Rechenberg, Volume 1, Part 2, 2001, pp. 608.] [ " [http://nobelprize.org/nobel_prizes/medicine/articles/states/walther-bothe.html Walther Bothe] and the Physics Institute: the Early Years of Nuclear Physics", Nobelprize.org.]

Heidelberg

In 1932, Bothe had succeeded Philipp Lenard as Director of the "Physikalische und Radiologische Institut" (Physical and Radiological Institute) at the University of Heidelberg. It was then that Rudolf Fleischmann became a teaching assistant to Bothe. When Adolf Hitler became Chancellor of Germany on 30 January 1933, the concept of " deutsche Physik" took on more favor as well as fervor; "deutsche Physik", was anti-Semitic and anti-theoretical physics, especially modern physics, including quantum mechanics and both atomic and nuclear physics. As applied in the university environment, political factors took priority over the historically applied concept of scholarly ability, [ Beyerchen, 1997, 141-167.] even though its two most prominent supporters were the Nobel Laureates in Physics Philipp Lenard [ Beyerchen, 1977, 79-102.] and Johannes Stark. [ Beyerchen, 1977, 103-140.] Supporters of "deutsche Physik" launched vicious attacks against leading theoretical physicists. While Lenard was retired from the University of Heidelberg, he still had significant influence there. In 1934, Lenard had managed to get Bothe relieved of his directorship of the Physical and Radiological Institute at the University of Heidelberg, whereupon Bothe was able to become the Director of the "Institut für Physik" (Institute for Physics) of the "Kaiser-Wilhelm Institut für medizinische Forschung" (KWImF, Kaiser Wilhelm Institute for Medical Research; today, the Max-Planck Institut für medizinische Forschung), in Heidelberg, replacing Karl W. Hauser, who had recently died. Ludolf von Krehl, Director of the KWImF, and Max Planck, President of the Kaiser-Wilhelm Gesellschaft (KWG, Kaiser Wilhelm Society, today, the Max-Plank Gesellschaft), had offered the directorship to Bothe to ward off the possibility of his emigration. Bothe held the directorship of the Institute for Physics at the KWImF until his death in 1957. While at the KWImF, Bothe held an honorary professorship at the University of Heidelberg, which he held until 1946. Fleischmann went with Bothe and worked with him there until 1941. To his staff, Bothe recruited scientists including Wolfgang Gentner (1936 – 1945), Heinz Maier-Leibnitz (1936 - ?) - who had done his doctorate with the Nobel Laureate James Franck and was highly recommend by Robert Pohl and Georg Joos, and Arnold Flammersfeld (1939 – 1941). Also included on his staff were Peter Jensen and Erwin Fünfer. [ " [http://nobelprize.org/nobel_prizes/medicine/articles/states/walther-bothe.html Walther Bothe] and the Physics Institute: the Early Years of Nuclear Physics", Nobelprize.org.] [ Hentschel and Hentschel, 1996, Appendix F; see the entry of Fleischmann.] ] [ "Das Physikalische und Radiologische Institut der Universität Heidelberg", "Heidelberger Neueste Nachrichten" Volume 56 (7 March 1913).] [ David M. States "A History of the Kaiser Wilhelm Institute for Medical Research: 1929-1939: Walther Bothe and the Physics Institute: The Early Years of Nuclear Physics", "Nobelprize.org" ( [http://nobelprize.org/nobel_prizes/medicine/articles/states/index.html 28 June 2001] ).] [ Gottfried Landwehr, Gottfried "Rudolf Fleischmann 1.5.1903 – 3.2.2002", "Nachrufe – Auszug aus Jahrbuch" 326-328 [http://www.badw.de/publikationen/sonstige/nachrufe/2002/Fleischmann.pdf 2002] ).] [ Hentschel and Hentschel, 1996, Appendix F; see the entry for Bothe.] [ Mehra and Rechenberg, Volume 1, Part 2, 2001, pp. 608.]

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. [ " [http://nobelprize.org/nobel_prizes/medicine/articles/states/walther-bothe.html Walther Bothe] and the Physics Institute: the Early Years of Nuclear Physics", Nobelprize.org.]

Also in 1938, Maier-Leibnitz built a Wilson cloud chamber. Images from the cloud chamber were used by Bothe, Gentner, and Maier-Leibnitz to publish, in 1940, the "Atlas of Typical Cloud Chamber Images", which became a standard reference for identifying scattered particles. [ " [http://nobelprize.org/nobel_prizes/medicine/articles/states/walther-bothe.html Walther Bothe] and the Physics Institute: the Early Years of Nuclear Physics", Nobelprize.org.] [ " [http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-bio.html Walther Bothe Biography] ", "The Nobel Prize in Physics 1954", Nobelprize.org.]

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 Graaf 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-Gemeinschaft"), 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 Graaf 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. [ Ulrich Schmidt-Rohr "Wolfgang Gentner: 1906-1980" ( [http://www.physik.uni-frankfurt.de/paf/paf181.html Universität Heidelberg] ).]

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 vist, Gentner formed a cooperative relationship with Emilio G. Segrè and Donald Cooksey. [ Ulrich Schmidt-Rohr "Wolfgang Gentner: 1906-1980" ( [http://www.physik.uni-frankfurt.de/paf/paf181.html Universität Heidelberg] ).]

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. [ Ulrich Schmidt-Rohr "Wolfgang Gentner: 1906-1980" ( [http://www.physik.uni-frankfurt.de/paf/paf181.html Universität Heidelberg] ).] [ Jörg Kummer" [http://www.physik.uni-frankfurt.de/paf/paf194.html Hermann Dänzer: 1904-1987] " (University of Frankfurt).] [ Thomas Powers "Heisneberg’s War: The Secret History of the German Bomb" (Knopf, 1993) 357.]

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. [ Ulrich Schmidt-Rohr "Wolfgang Gentner: 1906-1980" ( [http://www.physik.uni-frankfurt.de/paf/paf181.html Universität Heidelberg] ).] [ Mehra and Rechenberg, Volume 1, Part 2, 2001, pp. 608.]

Uranium Club

The German nuclear energy project, also known as the "Uranverein" (Uranium Club), began in the spring of 1939 under the auspices of the "Reichsforschungsrat" (RFR, Reich Research Council) of the "Reichserziehungsministerium" (REM, Reich Ministry of Education). By 1 September, the "Heereswaffenamt" (HWA, Army Ordnance Office) squeezed out the RFR and took over the effort. Under the control of the HWA, the "Uranverein" had its first meeting on 16 September. The meeting was organized by Kurt Diebner, advisor to the HWA, and held in Berlin. The invitees included Walther Bothe, Siegfried Flügge, Hans Geiger, Otto Hahn, Paul Harteck, Gerhard Hoffmann, Josef Mattauch, and Georg Stetter. A second meeting was held soon thereafter and included Klaus Clusius, Robert Döpel, Werner Heisenberg, and Carl Friedrich von Weizsäcker. With Bothe being one of the principles, 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 experimental results on the absorption of neutrons in graphite were central in the German decision to favor heavy water as a neutron moderator. [ Hentschel and Hentschel, 1996, 363-364 and Appendix F; see the entries for Diebner and Döpel. See also the entry fro the KWIP in Appendix A and the entry for the HWA in Appendix B.] [ Kristie Macrakis "Surviving the Swastika: Scientific Research in Nazi Germany" (Oxford, 1993) pp. 164-169.] [ Jagdish Mehra and Helmut Rechenberg "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, 2001) pp. 1010-1011.]

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: uranium and heavy water production, uranium isotope separation, and the "Uranmaschine" (uranium machine, i.e., nuclear reactor). Also, the project was then essentially split up between nine institutes, where the directors dominated the research and set their own research agendas. Bothe’s "Institut für Physik" was one of the nine institutes. The other eight institutes or facilities were: the Institute for Physical Chemistry at the Ludwig Maximilian University of Munich, the HWA "Versuchsstelle" (testing station) in Gottow, the "Kaiser-Wilhelm-Institut für Chemie", the Physical Chemistry Department of the University of Hamburg, the Kaiser-Wilhelm-Institut für Physik", the Second Experimental Physics Institute at the Georg-August University of Göttingen, the Auergesellschaft, and the "II. Physikalisches Institut" at the University of Vienna. [ Hentschel and Hentschel, 1996; 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.] [ Macrakis, 1993, 164-169.] [ Walker, 1993, 49-53.] [ Kant, 2002, 19.]

Post WW II

From 1946, to 1957, in addition to his position at the KWImF, Both was an "ordentlicher Professor" (ordinarius professor) at the University of Heidelberg. [ Hentschel and Hentschel, 1996, Appendix F; see the entry for Bothe.] [ Mehra and Rechenberg, Volume 1, Part 2, 2001, pp. 608.]

At the end of World War II, the Allies had seized the cyclotron at Heidelberg. In 1949, its control was returned to Bothe. [ Hentschel and Hentschel, 1996, Appendix F; see the entry for Bothe.]

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-Liebnitz, Josef Mattauch, Wolfgang Riezler, Wilhelm Walcher, and Carl Friedrich von Weizsäcker. Wolfgang Paul was also a member of the group during 1957. [ Horst Kant "Werner Heisenberg and the German Uranium Project / Otto Hahn and the Declarations of Mainau and Göttingen", Preprint 203 (Max-Planck Institut für Wissenschaftsgeschichte, [http://www.mpiwg-berlin.mpg.de/Preprints/P203.PDF 2002] ).]

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. [ "Max Planck Institute for Nuclear Physics", " [http://www.innovations-report.com/html/profiles/profile-490.html Innovations Report] ".] [ Ulrich Schmidt-Rohr "Wolfgang Gentner: 1906-1980" ( [http://www.physik.uni-frankfurt.de/paf/paf181.html Universität Heidelberg] ).]

Bothe was a German patriot who did not give excuses for his work with the "Uranverein". However, Bothe’s impatience with National Socialists policies in Germany brought him under suspicion and investigation by the Gestapo. [ " [http://nobelprize.org/nobel_prizes/medicine/articles/states/walther-bothe.html Walther Bothe] and the Physics Institute: the Early Years of Nuclear Physics", Nobelprize.org.]

Personal

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. [ " [http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-bio.html Walther Bothe Biography] ", "The Nobel Prize in Physics 1954", Nobelprize.org.]

Bothe was an accomplished painter and musician; he played the piano. [ " [http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-bio.html Walther Bothe Biography] ", "The Nobel Prize in Physics 1954", Nobelprize.org.]

Honors

Bothe was awarded a number of honors: [ " [http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-bio.html Walther Bothe Biography] ", "The Nobel Prize in Physics 1954", Nobelprize.org.]

*Member of the Academy of Sciences of Göttingen

*Member of the Academy of Sciences of Heidelberg

*Corresponding Member of the Saxon Academy of Sciences, Leipzig

* Grand Cross of the Order for Federal Services

*1952 – Knight of the Order of Merit for Sciences and the Arts

*1953 – " Max-Planck-Medaille " of the "Deutsche Physikalische Gesellschaft"

*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. [ Hentschel and Hentschel, 1996, Appendix E; see the entry for "Kernphysikalische Forschungsberichte".] [ Walker, 1993, 268-274.]

*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 Maschinene 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 ["Präparat 38", "38-Oxyd", and "38" were the cover names for uranium oxide; see [http://www.deutsches-museum.de/archiv/archiv-online/geheimdokumente/forschungszentren/leipzig/schichtenanordnung-h2o/ Deutsches Museum] .] für thermische Neutronen aus Diffusionsmessungen" G-67 (20 January 1941)

*Walther Bothe and Arnold Flammersfeld "Resonanzeinfang an einer Uranberfläche" 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 Variationj der U- und D₂O-Dicken" G-206 (6 December 1943)

*Fritz Bopp, Walther Bothe, Erich Fischer, Erwin Fünfer, Werner Heisenberg, O. Ritter, and Karl Wirtz "Bericht über einen Versuch mit 1.5 to D₂O und U und 40 cm Kohlerückstreumantel (B7)" G-300 (3 January 1945)

elected 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 un 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 " [http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-lecture.html The Coincidence Method] ", "The Nobel Prize in Physics 1954", Nobelprize.org (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) ] [ 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, 393-395. FIAT: Field Information Agencies, Technical.]

*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)

Bibliography

*Beyerchen, Alan D. "Scientists Under Hitler: Politics and the Physics Community in the Third Reich" (Yale, 1977) ISBN 0-300-01830-4

*Walther Bothe " [http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-lecture.html The Coincidence Method] ", "The Nobel Prize in Physics 1954", Nobelprize.org (1954). Due to Bothe’s illness, this lecture was not delivered orally.
**" [http://nobelprize.org/nobel_prizes/medicine/articles/states/walther-bothe.html Walther Bothe] and the Physics Institute: the Early Years of Nuclear Physics", Nobelprize.org.
**" [http://nobelprize.org/nobel_prizes/physics/laureates/1954/bothe-bio.html Walther Bothe Biography] ", "The Nobel Prize in Physics 1954", Nobelprize.org.

*Hentschel, Klaus (editor) and Ann M. Hentschel (editorial assistant and translator) "Physics and National Socialism: An Anthology of Primary Sources" (Birkhäuser, 1996) ISBN 0-8176-5312-0. [This book is a collection of 121 primary German documents relating to physics under National Socialism. The documents have been translated and annotated, and there is a lengthy introduction to put them into perspective.]

*Kant, Horst "Werner Heisenberg and the German Uranium Project / Otto Hahn and the Declarations of Mainau and Göttingen", Preprint 203 (Max-Planck Institut für Wissenschaftsgeschichte, [http://www.mpiwg-berlin.mpg.de/Preprints/P203.PDF 2002] )

*Macrakis, Kristie "Surviving the Swastika: Scientific Research in Nazi Germany" (Oxrord, 1993)

*Mehra, Jagdish, and Helmut Rechenberg "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, 2001) ISBN 0-387-95175-X

*Mehra, Jagdish and Helmut Rechenberg "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, 2001) ISBN 978-0-387-95086-0

*Walker, Mark "German National Socialism and the Quest for Nuclear Power 1939–1949" (Cambridge, 1993) ISBN 0-521-43804-7

Notes