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Werner Heisenberg

Born Werner Karl Heisenberg
5 December 1901(1901-12-05)
Würzburg, Germany
Died 1 February 1976 (aged 74)
Munich, Germany
Nationality German
Fields Physics
Institutions University of Göttingen
University of Copenhagen
University of Leipzig
University of Berlin
University of St Andrews
University of Munich
Alma mater University of Munich
Doctoral advisor Arnold Sommerfeld
Other academic advisors Niels Bohr
Max Born
Doctoral students Felix Bloch
Edward Teller
Rudolph E. Peierls
Reinhard Oehme
Friedwardt Winterberg
Peter Mittelstaedt
Şerban Ţiţeica
Ivan Supek
Erich Bagge
Hermann Arthur Jahn
Raziuddin Siddiqui
Heimo Dolch
Hans Euler
Edwin Gora
Bernhard Kockel
Arnold Siegert
Wang Foh-san
Other notable students William Vermillion Houston
Guido Beck
Ugo Fano
Known for Uncertainty Principle
Heisenberg's microscope
Matrix mechanics
Kramers-Heisenberg formula
Heisenberg group
Isospin
Influenced Robert Döpel
Carl Friedrich von Weizsäcker
Notable awards Nobel Prize in Physics (1932)
Max Planck Medal (1933)
Notes
He was the father of the neurobiologist Martin Heisenberg and the son of August Heisenberg

Werner Heisenberg (5 December 1901 – 1 February 1976) was a German theoretical physicist who made foundational contributions to quantum mechanics and is best known for asserting the uncertainty principle of quantum theory. In addition, he made important contributions to nuclear physics, quantum field theory, and particle physics.

Heisenberg, along with Max Born and Pascual Jordan, set forth the matrix formulation of quantum mechanics in 1925. Heisenberg was awarded the 1932 Nobel Prize in Physics.

Following World War II, he was appointed director of the Kaiser Wilhelm Institute for Physics, which was soon thereafter renamed the Max Planck Institute for Physics. He was director of the institute until it was moved to Munich in 1958, when it was expanded and renamed the Max Planck Institute for Physics and Astrophysics.

Heisenberg was also president of the German Research Council, chairman of the Commission for Atomic Physics, chairman of the Nuclear Physics Working Group, and president of the Alexander von Humboldt Foundation.

Contents

Biography

Early years

Heisenberg was born in Würzburg, Germany to Kaspar Ernst August Heisenberg, a secondary school teacher of classical languages who became Germany's only ordentlicher Professor (ordinarius professor) of medieval and modern Greek studies in the university system and his wife Annie Wecklein.[1]

He studied physics and mathematics from 1920 to 1923 at the Ludwig-Maximilians-Universität München and the Georg-August-Universität Göttingen. At Munich, he studied under Arnold Sommerfeld and Wilhelm Wien. At Göttingen, he studied physics with Max Born and James Franck, and he studied mathematics with David Hilbert. He received his doctorate in 1923, at Munich under Sommerfeld. He completed his Habilitation in 1924, at Göttingen under Born.[2][3]

In his youth he was a member and Scoutleader of the Neupfadfinder, a German Scout association and part of the German Youth Movement.[4][5][6] In August 1923 Robert Honsell and Heisenberg organized a trip (Großfahrt) to Finland with a Scout group of this association from Munich.[7]

Because Sommerfeld had a sincere interest in his students and knew of Heisenberg's interest in Niels Bohr's theories on atomic physics, Sommerfeld took Heisenberg to Göttingen to the Bohr-Festspiele (Bohr Festival) in June 1922. At the event, Bohr was a guest lecturer and gave a series of comprehensive lectures on quantum atomic physics. There, Heisenberg met Bohr for the first time, and it had a significant and continuing effect on him.[8][9][10]

Heisenberg's doctoral thesis, the topic of which was suggested by Sommerfeld, was on turbulence;[11] the thesis discussed both the stability of laminar flow and the nature of turbulent flow. The problem of stability was investigated by the use of the Orr–Sommerfeld equation, a fourth order linear differential equation for small disturbances from laminar flow. He would briefly return to this topic after World War II.[12]

Heisenberg's paper on the anomalous Zeeman effect[13] was accepted as his Habilitationsschrift under Max Born at Göttingen.[14]

Career

Göttingen, Copenhagen, and Leipzig

From 1924 to 1927, Heisenberg was a Privatdozent at Göttingen. From 17 September 1924 to 1 May 1925, under an International Education Board Rockefeller Foundation fellowship, Heisenberg went to do research with Niels Bohr, director of the Institute of Theoretical Physics at the University of Copenhagen. He returned to Göttingen and with Max Born and Pascual Jordan, over a period of about six months, developed the matrix mechanics formulation of quantum mechanics. On 1 May 1926, Heisenberg began his appointment as a university lecturer and assistant to Bohr in Copenhagen. It was in Copenhagen, in 1927, that Heisenberg developed his uncertainty principle, while working on the mathematical foundations of quantum mechanics. In his paper[15] on the uncertainty principle, Heisenberg used the word "Ungenauigkeit" (imprecision).[2][16][17]

In 1927, Heisenberg was appointed ordentlicher Professor (ordinarius professor) of theoretical physics and head of the department of physics at the Universität Leipzig; he gave his inaugural lecture on 1 February 1928. In his first paper published from Leipzig,[18] Heisenberg used the Pauli exclusion principle to solve the mystery of ferromagnetism.[2][3][16][19]

In Heisenberg's tenure at Leipzig, the quality of doctoral students, post-graduate and research associates who studied and worked with Heisenberg there is attested to by the acclaim later earned by these personnel. At various times, these personnel included: Erich Bagge, Felix Bloch, Ugo Fano, Siegfried Flügge, William Vermillion Houston, Friedrich Hund, Robert S. Mulliken, Rudolf Peierls, George Placzek, Isidor Isaac Rabi, Fritz Sauter, John C. Slater, Edward Teller, John Hasbrouck van Vleck, Victor Frederick Weisskopf, Carl Friedrich von Weizsäcker, Gregor Wentzel, and Clarence Zener.[20]

In early 1929, Heisenberg and Wolfgang Pauli submitted the first of two papers[21][22] laying the foundation for relativistic quantum field theory. Also in 1929, Heisenberg went on a lecture tour in the United States, Japan, China, and India.[16][20]

Shortly after the discovery of the neutron by James Chadwick in 1932, Heisenberg submitted the first of three papers[23][24][25] on his neutron-proton model of the nucleus. He was awarded the 1932 Nobel Prize in Physics.[16][26]

In 1928, the British mathematical physicist P. A. M. Dirac had derived the relativistic wave equation of quantum mechanics, which implied the existence of positive electrons, later to be named positrons. In 1932, from a cloud chamber photograph of cosmic rays, the American physicist Carl David Anderson identified a track as having been made by a positron. In mid-1933, Heisenberg presented his theory of the positron. His thinking on Dirac's theory and further development of the theory were set forth in two papers. The first, Bemerkungen zur Diracschen Theorie des Positrons (Remarks on Dirac's theory of the positron) was published in 1934,[27] and the second, Folgerungen aus der Diracschen Theorie des Positrons (Consequences of Dirac's Theory of the Positron), was published in 1936.[16][28][29]

In the early 1930s in Germany, the deutsche Physik movement was anti-Semitic and anti-theoretical physics, especially including quantum mechanics and the theory of relativity. As applied in the university environment, political factors took priority over the historically applied concept of scholarly ability,[30] even though its two most prominent supporters were the Nobel Laureates in Physics Philipp Lenard[31] and Johannes Stark.[32]

After Adolf Hitler came to power in 1933, Heisenberg was attacked in the press as a "White Jew"[33] by elements of the deutsche Physik (German Physics) movement for his insistence on teaching about the roles of Jewish scientists. As a result, he came under investigation by the SS. This was over an attempt to appoint Heisenberg as successor to Arnold Sommerfeld at the University of Munich. The issue was resolved in 1938 by Heinrich Himmler, head of the SS. While Heisenberg was not chosen as Sommerfeld's successor, he was rehabilitated to the physics community during the Third Reich. Nevertheless, supporters of deutsche Physik launched vicious attacks against leading theoretical physicists, including Arnold Sommerfeld and Heisenberg. On 29 June 1936, a National Socialist Party newspaper published a column attacking Heisenberg. On 15 July 1937, he was attacked in a joural of the SS. This was the beginning of what is called the Heisenberg Affair.[16]

In mid-1936, Heisenberg presented his theory of cosmic-ray showers in two papers.[34][35] Four more papers[36][37][38][39] appeared in the next two years.[16][40]

In June 1939, Heisenberg bought a summer home for his family in Urfeld, in southern Germny. He also traveled to the United States in June and July, visiting Samuel Abraham Goudsmit, at the University of Michigan in Ann Arbor. However, Heisenberg refused an invitation to emigrate to the United States. He would not see Goudsmit again until six years later, when Goudsmit was the chief scientific advisor to the American Operation Alsos at the close of World War II. Irnonically, Heisenberg would be arrested under Operation Alsos and detained in England under Operation Epsilon.[16][41][42]

Matrix Mechanics and the Nobel Prize

Niels Bohr, Werner Heisenberg, and Wolfgang Pauli, ca. 1935

Heisenberg’s paper establishing quantum mechanics[43] has puzzled physicists and historians. His methods assume that the reader is familiar with Kramers-Heisenberg transition probability calculations. The main new idea, noncommuting matrices, is justified only by a rejection of unobservable quantities. It introduces the non-commutative multiplication of matrices by physical reasoning, based on the correspondence principle, despite the fact that Heisenberg was not then familiar with the mathematical theory of matrices. The path leading to these results has been reconstructed in MacKinnon, 1977,[44] and the detailed calculations are worked out in Aitchison et al.[45]

In Copenhagen Heisenberg and H. Kramers collaborated on a paper on dispersion, or the scattering from atoms of radiation whose wavelength is larger than the atoms. They showed that the successful formula Kramers had developed earlier could not be based on Bohr orbits, because the transition frequencies are based on level spacings which are not constant. The frequencies which occur in the Fourier transform of sharp classical orbits, by contrast, are equally spaced. But these results could be explained by a semi-classical Virtual State model: the incoming radiation excites the valence, or outer, electron to a virtual state from which it decays. In a subsequent paper Heisenberg showed that this virtual oscillator model could also explain the polarization of fluorescent radiation.

These two successes, and the continuing failure of the Bohr-Sommerfeld model to explain the outstanding problem of the anomalous Zeeman effect, led Heisenberg to use the virtual oscillator model to try to calculate spectral frequencies. The method proved too difficult to immediately apply to realistic problems, so Heisenberg turned to a simpler example, the anharmonic oscillator.

The dipole oscillator consists of a simple harmonic oscillator, which is thought of as a charged particle on a spring, perturbed by an external force, like an external charge. The motion of the oscillating charge can be expressed as a Fourier series in the frequency of the oscillator. Heisenberg solved for the quantum behavior by two different methods. First, he treated the system with the virtual oscillator method, calculating the transitions between the levels that would be produced by the external source.

He then solved the same problem by treating the anharmonic potential term as a perturbation to the harmonic oscillator and using the perturbation methods that he and Born had developed. Both methods led to the same results for the first and the very complicated second order correction terms. This suggested that behind the very complicated calculations lay a consistent scheme.

So Heisenberg set out to formulate these results without any explicit dependence on the virtual oscillator model. To do this, he replaced the Fourier expansions for the spatial coordinates by matrices, matrices which corresponded to the transition coefficients in the virtual oscillator method. He justified this replacement by an appeal to Bohr’s correspondence principle and the Pauli doctrine that quantum mechanics must be limited to observables.

On 9 July, Heisenberg gave Born this paper to review and submit for publication. When Born read the paper, he recognized the formulation as one which could be transcribed and extended to the systematic language of matrices,[46] which he had learned from his study under Jakob Rosanes[47] at Breslau University. Born, with the help of his assistant and former student Pascual Jordan, began immediately to make the transcription and extension, and they submitted their results for publication; the paper was received for publication just 60 days after Heisenberg's paper.[48] A follow-on paper was submitted for publication before the end of the year by all three authors.[49] (A brief review of Born's role in the development of the matrix mechanics formulation of quantum mechanics along with a discussion of the key formula involving the non-commutivity of the probability amplitudes can be found in an article by Jeremy Bernstein, Max Born and the Quantum Theory.[50] A detailed historical and technical account can be found in Mehra and Rechenberg's book The Historical Development of Quantum Theory. Volume 3. The Formulation of Matrix Mechanics and Its Modifications 1925–1926.[51])

Up until this time, matrices were seldom used by physicists; they were considered to belong to the realm of pure mathematics. Gustav Mie had used them in a paper on electrodynamics in 1912 and Born had used them in his work on the lattices theory of crystals in 1921. While matrices were used in these cases, the algebra of matrices with their multiplication did not enter the picture as they did in the matrix formulation of quantum mechanics.[52]

Born had learned matrix algebra from Rosanes, as already noted, but Born had also learned Hilbert's theory of integral equations and quadratic forms for an infinite number of variables as was apparent from a citation by Born of Hilbert's work Grundzüge einer allgemeinen Theorie der Linearen Integralgleichungen published in 1912.[53][54] Jordan, too was well equipped for the task. For a number of years, he had been an assistant to Richard Courant at Göttingen in the preparation of Courant and David Hilbert's book Methoden der mathematischen Physik I, which was published in 1924.[55] This book, fortuitously, contained a great many of the mathematical tools necessary for the continued development of quantum mechanics. In 1926, John von Neumann became assistant to David Hilbert, and he would coin the term Hilbert space to describe the algebra and analysis which were used in the development of quantum mechanics.[56][57]

In 1928, Albert Einstein nominated Heisenberg, Born, and Jordan for the Nobel Prize in Physics,[58] but it was not to be. The announcement of the Nobel Prize in Physics for 1932 was delayed until November 1933.[59] It was at that time that it was announced Heisenberg had won the Prize for 1932 "for the creation of quantum mechanics, the application of which has, inter alia, led to the discovery of the allotropic forms of hydrogen"[60][61] and Erwin Schrödinger and Paul Adrien Maurice Dirac shared the 1933 Prize "for the discovery of new productive forms of atomic theory".[61] One can rightly ask why Born was not awarded the Prize in 1932 along with Heisenberg – Bernstein gives some speculations on this matter. One of them is related to Jordan joining the Nazi Party on 1 May 1933 and becoming a Storm Trooper.[62] Hence, Jordan's Party affiliations and Jordan's links to Born may have affected Born's chance at the Prize at that time. Bernstein also notes that when Born won the Prize in 1954, Jordan was still alive, and the Prize was awarded for the statistical interpretation of quantum mechanics, attributable alone to Born.[63]

Heisenberg's reaction to Born for Heisenberg receiving the Prize for 1932 and to Born for Born receiving the Prize in 1954 are also instructive in evaluating whether Born should have shared the Prize with Heisenberg. On 25 November 1933, Born received a letter from Heisenberg in which he said he had been delayed in writing due to a "bad conscience" that he alone had received the Prize "for work done in Göttingen in collaboration – you, Jordan and I." Heisenberg went on to say that Born and Jordan's contribution to quantum mechanics cannot be changed by "a wrong decision from the outside."[64] In 1954, Heisenberg wrote an article honoring Max Planck for his insight in 1900. In the article, Heisenberg credited Born and Jordan for the final mathematical formulation of matrix mechanics and Heisenberg went on to stress how great their contributions were to quantum mechanics, which were not "adequately acknowledged in the public eye."[65]

The deutsche Physik movement

On 1 April 1935, the eminent theoretical physicist Arnold Sommerfeld, Heisenberg's doctoral advisor at the University of Munich, achieved emeritus status. However, Sommerfeld stayed in his chair during the selection process for his successor, which took until 1 December 1939. The process was lengthy due to academic and political differences between the Munich Faculty's selection and that of the Reichserziehungsministerium (REM, Reich Education Ministry.) and the supporters of Deutsche Physik, which was anti-Semitic and had a bias against theoretical physics, especially quantum mechanics and the theory of relativity. In 1935, the Munich Faculty drew up a list of candidates to replace Sommerfeld as ordinarius professor of theoretical physics and head of the Institute for Theoretical Physics at the University of Munich. There were three names on the list: Werner Heisenberg, who received the Nobel Prize in Physics for 1932, Peter Debye, who would receive the Nobel Prize in Chemistry in 1936, and Richard Becker - all former students of Sommerfeld. The Munich Faculty was firmly behind these candidates, with Heisenberg as their first choice. However, supporters of Deutsche Physik and elements in the REM had their own list of candidates and the battle dragged on for over four years. During this time, Heisenberg came under vicious attack by the Deutsche Physik supporters. One attack was published in Das Schwarze Korps, the newspaper of the Schutzstaffel (SS), headed by Heinrich Himmler. In this, Heisenberg was called a "White Jew" (i.e. an Aryan who acts like a Jew) who should be made to "disappear."[66] These attacks were taken seriously, as Jews were violently attacked and incarcerated. Heisenberg fought back with an editorial and a letter to Himmler, in an attempt to resolve this matter and regain his honour. At one point, Heisenberg's mother visited Himmler's mother. The two women knew each other as Heisenberg's maternal grandfather and Himmler's father were rectors and members of a Bavarian hiking club. Eventually, Himmler settled the Heisenberg affair by sending two letters, one to SS Gruppenführer Reinhard Heydrich and one to Heisenberg, both on 21 July 1938. In the letter to Heydrich, Himmler said Germany could not afford to lose or silence Heisenberg as he would be useful for teaching a generation of scientists. To Heisenberg, Himmler said the letter came on recommendation of his family and he cautioned Heisenberg to make a distinction between professional physics research results and the personal and political attitudes of the involved scientists. The letter to Heisenberg was signed under the closing "Mit freundlichem Gruss und, Heil Hitler!" (With friendly greetings, Heil Hitler!")[67] Overall, the Heisenberg affair was a victory for academic standards and professionalism. However, the appointment of Wilhelm Müller to replace Sommerfeld was a political victory over academic standards. Müller was not a theoretical physicist, had not published in a physics journal, and was not a member of the Deutsche Physikalische Gesellschaft; his appointment was considered a travesty and detrimental to educating theoretical physicists.[67][68][69][70][71]

During the SS investigation of Heisenberg, the three investigators had training in physics. Heisenberg had participated in the doctoral examination of one of them at the Universität Leipzig. The most influential of the three, however, was Johannes Juilfs. During their investigation, they had become supporters of Heisenberg as well as his position against the ideological policies of the deutsche Physik movement in theoretical physics and academia.[72]

World War II

In 1939, shortly after the discovery of nuclear fission, the German nuclear energy project, also known as the Uranverein (Uranium Club), was begun. Heisenberg was one of the principal scientists leading research and development in the project.[citation needed]

From 15 to 22 September 1941, Heisenberg traveled to German occupied Copenhagen to lecture and discuss nuclear research and theoretical physics with Niels Bohr. The meeting, and specifically what it might reveal about Heisenberg's intentions concerning developing nuclear weapons for the Nazi regime, is the subject of the award winning play titled Copenhagen. Documents relating to the Bohr-Heisenberg meeting were released in 2002 by the Niels Bohr Archive and by the Heisenberg family.[73][74]

On 26 February 1942, Heisenberg presented a lecture to Reich officials on energy acquisition from nuclear fission, after the Army withdrew most of its funding.[75] The Uranium Club was transferred to the Reich Research Council (RFR) in July 1942. On 4 June 1942, Heisenberg was summoned to report to Albert Speer, Germany's Minister of Armaments, on the prospects for converting the Uranium Club's research toward developing nuclear weapons. During the meeting, Heisenberg told Speer that a bomb could not be built before 1945, and would require significant monetary and manpower resources.[76] Five days later, on 9 June 1942, Adolf Hitler issued a decree for the reorganization of the RFR as a separate legal entity under the Reich Ministry for Armament and Ammunition; the decree appointed Reich Marshall Göring as the president.[77]

In September 1942, Heisenberg submitted his first paper of a three-part series on the scattering matrix, or S-matrix, in elementary particle physics. The first two papers were published in 1943[78][79] and the third in 1944.[80] The S-matrix described only observables, i.e., the states of incident particles in a collision process, the states of those emerging from the collision, and stable bound states; there would be no reference to the intervening states. This was the same precedent as he followed in 1925 in what turned out to be the foundation of the matrix formulation of quantum mechanics through only the use of observables.[16][40]

In February 1943, Heisenberg was appointed to the Chair for Theoretical Physics at the Friedrich-Wilhelms-Universität (today, the Humboldt-Universität zu Berlin). In April, his election to the Preußische Akademie der Wissenschaften (Prussian Academy of Sciences) was approved. That same month, he moved his family to their retreat in Urfeld as Allied bombing increased in Berlin. In the summer, he dispatched the first of his staff at the Kaiser-Wilhelm Institut für Physik to Hechingen and its neighboring town of Haigerloch, on the edge of the Black Forest, for the same reasons. From 18-26 October, he traveled to German occupied Netherlands. In December 1943, Heisenberg visited German occupied Poland.[16][81]

From 24 January to 4 February 1944, Heisenberg traveled to occupied Copenhagen, after the German Army confiscated Bohr's Institute of Theoretical Physics. He made a short return trip in April. In December, Heisenberg lectured in neutral Switzerland.[16]

In January 1945, Heisenberg vacated the Kaiser-Wilhelm Institut für Physik with about all of his staff for the facilities in the Black Forest.[16]

Uranium Club

In December 1938, the German chemists Otto Hahn and Fritz Strassmann sent a manuscript to Naturwissenschaften reporting they had detected the element barium after bombarding uranium with neutrons;[82] simultaneously, they communicated these results to Lise Meitner, who had in July of that year fled to the Netherlands and then went to Sweden.[83] Meitner, and her nephew Otto Robert Frisch, correctly interpreted these results as being nuclear fission.[84] Frisch confirmed this experimentally on 13 January 1939.[85][86]

Paul Harteck was director of the physical chemistry department at the University of Hamburg and an advisor to the Heereswaffenamt (HWA, Army Ordnance Office). On 24 April 1939, along with his teaching assistant Wilhelm Groth, Harteck made contact with the Reichskriegsministerium (RKM, Reich Ministry of War) to alert them to the potential of military applications of nuclear chain reactions. Two days earlier, on 22 April 1939, after hearing a colloquium paper by Wilhelm Hanle on the use of uranium fission in a Uranmaschine (uranium machine, i.e., nuclear reactor), Georg Joos, along with Hanle, notified Wilhelm Dames, at the Reichserziehungsministerium (REM, Reich Ministry of Education), of potential military applications of nuclear energy. The communication was given to Abraham Esau, head of the physics section of the Reichsforschungsrat (RFR, Reich Research Council) at the REM. On 29 April, a group, organized by Esau, met at the REM to discuss the potential of a sustained nuclear chain reaction. The group included the physicists Walther Bothe, Robert Döpel, Hans Geiger, Wolfgang Gentner (probably sent by Walther Bothe), Wilhelm Hanle, Gerhard Hoffmann, and Georg Joos; Peter Debye was invited, but he did not attend. After this, informal work began at the Georg-August University of Göttingen by Joos, Hanle, and their colleague Reinhold Mannfopff; the group of physicists was known informally as the first Uranverein (Uranium Club) and formally as Arbeitsgemeinschaft für Kernphysik. The group's work was discontinued in August 1939, when the three were called to military training.[87][88][89][90]

The second Uranverein began after the Heereswaffenamt (HWA, Army Ordnance Office) squeezed the Reichsforschungsrat (RFR, Reich Research Council) out of the Reichserziehungsministerium (REM, Reich Ministry of Education) and started the formal German nuclear energy project under military auspices. The second Uranverein was formed on 1 September 1939, the day World War II began, and it had its first meeting on 16 September 1939. 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. Also at this time, the Kaiser-Wilhelm Institut für Physik (KWIP, Kaiser Wilhelm Institute for Physics, after World War II the Max Planck Institute for Physics), in Berlin-Dahlem, was placed under HWA authority, with Diebner as the administrative director, and the military control of the nuclear research commenced.[89][90][91]

When it was apparent that the nuclear energy project would not make a decisive contribution to ending the war effort in the near term, control of the KWIP was returned in January 1942 to its umbrella organization, the Kaiser-Wilhelm Gesellschaft (KWG, Kaiser Wilhelm Society, after World War II the Max-Planck Gesellschaft), and HWA control of the project 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 a number of institutes, where the directors dominated the research and set their own research agendas.[89][92][93] The dominant personnel and facilities were the following:[94][95][96]

Heisenberg was appointed director-in-residence of the KWIP on 1 July 1942, as Peter Debye was still officially the director and on leave in the United States; Debye had gone on leave as he was a citizen of The Netherlands and had refused to become a German citizen when the HWA took administrative control of the KWIP. Heisenberg still also had his department of physics at the University of Leipzig where work was done for the Uranverein by Robert Döpel and his wife Klara Döpel. During the period Kurt Diebner administered the KWIP under the HWA program, considerable personal and professional animosity developed between Diebner and the Heisenberg inner circle – Heisenberg, Karl Wirtz, and Carl Friedrich von Weizsäcker.[16][97]

The point in 1942, when the army relinquished its control of the German nuclear energy project, was the zenith of the project relative to the number of personnel devoting time to the effort. There were only about seventy scientists working on the project, with about forty devoting more than half their time to nuclear fission research. After this, the number of scientists working on applied nuclear fission diminished dramatically. Many of the scientists not working with the main institutes stopped working on nuclear fission and devoted their efforts to more pressing war related work.[98]

Over time, the HWA and then the RFR controlled the German nuclear energy project. The most influential people in the project were Kurt Diebner, Abraham Esau, Walther Gerlach, and Erich Schumann. Schumann was one of the most powerful and influential physicists in Germany. Schumann was director of the Physics Department II at the Frederick William University (later, University of Berlin), which was commissioned and funded by the Oberkommando des Heeres (OKW, Army High Command) to conduct physics research projects. He was also head of the research department of the HWA, assistant secretary of the Science Department of the OKW, and Bevollmächtiger (plenipotentiary) for high explosives. Diebner, throughout the life of the nuclear energy project, had more control over nuclear fission research than did Walther Bothe, Klaus Clusius, Otto Hahn, Paul Harteck, or Werner Heisenberg.[99][100]

1945: Operation Alsos and Operation Epsilon

Operation Alsos was an Allied effort commanded by the Russian-American Colonel Boris T. Pash. He reported directly to General Leslie Groves, commander of the Manhattan Engineer District, which was developing atomic weapons for the United States. The chief scientific advisor to Operation Alsos was the physicist Samuel Abraham Goudsmit. Goudsmit was selected for this task because of his knowledge of physics, he spoke German, and he personally knew a number of the German scientists working on the German nuclear energy project. He also knew little of the Manhattan Project, so, if he were captured, he would have little intelligence value to the Germans. The objectives of Operation Alsos were to determine if the Germans had an atomic bomb program and to exploit German atomic related facilities, intellectual materials, materiel resources, and scientific personnel for the benefit of the United States. Personnel on this operation generally swept into areas which had just come under control of the Allied military forces, but sometimes they operated in areas still under control by German forces.[101][102][103]

Berlin had been a location of many German scientific research facilities. To limit casualties and loss of equipment, many of these facilities were dispersed to other locations in the latter years of the war. The Kaiser-Wilhelm-Institut für Physik (KWIP, Kaiser Wilhelm Institute for Physics) had mostly been moved in 1943 and 1944 to Hechingen and its neighboring town of Haigerloch, on the edge of the Black Forest, which eventually became the French occupation zone. This move and a little luck allowed the Americans to take into custody a large number of German scientists associated with nuclear research. The only section of the institute which remained in Berlin was the low-temperature physics section, headed by Ludwig Bewilogua (1906-83), who was in charge of the exponential uranium pile.[104][105]

Nine of the prominent German scientists who published reports in Kernphysikalische Forschungsberichte as members of the Uranverein[106] were picked up by Operation Alsos and incarcerated in England under Operation Epsilon: Erich Bagge, Kurt Diebner, Walther Gerlach, Otto Hahn, Paul Harteck, Werner Heisenberg, Horst Korsching, Carl Friedrich von Weizsäcker, and Karl Wirtz. Also, incarcerated was Max von Laue, although he had nothing to do with the nuclear energy project. Goudsmit, the chief scientific advisor to Operation Alsos, thought von Laue might be beneficial to the postwar rebuilding of Germany and would benefit from the high level contacts he would have in England.[107]

Heisenberg had been captured and arrested by Colonel Pash at Heisenberg's retreat in Urfeld, on 3 May 1945, in what was a true alpine-type operation in territory still under control by German forces. He was taken to Heidelberg, where, on 5 May, he met Goudsmit for the first time since the Ann Arbor visit in 1939. Germany surrendered just two days later. Heisenberg would not see his family again for eight months. Heisenberg was moved across France and Belgium and flown to England on 3 July 1945.[108][109][110]

The ten German scientists were held at Farm Hall in England. The facility had been a safe house of the British foreign intelligence MI6. During their detention, their conversations were recorded. Conversation thought to be of intelligence value were transcribed and translated into English. The transcripts were released in 1992. Bernstein has published an annotated version of the transcripts in his book Hitler's Uranium Club: The Secret Recordings at Farm Hall, along with an introduction to put them in perspective. A complete, unedited publication of the British version of the reports appeared as Operation Epsilon: The Farm Hall Transcripts, which was published in 1993 by the Institute of Physics in Bristol and by the University of California Press in the United States.[111][112][113]

Post 1945

On 3 January 1946, the ten Operation Epsilon detainees were transported to Alswede, Germany, which was in the British occupation zone. Heisenberg settled in Göttingen, also in the British zone. In July, he was named director of the Kaiser-Wilhelm Institut für Physik (KWIP, Kaiser Wilhelm Institute for Physics), then located in Göttingen. Shortly thereafter, it was renamed the Max-Planck Institut für Physik, in honor of Max Planck and to assuage political objections to the continuation of the institute. Heisenberg was its director until 1958. In 1958, the institute was moved to Munich, expanded, and renamed Max-Planck-Institut für Physik und Astrophysik (MPIFA). Heisenberg was its director from 1960 to 1970; in the interim, Heisenberg and the astrophysicist Ludwig Biermann were co-directors. Heisenberg resigned his directorship of the MPIFA on 31 December 1970. Upon the move to Munich, Heisenberg also became an ordentlicher Professor (ordinarius professor) at the University of Munich.[3][16]

Just as the Americans did with Operation Alsos, the Russians inserted special search teams into Germany and Austria in the wake of their troops. Their objective, under the Russian Alsos, was also the exploitation of German atomic related facilities, intellectual materials, materiel resources, and scientific personnel for the benefit of the Soviet Union. One of the German scientists recruited under this Russian operation was the nuclear physicist Heinz Pose, who was made head of Laboratory V in Obninsk. When he returned to Germany on a recruiting trip for his laboratory, Pose wrote a letter to the Werner Heisenberg inviting him to work in Russia. The letter lauded the working conditions in Russia and the available resources, as well as the favorable attitude of the Russians towards German scientists. A courier hand delivered the recruitment letter, dated 18 July 1946, to Heisenberg; Heisenberg politely declined in a return letter to Pose.[114][115]

In 1947, Heisenberg presented lectures in Cambridge, Edinburgh, and Bristol. Heisenberg also contributed to the understanding of the phenomenon of superconductivity with a paper in 1947[116] and two papers in 1948,[117][118] one of them with Max von Laue.[16] [119]

In the period shortly after World War II, Heisenberg briefly returned to the subject of his doctoral thesis, turbulence. Three papers were published in 1948[120][121][122] and one in 1950.[12][123]

In the post-war period, Heisenberg continued his interests in cosmic-ray showers with considerations on multiple production of mesons. He published three papers[124][125][126] in 1949, two[127][128] in 1952, and one[129] in 1955.[130]

On 9 March 1949, the Deutsche Forschungsrat (German Research Council) was established by the Max-Planck Gesellschaft (MPG, Max Planck Society, successor organization to the Kaiser-Wilhelm Gesellschaft. Heisenberg was appointed president of the Deutsche Forschungsrat. In 1951, the organization was fused with the Notgemeinschaft der Deutschen Wissenschaft (NG, Emergency Association of German Science) and that same year renamed the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation). With the merger, Heisenberg was appointed to the presidium.[16][131][132]

In 1952, Heisenberg served as the chairman of the Commission for Atomic Physics of the DFG. Also that year, he headed the German delegation to the European Council for Nuclear Research.[2][16]

In 1953, Heisenberg was appointed president of the Alexander von Humboldt-Stiftung by Konrad Adenauer. Heisenberg served until 1975. Also, from 1953, Heisenberg's theoretical work concentrated on the unified field theory of elementary particles.[2][3][16]

In late 1955 to early 1956, Heisenberg gave the Gifford Lectures at St Andrews University, in Scotland, on the intellectual history of physics. The lectures were later published as Physics and Philosophy: The Revolution in Modern Science.[133]

During 1956 and 1957, Heisenberg was the chairman 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: Walther Bothe, 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.[134]

In 1957, Heisenberg was a signatory of the manifesto of the Göttinger Achtzehn (Göttingen Eighteen).[135]

From 1957, Heisenberg was interested in plasma physics and the process of nuclear fusion. He also collaborated with the International Institute of Atomic Physics in Geneva. He was a member of the Institute's Scientific Policy Committee, and for several years was the Committee's chairman.[2]

In 1973, Heisenberg gave a lecture at Harvard University on the historical development of the concepts of quantum theory.[136]

On 24 March 1973, Heisenberg gave a speech before the Catholic Academy of Bavaria, accepting the Romano Guardini Prize. An English translation of its title is "Scientific and Religious Truth." And its stated goal was "In what follows, then, we shall first of all deal with the unassailability and value of scientific truth, and then with the much wider field of religion, of which--so far as the Christian religion is concerned--Guardini himself has so persuasively written; finally--and this will be the hardest part to formulate--we shall speak of the relationship of the two truths."[137] A more detail insight in Planck and Heisenberg on religion has been discussed by Wilfried Schröder in " Natural science and religion" (Bremen 1999, Science edition) and Wilfried Schröder " Naturerkenntnis und Religion" Bremen, science edition 2008).

Personal life

In January 1937 Heisenberg met Elisabeth Schumacher at a private music recital. Elisabeth was the daughter of a well-known Berlin economics professor. They were married on 29 April. The fraternal twins, Maria and Wolfgang, were born to them in January 1938, whereupon, Wolfgang Pauli congratulated Heisenberg on his "pair creation" – a word play on a process from elementary particle physics, pair production. They had five more children over the next 12 years: Barbara, Christine, Jochen, Martin, and Verena. Jochen became a physics professor at the University of New Hampshire.[138][139]

Heisenberg enjoyed classical music and was an accomplished pianist.[2]

Heisenberg died of cancer of the kidneys and gall bladder at his home, on 1 February 1976.[140] The next evening, his colleagues and friends walked in remembrance from the Institute of Physics to his home and each put a candle near the front door.[141]

Honours and awards

Heisenberg was awarded a number of honors:[2]

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.[142][143]

  • Robert Döpel, K. Döpel, and Werner Heisenberg Bestimmung der Diffusionslänge thermischer Neutronen in Präparat 38[144] G-22 (5 December 1940)
  • Robert Döpel, K. Döpel, and Werner Heisenberg Bestimmung der Diffusionslänge thermischer Neutronen in schwerem Wasser G-23 (7 August 1940)
  • Werner Heisenberg Die Möglichkeit der technischer Energiegewinnung aus der Uranspaltung G-39 (6 December 1939)
  • Werner Heisenberg Bericht über die Möglichkeit technischer Energiegewinnung aus der Uranspaltung (II) G-40 (29 February 1940)
  • Robert Döpel, K. Döpel, and Werner Heisenberg Versuche mit Schichtenanordnungen von D2O und 38 G-75 (28 October 1941)
  • Werner Heisenberg Über die Möglichkeit der Energieerzeugung mit Hilfe des Isotops 238 G-92 (1941)
  • Werner Heisenberg Bericht über Versuche mit Schichtenanordnungen von Präparat 38 und Paraffin am Kaiser Wilhelm Institut für Physik in Berlin-Dahlem G-93 (May 1941)
  • Fritz Bopp, Erich Fischer, Werner Heisenberg, Carl-Friedrich von Weizsäcker, and Karl Wirtz Untersuchungen mit neuen Schichtenanordnungen aus U-metall und Paraffin G-127 (March 1942)
  • Robert Döpel Bericht über Unfälle beim Umgang mit Uranmetall G-135 (9 July 1942)
  • Werner Heisenberg Bemerkungen zu dem geplanten halbtechnischen Versuch mit 1,5 to D2O und 3 to 38-Metall G-161 (31 July 1942)
  • Werner Heisenberg, Fritz Bopp, Erich Fischer, Carl-Friedrich von Weizsäcker, and Karl Wirtz Messungen an Schichtenanordnungen aus 38-Metall und Paraffin G-162 (30 October 1942)
  • Robert Döpel, K. Döpel, and Werner Heisenberg Der experimentelle Nachweis der effektiven Neutronenvermehrung in einem Kugel-Schichten-System aus D2O und Uran-Metall G-136 (July 1942)
  • Werner Heisenberg Die Energiegewinnung aus der Atomkernspaltung G-217 (6 May 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)
  • Robert Döpel, K. Döpel, and Werner Heisenberg Die Neutronenvermehrung in einem D2O-38-Metallschichtensystem G-373 (March 1942)

Publications

Collected bibliographies
  • Cassidy, David C. Werner Heisenberg : A Bibliography of His Writings, Second, Expanded Edition (Whittier, 2001)
  • Cassidy, David Werner Heisenberg: A Bibliography of His Writings, 1922-1929, Expanded Edition HTML Version PDF Version
  • Mott, N. and R. Peierls Werner Heisenberg, Biographical Memoirs of Fellows of the Royal Society Volume 23, 213-251 (1977)
  • Anna Ludovico, Effetto Heisenberg. La rivoluzione scientifica che ha cambiato la storia, Roma: Armando 2001, p. 224 ISBN: 8883581822.
  • Barbara Blum, Helmut Heisenberg, Anna Ludovico, Per Heisenberg, Roma: Aracne 2006, p. 96 ISBN: 8854806366
Selected articles
  • A. Sommerfeld and W. Heisenberg Eine Bemerkung über relativistische Röntgendubletts und Linienschärfe, Z. Phys. Volume 10, 393-398 (1922)
  • A. Sommerfeld and W. Heisenberg Die Intensität der Mehrfachlinien und ihrer Zeeman-Komponenten, Z. Phys. Volume 11, 131-154 (1922)
  • M. Born and W. Heisenberg Über Phasenbeziehungen bei den Bohrschen Modellen von Atomen und Molekeln, Z. Phys. Volume 14, 44-55 (1923)
  • M. Born and W. Heisenberg Die Elektronenbahnen im angeregten Heliumatom, Z. Phys. Volume 16, 229-243 (1923)
  • M. Born and W. Heisenberg Zur Quantentheorie der Molekeln, Ann. d. Physik Volume 74, Number 4, 1-31 (1924)
  • W. Heisenberg Über Stabilität und Turbulenz von Flüssigkeitsströmmen (Diss.), Ann. Physik Volume 74, Number 4, 577-627 (1924)
  • M. Born and W. Heisenberg Über den Einfluss der Deformierbarekit der Ionen auf optische und chemische Konstanten. I., Z. Phys. Volume 23, 388-410 (1924)
  • W. Heisenberg Über eine Abänderung der formalin Regeln der Quantentheorie beim Problem der anomalen Zeeman-Effekte, Z. Phys. Volume 26, 291-307 (1924)
  • W. Heisenberg, Über quantentheoretische Umdeutung kinematischer und mechanischer Beziehungen, Zeitschrift für Physik, 33, 879-893 (1925). The paper was received on 29 July 1925. [English translation in: B. L. van der Waerden, editor, Sources of Quantum Mechanics (Dover Publications, 1968) ISBN 0-486-61881-1 (English title: Quantum-Theoretical Re-interpretation of Kinematic and Mechanical Relations).] This is the first paper in the famous trilogy which launched the matrix mechanics formulation of quantum mechanics.
  • M. Born and P. Jordan, Zur Quantenmechanik, Zeitschrift für Physik, 34, 858-888 (1925). The paper was received on 27 September 1925. [English translation in: B. L. van der Waerden, editor, Sources of Quantum Mechanics (Dover Publications, 1968) ISBN 0-486-61881-1 (English title: On Quantum Mechanics).] This is the second paper in the famous trilogy which launched the matrix mechanics formulation of quantum mechanics.
  • M. Born, W. Heisenberg, and P. Jordan, Zur Quantenmechanik II, Zeitschrift für Physik, 35, 557-615 (1925). The paper was received on 16 November 1925. [English translation in: B. L. van der Waerden, editor, Sources of Quantum Mechanics (Dover Publications, 1968) ISBN 0-486-61881-1] This is the third paper in the famous trilogy which launched the matrix mechanics formulation of quantum mechanics.
  • W. Heisenberg Über den anschulichen Inhalt der quantentheoretischen Kinematik und Mechanik, Z. Phys. Volume 43, 172-198 (1927)
  • W. Heisenberg Zur Theorie des Ferromagnetismus, Z. Phys. Volume 49, 619-636 (1928)
  • W. Heisenberg and W. Pauli Zur Quantentheorie der Wellenfelder, Z. Phys. Volume 56, 1-61 (1929)
  • W. Heisenberg and W. Pauli Zur Quantentheorie der Wellenfelder. II., Z. Phys. Volume 59, 168-190 (1930)
  • W. Heisenberg Über den Bau der Atomkerne. I., Z. Phys. Volume 77, 1-11 (1932)
  • W. Heisenberg Über den Bau der Atomkerne. II., Z. Phys. Volume 78, 156-164 (1932)
  • W. Heisenberg Über den Bau der Atomkerne. III., Z. Phys. Volume 80, 587-596 (1933)
  • Werner Heisenberg Bemerkungen zur Diracschen Theorie des Positrons, Zeitschrift für Physik Volume 90, Numbers 3-4, 209-231 (1934). The author was cited as being at Leipzig. The paper was received on 21 June 1934.
  • W. Heisenberg Über die ‘Schauer’ in der Kosmischen Strahlung, Forsch. Fortscher. Volume 12, 341-342 (1936)
  • W. Heisenberg and H. Euler Folgerungen aus der Diracschen Theorie des Positrons, Zeitschr. Phys. Volume 98, Numbers 11-12, 714-732 (1936). The authors were cited as being at Leipzig. The paper was received on 22 December 1935. A translation of this paper has been done by W. Korolevski and H. Kleinert: arXiv:physics/0605038v1.
  • W. Heisenberg Zur Theorie der ‘Schauer’ in der Höhenstrahlung, Z. Phys. Volume 101, 533-540 (1936)
  • W. Heisenberg Der Durchgang sehr energiereicher Korpuskeln durch den Atomkern, Ber. Sächs, Akad. Wiss. Volume 89, 369; Die Naturwissenschaften Volume 25, 749-750 (1937)
  • W. Heisenberg Theoretische Untersuchungen zur Ultrastrahlung, Verh. Stsch. physical. Ges. Volume 18, 50 (1937)
  • W. Heisenberg Die Absorption der durchdringenden Komponente der Höhenstrahlung, Ann. Phys. Volume 33, 594-599 (1938)
  • W. Heisenberg Der Durchgang sehr energiereicher Korpuskeln durch den Atomkern, Nuovo Cimento Volume 15, 31-34; Verh. Dtsch. physik. Ges. Volume 19, 2 (1938)
  • W. Heisenberg Die beobachtbaren Grössen in der Theorie der Elementarteilchen. I., Z. Phys. Volumne 120, 513-538 (1943)
  • W. Heisenberg Die beobachtbaren Grössen in der Theorie der Elementarteilchen. II., Z. Phys. Volumne 120, 673-702 (1943)
  • W. Heisenberg Die beobachtbaren Grössen in der Theorie der Elementarteilchen. III., Z. Phys. Volumne 123, 93-112 (1944)
  • W. Heisenberg Zur Theorie der Supraleitung, Forsch. Fortschr. Volumes 21/23, 243-244 (1947); Z. Naturf. Volume 2a, 185-201 (1947)
  • W. Heisenberg Das elektrodynamische Verhalten der Supraleiter, Z. Naturf. Volume 3a, 65-75 (1948)
  • M. von Laue and W. Heisenberg Das Barlowsche Rad aus supraleitendem Material, Z. Phys. Volume 124, 514-518 (1948)
  • W. Heisenberg Zur statistischen Theorie der Turbulenz, Z. Phys. Volume 124, 628-657 (1948)
  • W. Heisenberg On the theory of statistical and isotropic turbulence, Proc. R. Soc. London A Volume 195, 402-406 (1948)
  • W. Heisenberg Bemerkungen um Turbulenzproblem, Z. Naturf. Volume 3a, 434-437 (1948)
  • W. Heisenberg Production of mesons showers, Nature, Lond. Volume 164, 65-67 (1949)
  • W. Heisenberg Die Erzeugung von Mesonen in Vielfachprozessen, Nuovo Cimento Volume 6 (Supplement), 493-497 (1949)
  • W. Heisenberg Über die Entstehung von Mesonen in Vielfachprozessen, Z. Phys. Volume 126, 569-582 (1949)
  • W. Heisenberg On the stability of laminar flow, Proc. International Congress Mathematicians Volume II, 292-296 (1950)
  • W. Heisenberg Bermerkungen zur Theorie der Vielfacherzeugung von Mesonen, Die Naturwissenschaften Volume 39, 69 (1952)
  • W. Heisenberg Mesonenerzeugung als Stosswellenproblem, Z. Phys. Volume 133, 65-79 (1952)
  • W, Heisenberg The production of mesons in very high energy collisions, Nuovo Cimento Volume 12, Supplement, 96-103 (1955)
  • Werner Heisenberg Development of concepts in the history of quantum theory, American Journal of Physics Volume 43, Number 5, 389-394 (1975). The substance of this article was presented by Heisenberg in a lecture at Harvard University.

Books

  • Werner Heisenberg, Carl Eckart (translator), and F.C. Hoyt (translator) The Physical Principles of the Quantum Theory (Dover, 1930)
  • Werner Heisenberg Philosophic problems of nuclear science (Fawcett, 1966)
  • Werner Heisenberg Physics and Beyond: Encounters and Conversations (Harper & Row, 1971)
  • Werner Heisenberg and Jürgen Busche Quantentheorie und Philosophie: Vorlesungen und Aufsätze (Reclam, 1979)
  • Werner Heisenberg Philosophical Problems of Quantum Physics (Ox Bow, 1979)
  • Werner Heisenberg Physik und Philosophie: Weltperspektiven. (Ullstein Taschenbuchvlg., 1988)
  • Werner Heisenberg Encounters with Einstein (Princeton University, 1989)
  • Werner Heisenberg and F. S. C. Northrop Physics and Philosophy: The Revolution in Modern Science (Great Minds Series) (Prometheus, 1999)
  • Werner Heisenberg Der Teil und das Ganze: Gespräche im Umkreis der Atomphysik (Piper, 2001)
  • Werner Heisenberg Deutsche und Jüdische Physik (Piper, 2002)
  • Werner Heisenberg Physik und Philosophie (Hirzel, 2007)
  • Werner Heisenberg Physics and Philosophy: The Revolution in Modern Science (Harper Perennial Modern Classics, 2007) (full text of 1958 version)

Notes

  1. ^ Cassidy, Uncertainty, 1992, 3.
  2. ^ a b c d e f g h Werner Heisenberg Biography, Nobel Prize in Physics 1932 Nobelprize.org.
  3. ^ a b c d Hentschel and Hentschel, 1996, Appendix F; see the entry for Heisenberg.
  4. ^ Maringer, Daniel (in German), Berühmte Physiker: Werner Heisenberg eine Biographie-Pfadfinderzeit, http://www.physik.tu-berlin.de/~dschm/lect/heislek/html/pfadfinder.html, retrieved 2009-02-05 
  5. ^ (in German) Heisenberg Werner, http://www.psfd.de/de/datenbank_mitmacher/einleitung.php,67,Heisenberg-Werner, retrieved 2009-02-05 
  6. ^ "Ein Leben für die Jugendbewegung und Jugendseelsorger-100 Jahre Gottfried Simmerding" (in German). Rundbrief der Regionen Donau und München (Gemeinschaft Katholischer Männer und Frauen im Bund Neudeutschland-ND) 2/2005: 12. March 2005. http://www.kmf-net.de/files/muenchen/Maerz2005.pdf. 
  7. ^ Helmut Raum (2008). "Die Pfadfinderbewegung im Freistaat Bayern Teil 53" (in German). Der Bundschuh (Pfadfinderförderkreis Nordbayern e.V.) 2/2008: 23–24. http://www.bdp-foerder-nord.de/Der%20Bundschuh%202.%20Quartal.pdf. 
  8. ^ Cassidy, Uncertainty, 1992, 127 and Appendix A.
  9. ^ Powers, 1993, 23.
  10. ^ van der Waerden, 1968, 21.
  11. ^ W. Heisenberg Über Stabilität und Turbulenz von Flüssigkeitsströmmen (Diss.), Ann. Physik Volume 74, Number 4, 577-627 (1924), as cited in Mott and Peierls, 1977, 245.
  12. ^ a b Mott and Peierls, 1977, 217.
  13. ^ W. Heisenberg Über eine Abänderung der formalin Regeln der Quantentheorie beim Problem der anomalen Zeeman-Effekte, Z. Phys. Volume 26, 291-307 (1924), as cited in Mott and Peierls, 1977, 243.
  14. ^ Mott and Peierls, 1977, 219.
  15. ^ W. Heisenberg Über den anschulichen Inhalt der quantentheoretischen Kinematik und Mechanik, Z. Phys. Volume 43, 172-198 (1927), cited in Mott and Peierls, 1977, 243.
  16. ^ a b c d e f g h i j k l m n o p q r Cassidy, Uncertainty, 1992, Appendix A.
  17. ^ Mott and Peierls, 1977, 224.
  18. ^ W. Heisenberg Zur Theorie des Ferromagnetismus, Z. Phys. Volume 49, 619-636 (1928), as cited in Mott and Peierls, 1977, 243.
  19. ^ Mott and Peierls, 1977, 226-227.
  20. ^ a b Mott and Peierls, 1977, 227.
  21. ^ W. Heisenberg and W. Pauli Zur Quantentheorie der Wellenfelder, Z. Phys. Volume 56, 1-61 (1929), as cited in Mott and Peierls, 1977, 243.
  22. ^ W. Heisenberg and W. Pauli Zur Quantentheorie der Wellenfelder. II., Z. Phys. Volume 59, 168-190 (1930), as cited in Mott and Peierls, 1977, 243.
  23. ^ W. Heisenberg Über den Bau der Atomkerne. I., Z. Phys. Volume 77, 1-11 (1932), as cited by Mott and Peierls, 1977, 244.
  24. ^ W. Heisenberg Über den Bau der Atomkerne. II., Z. Phys. Volume 78, 156-164 (1932), as cited by Mott and Peierls, 1977, 244.
  25. ^ W. Heisenberg Über den Bau der Atomkerne. III., Z. Phys. Volume 80, 587-596 (1933), as cited by Mott and Peierls, 1977, 244.
  26. ^ Mott and Peierls, 1977, 228.
  27. ^ Werner Heisenberg Bemerkungen zur Diracschen Theorie des Positrons, Zeitschrift für Physik Volume 90, Numbers 3-4, 209-231 (1934).
  28. ^ W. Heisenberg and H. Euler Folgerungen aus der Diracschen Theorie des Positrons, Zeitschr. Phys. Volume 98, Numbers 11-12, 714-732 (1936). A translation of this paper has been done by W. Korolevski and H. Kleinert: arXiv:physics/0605038v1.
  29. ^ Emilio Segrè From X-rays to Quarks: Modern Physicists and Their Discoveries (Freeman, 1980, paperback editions).
  30. ^ Beyerchen, 1997, 141-167.
  31. ^ Beyerchen, 1977, 79-102.
  32. ^ Beyerchen, 1977, 103-140.
  33. ^ http://www.aip.org/history/heisenberg/p10.htm.
  34. ^ W. Heisenberg Über die ‘Schauer’ in der Kosmischen Strahlung, Forsch. Fortscher. Volume 12, 341-342 (1936), as cited by Mott and Peierls, 1977, 244.
  35. ^ W. Heisenberg Zur Theorie der ‘Schauer’ in der Höhenstrahlung, Z. Phys. Volume 101, 533-540 (1936), as cited by Mott and Peierls, 1977, 244.
  36. ^ W. Heisenberg Der Durchgang sehr energiereicher Korpuskeln durch den Atomkern, Ber. Sächs, Akad. Wiss. Volume 89, 369; Die Naturwissenschaften Volume 25, 749-750 (1937), as cited by Mott and Peierls, 1977, 244.
  37. ^ W. Heisenberg Theoretische Untersuchungen zur Ultrastrahlung, Verh. Stsch. physical. Ges. Volume 18, 50 (1937), as cited by Mott and Peierls, 1977, 244.
  38. ^ W. Heisenberg Die Absorption der durchdringenden Komponente der Höhenstrahlung, Ann. Phys. Volume 33, 594-599 (1938), as cited by Mott and Peierls, 1977, 244.
  39. ^ W. Heisenberg Der Durchgang sehr energiereicher Korpuskeln durch den Atomkern, Nuovo Cimento Volume 15, 31-34; Verh. Dtsch. physik. Ges. Volume 19, 2 (1938), as cited by Mott and Peierls, 1977, 244.
  40. ^ a b Mott and Peierls, 1977, 231.
  41. ^ Hentschel and Hentschel, 1996, 387 and 387n20.
  42. ^ Goudsmit, Alsos, 1986, picture facing p. 124.
  43. ^ W. Heisenberg, Über quantentheoretishe Umdeutung kinematisher und mechanischer Beziehungen, Zeitschrift für Physik, 33, 879-893, 1925 (received 29 July 1925). [English translation in: B. L. van der Waerden, editor, Sources of Quantum Mechanics (Dover Publications, 1968) ISBN 0-486-61881-1 (English title: "Quantum-Theoretical Re-interpretation of Kinematic and Mechanical Relations").]
  44. ^ MacKinnon, Edward, "Heisenberg, Models, and the Rise of Quantum Mechanics", Historical Studies in the Physical Sciences, Volume 8, 137-188 (1977)
  45. ^ Aitchison, Ian J. R., David A. MacManus and Thomas M. Snyder (November 2004), Understanding Heisenberg’s ‘magical’ paper of July 1925: A new look at the calculational details, American Journal of Physics 72(11), 1370-1379 doi:10.1119/1.1775243 arXiv:quant-ph/0404009v1
  46. ^ Abraham Pais, Niels Bohr's Times in Physics, Philosophy, and Polity (Clarendon Press, 1991) ISBN 0-19-852049-2, pp 275 - 279.
  47. ^ Max Born The Statistical Interpretation of Quantum Mechanics, Nobel Lecture (1954)
  48. ^ M. Born and P. Jordan, Zur Quantenmechanik, Zeitschrift für Physik, 34, 858-888, 1925 (received 27 September 1925). [English translation in: B. L. van der Waerden, editor, Sources of Quantum Mechanics (Dover Publications, 1968) ISBN 0-486-61881-1]
  49. ^ M. Born, W. Heisenberg, and P. Jordan, Zur Quantenmechanik II, Zeitschrift für Physik, 35, 557-615, 1925 (received 16 November 1925). [English translation in: B. L. van der Waerden, editor, Sources of Quantum Mechanics (Dover Publications, 1968) ISBN 0-486-61881-1]
  50. ^ Jeremy Bernstein Max Born and the Quantum Theory, Am. J. Phys. 73 (11) 999-1008 (2005)
  51. ^ Mehra, Volume 3 (Springer, 2001)
  52. ^ Jammer, 1966, pp. 206-207.
  53. ^ van der Waerden, 1968, p. 51.
  54. ^ The citation by Born was in Born and Jordan's paper, the second paper in the trilogy which launched the matrix mechanics formulation. See van der Waerden, 1968, p. 351.
  55. ^ Constance Reid Courant (Springer, 1996) p. 93.
  56. ^ John von Neumann Allgemeine Eigenwerttheorie Hermitescher Funktionaloperatoren, Mathematische Annalen 102 49–131 (1929)
  57. ^ When von Neumann left Göttingen in 1932, his book on the mathematical foundations of quantum mechanics, based on Hilbert's mathematics, was published under the title Mathematische Grundlagen der Quantenmechanik. See: Norman Macrae, John von Neumann: The Scientific Genius Who Pioneered the Modern Computer, Game Theory, Nuclear Deterrence, and Much More (Reprinted by the American Mathematical Society, 1999) and Constance Reid, Hilbert (Springer-Verlag, 1996) ISBN 0-387-94674-8.
  58. ^ Bernstein, 2004, p. 1004.
  59. ^ Greenspan, 2005, p. 190.
  60. ^ a b http://nobelprize.org/nobel_prizes/physics/laureates/1932/
  61. ^ a b Nobel Prize in Physics and 1933 – Nobel Prize Presentation Speech.
  62. ^ Bernstein, 2005, p. 1004.
  63. ^ Bernstein, 2005, p. 1006.
  64. ^ Greenspan, 2005, p. 191.
  65. ^ Greenspan, 2005, pp. 285-286.
  66. ^ Klaus Hentschel (Editor) and Ann M. Hentschel (Editorial Assistant and Translator) Physics and National Socialism: An Anthology of Primary Sources (Birkhäuser, 1996). In this book, see: Document #55 ’White Jews’ in Science [15 July 1937] pp. 152-157.
  67. ^ a b Goudsmit, Samuel A. ALSOS (Tomash Publishers, 1986) pp 117 -119.
  68. ^ Beyerchen, 1977, 153-167.
  69. ^ Cassidy, 1992, 383-387.
  70. ^ Powers, 1993, 40–43.
  71. ^ Klaus Hentschel (Editor) and Ann M. Hentschel (Editorial Assistant and Translator) Physics and National Socialism: An Anthology of Primary Sources (Birkhäuser, 1996). In this book, see: Document #55 ’White Jews’ in Science [15 July 1937] pp. 152-157; Document #63 Heinrich Himmler: Letter to Reinhard Heydrich [21 July 1938] pp. 175-176; Document #64 Heinrich Himmler: Letter to Werner Heisenberg [21 July 1938] pp. 176-177; Document #85 Ludwig Prandtl: Attachment to the letter to Reich Marschal (sic) Hermann Göring [28 April 1941] pp. 261-266; and Document #93 Carl Ramsauer: The Munich Conciliation and Pacification Attempt [20 January 1942] pp. 290-292.
  72. ^ Cassidy, 1992, 390-391. Please note that Cassidy uses the alias Mathias Jules for Johannes Juilfs.
  73. ^ Niels Bohr Archive. His site contains historical background and facsimiles of documents relating to the 1941 Bohr-Heisenberg meeting.
  74. ^ . Heisenberg September 1941 Letter
  75. ^ American Institute for Physics, Center for History of Physics.
  76. ^ Albert Speer, Inside the Third Reich, Macmillan, 1970, pp. 225ff. See also http://www.stanford.edu/~njenkins/cgi-bin/auden/individual.php?pid=I662&ged=auden-bicknell.ged
  77. ^ Document 98: The Führer's Decree on the Reich Research Council, 9 June 1942, in Hentschel, 1996, 303.
  78. ^ W. Heisenberg Die beobachtbaren Grössen in der Theorie der Elementarteilchen. I., Z. Phys. Volume 120, 513-538 (1943), as cited in Mott and Peierls, 1977, 245.
  79. ^ W. Heisenberg Die beobachtbaren Grössen in der Theorie der Elementarteilchen. II., Z. Phys. Volume 120, 673-702 (1943), as cited in Mott and Peierls, 1977, 245.
  80. ^ W. Heisenberg Die beobachtbaren Grössen in der Theorie der Elementarteilchen. III., Z. Phys. Volume 123, 93-112 (1944), as cited in Mott and Peierls, 1977, 245.
  81. ^ Jeremy Bernstein Heisenberg in Poland, Am. J. Phys. Volume 72, Number 3, 300-304 (2004). See also Letters to the Editor by Klaus Gottstein and a reply by Jeremy Bernstein in Am. J. Phys. Volume 72, Number 9, 1143-1145 (2004).
  82. ^ 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.
  83. ^ Ruth Lewin Sime Lise Meitner's Escape from Germany, American Journal of Physics Volume 58, Number 3, 263- 267 (1990).
  84. ^ 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.
  85. ^ 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).]
  86. ^ In 1944, Hahn received the Nobel Prize for Chemistry for the discovery of nuclear fission. Some historians have documented the history of the discovery of nuclear fission and believe Meitner should have been awarded the Nobel Prize with Hahn. See the following references: 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); Ruth Lewin Sime Lise Meitner: A Life in Physics (University of California, 1997); and Elisabeth Crawford, Ruth Lewin Sime, and Mark Walker A Nobel Tale of Postwar Injustice, Physics Today Volume 50, Issue 9, 26-32 (1997).
  87. ^ Kant, 2002, Reference 8 on p. 3.
  88. ^ Hentschel and Hentschel, 1996, 363-364 and Appendix F; see the entries for Esau, Harteck and Joos. See also the entry for the KWIP in Appendix A and the entry for the HWA in Appendix B.
  89. ^ a b c Macrakis, 1993, 164-169.
  90. ^ a b Mehra and Rechenberg, Volume 6, Part 2, 2001, 1010-1011.
  91. ^ Hentschel and Hentschel, 1996, 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.
  92. ^ 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.
  93. ^ Walker, 1993, 49-53.
  94. ^ Walker, 1993, 52-53.
  95. ^ Kant, 2002, 19.
  96. ^ Deutsches Museum - Tätigkeitsbericht des II. Physikalischen Instituts der Wiener Universität, 1945
  97. ^ Walker, 1993, 19 and 94-95.
  98. ^ Walker, 1993, 52 and Reference #40 on p. 262.
  99. ^ Walker, 1993, 208.
  100. ^ Hentschel and Hentschel, 1996, Appendix F; see the entry for Schumann. Also see footnote #1 on p. 207.
  101. ^ Goudsmit, Samuel with an introduction by R. V. Jones Alsos (Toamsh, 1986).
  102. ^ Pash, Boris T. The Alsos Mission (Award, 1969).
  103. ^ Cassidy, Uncertainty, 1992, 491-500.
  104. ^ Naimark, 1995, 208-209.
  105. ^ Bernstein, 2001, 49-52.
  106. ^ Walker, 1993, 268-274 and Reference #40 on p. 262.
  107. ^ Bernstein, 2001, 50 and 363-365.
  108. ^ Cassidy, Uncertainty, 1992, 491-510.
  109. ^ Bernstein, 2001, 60.
  110. ^ Pash, Boris T. The Alsos Mission (Award, 1969) pp. 219-241.
  111. ^ Charles Franck Operation Epsilon: The Farm Hall Transcripts (University of California Press, 1993)
  112. ^ Jeremy Bernstein Hitler's Uranium Club: The Secret Recording's at Farm Hall (Copernicus, 2001) ISBN 0-387-95089-3.
  113. ^ Bernstein, 2001, xvii-xix.
  114. ^ Walker, 1993, 184-185.
  115. ^ Oleynikov, 2000, 14.
  116. ^ W. Heisenberg Zur Theorie der Supraleitung, Forsch. Fortschr. Volumes 21/23, 243-244 (1947); Z. Naturf. Volume 2a, 185-201 (1947), cited in Mott and Peierls, 1977, 245.
  117. ^ W. Heisenberg Das elektrodynamische Verhalten der Supraleiter, Z. Naturf. Volume 3a, 65-75 (1948), cited in Mott and Peierls, 1977, 245.
  118. ^ M. von Laue and W. Heisenberg Das Barlowsche Rad aus supraleitendem Material, Z. Phys. Volume 124, 514-518 (1948), cited in Mott and Peierls, 1977, 245.
  119. ^ Mott and Peierls, 1977, 238-239.
  120. ^ W. Heisenberg Zur statistischen Theorie der Tubulenz, Z. Phys. Volume 124, 628-657 (1948), as cited in Mott and Peierls, 1977, 245.
  121. ^ W. Heisenberg On the theory of statistical and isotropic turbulence, Proc. R. Soc. London A Volume 195, 402-406 (1948), as cited in Mott and Peierls, 1977, 245.
  122. ^ W. Heisenberg Bemerkungen um Turbulenzproblem, Z. Naturf. Volume 3a, 434-437 (1948), as cited in Mott and Peierls, 1977, 245.
  123. ^ W. Heisenberg On the stability of laminar flow, Proc. International Congress Mathematicians Volume II, 292-296 (1950), as cited in Mott and Peierls, 1977, 245.
  124. ^ W. Heisenberg Production of mesons showers, Nature, Lond. Volume 164, 65-67 (1949), as cited in Mott and Peierls, 1977, 245.
  125. ^ W. Heisenberg Die Erzeugung von Mesonen in Vielfachprozessen, Nuovo Cimento Volume 6 (Supplement), 493-497 (1949) as cited in Mott and Peierls, 1977, 245.
  126. ^ W. Heisenberg Über die Entstehung von Mesonen in Vielfachprozessen, Z. Phys. Volume 126, 569-582 (1949), as cited in Mott and Peierls, 1977, 245.
  127. ^ W. Heisenberg Bermerkungen zur Theorie der Vielfacherzeugung von Mesonen, Die Naturwissenschaften Volume 39, 69 (1952), as cited in Mott and Peierls, 1977, 246.
  128. ^ W. Heisenberg Mesonenerzeugung als Stosswellenproblem, Z. Phys. Volume 133, 65-79 (1952), as cited in Mott and Peierls, 1977, 246.
  129. ^ W, Heisenberg The production of mesons in very high energy collisions, Nuovo Cimento Volume 12, Supplement, 96-103 (1955), as cited in Mott and Peierls, 1977, 246.
  130. ^ Mott and Peierls, 1977, 238.
  131. ^ Hentschel, 1996, Appendix A; see the entries for DFG and NG.
  132. ^ J. L. Heilbron The Dilemmas of an Upright Man: Max Planck and the Fortunes of German Science (Harvard, 2000) pp. 90-92.
  133. ^ Cassidy, Uncertainty, 1992, 262.
  134. ^ 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, 2002).
  135. ^ Declaration of the German Nuclear Physicists ArmsControl.de.
  136. ^ Werner Heisenberg Development of concepts in the history of quantum theory, American Journal of Physics Volume 43, Number 5, 389-394. The substance of this article was presented by Heisenberg in a lecture at Harvard University.
  137. ^ a b Chapter 16 "Scientific and Religious Truth" in Across the Frontiers, 1974, Harper & Row, p.213-229
  138. ^ Cassidy, Uncertainty, 1992, 372 and Appendix A.
  139. ^ David Cassidy and the American Institute of Physics, The Difficult Years.
  140. ^ Cassidy, Uncertainty, 1992, 262, 545.
  141. ^ Cassidy, Uncertainty, 1992, 545.
  142. ^ Hentschel and Hentschel, 1996, Appendix E; see the entry for Kernphysikalische Forschungsberichte.
  143. ^ Walker, 1993, 268-274.
  144. ^ Präparat 38 was the cover name for uranium oxide; see Deutsches Museum.

References

  • Bernstein, Jeremy and David Cassidy Bomb Apologetics: Farm Hall, August 1945, Physics Today Volume 48, Issue 8, Part I, 32-36 (1995)
  • Bernstein, Jeremy Hitler's Uranium Club: The Secret Recording's at Farm Hall (Copernicus, 2001) ISBN 0-387-95089-3
  • Bernstein, Jeremy Heisenberg and the critical mass, Am. J. Phys. Volume 70, Number 9, 911-916 (2002)
  • Bernstein, Jeremy Heisenberg in Poland, Am. J. Phys. Volume 72, Number 3, 300-304 (2004). See also Letters to the Editor by Klaus Gottstein and a reply by Jeremy Bernstein in Am. J. Phys. Volume 72, Number 9, 1143-1145 (2004).
  • Bernstein, Jeremy Max Born and the Quantum Theory, Am. J. Phys. 73 (11) 999-1008 (2005). Department of Physics, Stevens Institute of Technology, Hoboken, New Jersey 07030. Received 14 April 2005; accepted 29 July 2005.
  • Bethe, Hans A. The German Uranium Project, Physics Today Volume 53, Issue 7, 34-36
  • Beyerchen, Alan D. Scientists Under Hitler: Politics and the Physics Community in the Third Reich (Yale, 1977) ISBN 0-300-01830-4
  • Cassidy, David C. Heisenberg, German Science, and the Third Reich, Social Research Volume 59, Number 3, 643-661 (1992)
  • Cassidy, David C. Uncertainty: The Life and Science of Werner Heisenberg (Freeman, 1992)
  • Cassidy, David C. A Historical Perspective on Copenhagen, Physics Today Volume 53, Issue 7, 28 (2000). See also Heisenberg's Message to Bohr: Who Knows, Physics Today Volume 54, Issue 4, 14ff (2001), individual letters by Klaus Gottstein, Harry J. Lipkin, Donald C. Sachs, and David C. Cassidy.
  • Chevalley, Catherine Werner Heisenberg: Philosophie le Manuscrit de 1942 (Éditions du Seuil, 1998)
  • Eckert, Michael Primacy doomed to failure: Heisenberg’s role as scientific adviser for nuclear policy in the FRG, Historical Studies in the Physical and Biological Sciences Volume 21, Number 1, 29 – 58 (1990)
  • Eckert, Michael Werner Heisenberg: controversial scientist physicsweb.org (2001)
  • Goudsmit, Samuel with an introduction by R. V. Jones Alsos (Toamsh, 1986)
  • Fedak, William A. and Jeffrey J. Prentis The 1925 Born and Jordan paper “On quantum mechanics”, American Journal of Physics Volume 77, Number 2, pp. 128 – 139 (2009)
  • Greenspan, Nancy Thorndike "The End of the Certain World: The Life and Science of Max Born" (Basic Books, 2005) ISBN 0-7382-0693-8. Also published in Germany: Max Born — Baumeister der Quantenwelt. Eine Biographie (Spektrum Akademischer Verlag, 2005), ISBN 3-8274-1640-X.
  • Heisenberg, Werner Nobel Prize Presentation Speech, Nobelprize.org (1933)
  • Heisenberg, Elisabeth Inner Exile: Recollections of a Life with Heisenberg (Birkhäuser, 1984)
  • Heisenberg, Werner Physics and Beyond: Encounters and Conversations (Harper & Row, 1971)
  • Heisenberg, Werner Die theoretischen Grundlagen für die Energiegewinnung aus der Uranspaltung, Zeitschrift für die gesamte Natruwiessenschaft, Volume 9, 201-212 (1943). See also the annotated English translation: Document 95. Werner Heisenberg. The Theoretical Basis for the Generation of Energy from Uranium Fission [26 February 1942] in Hentschel, Klaus (editor) and Ann M. Hentschel (editorial assistant and translator) Physics and National Socialism: An Anthology of Primary Sources (Birkhäuser, 1996) 294-301.
  • Heisenberg, Werner Research in Germany on the Technical Applications of Atomic Energy, Nature Volume 160, Number 4059, 211-215 (16 August 1947). See also the annotated English translation: Document 115. Werner Heisenberg: Research in Germany on the Technical Application of Atomic Energy [16 August 1947] in Hentschel, Klaus (editor) and Ann M. Hentschel (editorial assistant and translator) Physics and National Socialism: An Anthology of Primary Sources (Birkhäuser, 1996) 361-379.
  • Heisenberg, Werner, introduction by David Cassidy, translation by William Sweet A Lecture on Bomb Physics: February 1942, Physics Today Volume 48, Issue 8, Part I, 27-30 (1995)
  • 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.]
  • Hentschel, Klaus The Metal Aftermath: The Mentality of German Physicists 1945-1949 (Oxford, 2007)
  • Hoffmann, Dieter Between Autonomy and Accommodation: The German Physical Society during the Third Reich, Physics in Perspective 7(3) 293-329 (2005)
  • Jammer, Max The Conceptual Development of Quantum Mechanics (McGraw-Hill, 1966)
  • Junk, Robert Brighter Than a Thousand Suns: A personal history of the atomic scientists (Harcourt, Brace, 1958)
  • 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, 2002)
  • Landsman, N. P. Getting even with Heisenberg, Studies in History and Philosophy of Modern Physics Volume 33, 297-325 (2002)
  • MacKinnon, Edward, “Heisenberg, Models, and the Rise of Quantum Mechanics”, Historical Studies in the Physical Sciences, Volume 8, 137-188 (1977)
  • Macrakis, Kristie Surviving the Swastika: Scientific Research in Nazi Germany (Oxford, 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 3. The Formulation of Matrix Mechanics and Its Modifications 1925–1926. (Springer, 2001) ISBN 0-387-95177-6
  • 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
  • Mott, N. and R. Peierls Werner Heisenberg, Biographical Memoirs of Fellows of the Royal Society Volume 23, 213-251 (1977)
  • Norman M. Naimark The Russians in Germany: A History of the Soviet Zone of Occupation, 1945-1949 (Belkanp, 1995)
  • Oleynikov, Pavel V. German Scientists in the Soviet Atomic Project, The Nonproliferation Review Volume 7, Number 2, 1–30 (2000). The author has been a group leader at the Institute of Technical Physics of the Russian Federal Nuclear Center in Snezhinsk (Chelyabinsk-70).
  • Pash, Boris T. The Alsos Mission (Award, 1969)
  • Powers, Thomas Heisenberg's War: The Secret History of the German Bomb (Knopf, 1993)
  • Rose, Paul Lawrence, Heisenberg and the Nazi Atomic Bomb Project: A Study in German Culture (California, 1998). For a critical review of this book, please see: Landsman, N. P. Getting even with Heisenberg, Studies in History and Philosophy of Modern Physics Volume 33, 297-325 (2002).
  • Todorv, Ivan Werner Heisenberg (2003)
  • van der Waerden, B. L., editor, Sources of Quantum Mechanics (Dover Publications, 1968) ISBN 0-486-61881-1
  • Walker, Mark Heisenberg, Goudsmit and the German Atomic Bomb, Physics Today Volume 43, Issue 1, 52-60 (1990)
  • Walker, Mark Physics and propaganda: Werner Heisenberg's foreign lectures under National Socialism, Historical Studies in the Physical Sciences Volume 22, 339-389 (1992)
  • Walker, Mark German National Socialism and the Quest for Nuclear Power 1939–1949 (Cambridge, 1993) ISBN 0-521-43804-7
  • Walker, Mark Eine Waffenschmiede? Kernwaffen- und Reaktorforschung am Kaiser-Wilhelm-Institut für Physik, Forschungsprogramm "Geschichte der Kaiser-Wilhelm-Gesellschaft im Nationalsozialismus" Ergebnisse 26 (2005)

Further reading

  • Born, Max The statistical interpretation of quantum mechanics. Nobel Lecture – 11 December 1954.
  • Cassidy, David C. Werner Heisenberg : A Bibliography of His Writings, Second, Expanded Edition (Whittier, 2001)
  • Dörries, Matthias Michael Frayn's ‘Copenhagen’ in Debate: Historical Essays and Documents on the 1941 Meeting Between Niels Bohr and Werner Heisenberg (University of California, 2005)
  • Fischer, Ernst P. Werner Heisenberg: Das selbstvergessene Genie (Piper, 2002)
  • Heisenberg, Werner "A Scientist's case for the Classics" (Harper's Magazine, May 1958, p. 25-29)
  • Heisenberg, Werner Across the Frontiers (Harper & Row, 1974)
  • Kleint, Christian and Gerald Wiemer Werner Heisenberg im Spiegel seiner Leipziger Schüler und Kollegen (Leipziger Universitätsverlag, 2005)
  • Papenfuß, Dietrich, Dieter Lüst, and Wolfgang P. Schleich 100 Years Werner Heisenberg: Works and Impact (Wiley-VCH, 2002)
  • Rechenberg, Helmut und Gerald Wiemers Werner Heisenberg (1901-1976), Schritte in die neue Physik (Sax-Verlag Beucha, 2001)
  • Schiemann, Gregor Werner Heisenberg (C.H. Beck, 2008)
  • von Weizsäcker, Carl Friedrich and Bartel Leendert van der Waerden Werner Heisenberg (Hanser, Carl GmbH, 1977)
  • Rhodes, Richard The Making of the Atomic Bomb (Simon and Schuster, 1986)
  • Walker, Mark National Socialism and German Physics, Journal of Contemporary Physics Volume 24, 63-89 (1989)
  • Walker, Mark Nazi Science: Myth, Truth, and the German Atomic Bomb (Perseus, 1995)
  • Walker, Mark German Work on Nuclear Weapons, Historia Scientiarum; International Journal for the History of Science Society of Japan, Volume 14, Number 3, 164-181 (2005)

External links


Quotes

Up to date as of January 14, 2010

From Wikiquote

We have to remember that what we observe is not nature herself, but nature exposed to our method of questioning.

Werner Karl Heisenberg (5 December 19011 February 1976) was a German physicist, Nobel laureate, and one of the founders of the field of quantum mechanics.

Contents

Sourced

It has been possible to invent a mathematical scheme... which seems entirely adequate for the treatment of atomic processes; for visualisation, however, we must content ourselves with two incomplete analogies — the wave picture and the corpuscular picture.
  • The more precise the measurement of position, the more imprecise the measurement of momentum, and vice versa.
  • Light and matter are both single entities, and the apparent duality arises in the limitations of our language. It is not surprising that our language should be incapable of describing the processes occurring within the atoms, for, as has been remarked, it was invented to describe the experiences of daily life, and these consist only of processes involving exceedingly large numbers of atoms. Furthermore, it is very difficult to modify our language so that it will be able to describe these atomic processes, for words can only describe things of which we can form mental pictures, and this ability, too, is a result of daily experience. Fortunately, mathematics is not subject to this limitation, and it has been possible to invent a mathematical scheme — the quantum theory — which seems entirely adequate for the treatment of atomic processes; for visualisation, however, we must content ourselves with two incomplete analogies — the wave picture and the corpuscular picture.
    • "Introductory" in The Physical Principles of the Quantum Theory (1930) as translated by Carl Eckhart and Frank C. Hoyt, p. 10
There is a fundamental error in separating the parts from the whole, the mistake of atomizing what should not be atomized. Unity and complementarity constitute reality.
  • Every experiment destroys some of the knowledge of the system which was obtained by previous experiments.
    • "Critique of the Physical Concepts of the Corpuscular Theory" in The Physical Principles of the Quantum Theory (1930) as translated by Carl Eckhart and Frank C. Hoyt, p. 20; also in "The Uncertainty Principle" in The World of Mathematics : A Small Library of the Literature of Mathematics (1956) by James Roy Newman, p. 1051
  • An expert is someone who knows some of the worst mistakes that can be made in his subject, and how to avoid them.
    • Physics and Beyond : Encounters and Conversation (1971)
  • Quantum theory provides us with a striking illustration of the fact that we can fully understand a connection though we can only speak of it in images and parables.
    • Physics and Beyond : Encounters and Conversation (1971)
  • In general, scientific progress calls for no more than the absorption and elaboration of new ideas— and this is a call most scientists are happy to heed.
    • Physics and Beyond : Encounters and Conversation (1971)
  • There is a fundamental error in separating the parts from the whole, the mistake of atomizing what should not be atomized. Unity and complementarity constitute reality.
    • As quoted in Physics from Wholeness : Dynamical Totality as a Conceptual Foundation for Physical Theories (2005) by Barbara Piechocinska
The smallest units of matter are not physical objects in the ordinary sense; they are forms, ideas which can be expressed unambiguously only in mathematical language.
  • After these conversations with Tagore some of the ideas that had seemed so crazy suddenly made much more sense. That was a great help for me.
    • On conversations with Rabindranath Tagore, as quoted in Uncommon Wisdom: Conversations With Remarkable People (1988) by Fritjof Capra, who states that after these "He began to see that the recognition of relativity, interconnectedness, and impermanence as fundamental aspects of physical reality, which had been so difficult for himself and his fellow physicists, was the very basis of the Indian spiritual traditions."
    • Variant: After the conversations about Indian philosophy, some of the ideas of Quantum Physics that had seemed so crazy suddenly made much more sense.
      • As quoted in Pride of India (2006) by Samskrita Bharati. p. 56
  • I think that modern physics has definitely decided in favor of Plato. In fact the smallest units of matter are not physical objects in the ordinary sense; they are forms, ideas which can be expressed unambiguously only in mathematical language.
    • As quoted in The New York Times Book Review (8 March 1992)

The Development of Quantum Mechanics (1933)

Nobel lecture (11 December 1933) Full text online (PDF)
The ultimate shape owes its genesis partly to an element of chance which in principle cannot be analysed further
  • The interest of research workers has frequently been focused on the phenomenon of regularly shaped crystals suddenly forming from a liquid, e.g. a supersaturated salt solution. According to the atomic theory the forming force in this process is to a certain extent the symmetry characteristic of the solution to Schrödinger's wave equation, and to that extent crystallization is explained by the atomic theory. Nevertheless this process retains a statistical and — one might almost say — historical element which cannot be further reduced: even when the state of the liquid is completely known before crystallization, the shape of the crystal is not determined by the laws of quantum mechanics. The formation of regular shapes is just far more probable than that of a shapeless lump. But the ultimate shape owes its genesis partly to an element of chance which in principle cannot be analysed further.
  • However the development proceeds in detail, the path so far traced by the quantum theory indicates that an understanding of those still unclarified features of atomic physics can only be acquired by foregoing visualization and objectification to an extent greater than that customary hitherto. We have probably no reason to regret this, because the thought of the great epistemological difficulties with which the visual atom concept of earlier physics had to contend gives us the hope that the abstracter atomic physics developing at present will one day fit more harmoniously into the great edifice of Science.

Physics and Philosophy (1958)

Physics and Philosophy: The Revolution in Modern Science (1958) Lectures delivered at University of St. Andrews, Scotland, Winter 1955-56
The existing scientific concepts cover always only a very limited part of reality, and the other part that has not yet been understood is infinite.
  • We have to remember that what we observe is not nature herself, but nature exposed to our method of questioning.
    • This has also appeared in the alternate form: "What we observe is not nature itself, but nature exposed to our method of questioning."
Whenever we proceed from the known into the unknown we may hope to understand, but we may have to learn at the same time a new meaning of the word "understanding."
  • In the philosophy of Democritus the atoms are eternal and indestructible units of matter, they can never be transformed into each other. With regard to this question modern physics takes a definite stand against the materialism of Democritus and for Plato and the Pythagoreans. The elementary particles are certainly not eternal and indestructible units of matter, they can actually be transformed into each other. As a matter of fact, if two such particles, moving through space with a very high kinetic energy, collide, then many new elementary particles may be created from the available energy and the old particles may have disappeared in the collision. Such events have been frequently observed and offer the best proof that all particles are made of the same substance: energy. But the resemblance of the modern views to those of Plato and the Pythagoreans can be carried somewhat further. The elementary particles in Plato's Timaeus are finally not substance but mathematical forms. "All things are numbers" is a sentence attributed to Pythagoras. The only mathematical forms available at that time were such geometric forms as the regular solids or the triangles which form their surface. In modern quantum theory there can be no doubt that the elementary particles will finally also be mathematical forms but of a much more complicated nature. The Greek philosophers thought of static forms and found them in the regular solids. Modern science, however, has from its beginning in the sixteenth and seventeenth centuries started from the dynamic problem. The constant element in physics since Newton is not a configuration or a geometrical form, but a dynamic law. The equation of motion holds at all times, it is in this sense eternal, whereas the geometrical forms, like the orbits, are changing. Therefore, the mathematical forms that represent the elementary particles will be solutions of some eternal law of motion for matter. This is a problem which has not yet been solved.
  • The existing scientific concepts cover always only a very limited part of reality, and the other part that has not yet been understood is infinite.
  • Whenever we proceed from the known into the unknown we may hope to understand, but we may have to learn at the same time a new meaning of the word "understanding."
Any concepts or words which have been formed in the past through the interplay between the world and ourselves are not really sharply defined with respect to their meaning: that is to say, we do not know exactly how far they will help us in finding our way in the world.
  • The physicist may be satisfied when he has the mathematical scheme and knows how to use for the interpretation of the experiments. But he has to speak about his results also to non-physicists who will not be satisfied unless some explanation is given in plain language. Even for the physicist the description in plain language will be the criterion of the degree of understanding that has been reached.
  • I remember discussions with Bohr which went through many hours till very late at night an ended almost in despair; and when at the end of the discussion I went alone for a walk in the neighbouring park I repeated to myself again and again the question: Can nature possibly be so absurd as it seemed to us in these atomic experiments?
  • Any concepts or words which have been formed in the past through the interplay between the world and ourselves are not really sharply defined with respect to their meaning: that is to say, we do not know exactly how far they will help us in finding our way in the world. We often know that they can be applied to a wide range of inner or outer experience, but we practically never know precisely the limits of their applicability. This is true even of the simplest and most general concepts like "existence" and "space and time". Therefore, it will never be possible by pure reason to arrive at some absolute truth.
    The concepts may, however, be sharply defined with regard to their connections... a group of connected concepts may be applicable to a wide field of experience and will help us to find our way in this field. But the limits of the applicability will in general not be known, at least not completely...

Misattributed

  • Some subjects are so serious that one can only joke about them.
    • Sometimes attributed to Heisenberg, this was actually a statement made by Niels Bohr, as quoted in The Genius of Science: A Portrait Gallery (2000) by Abraham Pais, p. 24
    • Some things are so serious that one can only joke about them.
      • Variant without any citation as to author in Denial is not a river in Egypt (1998) by Sandi Bachom, p. 85.

External links

Wikipedia
Wikipedia has an article about:

Simple English

File:Werner Heisenberg at 1927 Solvay
Werner Heisenberg as a young man.

Werner Karl Heisenberg (December 5, 1901 - February 1, 1976) was a German physicist, Nobel Prize winner and one of the people who started a new area of physics called quantum mechanics. Most people think that he is one of the most important scientists of the 20th century. He is also well-known for discovering the Heisenberg uncertainty principle, which explains that there is a limit on how well some things can be measured.

Heisenberg was born in Wuerzburg Germany, the son of a professor of history of Byzantium. He went to university to study physics in Munich. Arnold Sommerfeld was one of his teachers.

Heisenberg was a very good student and needed only three years to finish his studies. He then wrote a doctoral thesis about movements in the flows of liquids ("Über Stabilität und Turbulenz von Flüssigkeitsströmen"). In 1924 he became assistant to Max Born at the University of Göttingen and in 1926 worked with Niels Bohr at the University of Copenhagen.

Together with Born and Pascal Jordan he founded Quantum mechanics. At the age of 26 Heisenberg became professor of theoretical physics at the University of Leipzig. This was a very young age for such a job.

In 1932 Heisenberg won the Nobel Prize for physics, for his work in quantum mechanics. Again this was very young, he was only 31 years old.

In 1937 he married Elisabeth Schumacher. They had seven children, one of their sons is well known as a neurobiologist and geneticist, Martin Heisenberg.

During the Second World War, from 1942 to 1945 Werner Heisenberg was head of German atomic research work. This did not result in any working nuclear weapons, possibly because Heisenberg did not want it to. This is not a sure thing. Some people have said that Heisenberg was very much against the Nazis. Some people have said that he must have been for them, because he worked for them.

After the war, he was held as a prisoner at Farm Hall in England from May 1945 to January, 1946, where the British and Americans had many other German scientists.

Later he worked in nuclear research, mainly in West Germany, but he was against nuclear weapons.

He died in Munich Germany, in 1976 at the age of 74.

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