What If Werner Heisenberg Had Been a Nazi? | HistoryNet MENU

What If Werner Heisenberg Had Been a Nazi?

By Mark Grimsley
1/30/2012 • Battle Films

Today the name Werner Heisenberg means little, even to highly educated people. But on the eve of World War II, he was a Nobel laureate with a reputation as possibly the world’s greatest atomic physicist. So when the community of physicists realized that an atomic bomb was theoretically possible, they also felt certain that if anyone on Earth could actually figure out how to construct such a weapon of mass destruction, it was Werner Heisenberg.

For that reason, as the Nazi regime inexorably nudged Europe toward war, Heisenberg’s British and American peers within the physics community encouraged him to emigrate. They knew that Heisenberg quietly disapproved of Nazism. But as he explained to those who urged him to defect, he remained a German nationalist. And if war broke out, Heisenberg would honor his duty to the fatherland.

Sure enough, in 1939 Heisenberg joined the Uranverein (Uranium Club), which took its name from the fact that the isotope U-235 offered the best prospect for achieving nuclear fission, the basis of an atomic bomb. The fundamental challenge, however, was that U-235 constituted just 0.7 percent of natural uranium, and would have to be extracted from hundreds of tons of uranium ore.

Nazi Germany, as the Allies well knew, had all the requisite materials to achieve a nuclear weapon, including ample uranium from Czechoslovakia. But the specter that haunted the Manhattan Project, the Anglo-American effort to build an atomic bomb, was the knowledge that Nazi Germany also had Heisenberg, who had quickly become the de facto leader of the Uranverein, a role roughly equivalent to that of J. Robert Oppenheimer, the American physicist who masterminded the Manhattan Project. Fear of Heisenberg drove that frantic project all the more fiercely.

In my last column, I examined a scenario that could have emerged if Germany had developed an atomic bomb. But as the Allies discovered to their amazement when the war ended, Germany never came close to developing the bomb. Why not?

Some have pointed to the organization of the Nazi regime, a Balkanized mess of competing bureaucracies, deliberately fragmented to maximize Hitler’s power because it made him the sole arbiter of all major disputes. And truly, such was the regime that Heisenberg served. Its built-in inefficiency hobbled the creation of a German Manhattan Project. Yet resolute scientists sometimes overcame this inefficiency, as Werner von Braun did in persuading the regime to pour resources into the development of ballistic missiles. Why didn’t Heisenberg emulate that example?

Heisenberg actually seemed to do just the opposite: he downplayed the likelihood of creating the bomb. His report on the prospects for an A-bomb was a sleep-inducing marvel of bland obfuscation. When Albert Speer, Germany’s minister of armaments, asked Heisenberg point blank if a bomb were feasible, he declared that “the technical prerequisites for production” would take at least two years to develop, “even if the program was given maximum support.”

Heisenberg did not mean that it would take at least two years to develop a bomb; he meant that it would take at least two years to develop the large cyclotrons required to extract enough U-235. When Speer objected that surely his ministry had the means to construct such cyclotrons, Heisenberg replied that German physicists lacked experience with cyclotrons. They would first have to experiment with a small cyclotron. Confronted with this appraisal, Speer abandoned all thought of resourcing a major nuclear weapons program.

After the war, Heisenberg claimed that he and other nuclear scientists had deliberately misled the Nazi government because “the idea of putting an atomic bomb in Hitler’s hand was horrible.” Luckily, “we [physicists] had a wonderful excuse, we could always say: ‘Please, it is quite certain that what we are doing cannot result in an atomic bomb for three or four years.’?” Moreover, he said that German physicists had channeled research away from weapons and toward work on a small-scale reactor that never came close to producing a nuclear reaction.

A number of writers have taken Heisenberg at his word, most notably journalist Thomas Powers in his best-selling book, Heisenberg’s War (1993). “Germany’s failure to build an atomic bomb was not inevitable,” Powers wrote. “If a serious effort to develop a bomb had commenced in mid-1940, one might have been tested in 1943.” Heisenberg’s deliberate lack of zeal to push through the Nazi bureaucracy “was lethal, like a poison that leaves no trace,” Powers insisted. “Heisenberg did not simply withhold himself, stand aside, let the project die. He killed it.”
By this logic, if Heisenberg had been a Nazi, Germany might well have obtained the bomb, and done so years before the Allies. But few close students of Germany’s atomic program believe this.

The smoking gun, so to speak, lies embedded in transcripts of discussions with Heisenberg that took place in the summer and fall of 1945, when he was interned at an English manor called Farm Hall. The discussions center on the Hiroshima bomb. To the non-specialist perusing these transcripts, Heisenberg seems to know what he’s talking about. But to the specialist, Heisenberg’s ignorance of what was required to produce an atomic bomb is jaw-droppingly evident. The transcripts for August 6, the date of the Hiroshima explosion, reveal a nuclear physicist utterly innocent of knowledge of the physics of nuclear fission as applied to an atomic bomb. It further reveals that Heisenberg estimated the amount of U-235 in the Hiroshima bomb at 900 kilograms (the actual amount was just 56 kilograms), and his arithmetic was so sloppy that had he done the calculation correctly, the estimate would have been a whopping 11,700 kilograms!

Within a few days, as more information about the Hiroshima bomb became available, Heisenberg backtracked to align his calculations with reality, and did this so artfully that his mastery of physics appeared complete. But it was smoke and mirrors. Thus, from the Farm Hall transcripts, the reason behind Germany’s failure to achieve an atomic bomb becomes evident. It wasn’t that Heisenberg could not abide Nazism. It was that he could not fathom what it took to create a bomb. Heisenberg the genius proved not genius enough.

16 Responses to What If Werner Heisenberg Had Been a Nazi?

  1. Tom Holzel says:

    When you examine the size and scope of the U.S. atomic bomb effort, you realize that even if Heisenberg had been successful in devising how to make A-bombs, there is no way tiny Germany could have afforded the manufacturing effort–which was Herculean, even by U.S. standards.

    I detail this in a spy thriller novel (Ballard’s War) in which the hero–a time traveler from the 1990s, goes back to help the Germans win the war–by getting them to bomb (with improved V-1s launched by U-boats off the coast of Georgia) the Oak Ridge nuclear plants.

    • Simon Gunson says:

      I would stick with writing novels if I were you. The size and scope of the US Atomic bomb effort were dictated largely by inefficiency.

      The porous barrier K-25 plant at Oak Ridge was so inefficient that it only enriched U235 in a given mass of Uranium from 0.72% up to 0.86% from a single pass. (“Nuclear Forensic Analysis” Pub 2005 by CRC Press, Kenton J. Moody, Ian D. Hutcheon, Patrick M. Grant p.94)

      US archives show that by March 1945 Oak Ridge had only enriched 15kg of Uranium.

      In contrast by 1944 the Nazis developed not one, but three different designs of Uranium centrifuges. The best known of these, the Anschutz Mark IIIB produced 7% enrichment of 250 grams per day. The hellage factory at Freiberg manufactured at least 100 of these machines, with production commencing in April 1944. 40 of these Mark IIIB were installed at an underground complex in Kandern. Fifty were discovered in operation at an underground facility in Espelkamp on 4th April 1945 and a further number were located at Celle.

      At the Richard mine in Czechoslovakia another underground enrichment plant was destroyed with explosives in the final hours of WW2 to prevent it falling into Russian hands.

      Because the total numbers built can’t be established if we assume at least 100 centrifuges were in production by the end of 1944 that means each machine could produce 250 grams of 80% HEU every 12 days.

      Using 100 machines that equates total production of 25kg HEU every 12 days.

      The Manhattan Project had nothing like that capability

      Incidentally Heisenberg was not the pivotal factor in Nazi nuclear achievements. Others like Diebner, Schumann, Trinks, Gerlach and Harteck displayed far more genius. Heisenberg was peripheral to the German atomic bomb project.

      • Simon Gunson says:

        I wish to correct my own post above. Only 40 Mark IIIB centrifuges were found at Espelkamp after checking my own notes.

  2. jew from the crew says:

    It was very hard for me to learn quantum mechanics, because I disliked Heisenberg algebraic approach so much. The quantum mechanics term \Vernichtungsoperator\ made me suspicious. Gotcha!
    I started to read his bio and that of Pascual Jordan and disliked him even more.

  3. Goy from the convoy says:

    More of a Schrödinger man, then? At least here was someone whose behavior could be respected to a degree, statements of feigned non-opposition to the party made after extensive cowing notwithstanding.

    Heisenberg’s betrayal of friends and close collaborators who came from Jewish or partly Jewish families is somehow especially chilling to me.

  4. herbertificus says:


    If the requirements to build a Bomb were too Herculean for Germany, how is it that Japan successfully detonated an atomic test Bomb on August 12, 1945? Seems to me that any scientific achievement that Japan could accomplish, Germany could certainly accomplish.

    Let me also say here, thank God for Jews and Jewish scientists. Not only were they instrumental in developing America’s A-Bomb, but they also did most of the heavy lifting in putting Neil and Buzz on the moon.

  5. Tholzel says:

    You mean like Werner von Braun and his crew of several hundred Germans?

    • herbertificus says:

      I didn’t exclude the Germans at all. They rightfully deserve their share of the credit.

  6. pister pillow says:

    Those of you who propose that Heisenberg did not know how to build a bomb are living by a lie. Of course his numbers and his math are sloppy. Would you live in Germany under Hitler’s regime and give accurate numbers and then proclaim We can’t make a bomb !! Let everyone who is rave enough to have done so proclaim that Heisenberg did not have any idea of how to make a bomb.

    Liars and weak thinkers are robbing the glory of one of humanity’s greatest heroes.

    The idea that he quickly deduced how to make a bomb after the Hiroshima reports are fantasy. and are plumbing unconscious levels of stupidity . How many BBC broadcasts openly discuss the mechanics of a atom bomb construction ? How many physics research libraries did Farm Hall maintain?

    In living by this lie, first promulgated by the Alsos report and Professor Samuel Gaudsmit , who hated all Germans for the death of his parents. These weak minded individuals combine to rob the glory from what is perhaps the greatest hero of the entire war.

    Lies like these, and those who live by a lie are the root cause of a loss of liberty.

  7. Dirk Finkemeier says:

    Heisenberg explained on the 7.August 1945 that the bomb must have screwn together in the airoplane with two uncritical masses, before the bomb must thrown.

    That is exact, how the german 76 bomb worked in August 1943.

    There is a report in Maxwell Alabama Airforce Base , S.R.A.4394 about that german(Atomic) bomb.

    So Heisenberg must have known something about that IG Farben Bomb

    Dirk Finkemeier.

    • Simon Gunson says:

      Dirk is referring to the IG Farben device known as 76-Zentner captured by the American 9th Army in an underground complex inside a hill above Goslar on 26th April.1945.

      Charles Lindbergh who was a qualified B-24 pilot employed as a consultant to the US Naval Technical Mission Europe flew the 3.8 tonne weapon back to the United States and it is highly likely that this was the Uranium weapon dropped on Hiroshima.

      USA had two Atomic Bomb projects one called FAT MAN and the other called THIN MAN. Both of these projects intended to use Plutonium, not Uranium 235.

      There was no LITTLE BOY project before April 1945. By March 1945 Oak Ridge had only produced 15kg of HEU, so where did 64kg of HEU used in LITTLE BOY suddenly materialise from?

      The true history of WW2 and the race for the Atomic bomb has not been told yet.

  8. Martin Page says:

    There is a lot of confusion over the critical mass of uranium 235 as there are two aspects to be considered. One is the theoretical calculation and the other is the numerical value. The numerical value is dependent on the various values of the physical parameters known at the time and vary wildly. There is also no actual critical mass unless you specify the density but there is a critical product of radius x density.

    The theory is invariably based on diffusion and to work successfully requires that there be isotopic scattering and an infinite diffusion range. The former is met but the later presents a problem. The diffusion equation for a chain reaction has no physical form until it is put into the form of a Helmholtz equation and converted, in the case of the bomb, into spherical coordinates which yields sinx/x . Though it appeared logical many ( Fermi, Compton Serber ) set this to zero and the argument as ’pie’( 3.142 ) giving a critical radius equal to pie x diffusion length and a critical mass between 180 and 220 Kg.
    Since the radius ( diffusion range ) is only about 3 time the diffusion length, the diffusion criteria is violated.
    Heisenberg in his lecture at Farm Hall places a medium ( reflector ) around the uranium that has the same diffusion properties but no neutron generation and obtains Pie/2 which with the physical parameters he had gave 60Kg. Using modern parameters this is actually about 17 Kg in line with the Godiva project findings.
    Serber in his Los Alamos primer initially calculates the critical mass as 220 Kg but corrects it later to 60 Kg without giving the method of calculation. He does later though introduce a medium around the uranium calling it a tamper.
    In comparison Heisenberg’s calculation of 10 tons is far too simplistic and pat to be taken seriously except perhaps by a group of military minds.

  9. Martin Page says:

    Interestingly, Heisenberg and Nishina seem to have taken the same approach to the atomic bomb.
    Heisenberg emphasises the huge weight of such a bomb.
    In a meeting with General Nobu-uji on 6th July 1944, Nishina tells him “The weight of the ’ bombe ’ is so great that we view it as not suitable/appropriate“. (subject atomic bomb)
    ‘bombe’ in katakana = high pressure container = inertial confinement.
    ’tekito narazaru ‘= not suitable / appropriate, narazaru is a very old fashion negative term.

  10. Dirk Finkemeier says:

    Time after time I publish the IG Farben Bomb project on my facebook side.Last article was the Norwagian connection Espelkamp-Heroya.

  11. […] ce qu'impliquait l'application de la fission nucléaire à la confection d'une arme atomique. C'est cette hypothèse qui est présentée comme explication principale, en se fondant sur des entretiens accordés par le […]

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