Tag: Manhattan Project

Movie Review: Oppenheimer

Any regular reader of this blog would have to expect that I would be seeing, and reviewing the new film ‘Oppenheimer’ as soon as possible. After all, the development of the atomic bomb, and the man (played by actor Cillian Murphy) who directed that development, are watershed moments in the history of science in general, and physics in particular.

Poster for the Christopher Nolan film ‘Oppenheimer’. (Credit: Goelevent.com)

Now, ‘Oppenheimer’ is not the film industry’s first attempt at telling the story of the Manhattan Project, to use the code word for the building of the first nuclear weapon. Shortly after World War 2 the film ‘The Beginning, or the End’ was the first while two other notable efforts are ‘Fat Man and Little Boy’ along with the TV movie ‘Day One’. There’s even a grand operatic telling of the story, ‘Doctor Atomic’ by the composer John Adams.

In the opera ‘Doctor Atomic’ Oppenheimer is a tenor while General Groves is a bass. Still it’s another version of the story of the bomb! (Credit: IMDb)

Those movies concentrated on the building of the bomb however while ‘Oppenheimer’ deals much more closely with the man. Based upon the book ‘American Prometheus’ by Kai Bird and Martin Sherwin, Christopher Nolan’s film includes portions of Oppenheimer’s life both before the war, and more tragically after.

Cillian Murphy plays Oppenheimer in the movie based upon the book ‘American Prometheus’ by Kai Bird and Martin Sherwin. (Credit: Men’s Health)

As a director Christopher Nolan likes to use the time-skipping, stream of consciousness style, in ‘Oppenheimer’ we are actually present at the Atomic Energy Commission’s review of Oppenheimer’s security clearance in 1954 and that hearing is then used as a setting for a series of flashbacks into portions of Oppenheimer’s life.

Stream of Consciousness may be the way our brains actually work but it is a very difficult writing, or film making style on both the author and audience. (Credit: ProwritingAid)

Beginning with a tour of Europe by the new doctor of Physics Oppenheimer meets other important physicists like Niels Bohr and Werner Heisenberg while learning about the new physics being developed in the 1920s. It’s also during this time that Oppenheimer becomes acquainted with American Physicist I. I. Rabi (played by David Krumholtz) who became a great friend of Oppenheimer but who rarely gets mentioned in stories about the Manhattan Project for reasons I will discuss in a little while.

A leader in the post WW2 generation of physicists I. I. Rabi received the Nobel Prize for his description of Nuclear Magnetic Resonance making possible the modern MRI. (Credit: Wikipedia)

After learning the secrets of Quantum Mechanics in Europe Oppenheimer returns to the US where he joined the faculty of UC Berkeley and became the theoretical counterpoint to experimentalist Ernst Lawrence (played by Josh Hartnett). The gentle antagonism between these two was actually one of my favourite parts of the movie.

Ernest Lawrence and his cyclotron, the first in a long series of ‘atom smashers’ leading to today’s Large Hadron Collider (LHC) at CERN. (Credit: Facebook)

While at Berkeley Oppenheimer also becomes involved with left-wing politics, his brother, his wife (played by Emily Blunt) and several close friends were all one-time members of the communist party although Oppenheimer himself never joined. These associations would later prove to be Oppenheimer’s downfall.

Fueled by the depression during the 1930s the Communist Party of America attracted many followers including many in academia. (Credit: Marxists Internet Archive)

The central portion of ‘Oppenheimer’ is of course his years as the scientific director of the Manhattan Project and leading scientist at Los Alamos labouratory. Oppenheimer was chosen for the position over several Nobel laureates by General Leslie Groves (Played by Matt Damon) for reasons that are still a bit murky, Groves just seemed to trust Oppenheimer more than the other, more prestigious physicists. Unlike the other versions of this story in ‘Oppenheimer’ Enrico Fermi and the other scientists at the University of Chicago have minor roles simply because they rarely interacted with Oppenheimer.

Constructed beneath the handball courts at the University of Chicago the first nuclear reactor was a critical step in the Manhattan Project but since Oppenheimer had little to do with the reactor it only appears for one brief scene in the movie. (Credit: Smithsonian Magazine)

Although I knew very well many of the details of the development of the A-bomb director Nolan still managed to make this portion of the movie engrossing and at times thrilling. Even though many filmgoers would be unfamiliar with nuclear physics and might be confused by such terms as isotopes, implosion and critical mass Nolan refused to turn his movie into a science lecture. ‘Oppenheimer’ is about the people who believed they were doing the right thing by building the most powerful weapon ever rather than the actual science of building a bomb. All the scientists at that time believed that the Nazi were also working on a bomb and were certain that with such men as Heisenberg the Germans had a 12-18 month head start.

Werner Heisenberg (r) led the German atomic bomb but because Hitler (l) considered modern physics to be ‘Jewish Science’ the German program never got much support and at the end of the war Heisenberg had barely started building a reactor. (Credit: First Curiosity)

After the war, and after Hiroshima and Nagasaki, many of those who worked on the Manhattan Project hoped to find some way to prevent an arms race, to stop the proliferation of nuclear weapons, to ‘put the nuclear genie back in the bottle’. In particular Oppenheimer’s opposition to the development of the even more powerful Hydrogen Bomb made him a number of enemies among the anti-communist politicians of the early 1950s. One in particular was Lewis Strauss (Played by Robert Downey Jr.) head of the Atomic Energy Commission. It was Strauss who orchestrated the hearings on Oppenheimer’s security clearance, using Oppenheimer’s known associations with communist party members back in the 1930s to question his loyalty. Many people today believe that it was the rescinding of his clearance that broke Oppenheimer, he stayed well out of the public eye for the rest of his life, but perhaps it was simply the final straw.

Security’s twin gods of ‘Clearance’ and ‘Need to Know’ are recurring themes in ‘Oppenheimer’. Who gets clearance and who doesn’t is often a matter of politics as much as loyalty to America. (Credit: Advantis Global)

My one complaint about ‘Oppenheimer’ deals with the portrayal of physicist I. I. Rabi. As I mentioned above Rabi is rarely mentioned in other stories about the first atomic bomb because despite his friendship with Oppenheimer he refused to join the Manhattan Project. In ‘Oppenheimer’ however Rabi plays a large role and the movie actually includes the scene where Rabi turns down Oppenheimer’s request to work on the project. In fact the movie seems to imply that Rabi was a pacifist who did not contribute to America’s war effort.

The Manhattan Project was not the United States’ only top secret program during WW2. The Radiation Lab at MIT produced a large number of radar systems that not only detected enemy aircraft but submarines along with radar trackers for naval guns and anti-aircraft weapons. (Credit: Google Arts and Culture)

Nothing could be further from the truth. Rabi was a central figure at MIT’s Radiation Labouratory developing the radar systems that gave the allies a tremendous advantage over the axis powers. After the war Rabi was known to say, “The Atomic Bomb may have ended the War, but Radar won it!” 

Still the atomic bombings of Hiroshima and Nagasaki did end the war and for good or ill started the nuclear age. (Credit: The Conversation)
Prometheus Bound by Peter Rubens. The Greeks understood how we often punish those who try to help us! (Credit: Wikipedia)

As a film ‘Oppenheimer’ is a great achievement, a thought provoking view on one of the most important moments in history and the man at the center of it. The acting is simply superb, the effects outstanding, the direction taught and engrossing. ‘Oppenheimer’ is just one of the best movies to come along in a long time so go see it. In Greek mythology Prometheus stole fire from heaven and brought it to men. For that the Gods chained him to a rock and tortured him for eternity. Oppenheimer’s greatest achievement, along with how he was treated afterwards, mirrors the Prometheus story in many ways.

 

What ever happened to the uranium fuel from Nazi Germany’s attempt to build a nuclear reactor?

Nearly everyone knows the basic outline of this story, it is after all one of the most important series of events that occurred during the 20th century. In the late 1930s, while the threat of a coming world war grew physicists were learning the secrets of the atom and wondering if it could be possible to release the tremendous energy contained within the nucleus, both for power generation, and for weapons.

The process of Uranium Fission. Started by a single neutron the process releases both energy and more neutrons to produce a chain reaction. (Credit: Nuclear-Power.net)

The countries that would become the allied nations feared that Nazi Germany could become the first to develop an atomic bomb. After all, both the theories of relativity and quantum mechanics were first conceived by Germans and many of the leading researchers in sub-atomic physics were German. In fact the scientists who first succeeded in splitting atoms of Uranium, Otto Hahn and Fritz Strassmann were both German and their fission experiment was performed in Berlin!

The Experimental Apparatus used to first split the nucleus of Uranium (Credit: J. Brew / Flickr)

Hoping to beat the Germans to the bomb the Americans, with help from the British, organized the massive ‘Manhattan Project’. The American program did succeed in producing the first nuclear weapons but not until several months after Nazi Germany had been defeated. In fact when allied scientists searched through the rubble of Hitler’s Reich for Nazi scientists and technology they were surprised to discover how little progress the German nuclear physicists had made.

The Manhattan Project succeeded in developing the first atomic bomb whose first test was the Trinity Test. (Credit: Wikipedia)

There were many reasons why the Nazi atomic bomb program failed. One reason worth considering in today’s political climate would be how the Nazi’s own racism forced some of the world’s greatest minds to flee Europe for the safety of the United States. Men like Albert Einstein, Niels Bohr, Erwin Schrödinger, Hans Bethe, Max Born and many others would all contribute to the Manhattan Project, helping America develop the bomb first.

Albert Einstein was just one of dozens of German scientists who fled their country to escape the Nazis. The loss of their talents weakened the German nuclear program. (Credit: Viva)

There were other reasons as well; one interesting one was the Nazi’s tendency towards an almost feudal disorganization in their nuclear program. In fact the German nuclear program was more like nine distinct programs, each with its own director, each of which set its own agenda and goals with little coordination between the different groups. In contrast the Manhattan Project had one boss, Major General Leslie Groves who, with his science advisor Robert Oppenheimer made certain that everyone and everything in his command worked together for one goal, an atom bomb.

Major General Leslie Groves brought a degree of Military discipline to a bunch of scientists working on the Manhattan Project. (Credit: Wikipedia)

The German nuclear program’s greatest success was in the construction of a nuclear reactor by the Uran-Maschine (Uranium Machine) group in the city of Haigerloch. This group was headed by the Nobel Prize winning theoretician Werner Heisenberg along with his assistant the experimentalist Robert Döpel. The reactor these two scientists designed consisted of some 664, 2kg uranium cubes each about 5cm to a side. These cubes were hung from chains and then immersed in heavy water, which acted as a moderator slowing the neutrons in order to increase their chance of striking a uranium nucleus and maintaining the chain reaction. See image below.

German Physicist Werner Heisenberg led the German attempt to construct a nuclear reactor (Credit: IMDb)
The nuclear reactor designed and built by Heisenberg. The 664 uranium cubes are strung along aircraft cable (Credit: Atomicheritage.org)

Although the reactor was completed it never achieved criticality. That is the reaction never reached the condition where enough neutrons were being produced by the splitting of uranium nuclei to sustain the chain reaction indefinitely. Modern calculations indicate that the reactor design would have required a 50% increase in the number of uranium cubes in order to work. By comparison Enrico Fermi and his group had succeeded in establishing the first sustained nuclear reaction with their reactor in December 1942.

Artist’s rendering of the moment the first nuclear reactor went critical. (Credit: Smithsonian Magazine)

With the fall of Nazi Germany the experimental reactor at Haigerloch was captured by the US Army along with the scientists who worked there. The army troops who seized Haigerloch were accompanied by members of a special project known as Alsos who were attached to the Manhattan Project and led by the physicist Samuel Goudsmit. The Alsos team both interrogated the German scientists and examined the reactor. The captured scientists, including Heisenberg, were later sent to Britain and incarcerated for a time. The reactor was dismantled and the equipment, along with the 664 uranium cubes shipped to the US.

So what happened to those 664 uranium cubes? Well, it is likely that most were simply inserted into the Manhattan Project’s supply chain and eventually the uranium became part of American nuclear reactors or weapons. Some however definitely did not, instead becoming souvenirs that were passed from one person to another. Several of these cubes have found their way into museums including a museum at Haigerloch Germany dedicated to telling the story of Hitler’s reactor. Other known examples include Harvard University and the National Museum of American History in Washington DC. It is possible however that there are some still out there sitting in someone’s attic or garage.

One of the remaining uranium cubes from the Nazi nuclear reactor. (Credit: Science News)

Timothy Koeth, an associate research professor of the University of Maryland is now trying to discover what happened to as many of the uranium cubes as he can. Professor Koeth has even established an email address so that anyone who may have information about the cubes can contact him. The address is:

uraniumcubes@umd.edu

So if you have this old black cube that your grandfather brought back from the war and kept for reasons he never made clear contact Professor Koeth. Maybe that’s a real piece of Hitler’s nuclear reactor!