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The Development of Nuclear Science ( WWII )

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The Development of Nuclear Science ( WWII ) Democratic parties Right wing parties In January 1933 Left wing parties Hitler was appointed by President Hindenburg as new German Chancellor -Reichstagsbrand- 27 February 1933 This Decree of the Reich President for the Protection of the People and State abrogates the following constitutional protections: • Free expression of opinion • Freedom of the press • Right of assembly and association • Right to privacy of postal communications • Protection against unlawful searches & seizures • Individual property rights • States' right of self-government A supplemental decree creates the SA (Storm Troops) and SS (Special Security) Federal police agencies. The Reichstag building, seat of the German parliament, burns after being set on fire. This enabled Adolf Hitler to seize power under the pretext of protecting the nation from threats to its security. (Photo credit: U.S. National Archives) Consequences for Science and Academia Removal from all Jewish faculty members from their posts (Law of restoration of Career Civil Service 1933). Many of the leading figures emigrated. Bernhard Rust became Minister of Education took more flexible stand. Jewish scientists were allowed to hold temporary assistant posts, but were facing increasing administrative difficulties. KWI under Planck tried first to remain independent but got more involved in war related KWI for Physics in Berlin with van research during WW-II. de Graaff Accelerator tower in front Nuclear Reactions and Energy Release Frederic Joliot and Irene Curie at Paris had observed the first nuclear reaction. Enrico Fermi showed the existence of neutron induced reactions which produce artificial radioactivity. Nuclear reactions can produce energy Q > 0 exothermic or need energy Nobel Prize 1938 Q < 0 endothermic A(a,b)B Q = (m + m -m -m)·c2 a A a B b Q = BB+ Bb-BA-BB A difference of masses in entrance and exit channel determines Q The discovery of fission 1938 Search for transuranium elements Z>92 238 239 - 239 - 239 U (n, γ) U92 (β ) E93 (β ) E94 238 235 U (n, α) Ra88? Nobel Prize 1944 Hahn and Strassmann identified broad variety of elements, they thought those to be near Uranium, e.g. Z=88 Radium The interpretation of fission I Hahn and Strassmann repeated the experiment numerous times and were never able to isolate the ‘radium’ from barium. They reported their results as follows: "As chemists, we must actually say the new particles do not behave like radium but, in fact, like barium; as nuclear physicists, we cannot make this conclusion, which is in conflict with all experience in nuclear physics." Hahn, the chemist, was reluctant to go against the ideas of nuclear physicists, despite clear chemical evidence of barium. Close correspondence with collaborator Lise Meitner who had emigrated to Stockholm in 1938 to Manne Siegbahn. The Interpretation of Fission II Now whenever mass disappears energy is created, according to Einstein's formula E = mc2, and... the mass was just equivalent to 200 MeV; it all fitted! Meitner was convinced that the product actually was Barium rather than a homologue. The nightmare of contradictory evidence all fit the explanation that Uranium had fissioned (broke into pieces) rather than form a heavier element. Frisch calculated the energy needed, and Meitner calculated the energy available. The other fragment must be Krypton to conserve atomic 1 238 137? 84? 1 number. 0n + 92U -> 56Ba + 36Kr + 18? 0n Niels Bohr Brought news of fission to the US at the fifth Washington Conference on Theoretical Physics. Several researchers went back to their labs and confirmed the work and reported back before the conference was over. Within a few month Bohr and Wheeler predicted the possibility of chain reaction by fission of 235U with similar energy out put as 238U. Problem was to generate 235U, which is a very rare Uranium isotope. Germany stopped all Uranium exports Chain Reaction (?) The following is an example of a predicted fission reaction which generates neutrons besides energy. The two fission products are very radioactive as they have far too many neutrons in their nuclei. The neutrons are ejected and will then trigger subsequent fission processes ⇒ Chain reaction 1 235 142 91 1 0n + 92U → 56Ba + 36Kr + 3 0n Fission fragments When 235U undergoes fission, the average of the fragment mass is about 118, but very few fragments near that average are found. It is much more probable to break up into unequal fragments, and the most probable fragment masses are around mass 95 and 137. Most of the fission fragments are radioactive, intense short lived and long-lived radioactive elements are released into the environment. Energy release in fission Total energy = energy release/fission · number of fission events Suppose you have 5 kg of 235U and 10% of it undergoes fission, calculate the total energy release? 23 NA≡ Avogadro’s Number = 6.023·10 A gram of isotope with mass number A contains NA isotopes 235 95 137 92U143 ⇒37 Rb58 + 55 Cs82 + Q 235 23 235 235g( U ) ≡ 6.023⋅10 U isotopes 95 137 235 Q = B(37 Rb58 ) + B( 55 Cs82 ) − B( 92 U143 ) 500 500g(235U ) ≡ ⋅6.023⋅1023 =1.28⋅1024 235U isotopes Q = 803.7MeV +1,149.3MeV −1,783.8MeV =169MeV 235 Q ≈ 200MeV = 200⋅1.6⋅10−13 J = 3.2⋅10−11 J Total energy release ≈ 4.1·1013 J = 9.8·103 tons TNT ≈ 10 k-tons TNT (Definition: 1 ton of TNT = 4.184 x 109 joule (J). ) 1939 Begin of World War II • Japan Invades China Hitler Invades Poland France Belgium Netherlands Norway Danmark Yugoslavia Greece World War II Weapons of Mass Destruction Concept of Strategic Air Bombing introduced by Sir Hugh Trenchard W W II (1939-1945) 1940-41: Battle for Britain Civilian population targeted 1941-1944: Allied Bombing Campaign: Incendiary bombs Carpet bombing Artificial firestorms ~1000 planes/ several tons of bombs each Sir Arthur Harris (Bomber Harris) Bombing Technique Developments German air raids against Britain killed approximately 60,000 civilians and seriously injured about 80,000 more. British and US air raids against Germany killed approximately 300,000 civilians and seriously injured about 780,000 more. Large 500-1000 plane bombing armadas (limited defense) As well as area bombing techniques and firestorm techniques Firestorm Technique This was achieved by dropping incendiary bombs, filled with highly combustible chemicals such as magnesium, phosphorus or petroleum jelly (napalm), in clusters over a specific target. After the area caught fire, the air above the bombed area, become extremely hot and rose rapidly. Cold air then rushed in at ground level from the outside and people were sucked into the fire. Technique The fire storms developed winds up to 300 mph and air temperatures estimated at 1,000 degrees. Hamburg; July 28, 1943: ~ 50,000- 80,000 Dresden; February 13, 1945: ~ 35,000-100,000 Tokyo; March 9-10,1945: ~100,000-200,000 Stack (chimney) effect in thermodynamics Ti −To v = 0.65⋅ 2g ⋅ H ⋅ Ti For typical firestorm: v=wind velocity in m/s H ≈ 1000-2000 m g=9.8 m/s2 earth acceleration T ≈ 1300 K H=height of heat column in [m] i To ≈ 300 K To=outside temperature, K T =inside temperature in K i ➱ v ≈ 98m/s = 220 miles/h Hurricane speeds ~100 miles/h Victims In the ABC radio documentary, Tokyo’s Burning, B-29 pilot Chester Marshall recalled the experience of bombing Tokyo that night: You know, you didn’t know whether you were killing a lot of women and children or what. But I do know one thing, you could at 5,000 feet you could smell the flesh burning. I couldn’t eat anything for two or three days. You know it was nauseating, really. We just said “What is that I smell?” And it’s a kind of a sweet smell, and somebody said, “Well that’s flesh burning, had to be.” Technological Escalation in WW II Technological escalation during World War II was more profound than in any other period in human history. More new inventions, certainly as measured by such means as patent applications for dual- use technology and weapon contracts issued to private contractors, were deployed to the task of killing humans more effectively, and to a much lesser degree, avoiding being killed. Unlike technological escalation during World War I, it was generally believed that speed and firepower, not defenses or entrenchments, would bring the war to a quicker end. Second goal was to weaken enemy moral by direct attacks of civil population designed for maximizing devastation..
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