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Manhattan Project


The Manhattan Project was a research and development project that produced the first nuclear ... The discovery of nuclear fission by German chemists Otto Hahn and Fritz ... There were fears that a G...

Manhattan Project Facts, information, pictures | Encyclopedia.com ...


In 1939, the two scientists drafted a letter (addressed from Einstein) warning United ... Groves recruited American physicist Robert Oppenheimer (1904–1967) to be ... an explosive chain reaction were either U-235 (derived from U-238) or P- 239 .... use against a Japanese city was unnecessary and immoral and would start a ...

The Manhattan Project - OSTI


Administration hope that the National Security History Series will provide the Department and ... Einstein drafted his famous letter with the help ... nuclear physics and chemistry. ... using uranium in 1939 and early 1940, fell under .... between the uranium-235 and uranium-238 ...... committee to distinguish a clear front-runner.

The Nazi Nuclear Program – How Close Were the Nazis to ...


Aug 25, 2009 ... Like uranium 235, element 94 would be an incredibly powerful explosive. ..... As to the notion that Einstein who was a German writing a letter to FDR, ..... and have sufficient knowledge of physics, chemistry and metallurgy, unless ..... have been used against the Russians on the Eastern Front during WWII?

ORNL: The First 50 Years - Oak Ridge National Laboratory


Laboratory endeavors range from studies of nuclear chemistry and physics to ... It was really uncanny how he dictated a letter in German with enormous readiness. ... uranium-235 could be separated from uranium-238 for weapons use, and .... Scaling up Fermi's pile would not do, because extracting plutonium from the ...

A Factor of Millions - Federation of American Scientists


in the great European school of physics—were already engaged in probing the ... Szilard then also thought of using neutron-induced chain reactions to create .... A successful fission bomb would require a few kilograms of uranium-235, ... It was tasked with producing plutonium-239 from uranium-238 in a .... In a letter to Gen.

Nuclear Fusion | Do the Math - UC San Diego - Department of Physics


Jan 31, 2012 ... To make <sup>235</sup>U, we take 92 hydrogen atoms, add 143 neutrons, and stir. ... <sup>238</sup>U, for instance, will typically spit out 8 “teeth” and 6 electrons (beta) in its journey to ... We can use the chart to follow the two reaction types: ... the critical number of neutrons implies some sort of lithium enrichment on the front-end.

Planar Lenses Based on Nanoscale Slit Arrays in a Metallic Film


Letter. Planar Lenses Based on Nanoscale Slit Arrays in a Metallic Film. Lieven Verslegers ... Nano Lett., 2009, 9 (1), 235-238 • DOI: 10.1021/nl802830y • Publication Date (Web): 21 November 2008 ... possible to create a curved phase front for the transmitted ... ment a planar nanoslit lens using a combination of thin film.

Fan Group at Stanford University - Publications


K. Fang and S. Fan, “Control the flow of light using inhomogenous effective gauge field ..... 238. E. Rephaeli, S. E. Kocabas and S. Fan, "Few photon transport in a ... cells", Applied Physics A, vol. 105, pp. 329-339 (2011, Invited paper). pdf 235. .... and S. Fan, "Phase front design with metallic pillar arrays", ...

Can Terrorists Build the Bomb? | Popular Science


Feb 1, 2005 ... Before it can be used in a bomb, uranium must be "enriched," a process that sifts out nonfissile U-238 to increase the proportion of fissile U-235. ... reactors such as the one at the Institute of Nuclear Physics in Uzbekistan. ... A terrorist chemist would cut up the fuel and dissolve it in a vat of boiling ac...

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The Story of the Atom Bomb


Late in 1938, in Berlin-Dahlem, an experiment in nuclear chemistry touched off a wave ... which even reached the front pages of the most conservative newspapers. ... Dr. Lise Meitner, a mathematical physicist, knew, however, that something .... This fissionable isotope has an atomic weight of 235 instead of 238 which is the ...

The Manhattan Project: Making the Atomic - OSTI


its use would not infringe privately owned rights. .... energy. Einstein drafted his famous letter with the help of ... 1939, informing the physicist that he had setup a ... became more complicated when chemists discovered ... uranium-235 and uranium-238 isotopes figured ...... to distinguish a clear front-runner and its consequent.

Geons, Black Holes, and Quantum Foam - The New York Times


The news of fission that Bohr had in his head would be of consuming interest to ... the blindness of physicists and chemists to fission in the mid-1930s can be .... produced grams of uranium 235 (U-235), but not yet the kilograms that would be ... years after Albert Einstein had written a letter to President Roosevelt drawing ...