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...
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 ...
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
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?
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 ...
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.
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.
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
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",
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...