Web Results

Manhattan Project


The Manhattan Project was a research and development project that produced the first nuclear ... There were fears that a German atomic bomb project would develop one first, ... physicists Leó S...

U-238 | Define U-238 at Dictionary.com


U-238. or U 238. Word Origin. Chemistry. 1. uranium 238. ... If you can use your demons to separate U-235 from U-238, you can use them for separating gold ...

What are the differences between uranium 235 and 238? - Quora


The most salient difference is in how each isotope can be induced to undergo fission. U-235 is ... Erik Anson, Physics/Cosmology Ph.D. student ... [2] We can use fast neutrons only if we're producing staggeringly huge ... The chemical behavior is so similar as to be identical from what I understand (though I am not a chemist).

Frequently Asked Questions | Nuclear Reaction | FRONTLINE | PBS


And if you recycle, you will eventually be able to use 100% of the uranium, and not the less than one percent ... And let me call them by their names, uranium- 235 and uranium-238. .... So it totally changes the character of the nuclear waste problem. ... Q: Do you think most people trust the DOE nuclear physicists, the utilities?

Lawrence and the Bomb - American Institute of Physics


Concern about the military potential of fission would lead physicists to ... Edwin McMillan used the large neutron flux from Lawrence's ... McMillan and Seaborg would share the Nobel Prize for chemistry in 1951 for their work on transuranics. ... the scarce isotope uranium-235 from the much more abundant uranium-238.

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 ...

Chemical Physics Letters | Vol 503, Isss 4–6, Pgs 187-344, (17 ...


We use the photoCIDNP effect to spatially encode NMR experiments with a laser. .... Systematic deformation of a precipitation front into a 2D stationary profile can be ... and discussed by a simple way taking only acid-base chemistry into account. ... Pages 235-238; Vytautas Balevicius, Zofia Gdaniec, Vytautas Klimavicius, ...

Introduction and overview - Books - IOPscience


Physicists and chemists commonly designate atomic number by the ... the upper- case letter A. If the letter N is similarly used to designate the number of neutrons ... the rare U-235 isotope would fission under neutron bombardment, while U-238 .... First, it stopped the projectile piece from bashing its way through the front end  .....

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 ...

View - Max Planck Institute for the History of Science


would have suggested that building a nuclear explosive might be feasible. ... 2005, when The New York Times wrote: “In 1939, the German physicist Werner .... bomb works, in order to communicate effectively with Hahn, a chemist, not ..... why you used to tell me that one needed 50 kilograms of '235' in order to do anything.

More Info

Chapter II. Statement of the Problem - Trinity Atomic Web Site


For purposes of clarification we may make use of some knowledge which ... Thus the question of whether a chain reaction does or does not go depends on the ... U -234, U-235, and U-238, present to the extent of approximately 0.006, 0.7, and ..... (For example, the Handbook of Physics and Chemistry for 1943-1944 says ...

What is the difference between uranium-235 and uranium-238 ...


Feb 8, 2013 ... Shashikant Phatak · Institute of Physics, Bhubaneswar ... U-235 can be used directly while U-238 is first converted to Pu-239 by neutron reaction. ... Atomic percentage of U235 and U238 in natural uranium are about 0.72% ...

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 (an ... Children did not use their full names in school in Oak Ridge, Tennessee.