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In 1940 the Physical Review published the discovery of element 93, the first element in the periodic table beyond the fissionable element uranium [1]. Although neptunium--named after Uranus's neighbor--was not useful for a bomb, nearly all publication on fission-related work ceased shortly thereafter because of...
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focus.aps.org/story/v14/st17
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This isotope was first produced in 1940 in a cyclotron at the University of California at Berkeley by bombarding uranium-238 with high-energy neutrons. Neptunium was the first transuranic element to be formed and was named for the planet Neptune.
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www.ead.anl.gov/pub/doc/neptunium.pdf
www.ead.anl.gov/pub/doc/neptunium.pdf
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Yet something was able to pass from the current, through the glass walls of the discharge tube, through the black paper, and across several feet of air to create a fluorescence on the screen. ... This series is called the neptunium series after its member of longest half-life, ... This property is useful in identifying radiation.
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www.3rd1000.com/chptr5.htm
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The production of plutonium and neptunium by bombarding uranium-238 with neutrons was predicted in 1940 by two teams working independently: Edwin M. McMillan and Philip Abelson at Berkeley Radiaton Laboratory at the University ... While it is very difficult to create airborne dispersion of a heavy metal like plutonium,
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www.3rd1000.com/elements/Plutonium.htm
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Produced by bombarding uranium with slow neutrons. Neptunium is present in extremely small quantitles in Uranium ores and is created when a neutron that is emitted by one uranium atom undergoing fission is captured in the nucleus of another uranium atom.
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environmentalchemistry.com/yogi/periodic/Np.html
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ELEMENTS that do not exist in nature—that have been created in a laboratory—are unstable. After hours or days of one element bombarding another with enough energy for both to fuse, ... In 1940, Ed McMillan and his team at Berkeley bombarded uranium with neutrons to create neptunium (element 93). Then Glenn Seaborg and...
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www.llnl.gov/str/JanFeb02/Moody.html
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In May 1943, the United States began its effort to create an atomic bomb, ... This work was later useful to researchers investigating missile reentry. ... Initially predicted by Walter Russell, the production of plutonium and neptunium by bombarding uranium-238 with neutrons was predicted in 1940 by two teams working independently:
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www.experiencefestival.com/manhattan_project
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Uranium - Wikipedia, the free encyclopedia
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Uranium (pronounced /jʊˈreɪniəm/ ) is a silvery-white metallic chemical element in the actinide series of the periodic table that has the symbol U and atomic number 92. Besides its 92 protons...
en.wikipedia.org/wiki/Uranium
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Neptunium and plutonium directly follow their planetary companion, uranium, on the periodic table. Appropriately so—scientists use uranium to create both. ... By bombarding uranium with neutrons, scientists at the University of California Berkeley created neptunium in 1940. Their neptunium then changed into...
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www.popularmechanics.com/science/research/4321681.html
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