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Edwin Mattison McMillan (September 18, 1907 – September 7, 1991) ... In May 1940, Philip Abelson from the Carnegie Institute in Washington, DC, who had ...
Philip Hauge Abelson (April 27, 1913 – August 1, 2004) was an American physicist, scientific editor and science writer. Trained as a nuclear physicist , he co-discovered the element neptunium , worked on isotope separation in the Manhattan Project , and wrote the first study of nuclear marine propulsion for submarines.
Although many false claims of its discovery were made over the years, the element was first synthesized by Edwin McMillan and Philip H. Abelson at the Berkeley Radiation Laboratory in 1940. [6] Since then, most neptunium has been and still is produced by neutron irradiation of uranium in nuclear reactors.
Philip H. Abelson was a young physicist who had been awarded his PhD from the University of California on 8 May 1939. [18] He was among the first American scientists to verify nuclear fission, [19] reporting his results in an article submitted to the Physical Review in February 1939, [20] and collaborated with Edwin McMillan on the discovery of ...
On May 27, Edwin McMillan and Philip Abelson publish the discovery of neptunium at the Berkeley Radiation Laboratory. They use the 60-inch cyclotron produce a small sample of neptunium-239 via neutron bombardment of uranium-238. They also correctly assume its beta decay to the alpha-emitting plutonium-239, but are unable to isolate it. [23]
Edwin McMillan and Philip H. Abelson blasted uranium with a beam of particles to create the first synthetic element, heavier than uranium – element 93, which they named neptunium. The next synthetic element, plutonium , quickly followed in 1941, which scientists realized was readily able to undergo fission in a way capable of producing the ...
A letter by Edwin McMillan and Philip Abelson published in the Physical Review on 15 June 1940 stated that this decayed to an element with an atomic number of 93, and then to one with an atomic number of 94 and mass of 239, which, while still radioactive, was fairly long-lived. [60]
This new development was also confirmed in independent work by Edwin M. McMillan and Philip Abelson at Berkeley Radiation Laboratory also in 1940. Nicholas Kemmer of the Cambridge team proposed the names neptunium for the new element 93 and plutonium for 94 by analogy with the outer planets Neptune and Pluto beyond Uranus (uranium being element ...