Seaborgium, production

THE NEW VISION INCLUDES A SAFE, EFFICIENT AND RELIABLE PRODUCTION COMPLEX FOR NUCLEAR MATERIALS FOR IMPORTANT NATIONAL PROGRAMS SUCH AS DEFENSE, SPACE EXPLORATION, MEDICINE, INDUSTRIALNEEDS AND RESEARCH,INCLUDINGPRODUCTION AND STUDY OF TRANS-SEABORGIUM ELEMENTS. 

Actinides served already as targets, when neutron capture and subsequent P decay were used for the first synthesis of transuranium elements. Later, up to the synthesis of seaborgium, actinides were irradiated with light-ion beams from accelerators. At that time it was already known that cold fusion reactions yield higher cross sections for heavy element production. 

Seaborgium (Z = 106) cannot be produced directly in " Ca-induced reactions, as it would require a radon target. The 1.9-min isotope Sg occurs in the decay chains arising from Cn and Fl, best produced in the reaction " Pu(" Ca,3n) [316]. The a-decay branch of the intermediate nuclide Ds is only 10%, so the effective production cross section is reduced from 4 pb to 0.4 pb. The 0.4-s isotope Sg is the decay daughter of Hs produced in the Ra( Ca,4n) reaction [133]. A single atom of Sg has been reported in the Fl decay chain, with a decay time of 2 min [353]. The nuclides produced in the " Cm( Ne,5n)... 

Gas-jet transport (see also Experimental Techniques ) is the technique that is probably most familiar to the radiochemist, and was used in the discovery of the superheavy element seaborgium (Z = 106) [172]. Recoiling reaction products are... 

Seaborg, Glenn Theodore (1912-99) An American chemist noted as one of the discoverers of plutonium (plutonium-238 and plutonium-239). Gaining his doctorate in 1937 from the University of California, he was appointed professor of chemistry in 1945. He was responsible for nuclear chemical research at the Lawrence Radiation Laboratory and headed the Manhattan Project group from 1942 to 1946 that devised the chemical extraction processes used in the production of plutonium. He codiscovered nine other transuranium elements, including the element seaborgium, atomic number 106, which is named after him. He was awarded the Nobel Prize in Chemistry in 1951. 

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