Synthesis of element 103
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Lawrencium “…The history of the discovery of element 103 was also found to be quite complex. In 1961 in Berkeley (USA), A. Ghiorso et al. announced the discovery of a new element with atomic number 103 (isotope with mass number 257) and they called it “lawrencium” [18, 19]. However, an analysis of the possible errors and backgrounds was not undertaken in this work. Experiments carried out in Dubna [20-24] later showed that the work was erroneous. |
is a chemical element in the periodic table that has the symbol Lr and atomic number 103.
| In 1965, a group of experimenters in Dubna established unambiguously that in the reaction Am243 + O18 the isotope 103256 is formed [20]. Up to the present time, three isotopes of element 103 with mass numbers 255,256, and 257 [20-24] have been discovered and studied. Careful searches for an isotope with the characteristics of the American element 103 – lawrencium – did not give positive results [21]…” |
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From “SYNTHESIS AND SEARCH FOR HEAVY TRANSURANIUM ELEMENTS” G. N. Flerov,(p.3). Translated from Atomnaya Energiya, Vol. 28, No. 4, pp. 302-309, April, 1970. “ History of the Discovery of Element 103″. From “THE HISTORY OF THE TRANSFERMIUM ELEMENTS”, G.N.Flerov, I.Zvara, G.M.Ter-Akopian, V.A.Shchegolev and V.L.Mikheev. JINR Reports (1989), Dubna, Russia |