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Vol. 25 No. 5
September-October 2003

IUPAC Wire | News and information on IUPAC, its fellows, and members organizations
See also www.iupac.org/news

Element 110 is Named Darmstadtium

On 16 August 2003 at the 42nd General Assembly in Ottawa, Canada, the IUPAC Council officially approved the name for the element of atomic number 110, to be known as darmstadtium, with symbol Ds. The proposal was recommended by the Inorganic Chemistry Division. In 2001, a joint IUPAC-IUPAP Working Party (JWP) had confirmed the discovery of element number 110 by the collaboration of Hofmann et al. from the Gesellschaft für Schwerionenforschung mbH (GSI) in Darmstadt, Germany [Pure Appl. Chem. 73, 959-967 (2001)]. The most relevant experiment resulted from the fusion-evaporation using a 62Ni beam on an isotopically enriched 208Pb target, which produced four chains of alpha-emitting nuclides following the presumed formation of 269110 + n. [S. Hofman et al., Z. Phys. A350, 277-280 (1995)].

bombardment of lead with nickel ions
20882Pb + 6228Ni –––>269110 (0.17 ms) + 10n

Since then, the JWP has re-examined the discovery of 110, in view of the obligatory re-assessment brought on by revelations at the Berkeley [Y.A. Lazarev et al., Phys. Rev. C54, 620-624 (1996)] and GSI laboratories [S. Hofmann et al., E. Phys. J. A14, 147-157 (2002)] of some apparently fabricated or partially modified decay chains. In its soon to be published report, the JWP re-endorses the confirmed synthesis of element 110 by the team at GSI led by S. Hofmann.

In accordance with IUPAC procedures, the discoverers at the GSI were invited to propose a name and symbol for element 110. They proposed the name darmstadtium, with the symbol Ds. Thus continues the long-established tradition of naming an element after the place of its discovery.

<www.iupac.org/news/archives/2003/naming110.html>


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