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Darmstadtium
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Name and symbol of element of atomic number 110 (IUPAC Recommendations 2003) http://www.iupac.org/publications/pac/2003/7510/7510x1613.html
"Element 110 has been discovered by the collaboration of Hofmann et al.," S. Hofmann, V. Ninov, F. P. Hessberger, P. Armbruster, H. Folger, G. Münzenberg, H. J. Schott, A. G. Popeko, A. V. Yeremin, A. N. Andreyev, S. Saro, R. Janik, M. Leino. "Production and decay of 269110", Zeitschrift für Physik Phys. A 350, 277-280 ( November 14, 1994 ). |
| The 2001 Joint Working Party summarized the effort with the following description: "The fusion-evaporation reaction using a 62Ni beam on an isotopically enriched 208Pb target produced four chains of alpha-emitting nuclides following the presumed formation of 269Ds + n. The heavy residue is separated from non-fusion residues in-flight by the electromagnetic SHIP velocity filter which spatially localizes, through position sensitive detectors, the product and its radioactive progeny. Even in the first chain to be measured, the second and third consecutive alpha energies and delay times are in concordance with previously studied 265Hs and 261Sg. The redundancy of the consecutive alpha energies and delay times in the second through fourth chains measured is very reassuring. Even more so is the observation of fourth and fifth alpha particle energies and delay times in the last two chains observed that are in very good agreement with the known properties of descendants 257Rf and 253No." In a similar, but more recent collaboration working on elements 111 and 112, Hofmann et al. noted that one of the four Z = 110 chains, the second, could not be reconstructed from the original data. The extant chains remain persuasive. Y. A. Lazarev, Y. V. Lobanov, Y. T. Oganessian, V. K. Utyonkov, F. S. Abdullin, A. N. The bombardment of 244Pu by 34S produced, by a hot fusion pathway, one chain of spatially and temporally correlated alpha-emitting nuclides which was assigned to the product 273Ds. 3416S + 24494Pu → 273110Ds + 5 10n The evaporation residues were separated in flight by a recoil separator. The investigators interpret their results as a sequence of five alpha-emitting nuclides beginning with 273Ds. However, only three of the alpha particles are observed. A number of additional incomplete chains and one incomplete 5- |
| APSIDIUM | Created: | 2002-09-01 |  110.pdf | ||
| Page update: | 2006-11-05 | |||
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chain are also noted, but with less confidence. There remains the question as to whether subsequent studies might confirm the observed steps in these incomplete chains. Although the referenced chain´s 273Ds alpha energy agrees with that seen in the recent Hofmann et al. collaboration, the subsequent two observed alphas have delay times at sharp variance with literature values for 265Sg and 257No.
