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Jens Volker Kratz, A. Nähler, U. Rieth, A. Kronenberg, B. Kuczewski, E. Strub, W. Brüchle, M. Schädel, B. Schausten, A. Türler

An EC-branch in the decay of 27-s ²⁶³Db: Evidence for the isotope ²⁶³Rf

27-s ²⁶³Db was produced in the ²⁴⁹Bk ( ¹⁸O, 4n) reaction at 93MeV. The activity was transported by a He/KCl-jet to the laboratory where it was collected for 15min and then subjected to a chemical separation specific for group-4 elements. The activity was dissolved in 0.5M unbuffered α-HiB and eluted from a cation-exchange column. The effluent was made 9M in HCl and group-4 tetrachlorides were extracted into TBP/Cyclohexane which was evaporated to dryness on a Ta disc. The Ta discs were assayed for α and SF activity. A SF activity with a half life on the order of 20min was observed and assigned to the nuclide ²⁶³Rf. It is formed by electron-capture decay of ²⁶³Db with a decay branch of 3⁺⁴_-1.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 91, 01/2003
Pages: 059

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