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27-s  263 Db was produced in the  249 Bk (  18 O, 4 n ) reaction at 93 MeV. The activity was transported by a He/KCl-jet to the laboratory where it was collected for 15 min and then subjected to a chemical separation specific for group-4 elements. The activity was dissolved in 0.5 M unbuffered  α -HiB and eluted from a cation-exchange column. The effluent was made 9 M 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 20 min was observed and assigned to the nuclide  263 Rf. It is formed by electron-capture decay of  263 Db with a decay branch of 3 +4  -1 %.

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