2003/01/01 by J. V. Kratz, A. Nähler, U. Rieth +14 · 1 citation
Physics and Astronomy · Medicine · #Nuclear physics research studies #Radioactive Decay and Measurement Techniques #Radiopharmaceutical Chemistry and Applications
paper · doi:10.1524/ract.91.1.59.19010
openalex publication_date 2003/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/02
Summary 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 %.