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Liquid-scintillation detection of preseparated 257Rf with the SISAK-system

2005; Elsevier BV; Volume: 543; Issue: 2-3 Linguagem: Inglês

10.1016/j.nima.2004.12.010

1872-9576

L. Stavsetra, Κ. Ε. Gregorich, J. Alstad, Harald Breivik, Κ. Eberhardt, C. M. Folden, T. N. Ginter, Maria Johansson, U. Kirbach, D.M. Lee, M. Mendel, L. A. Omtvedt, J. B. Patin, Gunnar Skarnemark, R. Sudowe, P. A. Wilk, P.M. Zieliński, H. Nitsche, D.C. Hoffman, J. P. Omtvedt,

Radiation Detection and Scintillator Technologies

The fast liquid–liquid extraction system SISAK with continuous liquid scintillation detection was coupled to the Berkeley Gas-filled Separator to enable studies of the chemical properties of α-decaying transactinide elements. The preseparated transactinide 257Rf (4.7 s), was transported via a He/KCl-jet directly into the scintillation solution. This permitted the first unambiguous detection of transactinide atoms by the means of the α-liquid scintillation detectors of the SISAK-system. During the experiment, 89 257Rf atoms were observed. The type of events observed correspond well with the expectations based on half-lives, decay branches and transport- and hold-up times. The successful result of this experiment demonstrates that the system is well fitted for count-rates of 1–2 atoms/h and half-lives of a few seconds.