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MPINP:
Speichertechnik - Abteilung Blaum
Abstract:
To study the chemical properties of the heaviest elements, a fast and
efficient stopping and extraction of the highly energetic residues from
heavy ion fusion reactions into the chemistry setup is essential.
Currently used techniques like Recoil Transfer Chambers (RTC) relying on
gas flow extraction provide high efficiencies for chemically
non-reactive volatile species, but operate at extraction times t(extr)
of about 0.5 s or more. Buffer Gas Cells (BGC) with electric and
Radio-Frequency (RF) fields offer much faster extraction times. Here, we
demonstrate the successful coupling of a BGC to a gas chromatography
setup as is used for studies of chemical properties of superheavy
elements. Using Ra-223 and Ac-225 recoil ion sources providing Rn-219
and Fr-221 ions for off-line tests, an extraction time t(extr) = 55(4)
ms and an extraction efficiency of 35(3)% were achieved for the
non-reactive Rn-219, while Fr-221 was retained. The results show a
BGC-based setup to be suitable for gas-phase experiments with
short-lived volatile transactinide elements like Cn and Fl with
half-lives substantially below 1 s.
