Three decays of the nuclide 269 Hs were observed by Hofmann et al. [1,2] as grand daughter of 277 112. The deduced relatively long half-life of about 10 s makes 269 Hs an ideal candidate for first chemical experiments with hassium (element 108). 269 Hs can be produced directly in the reaction 248 Cm ( 26 Mg, 5n). In the 4n de-excitation channel, the new nuclide 270 Hs is produced, which was predicted to be the next heavier “doubly-magic” nucleus after 208 Pb . Its decay properties are of great interest to nuclear physics. In order to investigate the chemical properties of Hs, the gas chromatographic separation system IVO (In situ Volatilization and On-line detection)  and the cryo on-line detector (COLD)  were set up at the rotating target- and window irradiation facility of the UNILAC at GSI Darmstadt. Hs is expected to belong to group 8 of the periodic table of the elements and should thus form very volatile HsO4 molecules. Test experiments with short-lived Os isotopes, the lighter homologue element of Hs, showed that OsO4 molecules were formed when the recoiling Os nuclei were stopped in a mixture of He and O2. In the course of the experiment, data was collected during 64.2 h and a beam integral of 1.0×10 18 26 Mg ions was accumulated. The count rate in all detectors was very low. Only the nuclide
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