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Decay properties of 269 Hs and evidence for the new nuclide 270 Hs

By A. Türler, Ch. E. Düllmann, H. W. Gäggeler, S. Soverna (univ Bern, R. Dressler, B. Eichler, F. Glaus, D. T. Jost, D. Piguet (psi, T. N. Ginter, K. E. Gregorich, U. Kirbach, D. M. Lee, R. Sudowe, H. Nitsche, J. B. Patin, P. Zielinski (uc Berkeley, W. Brüchle, R. Eichler, E. Jäger, M. Schädel, B. Schausten, E. Schimpf, H. -j. Schött, G. Wirth (gsi, S. N. Timokhin, K. Eberhardt, P. Thörle, N. Trautmann (univ Mainz, Z. Qin (imp Lanzhou and A. Vahle

Abstract

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 [3]. 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) [4] and the cryo on-line detector (COLD) [5] 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

Year: 2011
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