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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Kernphysik / Spektroskopie
HK 52.4: Vortrag
Donnerstag, 15. März 2007, 17:45–18:00, B
Doubly Magic Nucleus 108270Hs102 — •Jan Dvorak1, Willy Brüchle2, Christoph Düllmann2, Reiner Krücken1, Matthias Schädel2, Andreas Türler1, and Alexander Yakushev1 — 1Technische Universität München, D-85748 Garching, Germany — 2Gesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, Germany
Investigating short-lived nuclei using rapid chemical separation and subsequent on-line detection methods provides an independent and alternative means to electromagnetic on-line separators. The predicted enhanced stability around 270Hs has mayor importance for the experimental investigation of super heavy elements by chemical means. Chemical separation of Hs in the form of HsO4 provides an excellent tool to study the formation reactions and nuclear structure of nuclei close to the deformed nuclear shells at Z=108 and N=162 due to a high overall efficiency and a very high purification factor.
Here we report on results of a recent Hs chemistry experiments performed at GSI Darmstadt. Element 108, hassium, was produced in the reaction 248Cm(26Mg, xn)274−xnHs and chemically isolated. After gas phase separation of HsO4, 26 genetically linked decay chains have been observed. These were attributed to the decays of three different Hs isotopes - 269Hs in 5n, 270Hs in 4n, and 271Hs in 3n evaporation channel. The observed decay properties provide strong indications for enhanced stability in this area of the heaviest known elements and are in agreement with theoretical predictions. New decay properties for these Hs isotopes and their daughters are discussed.