Eur. Phys. J. A (2003) 17: 505-508
https://doi.org/10.1140/epja/i2002-10163-0

Short Note

On the decay properties of ²⁶⁹Hs and indications for the new nuclide ²⁷⁰Hs

¹ Institut für Radiochemie, TU München, D-85748, Garching, Germany
² Institut für Radiochemie, Paul Scherrer Institut, CH-5232, Villigen PSI, Switzerland
³ Department of Chemistry and Biochemistry, University of Bern, CH-3012, Bern, Switzerland
⁴ Nuclear Science Division, Lawrence Berkeley National Laboratory, CA 94720, Berkeley, USA
⁵ Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, 141980, Dubna, Moscow Region, Russia
⁶ Flerov Laboratory of Nuclear Reactions, Gesellschaft für Schwerionenforschung mbH, D-64291, Darmstadt, Germany
⁷ Institut für Kernchemie, Universität Mainz, D-55099, Mainz, Germany
⁸ Department of Chemistry, University of California, CA 94720-1460, Berkeley, USA
⁹ Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, PRC
¹⁰ Institute of Modern Physics, Research Center Rossendorf e.V., D-01314, Dresden, Germany

^* e-mail: Andreas.Tuerler@radiochemie.de

Abstract

In bombardments of ²⁴⁸Cm with 143.7-146.8 MeV ²⁶Mg ions the nuclides ²⁶⁹Hs and presumably ²⁷⁰Hs were produced. After chemical isolation, Hs atoms were identified by observing genetically linked nuclear-decay chains. Three chains originating from ²⁶⁹Hs confirmed the decay properties observed previously in the decay of ²⁷⁷112. Two chains exhibited the characteristics expected for the new nuclide ²⁷⁰Hs, which was predicted to be a deformed ”doubly magic” nucleus. From the measured $E_\alpha =9.16^{+0.07}_{-0.03}$ MeV an $\alpha$-decay half-life of 3.6^+0.8 _-1.4 s was estimated.