Decay properties of nuclei . . .

The goal of the research conducted in the frame of this thesis was to investigate the decay properties of the nuclides 269−271Hs and their daughters using an improved chemical separation and detection system. Shell stabilization was predicted in the region around Z = 108 and N = 162 in calculations, taking into account possible higher orders of deformations of the nuclei. The nucleus 270Hs with a closed proton and a closed neutron deformed shell, was pre-dicted to be “deformed doubly magic”. Nuclei around 270Hs can be produced only via fusion reactions at picobarn levels, resulting in a production rates of few atoms per day. 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. Chemical separation of Hs in the form of HsO4 provides an excellent tool to study the formation reactions and nuclear structure in this region of the chart o