Thursday, December 14, 2006, 16:00
WHGA Auditorium
R. Eichler, PSI
Abstract:
The chemical properties of the heaviest elements are expected to be
strongly influenced by relativistic effects in their electron structure.
These effects may limit the applicability of the laws of periodicity
depicted in the periodic table to heaviest elements. Since 1999 the
formation of about 30 new nuclides of super heavy elements -
transactinides - in the nuclear fusion reactions of Ca-48 with actinide
targets was reported at FLNR Dubna. Some of the observed isotopes, e.g.
of element 112 and 114, have half-lives in the order of some seconds.
Therefore, these elements can be studied chemically. The In-situ
Volatilization and On-line technique (IVO) was developed in combination
with the Cryo-On-Line Detector (COLD) at PSI for the gas phase chemical
investigation of short-lived volatile species. Here, we show how this
technique was successfully applied for the first chemical investigation
of Hassium and the super heavy element 112.