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FRINAT-Matematikk og naturvitenskap

Exploring the chemistry of the heaviest elements with the automated liquid-liquid extraction system SISAK

Tildelt: kr 5,1 mill.





2005 - 2009


The principal objective is to discover and probe the chemical properties of the heaviest elements known, the transactinides.. The transactinides can only be produced artificially, since their nucleuses are unstable and will disintegrate shortly after they are produced. They are, though, a unique testing ground for our current understanding and modelling of the elements as they lie at the extreme of the known part of the periodic table of the elements. Thus, our current models about the chemical properti es of the elements can be tested to see if they breaks down for extremely heavy elements. For example, there are predictions that the relativistic part of the wave functions will become so dominant that it will change the classically predicted chemical pr operties. This project aims at investigating the chemical properties of the transactinides in the liquid phase, using our on-line and continuous liquid-liquid separation system SISAK. In the project period the focus will be aimed at extending and expand ing our investigation of rutherfordium (Z=104) and initiate work on dubnium (Z=105). The dubnium development work will be a joint effort between the SISAK collaboration and the heavy-element research-group collaboration between Lawrence Livermore National Laboratory, USA, the Flerov Laboratory of Nuclear Reactions in Dubna, Russia, and several other European laboratories. The resulting chemistry will be used both for SISAK chemistry studies of short-lived dubnium-isotopes and for searching for long-lived dubnium-isotopes at the end of the decay chains from elements 115 and 113. Work to develop a liquid-phase chemistry to study hassium (Z=108) is also intended as part of the current project. At last, an Sg experiment with a three-stage separation system will be attempted. Important new capabilities for SISAK will be developed as part of this project: Digital sampling and real-time analysis of detector pulses and simultanueous detection of both phases.


FRINAT-Matematikk og naturvitenskap

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