Objective
Fusion reactions between heavy ions and actinide targets can be used to produce very heavy elements such as the transactinides However, with present-day techniques only about 10{2} atoms of elements 104 with a half-life of about one minute and a few atoms of element 106 with a half-life of about 10 seconds can be obtained per day. The created atoms can immediately be processed by a continuous gas-solid chromatography technique using a chemically active carrier gas. Usually volatile chlorides or bromides are formed and the deposition peaks of the molecules in a thermochromatography column are determined. It is also possible to measure the retention times of the molecules in isothermal chromatography columns. Such measurements provide a tool to measure the volatility of the compounds.
Such techniques have been developed for many years by the collaborating groups involved and have served so far as a feasibility study for the planned research programme. The emphasis now is on a quantitative evaluation of differences in properties of the formed compounds with respect to those of the homologous elements in the periodic table. Final elucidation of the decay properties of the isotope 262 of element 104 is planned as well.
Thorough thermodynamical and kinetical analysis of the chemical state of the new elements in the gaseous and adsorbed states will also be performed as well as a Monte Carlo simulation of the microscopic picture of the processes involved. Model experiments with homologous lighter elements will be performed at JINR, the PSI in Switzerland and at FZR in Rossendorf, Germany. One can anticipate deviations from trends in the subgroups IV (element 104) and Vl (element 106) due to relativistic effects which are considered to be the most intriguing aspect of the chemistry of heaviest elements. Volatility data seem to be most suitable for revealing such effects.
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Programme(s)
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Coordinator
3012 Bern
Switzerland
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.