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and Au surfaces in preparation for chemical investigations on Cn, Nh, and Fl at TASCALens, L.*; Yakushev, A.*; D
llmann, Ch. E.*; Asai, Masato; Ballof, J.*; Block, M.*; David, H. M.*; Despotopulos, J.*; Di Nitto, A.*; Eberhardt, K.*; et al.
Radiochimica Acta, 106(12), p.949 - 962, 2018/12
Times Cited Count：14 Percentile：71.97(Chemistry, Inorganic & Nuclear)Online gas-solid adsorption studies with single atom quantities of Hg, Tl, and Pb on SiO and Au surfaces were carried out using short-lived radioisotopes with half-lives in the range of 4-49 s. This is a model study to measure adsorption enthalpies of superheavy elements Cn, Nh, and Fl. The short-lived isotopes were produced and separated by the gas-filled recoil separator TASCA at GSI. The products were stopped in He gas, and flushed into gas chromatography columns made of Si detectors whose surfaces were covered by SiO or Au. The short-lived Tl and Pb were successfully measured by the Si detectors with the SiO surface at room temperature. On the other hand, the Hg did not adsorb on the SiO surface, but adsorbed on the Au surface. The results demonstrated that the adsorption properties of short-lived Hg, Tl, and Pb could be studied with this setup, and that this method is applicable to the experiment for Cn, Nh, and Fl.
Chiera, N. M.
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Chiera, N. M.
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Sato, Tetsuya
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Elements in the heavy region of the periodic table, with atomic numbers exceeding 100, are subject to significant relativistic effects on their electron orbitals due to their large nuclear charge. This might cause their chemical properties to deviate from periodic trends. However, these heavy and superheavy elements (SHEs) can only be synthesized through heavy-ion nuclear reactions, and the resulting nuclides are all short-lived radioisotopes. Therefore, only one or a few atoms can be handled at a time, leaving many aspects of their chemical properties unveiled. At the Japan Atomic Energy Agency (JAEA), we have been studying to clarify the chemical properties of these heavy and superheavy elements to better understand the role of relativistic effects. Our research combines radiochemical techniques with online methods, such as rapid chemical separation techniques in both gas and liquid phases. By integrating an online isotope separation technique, we have achieved notable progress. The presentation will provide an overview of the results obtained at JAEA to date, along with a discussion of our future plans, including the use of new approaches such as ion trap chemistry.
