Online chemical adsorption studies of Hg, Tl, and Pb on SiO and Au surfaces in preparation for chemical investigations on Cn, Nh, and Fl at TASCA

Lens, L.*; Yakushev, A.*; Dllmann, Ch. E.*; Asai, Masato  ; Ballof, J.*; Block, M.*; David, H. M.*; Despotopulos, J.*; Di Nitto, A.*; Eberhardt, K.*; Even, J.*; Gtz, M.*; Gtz, S.*; Haba, Hiromitsu*; Harkness-Brennan, L.*; Heberger, F. P.*; Herzberg, R. D.*; Hoffmann, J.*; Hbner, A.*; Jger, E.*; Judson, D. S.*; Khuyagbaatar, J.*; Kindler, B.*; Komori, Yukiko*; Konki, J.*; Kratz, J. V.*; Krier, J.*; Kurz, N.*; Laatiaoui, M.*; Lahiri, S.*; Lommel, B.*; Maiti, M.*; Mistry, A. K.*; Mokry, C.*; Moody, K.*; Nagame, Yuichiro ; Omtvedt, J. P.*; Papadakis, P.*; Pershina, V.*; Runke, J.*; Schdel, M.*; Scharrer, P.*; Sato, Tetsuya   ; Shaughnessy, D.*; Schausten, B.*; Thrle-Pospiech, P.*; Trautmann, N.*; Tsukada, Kazuaki  ; Uusitalo, J.*; Ward, A.*; Wegrzecki, M.*; Wiehl, N.*; Yakusheva, V.*

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.