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Online chemical adsorption studies of Hg, Tl, and Pb on SiO$$_{2}$$ and Au surfaces in preparation for chemical investigations on Cn, Nh, and Fl at TASCA

TASCAを用いたCn, Nh, Fl化学実験のためのHg, Tl, PbのSiO$$_{2}$$及びAu表面に対するオンライン化学吸着研究

Lens, L.*; Yakushev, A.*; D$"u$llmann, Ch. E.*; 浅井 雅人; Ballof, J.*; Block, M.*; David, H. M.*; Despotopulos, J.*; Di Nitto, A.*; Eberhardt, K.*; Even, J.*; G$"o$tz, M.*; G$"o$tz, S.*; 羽場 宏光*; Harkness-Brennan, L.*; He${ss}$berger, F. P.*; Herzberg, R. D.*; Hoffmann, J.*; H$"u$bner, A.*; J$"a$ger, E.*; Judson, D. S.*; Khuyagbaatar, J.*; Kindler, B.*; 小森 有希子*; Konki, J.*; Kratz, J. V.*; Krier, J.*; Kurz, N.*; Laatiaoui, M.*; Lahiri, S.*; Lommel, B.*; Maiti, M.*; Mistry, A. K.*; Mokry, C.*; Moody, K.*; 永目 諭一郎; Omtvedt, J. P.*; Papadakis, P.*; Pershina, V.*; Runke, J.*; Sch$"a$del, M.*; Scharrer, P.*; 佐藤 哲也; Shaughnessy, D.*; Schausten, B.*; Th$"o$rle-Pospiech, P.*; Trautmann, N.*; 塚田 和明; Uusitalo, J.*; Ward, A.*; Wegrzecki, M.*; Wiehl, N.*; Yakusheva, V.*

Lens, L.*; Yakushev, A.*; D$"u$llmann, Ch. E.*; Asai, Masato; Ballof, J.*; Block, M.*; David, H. M.*; Despotopulos, J.*; Di Nitto, A.*; Eberhardt, K.*; Even, J.*; G$"o$tz, M.*; G$"o$tz, S.*; Haba, Hiromitsu*; Harkness-Brennan, L.*; He${ss}$berger, F. P.*; Herzberg, R. D.*; Hoffmann, J.*; H$"u$bner, A.*; J$"a$ger, 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.*; Sch$"a$del, M.*; Scharrer, P.*; Sato, Tetsuya; Shaughnessy, D.*; Schausten, B.*; Th$"o$rle-Pospiech, P.*; Trautmann, N.*; Tsukada, Kazuaki; Uusitalo, J.*; Ward, A.*; Wegrzecki, M.*; Wiehl, N.*; Yakusheva, V.*

半減期4$$sim$$49秒の短寿命同位体を用いて、水銀(Hg), タリウム(Tl), 鉛(Pb)の単一原子レベルでのSiO$$_{2}$$及びAu表面への固体吸着挙動をオンライン気相実験により調べた。超重元素Cn, Nh, Flの吸着エンタルピー測定のためのモデル実験として実施した。短寿命同位体はドイツ重イオン研究所の反跳核分離装置TASCAを用いて生成・分離した。生成核はヘリウムガス中に捕集された後、SiO$$_{2}$$あるいはAuで表面を覆われたSi検出器で作製されたガスクロマトグラフィーカラムへと導入した。短寿命Tl及びPb同位体は室温においてSiO$$_{2}$$表面に吸着し、Si検出器で測定することに成功した。一方、HgはSiO$$_{2}$$表面には吸着せず、Au表面に吸着した。この結果より、本実験のセットアップを用いることで短寿命Hg, Tl, Pb同位体の吸着特性を調べることができると証明され、この手法がCn, Nh, Flの実験にも適用できることが確認された。

Online gas-solid adsorption studies with single atom quantities of Hg, Tl, and Pb on SiO$$_{2}$$ 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$$_{2}$$ or Au. The short-lived Tl and Pb were successfully measured by the Si detectors with the SiO$$_{2}$$ surface at room temperature. On the other hand, the Hg did not adsorb on the SiO$$_{2}$$ 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.

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