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硫酸-Aliquat336系におけるMoならびにWの溶媒抽出挙動; 超重元素Sgの硫酸錯体形成に向けたモデル実験

Extraction behavior of Mo and W into toluene with Aliquat336 from H$$_{2}$$SO$$_{4}$$ solution as model experiments for Sg

水飼 秋菜; 豊嶋 厚史; 金谷 佑亮; 大江 一弘*; 佐藤 大輔*; 村上 昌史*  ; 小森 有希子*; 羽場 宏光*; 浅井 雅人  ; 塚田 和明  ; 佐藤 哲也   ; 永目 諭一郎 

Mitsukai, Akina; Toyoshima, Atsushi; Kaneya, Yusuke; Oe, Kazuhiro*; Sato, Daisuke*; Murakami, Masashi*; Komori, Yukiko*; Haba, Hiromitsu*; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Nagame, Yuichiro

本研究では、シーボーギウム(Sg)の硫酸錯体形成のモデル実験として硫酸-Aliquat336系におけるMoとWの溶媒抽出挙動を調べた。理化学研究所AVFサイクロトロンにおいて半減期6.8時間の$$^{93m}$$Moを合成し、バッチ法により硫酸濃度ならびに抽出剤濃度に対する分配比の変化を調べた。また、原子力機構タンデム加速器において半減期122日の$$^{181}$$Wを合成し、化学分離した後、同様のバッチ抽出実験を行った。その結果、Mo, Wともに約5.0M以上で陰イオン硫酸錯体を急激に形成し、R$$_{2}$$MO$$_{2}$$(SO$$_{4}$$)$$_{2}$$ (R=Aliquat336, M = Mo, W)として抽出されることが分かった。この条件をSgに適応することで、その硫酸錯体形成を明らかにできると期待される。

In the present study, extraction behavior of Mo and W was studied in the sulfuric acid - Aliquat336 system as model experiments for the sulfuric complexation of Sg. In the RIKEN AVF cyclotron, batch-wise extraction experiments were performed with $$^{93m}$$Mo with a 6.8 h half-life. Similar batch experiments were carried out also with $$^{181}$$W produced in the JAEA tandem accelerator followed by chemical separation from a target material. As a result, both Mo and W form anionic sulfuric complexes at more than approximately 5 M H$$_{2}$$SO$$_{4}$$, which are extracted into the organic phase as R$$_{2}$$MO$$_{2}$$(SO$$_{4}$$)$$_{2}$$ (R = Aliquat336, M = Mo, W). It is expected that sulfuric complexation of Sg would be clarified under the present conditions.

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