2003 Fiscal Year Final Research Report Summary
Single Atom Chemistry for Heavy Elements (Redox Reaction of Nobelium)
| Project/Area Number |
14340207
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic chemistry
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| Research Institution | Osaka University |
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Principal Investigator |
SHINOHARA Atsushi Osaka University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (60183050)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIMURA Takashi Osaka University, Graduate School of Science, Research Associate, 大学院・理学研究科, 助手 (90323336)
SATO Wataru Osaka University, Graduate School of Science, Research Associate, 大学院・理学研究科, 助手 (90333319)
TAKAHASHI Naruto Osaka University, Graduate School of Science, Research Associate, 大学院・理学研究科, 助手 (00197162)
OHTSUKI Tsutomu Tohoku University, Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (50233193)
NAGAME Yuichiro Japan Atomic Energy Research Institute, the Advanced Science Research Center, Group Leader, 先端基礎研究センター, グループリーダー (80354885)
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| Project Period (FY) |
2002 – 2003
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| Keywords | Heavy Elements / Nobelium / Trasactinides / Heavy Actinides / Rapid Chemistry / Single Atom Chemistry / Solvent Extraction |
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| Research Abstract |
The chemical properties of heavy elements beyond mendelevium (_<101>Md) have not well been known. These superheavy elements are available in quantities of only a few atoms at a time throughout the experiments, due to their short-lives and their extremely small production rates with a heavy-ion accelerator. Therefore, rapid and efficient radiochemical procedures must be employed, in which each of the available atoms rapidly reaches equilibrium through many of the same reactions. Gas-jet transport system, combined with the following chemical separation system using a chromatographical technique, is commonly adopted for the accelerator online chemistry of superheavy elements.
The purposes of the present study are to construct the chemical apparatus applicable to more flexible chemical treatments and to find a best condition of on-line chemistry for heavy actinides. We also attempted to measure the ionic radius of No3+ by a cation-exchange chromatography with an a-hydroxyisobutyrate fluent and a PbO2 oxidant at the JAERI Tandem accelerator, in order to reveal the influence of the relativistic effect on an actinide contraction. The development of three types of chemical reaction cells (or columns) and a new liquid scintillation counter system for on-line a-ray measurements are in progress at present.
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