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Sato, Tetsuya; Nagame, Yuichiro*
Radiochimica Acta, 110(6-9), p.441 - 451, 2022/07
Times Cited Count:1 Percentile:0.01(Chemistry, Inorganic & Nuclear)We describe our recent achievements in the effective production of low-energy ion-beams of the elements at the end of the actinide series, fermium (Fm, atomic number Z = 100), mendelevium (Md, Z = 101), nobelium (No, Z = 102), and lawrencium (Lr, Z = 103), using a surface ionization ion-source installed in the ISOL (Isotope Separator On-Line) at the Tandem accelerator facility of JAEA (Japan Atomic Energy Agency). Then the successful measurements of the first ionization potentials (IP) of these elements with the ISOL setup are reviewed. The measured IP values increased up to No via Fm and Md, while that of Lr was the lowest among the actinides. Based on the variation of the IP1 values of the heavy actinides with the atomic number in comparison with those of the heavy lanthanides, the results clearly demonstrated that the 5f orbitals are fully filled at No, and the actinide series ends with Lr. Furthermore, the IP value of Lr provoked controversy over its position in the Periodic Table, so a short introduction to this issue is presented. The feasibility of the extension of chemical studies to still heavier elements with their ion-beams generated by ISOL is briefly discussed.
Nagame, Yuichiro*; Sato, Tetsuya; Kratz, J. V.*
Kirk-Othmer Encyclopedia of Chemical Technology (Internet), 52 Pages, 2020/09
This article gives a brief summary of the recent progress in the synthesis of new elements as well as heavy nuclei far from the stability line and in the studies of exotic nuclear decay properties including nuclear fission of heavy nuclei and chemical characterization of heavy actinides and transactinides. Experimental techniques of single-atom detection after in-flight separation with electromagnetic separators have made a breakthrough in discovery of new heavy isotopes. Development of automated rapid chemical separation apparatuses performing one atom-at-a-time chemistry has also considerably contributed to the progress of chemical studies of the transactinides. Some key experiments exploring new frontiers of the production and chemical characterization of heavy actinides and transactinides using state-of-the-art techniques are demonstrated. A short historical perspective of actinide and transactinide elements and some prospects of extending nuclear and chemical studies of heavy elements in the future are briefly presented.
Department of Research Reactor and Tandem Accelerator
JAEA-Review 2016-025, 101 Pages, 2016/12
The JAEA-Tokai tandem accelerator complex has been used in various research fields such as nuclear science and material science by researchers not only of JAEA but also from universities, research institutes and industrial companies. This annual report covers developments of accelerators and research activities carried out using the tandem accelerator and superconducting booster from April 1, 2013 to March 31, 2014. Thirty-one summary reports were categorized into seven research/development fields:(1) accelerator operation and development, (2) nuclear structure, (3) nuclear reaction, (4) nuclear chemistry, (5) nuclear theory, (6) atomic physics and solid state physics (7) radiation effects in materials. This report also lists publications, meetings, personnel, committee members, cooperative researches and common use programs.
Iwamoto, Akira; Yoshida, Tadashi; Takeuchi, Suehiro
JAERI-Conf 2001-014, 174 Pages, 2001/11
no abstracts in English
Iwamoto, Akira; Yoshida, Tadashi; Takeuchi, Suehiro
JAERI-Conf 99-013, p.234 - 0, 2000/01
no abstracts in English
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JAERI-Conf 99-010, p.98 - 0, 1999/10
no abstracts in English
Nakahara, Hiromichi*; Nagame, Yuichiro
Nihon Genshiryoku Gakkai-Shi, 41(4), p.389 - 391, 1999/04
no abstracts in English
JAERI-M 93-174, 174 Pages, 1993/09
no abstracts in English
JAERI-M 92-124, 204 Pages, 1992/09
no abstracts in English
JAERI-M 91-170, 185 Pages, 1991/10
no abstracts in English
Kaneko, Yoshihiko; Mizumoto, Motoharu; ; Nakahara, Yasuaki; Iwamoto, Akira; Funahashi, Satoru; ; Takeda, Tatsuoki; Hoshi, Michio; Shinohara, Nobuo; et al.
JAERI-M 91-095, 137 Pages, 1991/06
no abstracts in English
JAERI-M 90-139, 230 Pages, 1990/09
no abstracts in English
JAERI-M 89-119, 224 Pages, 1989/09
no abstracts in English
JAERI-M 89-058, 342 Pages, 1989/05
no abstracts in English
; ; ; ; ; ;
JAERI-M 86-112, 222 Pages, 1986/08
no abstracts in English
Kaji, Harumi*;
Radioisotopes, 30(SPECIAL ISSUE), p.33S - 34S, 1981/00
no abstracts in English