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Journal Articles

Fluoride complexation of element 104, rutherfordium (Rf), investigated by cation-exchange chromatography

Ishii, Yasuo; Toyoshima, Atsushi; Tsukada, Kazuaki; Asai, Masato; Tome, Hayato; Nishinaka, Ichiro; Nagame, Yuichiro; Miyashita, Sunao*; Mori, Tomotaka*; Suganuma, Hideo*; et al.

Chemistry Letters, 37(3), p.288 - 289, 2008/03

https://doi.org/10.1246/cl.2008.288
 Times Cited Count：20 Percentile：55.03(Chemistry, Multidisciplinary)

We have investigated cation-exchange behavior of Rf together with the lighter homologues of the group-4 elements Zr and Hf, and the tetravalent pseudo-homologue Th, in HF/HNO$$_{3}$$ solution using Automated Ion exchange separation apparatus coupled with the Detection system for Alpha spectroscopy (AIDA). The ${it K}$ $$_{d}$$ values of Zr, Hf, Th and Rf in HF/0.1 M HNO$$_{3}$$ were decreased with increasing the concentration of the fluoride ion [F$$^{-}$$], indicating the formation of the fluoride complexes. The sequence of the fluoride complexation strength is Zr $$sim$$ Hf $$>$$ Rf $$>$$ Th.

Journal Articles

Hexafluoro complex of rutherfordium in mixed HF/HNO$$_{3}$$ solutions

Toyoshima, Atsushi; Haba, Hiromitsu*; Tsukada, Kazuaki; Asai, Masato; Akiyama, Kazuhiko*; Goto, Shinichi*; Ishii, Yasuo; Nishinaka, Ichiro; Sato, Tetsuya; Nagame, Yuichiro; et al.

Radiochimica Acta, 96(3), p.125 - 134, 2008/03

https://doi.org/10.1524/ract.2008.1474
 Times Cited Count：28 Percentile：85.1(Chemistry, Inorganic & Nuclear)

Formation of an anionic fluoride-complex of element 104, rutherfordium (Rf) produced in the $$^{248}$$Cm($$^{18}$$O,5n)$$^{261}$$Rf reaction was studied by an anion-exchange method based on an atom-at-a-time scale. It was found that the hexafluoro complex of Rf, [RfF$$_{6}$$]$$^{2-}$$, was formed in the studied fluoride ion concentrations of 0.0005 - 0.013 M. Formation of [RfF$$_{6}$$]$$^{2-}$$ was significantly different from that of the homologues Zr and Hf, [ZrF$$_{6}$$]$$^{2-}$$ and [HfF$$_{6}$$]$$^{2-}$$; the evaluated formation constant of [RfF$$_{6}$$]$$^{2-}$$ is at least one-order of magnitude smaller than those of [ZrF$$_{6}$$]$$^{2-}$$ and [HfF$$_{6}$$]$$^{2-}$$.

Journal Articles

Chemical studies on rutherfordium (Rf) at JAERI

Nagame, Yuichiro; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Akiyama, Kazuhiko; Ishii, Yasuo; Sato, Tetsuya; Hirata, Masaru; Nishinaka, Ichiro; Ichikawa, Shinichi; et al.

Radiochimica Acta, 93(9-10), p.519 - 526, 2005/00

https://doi.org/10.1524/ract.2005.93.9-10.519
 Times Cited Count：30 Percentile：87.1(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Fluoride complexation of element 104, rutherfordium

Haba, Hiromitsu*; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Akiyama, Kazuhiko; Nishinaka, Ichiro; Hirata, Masaru; Yaita, Tsuyoshi; Ichikawa, Shinichi; Nagame, Yuichiro; et al.

Journal of the American Chemical Society, 126(16), p.5219 - 5224, 2004/04

https://doi.org/10.1021/ja031824u
 Times Cited Count：43 Percentile：72.51(Chemistry, Multidisciplinary)

Fluoride complexation of element 104, rutherfordium (Rf), produced in the $$^{248}$$Cm($$^{18}$$O,5n)$$^{261}$$Rf reaction has been studied by anion-exchange chromatography on an atom-at-a-time scale. The anion-exchangechromatographic behavior of Rf was investigated in 1.9-13.9 M hydrofluoric acid together with those of the group-4 elements Zr and Hf produced in the $$^{18}$$O-induced reactions on Ge and Gd targets, respectively. It was found that the adsorption behavior of Rf on anion-exchange resin is quite different from those of Zr and Hf, suggesting the influence of relativistic effect on the fluoride complexation of Rf.

Journal Articles

Chemical studies of the heaviest elements

Nagame, Yuichiro; Haba, Hiromitsu*; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Goto, Shinichi*; Akiyama, Kazuhiko; Kaneko, Tetsuya; Sakama, Minoru*; Hirata, Masaru; et al.

Nuclear Physics A, 734, p.124 - 135, 2004/04

https://doi.org/10.1016/j.nuclphysa.2004.01.021
 Times Cited Count：11 Percentile：56.88(Physics, Nuclear)

no abstracts in English

Journal Articles

Transactinide nuclear chemistry at JAERI

Nagame, Yuichiro; Haba, Hiromitsu; Tsukada, Kazuaki; Asai, Masato; Akiyama, Kazuhiko; Hirata, Masaru; Nishinaka, Ichiro; Ichikawa, Shinichi; Nakahara, Hiromichi; Goto, Shinichi*; et al.

Czechoslovak Journal of Physics, 53, p.A299 - A304, 2003/00

https://doi.org/10.1007/s10582-003-0038-3
 Times Cited Count：7 Percentile：46.52(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Decay studies of neutron-deficient Am, Cm, and Bk nuclei using an on-line isotope separator

Asai, Masato; Sakama, Minoru*; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi*; Akiyama, Kazuhiko; Toyoshima, Atsushi; et al.

Journal of Nuclear and Radiochemical Sciences, 3(1), p.187 - 190, 2002/06

https://doi.org/10.14494/jnrs2000.3.187

EC and $$alpha$$ decays of neutron-deficient americium, curium, and berkelium nuclei have been studied using the JAERI on-line isotope separator. Decay schemes of $$^{235, 236}$$Am have been established for the first time, and proton-neutron configurations in $$^{235, 236}$$Am and $$^{235, 236}$$Pu have been determined. $$alpha$$ transitions observed in $$^{233, 235}$$Am were found to be the favored transitions between the $$pi 5/2^{-}[523]$$ Nilsson states. $$Q_{alpha}$$ values of $$^{237, 238}$$Cm have been determined. Nuclear structure, deformation, and atomic masses for these nuclei were discussed.

Journal Articles

Anion-exchange behavior of Rf in HCl and HNO$$_{3}$$ solutions

Haba, Hiromitsu; Tsukada, Kazuaki; Asai, Masato; Goto, Shinichi*; Toyoshima, Atsushi; Nishinaka, Ichiro; Akiyama, Kazuhiko; Hirata, Masaru; Ichikawa, Shinichi; Nagame, Yuichiro; et al.

Journal of Nuclear and Radiochemical Sciences, 3(1), p.143 - 146, 2002/06

https://doi.org/10.14494/jnrs2000.3.143

We have investigated the sorption behavior of element 104 rutherfordium (Rf) on an anion exchange resin from HCl and HNO$$_{3}$$ solutions. In the HCl experiments, the distribution coefficients of Rf increase with an increase of HCl concentration from 7.0 M to 11.5 M, indicating that anionic species such as [Rf(OH)Cl$$_{5}$$]$$^{2-}$$ or [RfCl$$_{6}$$]$$^{2-}$$ are formed. This sorption behavior of Rf is typical of the group-4 elements Zr and Hf, and is quite different from that of the pseudo-homologue Th. It is also noted that the distribution coefficients decrease in the order Rf, Zr, Hf at 9.0 M HCl, which is consistent with the expected order of ionic radii. On the other hand, Rf appears to behave like Zr and Hf in 8 M HNO$$_{3}$$ not like Pu and Th.

Journal Articles

Production cross sections of $$^{261}$$Rf and $$^{262}$$Db in bombardments of $$^{248}$$Cm with $$^{18}$$O and $$^{19}$$F ions

Nagame, Yuichiro; Asai, Masato; Haba, Hiromitsu; Goto, Shinichi*; Tsukada, Kazuaki; Nishinaka, Ichiro; Nishio, Katsuhisa; Ichikawa, Shinichi; Toyoshima, Atsushi*; Akiyama, Kazuhiko*; et al.

Journal of Nuclear and Radiochemical Sciences, 3(1), p.85 - 88, 2002/06

https://doi.org/10.14494/jnrs2000.3.85

no abstracts in English

Journal Articles

Startup of transactinide chemistry in JAERI

Haba, Hiromitsu; Tsukada, Kazuaki; Asai, Masato; Nishinaka, Ichiro; Sakama, Minoru*; Goto, Shinichi*; Hirata, Masaru; Ichikawa, Shinichi; Nagame, Yuichiro; Kaneko, Tetsuya*; et al.

Radiochimica Acta, 89(11-12), p.733 - 736, 2002/02

https://doi.org/10.1524/ract.2001.89.11-12.733
 Times Cited Count：14 Percentile：68.97(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Calibration and interpretation of Moessbauer isomer shift of the 81-keV transition in $$^{133}$$Cs

*; *; *; *; *; *; *; *; Muto, Suguru*; Koizumi, Mitsuo; et al.

Physical Review B, 58(17), p.11313 - 11321, 1998/11

https://doi.org/10.1103/PhysRevB.58.11313
 Times Cited Count：5 Percentile：32.45(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Determination of the change of nulcear charge radias in the 81keV transition of $$^{133}$$Cs by implantation

*; *; *; *; *; *; Koizumi, Mitsuo; Osa, Akihiko; Sekine, Toshiaki; *; et al.

KURRI-TR, 0, p.102 - 106, 1996/02

no abstracts in English

Journal Articles

Moessbauer and conversion-electron measurements of $$^{133}$$Xe-implanted sources for the determination of the change of nuclear charge radius in the 81keV transition of $$^{133}$$Cs

*; *; *; Miura, Taichi*; Koizumi, Mitsuo; Osa, Akihiko; Sekine, Toshiaki; *; *; *; et al.

Hyperfine Interactions (C), p.396 - 399, 1996/01

no abstracts in English

Journal Articles

Moessbauer spectroscopic study on glaze of pottery

*; *; *; *; Nakahara, Hiromichi*; Nakada, Masami; Saeki, Masakatsu; Aratono, Yasuyuki

Hyperfine Interactions, 91, p.645 - 649, 1994/00

https://doi.org/10.1007/BF02064584
 Times Cited Count：2 Percentile：20.81(Physics, Atomic, Molecular & Chemical)

no abstracts in English

JAEA Reports

Integration study (IV) for performance assessment system of geological disposal

Yanagisawa, Ichiro*; Ezaki, Masahiro*; Ishihara, Yoshinao*; Fusaeda, Shigeki*; Mukai, Satoru*; Doi, Hideo*; Maeda, Kazuto*; Nakahara, Yutaka*

PNC TJ1214 93-001, 544 Pages, 1993/03

PNC-TJ1214-93-001.pdf:16.47MB

None

JAEA Reports

None

Ikeda, Yasuhiro*; Ishihara, Yoshinao*; *; *; *; Mukai, Satoru*; *

PNC TJ1214 92-002, 1340 Pages, 1992/02

PNC-TJ1214-92-002.pdf:31.34MB

None

Journal Articles

Chemical states of $$^{57}$$Fe-atoms after EC-decay of $$^{57}$$Co-labelled Co(BrO$$_{3}$$)$$_{2}$$$$cdot$$6H$$_{2}$$O studied by coincidence Moessbauer spectroscopy

Nakada, Masami; *; Nakahara, Hiromichi*; *

Hyperfine Interactions, 70, p.1241 - 1244, 1992/00

https://doi.org/10.1007/BF02397554
 Times Cited Count：2 Percentile：17.67(Physics, Atomic, Molecular & Chemical)

no abstracts in English

Journal Articles

Development of a computer-controlled on-line rapid ion-exchange separation system

Tsukada, Kazuaki*; Otsuki, Tsutomu*; Sueki, Keisuke*; *; *; *; Nakahara, Hiromichi*; Shinohara, Nobuo; ; Usuda, Shigekazu; et al.

Radiochimica Acta, 51(2), p.77 - 84, 1990/00

https://doi.org/10.1524/ract.1990.51.2.77

no abstracts in English

JAEA Reports

Conceptual design study of fusion experimental reactor (FY86 FER); Plant system design

*; *; *; *; Adachi, Junichi*; *; *; Nakazawa, Ichiro*; *; *; et al.

JAERI-M 87-091, 374 Pages, 1987/08

JAERI-M-87-091.pdf:8.07MB

no abstracts in English

Oral presentation

Development on the purification technology in crystallization process, 3; Generation experiments of cesium plutonium nitrate

Nakahara, Masaumi; Tomita, Yutaka; Nomura, Kazunori; Washiya, Tadahiro

no journal, , 

Concerning the purification technology of UNH crystallization, cesium plutonium nitrate was obtained and was estimated by colorimetry, XRD, TG data. These experiments show cesium plutonium nitrate product increases with nitric acid concentration in the solution. This complex of XRD patterns was almost agreed with Cs$$_{2}$$U(NO$$_{3}$$)$$_{6}$$ of that. When Cs$$_{2}$$Pu(NO$$_{3}$$)$$_{6}$$ is heated for short periods, no change occurs up to 100 degrees C, after plutonium is oxidized to Cs$$_{2}$$PuO$$_{2}$$(NO$$_{3}$$)$$_{4}$$ above 245 degrees C. This observed mass loss step for TG curve of cesium plutonium nitrate was about 10%.

22 (Records 1-20 displayed on this page)