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Journal Articles

Improved density functional calculations including magnetic effects for RfCl$$_{4}$$ and its homologues

Anton, J.*; Hirata, Masaru; Fricke, B.*; Pershina, V.*

Chemical Physics Letters, 380(1-2), p.95 - 98, 2003/10

https://doi.org/10.1016/j.cplett.2003.09.010
 Times Cited Count：6 Percentile：18.14(Chemistry, Physical)

We use the newly developed non collinear spin polarized density functional method to describe the tetrachlorides of element Rutherfordium (Rf) and its homologues. It is the first time that a real three-dimensional molecule is described with this method. Without any additional corrections (used so far for the atomic values) we get nearly complete agreement for all homologues and thus a good prediction for the unknown value for RfCl$$_{4}$$.

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.

Oral presentation

New additional experiments of $$alpha$$-decay spectroscopy for $$^{261}$$Rf

Asai, Masato; Tsukada, Kazuaki; Sato, Nozomi*; Sato, Tetsuya; Toyoshima, Atsushi; Ishii, Tetsuro; Miyashita, Sunao*; Kaneya, Yusuke*; Shibata, Michihiro*; Shima, Yosuke*

no journal, , 

We have performed $$alpha$$-$$gamma$$ coincidence and high-resolution $$alpha$$-fine structure spectroscopy for $$^{261}$$Rf, and have obtained new information on nuclear structure of $$^{261}$$Rf. We have confirmed the existence of two $$gamma$$ transitions following the $$alpha$$ decay, and have succeeded in determining the $$alpha$$-transition energy very accurately. On the basis of these experimental results, we have estimated the spin-parities and neutron single-particle configurations of the ground- and isomeric states of $$^{261}$$Rf, and have obtained information on the single-particle configurations and nuclear deformations for heavier superheavy nuclei.

Oral presentation

Alpha-decay spectroscopy of $$^{261}$$Rf

Asai, Masato; Tsukada, Kazuaki; Sato, Nozomi*; Sato, Tetsuya; Toyoshima, Atsushi; Ishii, Tetsuro; Miyashita, Sunao*; Kaneya, Yusuke; Shima, Yosuke*; Shibata, Michihiro*

no journal, , 

Alpha-gamma coincidence and high-resolution $$alpha$$ fine-structure measurements were performed for the $$alpha$$ decay of $$^{261}$$Rf. Two $$gamma$$ lines associated with the $$alpha$$ decay of $$^{261}$$Rf were clearly observed, and more precise $$alpha$$-energy spectrum than before were obtained. It was found that the literature value (8.28 MeV) of the $$alpha$$-transition energy of $$^{261}$$Rf was incorrect, and that the $$alpha$$-decay scheme of $$^{261}$$Rf should contain several low-energy cascade $$gamma$$ transitions. On the basis of these results and literature data of $$^{261m}$$Rf, we will discuss nuclear structure of superheavy nuclei around this region as well as the level structure of $$^{261}$$Rf and its daughter nucleus $$^{257}$$No.

Oral presentation

Alpha decay of $$^{261}$$Rf

Asai, Masato; Tsukada, Kazuaki; Sato, Nozomi*; Sato, Tetsuya; Toyoshima, Atsushi; Ishii, Tetsuro; Miyashita, Sunao*; Kaneya, Yusuke*; Shima, Yosuke*; Shibata, Michihiro*

no journal, , 

We have obtained new experimental data for nuclear structure of $$^{261}$$Rf through $$alpha$$-decay spectroscopy. We have reconfirmed existence of two $$gamma$$ transitions in the $$alpha$$ decay of $$^{261}$$Rf through $$alpha$$-$$gamma$$ coincidence measurement, and determined the $$alpha$$-transition energy very precisely through high-resolution $$alpha$$-fine structure measurement. On the basis of these experimental results, we have estimated spin-parities and neutron single-particle configurations of the ground- and isomeric states of $$^{261}$$Rf, and have obtained information on the single-particle configurations and nuclear deformations for heavier superheavy nuclei.

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