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1. Relativistic coupled cluster calculations of the electron affinity and ionization potentials of lawrencium

Author

Guo, Yangyang, Pašteka, Lukáš F, Nagame, Yuichiro, Sato, Tetsuya K., Eliav, Ephraim, Reitsma, Marten L., and Borschevsky, Anastasia

Subjects
Physics - Atomic Physics
Abstract

The calculations of the first and the second ionization potentials of lawrencium and lutetium and the electron affinity of lawrencium are performed within the relativistic coupled cluster framework. These results are corrected by including the contributions of extrapolation to the complete basis set limit and higher order contributions due to relativity and electron correlation. The excellent agreement between our predictions of the ionization potentials of Lu and Lr and experimental values supports the accuracy of our predictions of the second ionization potential and the electron affinity of Lr.

Published
2024

5. Corrigendum to: Application of a novel gas phase synthesis approach to carbonyl complexes of accelerator-produced 5d transition metals (Radiochim. Acta 2022; 110 (2): 75–86)

Author

Götz, Michael, primary, Yakushev, Alexander, additional, Götz, Stefan, additional, Di Nitto, Antonio, additional, Düllmann, Christoph E., additional, Asai, Masato, additional, Chiera, Nadine M., additional, Kindler, Birgit, additional, Krier, Jörg, additional, Lommel, Bettina, additional, Nagame, Yuichiro, additional, Sato, Tetsuya K., additional, Suzuki, Hayato, additional, Tomitsuka, Tomohiro, additional, Tokoi, Katsuyuki, additional, Toyoshima, Atsushi, additional, and Tsukada, Kazuaki, additional

Published
2023
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9. In situ synthesis of volatile carbonyl complexes with short-lived nuclides

Author

Even, Julia, Ackermann, Dieter, Asai, Masato, Block, Michael, Brand, Holger, Di Nitto, Antonio, Düllmann, Christoph E., Eichler, Robert, Fan, Fangli, Haba, Hiromitsu, Hartmann, Willi, Hübner, Annett, Heßberger, Fritz P., Huang, Minqhiu, Jäger, Egon, Kaji, Daiya, Kanaya, Jumpei, Kaneya, Yusuke, Khuyagbaatar, Jadambaa, Kindler, Birgit, Kratz, Jens V., Krier, Jörg, Kudou, Yuki, Kurz, Nikolaus, Laatiaoui, Mustapha, Lommel, Bettina, Maurer, Joachim, Miyashita, Sunao, Morimoto, Kouji, Morita, Kosuke, Murakami, Masashi, Nagame, Yuichiro, Nitsche, Heino, Ooe, Kazuhiro, Qin, Zhi, Sato, Tetsuya K., Schädel, Matthias, Steiner, Jutta, Sumita, Takayuki, Takeyama, Mirei, Tanaka, Kengo, Toyoshima, Atsushi, Tsukada, Kazuaki, Türler, Andreas, Usoltsev, Ilya, Wakabayashi, Yasuo, Wang, Yang, Wiehl, Norbert, Yakushev, Alexander, and Yamaki, Sayaka

Published
2015
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10. Application of a novel gas phase synthesis approach to carbonyl complexes of accelerator-produced 5d transition metals

Author

Götz, Michael, primary, Yakushev, Alexander, additional, Götz, Stefan, additional, Di Nitto, Antonio, additional, Düllmann, Christoph E., additional, Asai, Masato, additional, Kindler, Birgit, additional, Krier, Jörg, additional, Lommel, Bettina, additional, Nagame, Yuichiro, additional, Sato, Tetsuya K., additional, Suzuki, Hayato, additional, Tomitsuka, Tomohiro, additional, Tokoi, Katsuyuki, additional, Toyoshima, Atsushi, additional, and Tsukada, Kazuaki, additional

Published
2021
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11. Study of fission using multi-nucleon transfer reactions

Author

Nishio Katsuhisa, Hirose Kentaro, Vermeulen Mark, Makii Hiroyuki, Orlandi Riccardo, Tsukada Kazuaki, Asai Masato, Toyoshima Atsushi, Sato Tetsuya K., Nagame Yuichiro, Chiba Satoshi, Aritomo Yoshihiro, Tanaka Shouya, Ohtsuki Tsutomu, Tsekhanovich Igor, Petrache Costel M., and Andreyev Andrei

Subjects
Physics, QC1-999
Abstract

Multi-nucleon transfer channels of the reactions of 18O+232Th, 18O+238U, 18O+248Cm were used to measure fission-fragment mass distribution for various nuclides and their excitation energy dependence. Predominantly asymmetric fission is observed at low excitation energies for all the studied cases, with an increase of the symmetric fission towards high excitation energies. Experimental data are compared with predictions of the fluctuation-dissipation model, where effects of multi-chance fission (neutron evaporation prior to fission) was introduced. It was shown that a reliable understanding of the observed fission fragment mass distributions can be obtained only invoking multi-chance fissions.

Published
2018
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12. Chemical Characterization of a Volatile Dubnium Compound, DbOCl 3

Author

Chiera, Nadine M., primary, Sato, Tetsuya K., additional, Eichler, Robert, additional, Tomitsuka, Tomohiro, additional, Asai, Masato, additional, Adachi, Sadia, additional, Dressler, Rugard, additional, Hirose, Kentaro, additional, Inoue, Hiroki, additional, Ito, Yuta, additional, Kashihara, Ayuna, additional, Makii, Hiroyuki, additional, Nishio, Katsuhisa, additional, Sakama, Minoru, additional, Shirai, Kaori, additional, Suzuki, Hayato, additional, Tokoi, Katsuyuki, additional, Tsukada, Kazuaki, additional, Watanabe, Eisuke, additional, and Nagame, Yuichiro, additional

Published
2021
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13. Inside Back Cover: Chemical Characterization of a Volatile Dubnium Compound, DbOCl 3 (Angew. Chem. Int. Ed. 33/2021)

Author

Chiera, Nadine M., primary, Sato, Tetsuya K., additional, Eichler, Robert, additional, Tomitsuka, Tomohiro, additional, Asai, Masato, additional, Adachi, Sadia, additional, Dressler, Rugard, additional, Hirose, Kentaro, additional, Inoue, Hiroki, additional, Ito, Yuta, additional, Kashihara, Ayuna, additional, Makii, Hiroyuki, additional, Nishio, Katsuhisa, additional, Sakama, Minoru, additional, Shirai, Kaori, additional, Suzuki, Hayato, additional, Tokoi, Katsuyuki, additional, Tsukada, Kazuaki, additional, Watanabe, Eisuke, additional, and Nagame, Yuichiro, additional

Published
2021
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14. Innenrücktitelbild: Chemical Characterization of a Volatile Dubnium Compound, DbOCl 3 (Angew. Chem. 33/2021)

Author

Chiera, Nadine M., primary, Sato, Tetsuya K., additional, Eichler, Robert, additional, Tomitsuka, Tomohiro, additional, Asai, Masato, additional, Adachi, Sadia, additional, Dressler, Rugard, additional, Hirose, Kentaro, additional, Inoue, Hiroki, additional, Ito, Yuta, additional, Kashihara, Ayuna, additional, Makii, Hiroyuki, additional, Nishio, Katsuhisa, additional, Sakama, Minoru, additional, Shirai, Kaori, additional, Suzuki, Hayato, additional, Tokoi, Katsuyuki, additional, Tsukada, Kazuaki, additional, Watanabe, Eisuke, additional, and Nagame, Yuichiro, additional

Published
2021
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15. Study of fission using multi-nucleon transfer reactions

Author

Nishio Katsuhisa, Hirose Kentaro, Mark Vermeulen, Makii Hiroyuki, Orlandi Riccardo, Tsukada Kazuaki, Asai Masato, Toyoshima Atsushi, Sato Tetsuya K., Nagame Yuichiro, Chiba Satoshi, Aritomo Yoshihiro, Tanaka Shouya, Ohtsuki Tsutomu, Tsekhanovich Igor, Petrache Costel M., and Andreyev Andrei

Subjects
Physics, QC1-999
Abstract

It is shown that multi-nucleon transfer reaction is a powerful tool to study fission of exotic neutronrich actinide nuclei, which cannot be accessed by particle-capture or heavy-ion fusion reactions. In this work, multi-nucleon transfer channels of the reactions of 18O+232Th, 18O+238U, 18O+248Cm, and 18O+237Np were used to measure fission-fragment mass distribution for each transfer channel. Predominantly asymmetric fission is observed at low excitation energies for all the studied cases, with an increase of the symmetric fission towards high excitation energies. Experimental data are compared with predictions of the fluctuation-dissipation model, where effects of multi-chance fission (neutron evaporation prior to fission) was introduced. It is shown that mass-asymmetric structure remaining at high excitation energies originates from low-excited and less neutronrich excited nuclei due to higher-order chance fissions.

Published
2017
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17. Chemical properties of rutherfordium (Rf) and dubnium (Db) in the aqueous phase

Author

Nagame Yuichiro, Kratz Jens Volker, and Schädel Matthias

Subjects
Physics, QC1-999
Abstract

Recent experimental studies of the chemical characterization of the first two transactinide elements, rutherfordium (Rf) and dubnium (Db), conducted atom-at-a-time in aqueous phases are reviewed. A short description on experimental techniques based on partition methods, specifically automated rapid chemical separation systems, is also given. Perspectives for aqueous-phase chemistry experiments on heavier elements are briefly discussed.

Published
2016
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18. First ionization potential of the heaviest actinide lawrencium, element 103

Author

Sato Tetsuya K., Asai Masato, Borschevsky Anastasia, Stora Thierry, Sato Nozomi, Kaneya Yusuke, Tsukada Kazuaki, Düllmann Christoph E., Eberhardt Klaus, Eliav Ephraim, Ichikawa Shinichi, Kaldor Uzi, Kratz Jens V., Miyashita Sunao, Nagame Yuichiro, Ooe Kazuhiro, Osa Akihiko, Renisch Dennis, Runke Jörg, Schädel Matthias, Thörle-Pospiech Petra, Toyoshima Atsushi, and Trautmann Norbert

Subjects
Physics, QC1-999
Abstract

The first ionization potential (IP1) of element 103, lawrencium (Lr), has been successfully determined for the first time by using a newly developed method based on a surface ionization process. The measured IP1 value is 4.9630.080.07 eV. This value is the smallest among those of actinide elements and is in excellent agreement with the value of 4.963(15) eV predicted by state-of-the-art relativistic calculations also performed in this work. Our results strongly support that the Lr atom has an electronic configuration of [Rn]7s25f147p11/2, which is influenced by strong relativistic effects. The present work provides a reliable benchmark for theoretical calculations and also opens the way for studies on atomic properties of heavy elements with atomic number Z > 100. Moreover, the present achievement has triggered a controversy on the position of lutetium (Lu) and Lr in the Periodic Table of Elements.

Published
2016
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20. Application of a novel gas phase synthesis approach to carbonyl complexes of accelerator-produced 5d transition metals.

Author

Götz, Michael, Yakushev, Alexander, Götz, Stefan, Di Nitto, Antonio, Düllmann, Christoph E., Asai, Masato, Kindler, Birgit, Krier, Jörg, Lommel, Bettina, Nagame, Yuichiro, Sato, Tetsuya K., Suzuki, Hayato, Tomitsuka, Tomohiro, Tokoi, Katsuyuki, Toyoshima, Atsushi, and Tsukada, Kazuaki

Subjects
SUPERHEAVY elements, HEAVY elements, ATOMIC number, RADIOISOTOPES, ACCELERATOR mass spectrometry, TRANSITION metals, ISOTOPES
Abstract

In 2014 the first synthesis of a transactinide carbonyl complex – seaborgium hexacarbonyl – was reported. This was achieved in gas-phase chemical experiments in a beam-free environment behind the recoil separator GARIS. Extending this work to heavier elements requires more efficient techniques to synthesize carbonyl complexes as production rates of transactinide elements drop with increasing atomic number. A novel approach was thus conceived, which retains the benefit of a beam-free environment but avoids the physical preseparation step. The latter reduces the yields for products of asymmetric reactions such as those used for the synthesis of suitable isotopes of Sg, Bh, Hs and Mt. For this a series of experiments with accelerator-produced radioisotopes of the lighter homologues W, Re and Os was carried out at the tandem accelerator of JAEA Tokai, Japan. A newly developed double-chamber system, which allows for a decoupled recoil ion thermalization and chemical complex formation, was used, which avoids the low-efficiency physical preseparation step. Here, we demonstrate the feasibility of this newly developed method using accelerator-produced short-lived radioisotopes of the 5d homologues of the early transactinides. [ABSTRACT FROM AUTHOR]

Published
2022
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23. Chemical Characterization of a Volatile Dubnium Compound, DbOCl3.

Author

Chiera, Nadine M., Sato, Tetsuya K., Eichler, Robert, Tomitsuka, Tomohiro, Asai, Masato, Adachi, Sadia, Dressler, Rugard, Hirose, Kentaro, Inoue, Hiroki, Ito, Yuta, Kashihara, Ayuna, Makii, Hiroyuki, Nishio, Katsuhisa, Sakama, Minoru, Shirai, Kaori, Suzuki, Hayato, Tokoi, Katsuyuki, Tsukada, Kazuaki, Watanabe, Eisuke, and Nagame, Yuichiro

Subjects
SUPERHEAVY elements, CHEMICAL properties, GAS chromatography
Abstract

The formation and the chemical characterization of single atoms of dubnium (Db, element 105), in the form of its volatile oxychloride, was investigated using the on‐line gas phase chromatography technique, in the temperature range 350–600 °C. Under the exactly same chemical conditions, comparative studies with the lighter homologues of Group 5 in the Periodic Table clearly indicate the volatility sequence being NbOCl3 > TaOCl3 ≥ DbOCl3. From the obtained experimental results, thermochemical data for DbOCl3 were derived. The present study delivers reliable experimental information for theoretical calculations on chemical properties of transactinides. [ABSTRACT FROM AUTHOR]

Published
2021
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24. Chemical Characterization of a Volatile Dubnium Compound, DbOCl3.

Author

Chiera, Nadine M., Sato, Tetsuya K., Eichler, Robert, Tomitsuka, Tomohiro, Asai, Masato, Adachi, Sadia, Dressler, Rugard, Hirose, Kentaro, Inoue, Hiroki, Ito, Yuta, Kashihara, Ayuna, Makii, Hiroyuki, Nishio, Katsuhisa, Sakama, Minoru, Shirai, Kaori, Suzuki, Hayato, Tokoi, Katsuyuki, Tsukada, Kazuaki, Watanabe, Eisuke, and Nagame, Yuichiro

Subjects
SUPERHEAVY elements, CHEMICAL properties, GAS chromatography
Abstract

The formation and the chemical characterization of single atoms of dubnium (Db, element 105), in the form of its volatile oxychloride, was investigated using the on‐line gas phase chromatography technique, in the temperature range 350–600 °C. Under the exactly same chemical conditions, comparative studies with the lighter homologues of Group 5 in the Periodic Table clearly indicate the volatility sequence being NbOCl3 > TaOCl3 ≥ DbOCl3. From the obtained experimental results, thermochemical data for DbOCl3 were derived. The present study delivers reliable experimental information for theoretical calculations on chemical properties of transactinides. [ABSTRACT FROM AUTHOR]

Published
2021
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25. 超アクチノイド元素Zgeq104の溶液化学的研究

Author

Nagame, Yuichiro, Kratz, J. V., and Sch\\\'adel, M.

Abstract

Recent studies of the chemical separation and characterization experiments of the first three transactinide elements, rutherfordium (Rf), dubnium (Db), and seaborgium (Sg), conducted atom-at-a-time in liquid phases, are reviewed. A short description on experimental techniques based on partition methods, specifically automated rapid chemical separation systems, is also given. A newly developed experimental approach to investigate single atoms of the heaviest elements with an electrochemical method is introduced. Perspectives for liquid-phase chemistry experiments on heavier elements are briefly discussed.

Published
2015

29. First Ionization Potentials of Fm, Md, No, and Lr: Verification of Filling-Up of 5f Electrons and Confirmation of the Actinide Series

Author

Sato, Tetsuya K., primary, Asai, Masato, additional, Borschevsky, Anastasia, additional, Beerwerth, Randolf, additional, Kaneya, Yusuke, additional, Makii, Hiroyuki, additional, Mitsukai, Akina, additional, Nagame, Yuichiro, additional, Osa, Akihiko, additional, Toyoshima, Atsushi, additional, Tsukada, Kazuaki, additional, Sakama, Minoru, additional, Takeda, Shinsaku, additional, Ooe, Kazuhiro, additional, Sato, Daisuke, additional, Shigekawa, Yudai, additional, Ichikawa, Shin-ichi, additional, Düllmann, Christoph E., additional, Grund, Jessica, additional, Renisch, Dennis, additional, Kratz, Jens V., additional, Schädel, Matthias, additional, Eliav, Ephraim, additional, Kaldor, Uzi, additional, Fritzsche, Stephan, additional, and Stora, Thierry, additional

Published
2018
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31. Chemical studies of Fl (element 114): Heaviest chemically studied element

Author

Lens, Lotte, Yakushev, Alexander, Duellmann, Christoph, Asai, Masato, Block, Michael, David, Helena May, Despotopulos, John D., Di Nitto, Antonio, Eberhardt, Klaus, Goetz, Michael, Goetz, Stefan, Haba, Hiromitsu, Harkness-Brennan, Laura, Hessberger, Fritz-Peter, Herzberg, Rolf-Dietmar, Hinde, David, Hoffmann, Jan, Annett, Huebner, Jaeger, Egon, Judson, Daniel, Jadambaa, Khuyagbaatar, Kindler, Birgit, Konki, Joonas, Kratz, Jens Volker, Krier, Jorg, Kurz, Nikolaus, Mustapha Laatiaoui, Lahiri, Susanta, Lommel, Bettina, Maiti, Momita, Mistry, Andrew K., Mokry, Christoph, Moody, Ken, Nagame, Yuichiro, Omtvedt, Jon, Papadakis, Philippos, Pershina, Valeria, Rudolph, Dirk, Runke, Joerg, Schaedel, Matthias, Scharrer, Paul, Sato, Tetsuya, Shaughnessy, Dawn, Schausten, Brigitta, Steiner, Jutta, Thoerle-Pospiech, Petra, Trautmann, Norbert, Tsukada, Kazuaki, Uusitalo, Juha, Ward, Andrew, Wegrzecki, Maciej, Williams, Elizabeth, Wiehl, Norbert, and Yakusheva, Vera

Published
2017

32. Online chemical adsorption studies of Hg, Tl, and Pb on SiO2 and Au surfaces in preparation for chemical investigations on Cn, Nh, and Fl at TASCA

Author

Lens, Lotte, primary, Yakushev, Alexander, additional, Düllmann, Christoph Emanuel, additional, Asai, Masato, additional, Ballof, Jochen, additional, Block, Michael, additional, David, Helena May, additional, Despotopulos, John, additional, Di Nitto, Antonio, additional, Eberhardt, Klaus, additional, Even, Julia, additional, Götz, Michael, additional, Götz, Stefan, additional, Haba, Hiromitsu, additional, Harkness-Brennan, Laura, additional, Heßberger, Fritz Peter, additional, Herzberg, Rodi D., additional, Hoffmann, Jan, additional, Hübner, Annett, additional, Jäger, Egon, additional, Judson, Daniel, additional, Khuyagbaatar, Jadambaa, additional, Kindler, Birgit, additional, Komori, Yukiko, additional, Konki, Joonas, additional, Kratz, Jens Volker, additional, Krier, Jörg, additional, Kurz, Nikolaus, additional, Laatiaoui, Mustapha, additional, Lahiri, Susanta, additional, Lommel, Bettina, additional, Maiti, Moumita, additional, Mistry, Andrew K., additional, Mokry, Christoph, additional, Moody, Ken, additional, Nagame, Yuichiro, additional, Omtvedt, Jon Petter, additional, Papadakis, Philippos, additional, Pershina, Valeria, additional, Runke, Jörg, additional, Schädel, Matthias, additional, Scharrer, Paul, additional, Sato, Tetsuya, additional, Shaughnessy, Dawn, additional, Schausten, Brigitta, additional, Thörle-Pospiech, Petra, additional, Trautmann, Norbert, additional, Tsukada, Kazuaki, additional, Uusitalo, Juha, additional, Ward, Andrew, additional, Wegrzecki, Maciej, additional, Wiehl, Norbert, additional, and Yakusheva, Vera, additional

Published
2018
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33. Vacuum Chromatography of Tl on SiO 2 at the Single-Atom Level

Author

Dressler, Rugard, Vascon, Alessio, Asai, Masato, Türler, Andreas, Toyoshima, Atsushi, Mitsukai, Akina, Schädel, Matthias, Kaneya, Yusuke, Tsukada, Kazuaki, Piguet, Dave, Sato, Tetsuya K., Steinegger, Patrick, Eichler, Robert, Takeda, Shinsaku, and Nagame, Yuichiro

Subjects
540 Chemistry, 570 Life sciences, biology
Abstract

An isothermal vacuum chromatography setup for superheavy element chemistry studies was developed and tested online at the one-atom-at-a-time level. As a model system, the adsorption behavior of thallium on quartz was chosen with respect to a future chemical characterization of its superheavy homologue, element 113 (E113, Z = 113), using the described setup. Short-lived 184Tl (t1/2 = 10.1(5) s) was produced in the reaction 152Gd(35Cl, 3n)184Tl and delivered as a mass-separated ion beam to the chemistry experiment: A subsurface implantation and a subsequent fast thermal release from a metal matrix was followed by isothermal vacuum chromatography as the chemical separation stage. Single atomic species passing this chromatographic separation were finally identified by time- and energy-resolved event-by-event α-spectroscopy using a diamond-based solid-state detector. The derived adsorption enthalpy of −ΔHadsSiO2(Tl) = 158 ± 3 kJ·mol–1 significantly exceeds available data but correlates well with the adsorption of other elements studied on the same surface. The described technique enables chemical experiments with short-lived transactinide elements (t1/2 < 1 s), surpassing the rapidity of today’s state-of-the-art gas-phase experiments by at least 1 order of magnitude.

Published
2016
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34. Oxidation of element 102, nobelium, with flow electrolytic column chromatography on an atom-at-a-time scale

Author

Toyoshima, Atsushi, Kasamatsu, Yoshitaka, Tsukada, Kazuaki, Asai, Masato, Kitatsuji, Yoshihiro, Ishii, Yasuo, Toume, Hayato, Nishinaka, Ichiro, Haba, Hiromitsu, Ooe, Kazuhiro, Sato, Wataru, Shinohara, Atsushi, Akiyama, Kazuhiko, and Nagame, Yuichiro

Subjects
Chromatography -- Usage, Nobelium -- Chemical properties, Oxidation-reduction reaction -- Analysis, Chemistry
Abstract

A newly developed flow electrolytic column chromatography technique was used to successfully perform oxidation of element 102, nobelium (No), on an atom-at-a-time scale in 0.1 M [alpha]-hydroxyisobutyric acid ([alpha]-HIB) solution. The most stable ion, [No.sup.2+], was found to oxidize into [No.sup.3+] within 3 min and the oxidized No complex with [alpha]-HIB exhibited the trivalent state in the column above an applied potential of 1.0 V.

Published
2009

35. 超重元素RfとDbの水溶液化学

Author

Nagame, Yuichiro, Kratz, J. V., and Sch\\\'adel, M.

Abstract

Recent studies of the chemical separation and characterization experiments of superheavy elements, rutherfordium (Rf) and dubnium (Db), conducted atom-at-a-time in aqueous phases, are reviewed. A short description on experimental techniques based on partition methods, specifically automated rapid chemical separation systems, is also given. A newly developed experimental approach to investigate single atoms of the heaviest elements with an electrochemical method is introduced. Perspectives for aqueous-phase chemistry experiments on heavier elements are briefly discussed.

Published
2016

36. Vacuum Chromatography of Tl on SiO2 at the Single-Atom Level

Author

Steinegger, Patrick, primary, Asai, Masato, additional, Dressler, Rugard, additional, Eichler, Robert, additional, Kaneya, Yusuke, additional, Mitsukai, Akina, additional, Nagame, Yuichiro, additional, Piguet, Dave, additional, Sato, Tetsuya K., additional, Schädel, Matthias, additional, Takeda, Shinsaku, additional, Toyoshima, Atsushi, additional, Tsukada, Kazuaki, additional, Türler, Andreas, additional, and Vascon, Alessio, additional

Published
2016
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39. Extraction behavior of Mo and W from H2SO4 and HF/HCl solutions into toluene with Aliquat336: sulfate and fluoride complex formation of Mo and W towards chemical studies of seaborgium (Sg).

Author

Toyoshima, Atsushi, Mitsukai, Akina, Tsukada, Kazuaki, Ooe, Kazuhiro, Haba, Hiromitsu, Komori, Yukiko, Murakami, Masashi, Kaneya, Yusuke, Sato, Daisuke, Asai, Masato, Sato, Tetsuya K., and Nagame, Yuichiro

Subjects
MOLYBDENUM, HYDROCHLORIC acid, TUNGSTEN, SEABORGIUM, FLUORIDES
Abstract

We have studied extraction behavior of group-6 elements Mo and W to search for suitable conditions for an on-line extraction experiment of their heavier homolog, seaborgium (Sg). Batch-wise extraction of carrier-free radiotracers 93mMo and 177,179,181W were carried out from 0.10 - 8.6 M H2SO4 and 1.0 × 10−4 − 5.0 M HF/1.0 M HCl into toluene with a quaternary ammonium compound, Aliquat336. Anionic sulfate complexes of Mo and W with charge − 2 were extracted with Aliquat336 from H2SO4 solutions with concentrations of [H2SO4] > 2 M. In HF/1.0 M HCl, oxyfluoro complexes of Mo and W with charge − 1 were interpreted to be formed and extracted with Aliquat336. From these results, favorable conditions for the extraction of Sg are discussed. [ABSTRACT FROM AUTHOR]

Published
2018
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40. Online chemical adsorption studies of Hg, Tl, and Pb on SiO2and Au surfaces in preparation for chemical investigations on Cn, Nh, and Fl at TASCA

Author

Lens, Lotte, Yakushev, Alexander, Düllmann, Christoph Emanuel, Asai, Masato, Ballof, Jochen, Block, Michael, David, Helena May, Despotopulos, John, Di Nitto, Antonio, Eberhardt, Klaus, Even, Julia, Götz, Michael, Götz, Stefan, Haba, Hiromitsu, Harkness-Brennan, Laura, Heßberger, Fritz Peter, Herzberg, Rodi D., Hoffmann, Jan, Hübner, Annett, Jäger, Egon, Judson, Daniel, Khuyagbaatar, Jadambaa, Kindler, Birgit, Komori, Yukiko, Konki, Joonas, Kratz, Jens Volker, Krier, Jörg, Kurz, Nikolaus, Laatiaoui, Mustapha, Lahiri, Susanta, Lommel, Bettina, Maiti, Moumita, Mistry, Andrew K., Mokry, Christoph, Moody, Ken, Nagame, Yuichiro, Omtvedt, Jon Petter, Papadakis, Philippos, Pershina, Valeria, Runke, Jörg, Schädel, Matthias, Scharrer, Paul, Sato, Tetsuya, Shaughnessy, Dawn, Schausten, Brigitta, Thörle-Pospiech, Petra, Trautmann, Norbert, Tsukada, Kazuaki, Uusitalo, Juha, Ward, Andrew, Wegrzecki, Maciej, Wiehl, Norbert, and Yakusheva, Vera

Abstract

Online gas-solid adsorption studies with single-atom quantities of Hg, Tl, and Pb, the lighter homologs of the superheavy elements (SHE) copernicium (Cn, Z=112), nihonium (Nh, Z=113), and flerovium (Fl, Z=114), were carried out using short-lived radioisotopes. The interaction with Au and SiO2surfaces was studied and the overall chemical yield was determined. Suitable radioisotopes were produced in fusion-evaporation reactions, isolated in the gas-filled recoil separator TASCA, and flushed rapidly to an adjacent setup of two gas chromatography detector arrays covered with SiO2(first array) and Au (second array). While Tl and Pb adsorbed on the SiO2surface, Hg interacts only weakly and reached the Au-covered array. Our results contribute to elucidating the influence of relativistic effects on chemical properties of the heaviest elements by providing experimental data on these lighter homologs.

Published
2018
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41. Effects of nuclear orientation on fusion and fission in the reaction using 238U target nucleus

Author

Nishio, Katsuhisa, Ikezoe, Hiroshi, Mitsuoka, Shinichi, Nishinaka, Ichiro, Nagame, Yuichiro, Ohtsuki, Tsutomu, Hirose, Katsuhisa, Hofmann, Stefan, and CNR*09 - Second International Workshop on Compound Nuclear Reactions and Related Topics

Subjects
ddc:530, Nuclear Experiment
Abstract

Fission fragment mass distributions in the reaction of 30Si+238U were measured around the Coulomb barrier. At the above-barrier energies, the mass distribution showed a Gaussian shape. At the subbarrier energies, triple-humped distribution was observed, which consists of symmetric fission and asymmetric fission peaked at AL/AH ~ 90/178. The asymmetric fission should be attributed to quasifission from the results of the measured evaporation residue (ER) cross-sections for 30Si+238U. The cross-section for 263Sg at the abovebarrier energy agree with the statistical model calculation which assumes that the measured fission cross-section originates from fusion-fission, whereas the one for 264 Sg measured at the sub-barrier energy is smaller than the calculation, which suggests the presence of quasifission.

Published
2010

42. In situ synthesis of volatile carbonyl complexes with short-lived nuclides

Author

Even, Julia, primary, Ackermann, Dieter, additional, Asai, Masato, additional, Block, Michael, additional, Brand, Holger, additional, Di Nitto, Antonio, additional, Düllmann, Christoph E., additional, Eichler, Robert, additional, Fan, Fangli, additional, Haba, Hiromitsu, additional, Hartmann, Willi, additional, Hübner, Annett, additional, Heßberger, Fritz P., additional, Huang, Minqhiu, additional, Jäger, Egon, additional, Kaji, Daiya, additional, Kanaya, Jumpei, additional, Kaneya, Yusuke, additional, Khuyagbaatar, Jadambaa, additional, Kindler, Birgit, additional, Kratz, Jens V., additional, Krier, Jörg, additional, Kudou, Yuki, additional, Kurz, Nikolaus, additional, Laatiaoui, Mustapha, additional, Lommel, Bettina, additional, Maurer, Joachim, additional, Miyashita, Sunao, additional, Morimoto, Kouji, additional, Morita, Kosuke, additional, Murakami, Masashi, additional, Nagame, Yuichiro, additional, Nitsche, Heino, additional, Ooe, Kazuhiro, additional, Qin, Zhi, additional, Sato, Tetsuya K., additional, Schädel, Matthias, additional, Steiner, Jutta, additional, Sumita, Takayuki, additional, Takeyama, Mirei, additional, Tanaka, Kengo, additional, Toyoshima, Atsushi, additional, Tsukada, Kazuaki, additional, Türler, Andreas, additional, Usoltsev, Ilya, additional, Wakabayashi, Yasuo, additional, Wang, Yang, additional, Wiehl, Norbert, additional, Yakushev, Alexander, additional, and Yamaki, Sayaka, additional

Published
2014
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44. Measurement of the Md3+/Md2+ Reduction Potential Studied with Flow Electrolytic Chromatography

Author

Toyoshima, Atsushi, primary, Li, Zijie, additional, Asai, Masato, additional, Sato, Nozomi, additional, Sato, Tetsuya K., additional, Kikuchi, Takahiro, additional, Kaneya, Yusuke, additional, Kitatsuji, Yoshihiro, additional, Tsukada, Kazuaki, additional, Nagame, Yuichiro, additional, Schädel, Matthias, additional, Ooe, Kazuhiro, additional, Kasamatsu, Yoshitaka, additional, Shinohara, Atsushi, additional, Haba, Hiromitsu, additional, and Even, Julia, additional

Published
2013
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45. First successful ionization of Lr (Z = 103) by a surface-ionization technique

Author

Sato, Tetsuya K., primary, Sato, Nozomi, additional, Asai, Masato, additional, Tsukada, Kazuaki, additional, Toyoshima, Atsushi, additional, Ooe, Kazuhiro, additional, Miyashita, Sunao, additional, Schädel, Matthias, additional, Kaneya, Yusuke, additional, Nagame, Yuichiro, additional, Osa, Akihiko, additional, Ichikawa, Shin-ichi, additional, Stora, Thierry, additional, and Kratz, Jens Volker, additional

Published
2013
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47. Fluorido Complex Formation of Element 104, Rutherfordium (Rf)

Author

Ishii, Yasuo, primary, Toyoshima, Atsushi, additional, Tsukada, Kazuaki, additional, Asai, Masato, additional, Li, Zijie, additional, Nagame, Yuichiro, additional, Miyashita, Sunao, additional, Mori, Tomotaka, additional, Suganuma, Hideo, additional, Haba, Hiromitsu, additional, Goto, Shin-ichi, additional, Kudo, Hisaaki, additional, Akiyama, Kazuhiko, additional, Oura, Yasuji, additional, Shinohara, Atsushi, additional, Schädel, Matthias, additional, Pershina, Valeria, additional, and Kratz, Jens V., additional

Published
2011
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48. Anionic Fluoro Complex of Element 105, Db

Author

Kasamatsu, Yoshitaka, primary, Toyoshima, Atsushi, additional, Asai, Masato, additional, Tsukada, Kazuaki, additional, Li, Zijie, additional, Ishii, Yasuo, additional, Toume, Hayato, additional, Sato, Tetsuya K., additional, Kikuchi, Takahiro, additional, Nishinaka, Ichiro, additional, Nagame, Yuichiro, additional, Haba, Hiromitsu, additional, Kikunaga, Hidetoshi, additional, Kudou, Yuki, additional, Oura, Yasuji, additional, Akiyama, Kazuhiko, additional, Sato, Wataru, additional, Ooe, Kazuhiro, additional, Fujisawa, Hiroyuki, additional, Shinohara, Atsushi, additional, Goto, Shin-ichi, additional, Hasegawa, Taichi, additional, Kudo, Hisaaki, additional, Nanri, Tomohiro, additional, Araki, Mikio, additional, Kinoshita, Norikazu, additional, Yokoyama, Akihiko, additional, Fan, Fangli, additional, Qin, Zhi, additional, Düllmann, Christoph E., additional, Schädel, Matthias, additional, and Kratz, Jens V., additional

Published
2009
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50. Chloride Complexation of Zr and Hf in HCl Investigated by Extended X-ray Absorption Fine Structure Spectroscopy: Toward Characterization of Chloride Complexation of Element 104, Rutherfordium (Rf)

Author

Haba, Hiromitsu, primary, Akiyama, Kazuhiko, additional, Tsukada, Kazuaki, additional, Asai, Masato, additional, Toyoshima, Atsushi, additional, Yaita, Tsuyoshi, additional, Hirata, Masaru, additional, Sueki, Keisuke, additional, and Nagame, Yuichiro, additional

Published
2009
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