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RIKEN Nishina Center for Accelerator-Based Science

Superheavy Element Production Team

Team Leader: Kosuke Morita (D.Sci.)
Kosuke  Morita(D.Sci.)

The elements with their atomic number Z>103 are called as trans-actinide or superheavy elements. The chemical properties of those elements have not yet been studied in detail. Those elements are not exist in nature therefore, they must be produced by artificially for the scientific study of those elements. In our laboratory, we have been studying the physical and chemical properties of the superheavy elements utilizing the accelerators in RIKEN and various methods of efficient production of the superheavy elements.

Research Subjects

  • Search for new superheavy elements
  • Decay spectroscopy of the heaviest nuclei
  • Study of the chemical properties of the heaviest elements
  • Study of the reaction mechanism of the fusion process (theory)

Selected Publications

  1. Kosuke Morita, Kouji Morimoto, Daiya Kaji, Takahiro Akiyama, Shin-ichi Goto, Hiromitsu Haba, Eiji Ideguchi, Kenji Katori, Hiriyuki Koura, Hidetoshi Kikunaga, Hisaaki Kudo, Testuya Ohnishi, Akira Ozawa, Nozomi Sato, Toshimi Suda, Keisuke Sueki, Fuyuki Tokanai, Takayuki Yamaguchi, Akira Yoneda, Atsushi Yoshida.:
    "Observation of Second Decay Chain from 278113"
    Journal of Physical Society of Japan, 76, 045001-1 -045001-2(2007).
  2. Kosuke Morita, Kouji Morimoto, Daiya Kaji, Takahiro Akiyama, Shin-ichi Goto, Hiromitsu Haba, Eiji Ideguchi, Kenji Katori, Hiroyuki Koura, Hisaaki Kudo, Testuya Ohnishi, Akira Ozawa, Toshimi Suda, Keisuke Sueki, Fuyuki Tokanai, Takayuki Yamaguchi, Akira Yoneda, Atsushi Yoshida.:
    "Experiment on Synthesis of an Isotope 277112 by 208Pb + 70Zn Reaction"
    Journal of Physical Society of Japan, 76, 043201-1 -043201-5(2007).
  3. Morita, K., Morimoto, K., Kaji, D., Akiyama, T., Goto, S., Haba, H., Ideguchi, E., Kanungo, R., Katori, K., Koura, H., Kudo, H., Ohnishi, T., Ozawa, A., Suda, T., Sueki, K., Xu, H., Yamaguchi, T., Yoneda, A., Yoshida, A., and Zhao, Y.-L.:
    "Experiment on the Synthesis of Element 113 in the Reaction 209Bi(70Zn,n)278113"
    Journal of Physical Society of Japan, 73, 2593-2596(2004).
  4. Morita, K., Morimoto, K., Kaji, D., Haba, H., Ozeki, K., Kudou, Y., Sato, N., Sumita, T., Yoneda, A., Ichikawa, T., Fujimori, Y., Goto, S., Ideguchi, E., Kasamatsu, Y., Katori, K., Komori, Y., Koura, H., Kudo, H., Ooe, K., Ozawa, A., Tokanai, F., Tsukada, K., Yamaguchi, T., Yoshida, A.:
    "Decay Properties of 266Bh and 262Db Produced in the 248Cm + 23Na Reaction"
    Journal of Physical Society of Japan, 78 (2009) 064201.
  5. Morita, K., Morimoto, K., Kaji, D., Haba, H., Ideguchi, E., Peter, J. C., Kanungo, R., Katori, K., Koura, H., Kudo, H., Ohnishi, T., Ozawa, A., Suda, T., Sueki, K., Tanihata, I., Xu, H., Yeremin, A. V., Yoneda, A., Yoshida, A., Zhao, Y.-L., Zheng, T., Goto, S., and Tokanai, F.:
    "Production and Decay Properties of 272111 and its Daughter Nuclei"
    Journal of Physical Society of Japan, 73, 1738-1744 (2004).
  6. H. Haba, K. Tsukada, M. Asai, A. Toyoshima, Y. Ishii, H. Toume, T. Sato, I. Nishinaka, T. Ichikawa, S. Ichikawa, Y. Nagame, W. Sato, K. Matsuo, Y. Kitamoto, Y. Tashiro, A. Shinohara, J. Saito, M. Ito, T. Ikezawa, M. Sakamaki, S. Goto, H. Kudo, H. Kikunaga, M. Arai, S. Kamataki, A. Yokoyama, K. Akiyama, K. Sueki, Y. Oura, M. Schadel, W. Bruchle, and J. V. Kratz.:
    "Extraction Behavior of Rutherfordium into Tributylphosphate from Hydrochloric Acid"
    Radiochim. Acta 95, 1-6 (2007).
  7. H. Haba, D. Kaji, H. Kikunaga, T. Akiyama, N. Sato, K. Morimoto, A. Yoneda, K. Morita, T. Takabe, and A. Shinohara.:
    "Development of Gas-jet Transport System Coupled to the RIKEN Gas-filled Recoil Ion Separator GARIS for Superheavy Element Chemistry"
    J. Nucl. Radiochem. Sci. 8, 55-58 (2007).
  8. Hiromitsu Haba, Daiya Kaji, Yukiko Komori, Yuki Kudou, Kouji Morimoto, Kosuke Morita, Kazuhiro Ooe, Kazutaka Ozeki, Nozomi Sato, Atsushi Shinohara, Akira Yoneda.:
    "RIKEN Gas-filled Recoil Ion Separator (GARIS) as a Promising Interface for Superheavy Element Chemistry -Production of Element 104, 261Rf, Using the GARIS/Gas-jet System-"
    Chemistry Letters 38, 426-427(2009).
  9. H. Haba et al.:
    "Production and decay properties of the 1.9-s isomeric state in 261Rf"
    Phys. Rev. C (2011) in press.
  10. Ooe et al.:
    "Extraction behavior of carrier-free and macro amounts of molybdenum and tungsten from HCl solution"
    Radiochimica. Acta (2011) in press.

Lab Members

Principal Investigator

Kosuke Morita
Team Leader

Core Members

Kouji Morimoto
Daiya Kaji
Nishina Center Research Scientist
Akira Yoneda
Nishina Center Technical Scientist
Yasuo Wakabayashi
Special Postdoctoral Researcher
Mirei Takeyama
Junior Research Associate

Contact information

2-1 Hirosawa,
Wako, Saitama
351-0198, Japan

Email: morita [at] ribf.riken.jp

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