Centers & Labs

RIKEN Nishina Center for Accelerator-Based Science

Superheavy Element Device Development Team

Team Leader: Kouji Morimoto (D.Sci.)
Kouji  Morimoto(D.Sci.)

A gas-filled recoil ion separator has been used as a main experimental device for the study of superheavy elements. This team is in charge of maintain, improve, develop and operate the separators and related devices. There are two gas-filled recoil ion separators installed at RILAC experimental hall. One is GARIS that is designed for symmetric reaction such as cold-fusion reaction, and the other is newly developed GARIS-II that is designed for an asymmetric reaction such as hot-fusion reaction. New elements 278Nh were produced by 70Zn + 209Bi reaction using GARIS. Further the new element search Z > 118 are preparing by using GARIS-II.

Main Research Field

Mathematical and physical sciences

Related Research Fields

Interdisciplinary science and engineering / Chemistry

Keywords

  • Superheavy Element research
  • Nuclear Experiment
  • Accelerator
  • Nuclear Chemistry
  • Detector development

Selected Publications

  1. Kaji, D., Morimoto, K., Haba, H., Wakabayashi, Y., Takeyama, M., Yamaki, S., Komori, Y., Yanou, S., Goto, S., and Morita, K.:
    "Decay Measurement of 283Cn Produced in the 238U(48Ca,3n) Reaction Using GARIS-II"
    Journal of Physical Society of Japan, 86, 085001 (2017)
  2. Kaji, D., Morita, K., Morimoto, K., Haba, H., Asai, M., Fujita, K., Gan, Z., Geissel, H., Hasebe, H., Hofmann, S., Huang, M., Komori, Y., Ma, L., Maurer, J., Murakami, M., Takeyama, M., Tokanai, F., Tanaka, T., Wakabayashi. Y., Yamaguchi, T., Yamaki, S., and Yoshida, A.,:
    "Study of the Reaction 48Ca + 248Cm → 296Lv* at RIKEN-GARIS"
    Journal of Physical Society of Japan, 86, 034201(2017)
  3. Kaji, D., and Morimoto, K.,:
    "Double-layered target and identification method of individual target correlated with evaporation residues"
    Nuclear Inst. And Methods in Physics Research, A, Vol. 792, p. 11-14 (2015)
  4. Morita, K., Morimoto, K., Kaji, D., Haba, H., Ozeki, K., Kudou, Y., Sumita, T., Wakabayashi, Y., Yoneda, A., Tanaka, K., Yamaki, S., Sakai, R., Akiyama, T., Goto, S., Hasebe, H., Huang, M., Huang, T., Ideguchi, E., Kasamatsu, Y., Katori, K., Kariya, Y., Kikunaga, H., Koura, H., Kudo, H., Mashiko, A., Mayama, K., Mitsuoka, S., Moriya, T., Murakami, M., Murayama, H., Namai, S., Ozawa, A., Sato, N., Sueki, K., Takeyama, M., Tokanai, F., Yamaguchi, T., and Yoshida, A.,:
    "New result in the Production and Decay of an Isotope, 278113, of the 113th Element"
    Journal of Physical Society of Japan, 81, 103201(2012)
  5. Kaji, D., Morimoto, K., Sato, N. Ichikawa, T., Ideguchi, E., Ozeki, K., Haba, H., Koura, H., Kudou, Y., Ozawa, A., Sumita, T., Yamaguchi, T., Yoneda, A., Yoshida, A.,and Morita, K.:
    "Production and Decay Properties of 263Hs."
    Journal of Physical Society of Japan, 78, 035003(2009).
  6. Kaji, D., Morimoto, K., Yoneda, A. Hasebe, H., Yoshida, A., Goto. S., Kudo, H.,and Morita, K.:
    "Target for the heaviest element production at RIKEN."
    Nucl. Instr. and Meth. A 590 (198) (2008).
  7. Morita, K., Morimoto, K., Kaji, D., Akiyama, T., Goto, S., Haba, H., Ideguchi, E., Katori, K., Koura, H., Kikunaga, H., Kudo, H., Ohnishi, T., Ozawa, A., Sato, N., Suda, T., Sueki, K., Tokanai, F., Yamaguchi, T., Yoneda, A., and Yoshida, A.:
    "Observation of Second Decay Chain from 278113."
    Journal of Physical Society of Japan, 76, 045001(2007).
  8. Morita, K., Morimoto, K., Kaji, D., Akiyama, T., Goto, S., Haba, H., Ideguchi, E., Katori, K., Koura, H., Kudo, H., Ohnishi, T., Ozawa, A., Suda, T., Sueki, K., Tokanai, F., Yamaguchi, T., Yoneda, A., and Yoshida, A.:
    "Experiment on Synthesis of an Isotope 277112 by 208Pb + 70Zn Reaction."
    Journal of Physical Society of Japan, 76, 043201(2007).
  9. Haba, H., Kaji, D., Kikunaga, H., Akiyama, T., Sato, N., Morimoto, K., Yoneda, A., Morita, K., Takabe, T., and Shinohara, A.:
    "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).
  10. 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).

Lab Members

Principal Investigator

Kouji Morimoto
Team Leader

Core Members

Daiya Kaji
Nishina Center Research Scientist
Satoshi Ishizawa
Junior Research Associate

Contact information

Nishina RIBF Bldg.,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan

Email: morimoto [at] riken.jp

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