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RIKEN Nishina Center for Accelerator-Based Science Nuclear Spectroscopy Laboratory

Director: Hideki Ueno (D.Sci.)

Research Summary

Hideki  Ueno(D.Sci.)

It has been revealed that far-unstable RIs (radioactive isotopes), which have an extremely high or low proton/neutron ratio as compared with naturally occurring stable nuclei, show various unique properties.
The understanding of the nuclear-structure changes and their mechanism by which such properties appear is one of the most important subjects in nuclear physics. The research group has conducted physics studies utilizing RI beams mainly at the RIBF facility. These studies are based on the technique of nuclear spectroscopy such as β-ray-detected NMR, γ-PAD (Perturbed Angular Distribution), laser, and Mössbauer among other methods. In particular, based on our own techniques and devices for the production of spin-controlled RI beams, anomalous nuclear structures and properties of far unstable nuclei are investigated through the determination of intrinsic nuclear properties such as nuclear spins, electromagnetic moments.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Interdisciplinary Science & Engineering


  • Experimental Nuclear Physics
  • Accelerator-Use Experiment
  • Radioactive-Isotope Beam
  • Radiation Measurement
  • Nuclear Spin Orientation

Selected Publications

  • 1.Ito, Y., Schury, P., Wada, M., Arai, F., Haba, H., Hirayama, Y., Ishizawa, S., Kaji, D., Kimura, S., Koura, H., MacCormick, M., Miyatake, H., Moon, J.Y., Morimoto, K., Morita, K., Mukai, M., Murray, I., Niwase, T., Okada, K., Ozawa, A., Rosenbusch, M., Takamine, A., Tanaka, T., Watanabe, Y.X., Wollnik, H., Yamaki., S.:
    “First direct mass measurements of nuclides around Z = 100 with an MRTOF-MS,”
    Phys. Rev. Lett., accepted (2018).
  • 2.T. Sato, Y. Ichikawa, S. Kojima, C. Funayama, S. Tanaka, T. Inoue, A. Uchiyama, A. Gladkov, A. Takamine, Y. Sakamoto, Y. Ohtomo, C. Hirao, M. Chikamori, E. Hikota, T. Suzuki, M. Tsuchiya, T. Furukawa, A.Yoshimi, C. P. Bidinosti, T. Ino, H. Ueno, Y. Matsuo, T. Fukuyawa, N. Yoshinaga, Y. Sakemi, K. Asahi.:
    “Development of co-located129Xe and131Xe nuclear spin masers with external feedback scheme”
    Phys. Lett. A, 382, 588 (2018).
  • 3.Schury, P., Wada, M., Ito, Y., Kaji, D., Arai, F., MacCormick, M., Murray, I., Haba, H., Jeong, S., Kimura, S., Koura, H., Miyatake, H., Morimoto, K., Morita, K., Ozawa, A., Rosenbusch, M., Reponen, M., Söderstöm, P.-A., Takamine, A., Tanaka T., and Wollnik, H.:
    “First online multireflection time-of-flight mass measurements of isobar chains produced by fusion-evaporation reactions: Toward identification of superheavy elements via mass spectroscopy”
    , Phys. Rev. C 95, 011305(R) (2017).
  • 4.Heylen, H., De Rydt, M. Neyens, G., Bissell, M.L., Caceres, L., Chevrier, R., Daugas, J.M., Ichikawa, Y., Ishibashi, Y., Kamalou, O., Mertzimekis, T.J., Morel, P., Papuga, J., Poves, A., Rajabali, M.M., Stödel, C., Thomas, J.C., Ueno, H., Utsuno, Y., Yoshida, N., and Yoshimi, A.:
    “High-precision quadrupole moment reveals significant intruder component in3313Al20 ground state”
    Phys. Rev. C 94, 034312 (2016).
  • 5.Kusoglu, A., Georgiev, G., Sotty, C., Balabanski, D.L., Goasduff, A., Ishii, Y., Abe, Y., Asahi, K., Bostan, M., Chevrier, R., Chikamori, M., Daugas, J.M., Furukawa, T., Nishibata, H., Ichikawa, Y., Ishibashi, Y., Lozeva, R., Miyatake, H., Nagae, D., Nanao, T., Niikura, M., Niwa, T., Okada, S., Ozawa, A., Saito, Y., Shirai, H., Ueno, H., Yordanov, D.T., and Yoshida N.:
    “Magnetic moment of the 13/2+ isomeric state in Cu69: Spin alignment in the one-nucleon removal reaction”
    Phys. Rev. C 93, 054313 (2016).
  • 6.Ueno, H., and Ichikawa, Y.:
    “Spin-Aligned Radioactive Isotope Beams via Two-Step Fragmentation Reaction”
    Nucl. Phys. News 25, 12−16 (2015).
  • 7.Yang, X.F., Furukawa, T., Wakui, T., Fujita, T., Imamura, K., Mitsuya, Y., Hayasaka, M., Ichikawa, Y., Ishibashi, Y., Shirai, H., Suzuki, T., Ebata, Y., Hatakeyama, A., Wada, M., Sonoda, T., Ito, Y., Kobayashi, T., Nishimura, S., Kurata-Nishimura, M., Kondo, Y., Yoneda, K., Kubono, S., Ohshiro, Y., Ueno, H., Shinozuka, T., Shimoda, T., Asahi, K., and Matsuo, Y.:
    “Laser–radio-frequency double-resonance spectroscopy of84−87Rb isotopes trapped”
    Phys. Rev. A 90, 052516, (2014).
  • 8.Ueno, H., Miyatake, H., Yamamoto, Y., Tanimoto, S., Shimoda, T., Aoi, N., Asahi, K., Ideguchi, E., Ishihara, M., Izumi, H., Kishida, T., Kubo, T., Mitsuoka, S., Mizoi, Y., Notani, M., Ogawa, H., Ozawa, A., Sasaki, M., Shirakura, T., Takahashi, N., and Yoneda, K.:
    “Beta-delayed neutron and gamma-ray spectroscopy of17C utilizing spin-polarized17B”
    Phys. Rev. C 87, 034316 (2013).
  • 9.Ichikawa, Y., Ueno, H., Ishii, Y., Furukawa, T., Yoshimi, A., Kameda, D., Watanabe, H., Aoi, N., Asahi, K., Balabanski, D.L., Chevrier, R., Daugas, J.M. , Fukuda, N., Georgiev, G., Hayashi, H., Iijima, H., Inabe, N., Inoue, T., Ishihara, M., Kubo, T., Nanao, T., Ohnishi, T., Suzuki, K., Tsuchiya, M., Takeda, H., and Rajabali, M.M.:
    “Production of spin-controlled rare isotope beams”
    Nat. Phys. 8, 918-922 (2012).
  • 10.Chevrier, R., Daugas, J.M. , Gaudefroy, L., Ichikawa, Y., Ueno, H., Hass, M., H. Haas, Cottenier, S., Aoi, N., Asahi, K., Balabanski, D.L., Fukuda, N., Furukawa, T., Georgiev, G., Hayashi, H., Iijima, H., Inabe, N., Inoue, T., Ishihara, M., Ishii, Y., Kameda, D., Kubo, T., Nanao, T., Neyens, G., Ohnishi, T., Rajabali, M.M., Suzuki, K., Takeda, H., Tsuchiya, M., Vermeulen, N., Watanabe, H., and Yoshimi, A.:
    “Is the 7/2 isomer state of43S spherical?”
    Phys. Rev. Lett. 108, 162501 (2012).

Related Links

Lab Members

Principal investigator

Hideki Ueno

Core members

Hiroki Yamazaki
Senior Research Scientist
Yuichi Ichikawa
Senior Research Scientist
Aiko Takamine
Research Scientist
Tetsu Sonoda
Research & Development Scientist
Minori Tajima
Postdoctoral Researcher
Hiroki Nishibata
Special Postdoctoral Researcher
Yukari Matsuo
Senior Visiting Scientist
Hideyuki Sakai
Senior Visiting Scientist
Keita Kawata
Junior Research Associate
Yoshio Kobayashi
Visiting Scientist
Kei Imamura
Visiting Scientist

Contact Information

315 Nishina RIBF Bldg.,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Email: ueno [at] riken.jp