Centers & Labs

RIKEN Nishina Center for Accelerator-Based Science

Nuclear Spectroscopy Laboratory

Group Director: Hideki Ueno (D.Sci.)
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 Field

Mathematical and physical sciences

Related Research Fields

Interdisciplinary science and engineering

Keywords

  • 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-located 129Xe and 131Xe 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 in 3313Al20 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 of 84−87Rb 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 of 17C utilizing spin-polarized 17B”
    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 of 43S spherical?”
    Phys. Rev. Lett. 108, 162501 (2012).

Lab Members

Principal Investigator

Hideki Ueno
Group Director

Core Members

Hiroki Yamazaki
Senior Research Scientist
Yuichi Ichikawa
Senior Research Scientist
Aiko Takamine
Research Scientist
Tomoya Sato
Special Postdoctoral Researcher
Hiroki Nishibata
Visiting Researcher
Keita Kawata
Junior Research Associate
Aleksey Gladkov
International Program Associate

Contact information

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

Email: ueno [at] riken.jp

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