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RIKEN Nishina Center for Accelerator-Based Science Radioactive Isotope Physics Group

Director: Hiroyoshi Sakurai (D.Sc.)

Research Summary

Hiroyoshi  Sakurai

This Group conducts programs at “RI Beam Factory (RIBF)”, and explores exotic nuclear structures and dynamics in exotic nuclei with largely imbalanced proton and neutron numbers. Our aim is to develop new experimental techniques utilizing fast radioactive isotope beams at RIBF, to discover new phenomena and properties in exotic nuclei. The Laboratory is focusing three major subjects; shell evolution of very neutron-rich nuclei, the r-process path and equation-of-state in asymmetric nuclear matter. The Laboratory has initiated international collaborations for in-beam gamma spectroscopy, decay spectroscopy and heavy-ion induced reactions, and has formed a discussion forum for next generation gamma detectors.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Interdisciplinary Science & Engineering


  • Radioactive Isotope Beam
  • Exotic Nuclei
  • Gamma Spectroscopy
  • Heavy-ion induced Reactions

Selected Publications

  • 1.Wang H., Otsu H., Sakurai H., et al.:
    "Spallation reaction study for fission products in nuclear waste: Cross section measurements for Cs-137 and Sr-90 on proton and deuteron"
    Phys. Lett. B 754, 104-108 (2016)
  • 2.Shane R., McIntosh A.B., Isobe T., et al.:
    "S pi RIT: A time-projection chamber for symmetry-energy studies"
    Nucl. Instrum. Methods A 784, 513-517 (2015)
  • 3.Lorusso G., Nishimura S., et al:
    "beta-Decay Half-Lives of 110 Neutron-Rich Nuclei across the N=82 Shell Gap: Implications for the Mechanism and Universality of the Astrophysical r Process"
    Phys. Rev. Lett. 114, 192501 (2015)
  • 4.Steppenbeck D., et al.
    "Evidence for a new nuclear 'magic number' from the level structure of Ca-54"
    Nature 502, 207 (2013)
  • 5.Nishimura S., Li Z, Watanabe H., Yoshinaga K, et al.:
    "Beta-Decay Half-Lives of Very Neutron-Rich Kr to Tc Isotopes on the Boundary of the r-Process Path: An Indication of Fast r-Matter Flow"
    Phys. Rev. Lett. 106, 052502 (2011)
  • 6.Doornenbal P, Scheit H, Aoi N, Takeuchi S, et al.:
    "Spectroscopy of Ne-32 and the "Island of Inversion""
    Phys. Rev. Lett. 103, 152503 (2009)
  • 7.Suzuki D., Iwasaki H., Otsu H., et al.:
    "Breakdown of the Z=8 Shell Closure in Unbound O-12 and its Mirror Symmetry"
    Phys. Rev. Lett. 103, 152503 (2009)
  • 8.Ong, H. J., Imai, N., Suzuki D., Iwasaki H., Sakurai H., Onishi T.K., Suzuki M.K., Ota S., Takeuchi S., Nakao T., et al.:
    "Lifetime measurements of first excited states in C-16, C-18"
    Physical Review C 78, 014308 (2008)
  • 9.Yoneda K., Sakurai H. et al.:
    "Deformation of 34Mg studied via in-beam -ray spectroscopy using RI beam fragmentation"
    Physics Letters B 499, 233-237 (2001).
  • 10.Sakurai, H., Lukyanov, S.M., Notani, M., Aoi, N., Beaumel, D., Fukuda, N., Hirai, M., Ideguchi, E., Imai, N., Ishihara, M., Iwasaki, H., Kubo, T., Kusaka, K., Kumagai, H., Nakamura, T., Ogawa, H., Penionzhkevich, Yu.E., Teranishi, T., Watanabe, Y.X., Yone.:
    "Evidence for particle stability of 31F and particle instability of 25N and 28O"
    Physics Letters B 448, 180-184 (1999).

Recent Research Results

Related Links

Lab Members

Principal investigator

Hiroyoshi Sakurai

Core members

Yoichi Nakai
Senior Research Scientist
Akihisa Kohama
Senior Research Scientist
Tadaaki Isobe
Senior Research Scientist
Pieter Christiaan Doornenbal
Senior Research Scientist
Shunji Nishimura
Senior Research Scientist
Daisuke Suzuki
Research Scientist
Takashi Kishida
Visiting Scientist
Hiroshi Watanabe
Visiting Scientist
Giuseppe Lorusso
Visiting Scientist
Hiu Ching Lee
Visiting Scientist
Paer-Anders Soederstroem
Visiting Scientist
Takashi Ichihara
Special Temporary Research Scientist

Contact Information

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