Centers & Labs

RIKEN Nishina Center for Accelerator-Based Science

BigRIPS Team

Team Leader: Koichi Yoshida (D.Sci.)
Koichi  Yoshida(D.Sci.)

This team is in charge of design, construction, development and operation of BigRIPS in-flight separator and its related research instruments such as ZeroDegree spectrometer at RI beam factory (RIBF). They are employed not only for the production of RI beams but also various kinds of experimental studies using RI beams.

Main Research Field

Mathematical and physical sciences

Related Research Fields

Interdisciplinary science and engineering / Engineering


  • Nuclear Physics (experiment)

Selected Publications

  1. T. Kubo:
    "In-flight RI beam separator BigRIPS at RIKEN and elsewhere in Japan"
    Nucl. Instr. Meth., B204, 97 (2003).
  2. T. Kubo, K. Kusaka, K. Yoshida, A. Yoshida, T. Ohnishi, M. Ohtake, Y. Yanagisawa, N. Fukuda, T. Haseyama, Y. Yano, N. Kakutani, T. Tsuchihashi and K. Sato:
    "Status and Overview of Superconducting Radioactive Isotope Beam Separator BigRIPS at RIKEN"
    IEEE Transactions on Applied Superconductivity, 17, 1069 (2007).
  3. T. Ohnishi, T. Kubo et al.:
    "Identification of New Isotopes 125Pd and 126Pd produced by In-flight Fission of 345 MeV/nucleon 238U: First Results from the RIKEN RI Beam Factory"
    Journal of the Physical Society of Japan, 77, 083201(2008).
  4. T. Ohnishi, T. Kubo et al.:
    "Identification of 45 New Neutron-Rich Isotopes Produced by In-flight Fission of a 238U Beam at 345 MeV/nucleon"
    Journal of the Physical Society of Japan, 79, 073201(2010).
  5. D. Kameda, T. Kubo et. Al.:
    "Obervation of new microsecond isomers among fission products from in-flight fission of 345 MeV/nucleon 238U"
    Phys. Rev. C86, 054319(2012)
  6. K. Yoshida, N. Fukuda, Y. Yanagisawa, N. Inabe, Y. Mizoi, and T. Kubo:
    "High-Power beam dump system for the Bigrips fragment separator at RIKEN RI Beam Factory"
    Nucl. Instr. Meth., B317, 373 (2013).
  7. H. Kumagai, T. Ohnishi, N. Fukuda, H. Takeda, D. Kameda, N. Inabe, K. Yoshida and T. Kubo:
    "Development of Parallel Plate Avalanche Counter (PPAC) for BigRIPS fragment separator"
    Nucl. Instr. Meth., B317, 717 (2013).
  8. K. Tanaka, N. Inabe, K. Yoshida, K. Kusaka, and T. Kubo:
    "Pillow seal system at the BigRIPS separator"
    Nucl. Instr. Meth., B317, 734 (2013).
  9. H. Suzuki, T. Kubo, et. al.:
    "Production cross section measurements of radioactive isotopes by BigRIPS separator at RIKEN RI Beam Factory"
    Nucl. Instr. Meth., B317, 756 (2013).
  10. K.Tanaka, N. Inabe, K. Yoshida, and T. Kubo:
    "Evaluation of radiation levels and comparison with PHITS calculations for the BigRIPS separator in Radioactive Isotope Beam Factory"
    Progress in Nuclear Science and Technology 4, 201 (2014).

Lab Members

Principal Investigator

Koichi Yoshida
Team Leader

Core Members

Yoshiyuki Yanagisawa
Senior Research Scientist
Naohito Inabe
Senior Technical Scientist
Masao Ohtake
Senior Technical Scientist
Kensuke Kusaka
Nishina Center Research Scientist
Naoki Fukuda
Nishina Center Research Scientist
Hiroyuki Takeda
Nishina Center Research Scientist
Hiroshi Suzuki
Contract Researcher
Yohei Shimizu
Contract Researcher
Deuk Soon Ahn
Postdoctoral Researcher
Zeren Korkulu
Postdoctoral Researcher

Contact information

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

Email: yoshida [at]

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