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Chief Scientist Laboratories Meson Science Laboratory

Chief Scientist: Masahiko Iwasaki (D.Sc.)

Research Summary

Masahiko  Iwasaki

We are conducting two different research subjects. One is the hadron physics focusing at the interaction between mesons and nuclei in the “Pioneering Research Cluster”. The major activity is to study K-meson, second lightest meson having strange-quark, property in the nuclear matter using J-PARC. Another is the muon science, muon science researches covering from condensed matters physics to the fundamental science, mostly using RIKEN-RAL muon facility in “Nishina Center for Accelerator Based Science”.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Interdisciplinary Science & Engineering
  • Mathematical & Physical Sciences


  • Nuclear Physics
  • Hadron Physics
  • Muon Science

Selected Publications

  • 1. S.Ajimura et al.:
    ""K−pp", a Kbar-meson nuclear bound state, observed in 3He(K-,Λp)n reactions"
    Physics Letters B 789 (2019) 620
  • 2. Y.Sada et al.:
    "Structure near the K-+p+p threshold in the in-flight 3He(K-,Λp)n reaction"
    Prog. Theor. Exp. Phys. 2016 (2016) 051D01.
  • 3. T.Hashimoto et al.:
    " Search for the deeply bound K-pp state from the semi-inclusive forward-neutron spectrum in the in-flight K- reaction on helium-3"
    Prog. Theor. Exp. Phys. 2015 (2015) 061D01.
  • 4. T. Nishi et al.:
    "Spectroscopy of Pionic Atoms in 122Sn(d,3He) Reaction and Angular Dependence of the Formation Cross Sections"
    Phys.Rev.Lett. 120 (2018) 15, 152505
  • 5. Y.K. Tanaka et al.:
    "Missing-mass spectroscopy of the 12C(p,d) reaction near the η′-meson production threshold"
    Phys.Rev.C 97 (2018) 1, 015202
  • 6. Y.K. Tanaka et al.:
    "Measurement of excitation spectra in the 12C(p,d) reaction near the η′emission threshol"
    Phys.Rev.Lett. 117 (2016) 20, 202501
  • 7. K. Itahashi et al.:
    "Feasibility Study of Observing η′Mesic Nuclei with (p,d) Reaction"
    Prog.Theor.Phys. 128 (2012) 601-61
  • 8. K.Agari et al.:
    " The K1.8BR spectrometer system at J-PARC"
    Prog. Theor. Exp. Phys. 2012 (2012) 02B011.
  • 9. M.Iio et al.:
    "Development of liquid 3He target for experimental studies of antikaon-nucleon interaction at J-PARC"
    Nucl. Instr. and Meth. A 687 (2012) 1.

Recent Research Results

Annual research report

Lab Members

Principal investigator

Masahiko Iwasaki
Chief Scientist

Contact Information

Main Research Building 304
Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan
Email: advanced_meson [at] riken.jp