RIBF Research Division

Research Facility Development Division

Accelerator Applications Research Group

Subnuclear System Research Division

Directly under the Nishina Center

Closed Laboratory

Muon RI Data Team

Picture of the Team Leader
Team Leader
Teiichiro MATSUZAKID.Sci.
  • ただ今、本人確認中です。申し訳ございません。

Research Areas

Dr. Yoshio Nishina observed muons in cosmic rays in 1937. The muon is an elementary particle belonging to electron group, and the mass is 207 of electron mass. The muon has positive or negative electric charge, and the lifetime is 2.2 msec. The negative muon is caught by a nucleus (atomic number: Z) in materials to form a muonic atom, and is then captured by the nucleus. The negative muon is combined with a proton to form a neutron and a neutrino to create an excited state of the nucleus with the atomic number of Z-1, followed by emissions of neutrons and gamma rays. The muon nuclear capture reaction produces the isotopes of the (Z-1) nucleus. However, the reaction mechanism is not yet well clarified. The research team aims at obtaining the experimental data to understand the mechanism of muon nuclear capture reactions as well as at establishing the reaction theory.

Research Subject

  1. Experimental clarification on muon nuclear capture reactions
  2. Establishment of theory on muon nuclear capture reactions

List of Selected Publications

  1. T. Matsuzaki, K. Ishida, M. Iwasaki:
    "High-Pressure Solid Hydrogen Target for Muon Catalyzed Fusion"
    Journal of Radioanalytical and Nuclear Chemistry 305 (2015) 889-895.
  2. Y. Shimbara, T. Matsuzaki, K. Abe, Y. Fujita, J. Goto, T. Itoh, N. Kikukawa, M. Nagashima, Y. Nakamura, T. Ogura, T. Ohtsubo, S. Ohya, T. Sakai, D. Sera, S. Suzuki, K. Takeda, A. Yajima, T. Yoshikawa:
    "Observation of cosmic-ray muon-capture X-rays emitted from Al and Fe targets"
    J. Phys. Soc. Jpn. 84 (2015) 034301.
  3. N. Funamori1, K. M. Kojima, D. Wakabayashi1, T. Sato, T. Taniguchi, N. Nishiyama, T. Irifune, D. Tomono. T. Matsuzaki, M. Miyazaki, M. Hiraishi, A. Koda. R. Kadono:
    "Muonium in Stishovite: Implications for the Possible Existence of Neutral Atomic Hydrogen in the Earth's Deep Mantle"
    Scientific Reports 5 (2015) 8437.
  4. K. Nishimura, K. Matsuda, R. Komaki, N. Nunomra, S. Wenner, R. Holmestad, T. Matsuzaki, I. Watanabe, F.L. Pratt:
    "Solute-Vacancy Clustering In Al-Mg-Si Alloys Studied By Muon Spin Relaxation Technique"
    Archives of Metallurgy of Materials 60 (2015) 925-929.
  5. Katsuhiko Nishimura, Kenji Matsuda, Takahiro Namiki, Norio Nunomra, Teiichiro Matsuzaki and Wayne D. Hutchison:
    "Time dependent magnetization of an Al-1.6%Mg2Si alloy"
    Materials Transactions 56 (2015) 1307-1309.
  6. S. Wenner, K. Nishimura, K. Matsuda, T. Matsuzaki, D. Tomono, F. L. Pratt, C. D. Marioara, R. Holmestad,:
    "Clustering and vacancy behavior in high- and low-solute Al-Mg-Si alloys"
    Metall. Mater. Trans. 45A (2014) 5777.
  7. K. Nishimura, K. Matsuda, R. Komaki, N. Nunomura, S. Wenner, R. Holmestad, T. Matsuzaki, I. Watanabe, F. L. Pratt, C. D. Marioara,:
    "μSR study of Al-0.67%Mg-0.77%Si alloys"
    J. Phys. Conference Series 551 (2014) 012031.
  8. S. Wenner, K. Nishimura, K. Matsuda, T. Matsuzaki, D. Tomono, F.L. Pratt, C. D. Marioara, R. Holmestad:
    "Muon kinetics in heat-treated Al (–Mg)(–Si) alloys"
    Acta Materialia, 61 (2013) 6082-6092.
  9. S. Wenner, R. Holmestad, K. Matsuda, K. Nishimura, T. Matsuzaki, D. Tomono, F. L. Pratt, C. D. Marioara:
    "Probing defects in Al-Mg-Si alloys using muon spin relaxation"
    Phys. Rev. B86 (2012) 104201.