RIBF Research Division
- Radioactive Isotope Physics Laboratory
- Spin isospin Laboratory
- Nuclear Spectroscopy Laboratory
- High Energy Astrophysics Laboratory
- Nuclear Many-body Theory Laboratory
- Superheavy Element Research Group
- Superheavy Element Production Team
- Superheavy Element Research Device Development Team
- Astro-Glaciology Research Unit
Research Facility Development Division
- Accelerator Group
- Accelerator R&D Team
- Ion Source Team
- RILAC Team
- Cyclotron Team
- Beam Dynamics & Diagnostics Team
- Cryogenic Technology Team
- Infrastructure Management Team
Accelerator Applications Research Group
Subnuclear System Research Division
- Strangeness Nuclear Physics Laboratory
- Meson Science Laboratory
- RHIC Physics Research Group
- RIKEN Facility Office at RAL
Directly under the Nishina Center
Muon RI Data Team
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.
- Experimental clarification on muon nuclear capture reactions
- Establishment of theory on muon nuclear capture reactions
List of Selected Publications
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.