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RIKEN Facility Office at RAL
Teiichiro MATSUZAKI
Director
Teiichiro MATSUZAKI (D.Sci.)
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Research Areas

RIKEN has constructed the RIKEN-RAL Muon Facility at Rutherford Appleton Laboratory in the UK, and has been promoting various kinds of science researches by applying unique characters of muon. Muon is created by a decay of pion. Dr. Hideki Yukawa theoretically predicted the pion in 1935, and Dr. Yoshio Nishina observed the muon in cosmic rays in 1937. Muon is classified to the electron family, and the lifetime is 2.2 μ second. The muon mass is 1/9 of proton and 207 times of electron. Muon has 100% spin polarization to the motion axis at the decay of pion. We stop polarized muons in materials, and observe the time evolution of muon spin to measure the local field and the fluctuation at the muon stopping site. This method is called "muon spin relaxation, rotation and resonance (μSR) method", and enables us to study the properties of condensed matters and molecules. In order to apply the μSR method to magnetism studies at surface and interface of functional materials, the development of ultra low energy muon beam has been in progress. Negative muon introduces spontaneous d-t fusions in D2 and T2 mixtures. This process is called "muon catalyzed fusion", and the elementary process has been studied toward realization of energy production. In addition, negative muons generate high energy muonic X-rays at formations of muonic atoms. By precisely measuring muonic X-rays, we can have information on the nuclear shapes, and apply to non-destructive elementary analysis.

Research Subject

  1. Condensed matter and molecular physic by muon spin relaxation method
  2. Ultra low energy muon beam development and the application to surface scienece
  3. Muon catalyzed d-t fusion
  4. Muonic X-ray measurements and the applications

Related links

  1. RIKEN Nishina Center for Accelerator-Based Science Website_Laboratories PageNew Window
  2. RIKEN-RAL PageNew Window
  3. Advanced Meson Science Laboratory PageNew Window

List of Selected Publications

  1. T. Suzuki, F. Yamada, M. Yamada, T. Kawamata, Y. Ishii, I. Watanabe, T. Goto, H. Tanaka, and K. Kubo,
    "Low-Energy Spin Dynamics in randomness-Introduced Spin-Gap Systems Tl1-xKxCuCl3 (0.40 ≦x ≦0.65) Probed by Zero- and Longitudinal-Field Muon Spin Relaxation"
    Phys. Rev. B 82, 094447-1-7 (2010).
  2. T. Nakano, R. Suehiro, A. Hanazawa, K. Watanabe, I. Watanabe, A. Amato, F.L. Pratt, and Y. Nozue,
    "μSR Study on Antiferromagnetism of Alkari-Metal Clusters Incorporated in Zeolite Sodalite"
    J. Phys. Soc. Jpn. 79, 073707-1-4 (2010).
  3. T. Lancaster, S.J. Blundell, F.L. Pratt, I. Franke, A.J. Steele, P.J. Baker, Z. Salman, C. Baines, I. Watanabe, S. Carretta, G.A. Timco, and R.E.P. Winpenny
    "Relaxation of Muon Spins in Molecule Monomagnets"
    Phys. Rev. B 81, 140409(R)-1-4 (2010).
  4. D. Tomono, T. Kawamata, Y. Hirayama, M. Iwasaki, I. Watanabe, K. Ishida, and T. Matsuzaki,
    "Progress in Development of New μSR Spectrometer at RIKEN-RAL"
    J. Physics: Conference Series 225, 012056-1-4 (2010).
  5. I. Watanabe, Y. Ishii, T. Kawamata, T. Suzuki, F.L. Pratt, R. Done, M. Chowdhury, C. Goodway, J. Dreyer, C. Smith, and M. Southern,
    "Development of A Gas-Pressurized High-Pressure μSR Setup at the RIKEN-RAL Muon Facility"
    Physica B 404, 993-995 (2009)
  6. P. Strasser, A. Taniguchi, T. Matsuzaki, K. Ishida, Y. Matsuda, S. Ohya, M. Iwasaki and K. Nagamine
    "Muon spectroscopy with trace alkaline-earth and rare-earth isotopes implanted in solid D2"
    Hyperfine Interactions 193, 121 (2009)
  7. P. Bakule, O. Sukhorukov, Y. Matsuda, F. L. Pratt, P. Gumplinger, T. Momose, E. Torikai, D. Fleming,
    "Toward the first study of chemical reaction dynamics of Mu with vibrational- state-selected reactants in the gas phase: The Mu+H2*(v=1) reaction by stimulated Raman pumping"
    Physica B 404, 585 (2009)
  8. P. Bakule, Y. Matsuda, Y. Miyake, K. Nagamine, M. Iwasaki, Y. Ikedo, K. Shimomura, P. Strasser, S. Makimura
    "Pulsed source of ultra low energy positive muons for near-surface μSR studies"
    Nucl. Instr. and Meth. in Phys. Res. B 266 (2008) 335-346.
  9. H. Imao, K. Ishida, N. Kawamura, T. Matsuzaki, Y. Matsuda, A. Toyoda, P. Strasser, M. Iwasaki, and K. Nagamine
    "Preparation of ortho-para ratio controlled D2 gas for muon-catalyzed fusion"
    Review of Scientific Instruments 79, 053502 (2008)
  10. H. Imao, K. Ishida, N. Kawamura, T. Matsuzaki, Y. Matsuda, A. Toyoda,P. Strasser, M. Iwasaki, K. Nagamine
    "Density effect in d-d muon-catalyzed fusion with ortho- and para-enriched D2"
    Phys. Lett. B 658 (2008) 120-124.

Members

Principal Investigator

Teiichiro MATSUZAKI
Director

Staff Scientist

Isao WATANABE
Senior Research Scientist
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