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Atomic Physics Laboratory
Yasunori YAMAZAKI
Distinguished Senior Scientist
Yasunori YAMAZAKI (D.Eng.)
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Research Areas

Trapping and cooling of a large number of antihprotons, RI ions, and positrons to study the production mechanisms of antihydrogen atoms, antiprotonic atoms and hollow atoms. Particularly, (1)synthesis of spin-polarized antihydrogen atoms and CPT symmetry test through ground state hyperfine splitting, (2)laser and rf spectroscopy of RI (radio isotope) ions for nuclear structure study of unstable nuclei, (3) production of high-density positron plasma and intense positroniums, (4)production of nm-size charged particle beams and its application like living cell surgery, and (5)nano-size modification/analysis with slow highly charged ions, (6)high resolution virtual-photon spectroscopy with channeling heavy ions for the study of high-Z QED and virtual X-ray dressed states.

Research Subject

  1. Synthesis of spin-polarized antihydrogen beam and CPT test, and antiprotonic atom formation
  2. Production of nm-size charged particle beams and its application to living cell surgery
  3. Coherent resonant excitation with GeV highly charged ions and high resolution spectroscopy
  4. Nano-size modification and analysis of surfaces with slow highly charged ions

Related links

  1. RIKEN Advanced Science Institute Website_Laboratories PageNew Window
  2. Individual Website Laboratory PageNew Window

Press release

November 19, 2008
Successful reduction of speed and refrigeration to a temperature of 0.01 K of the RI-beam, which was accelerated to 40% of the speed of light, enabling the development of precision laser nuclear spectroscopy of the atomic nucleus for the construction of an 'ultimate atomic model of nuclei'.
December 6, 2010
New technique for antihydrogen synthesis promises answers to mysteries of antimatter

RIKEN RESEARCH

February 04,2011
Antimatter atoms ready for their close-up
Controlling antihydrogen atoms using two different methods brings physicists closer to answering quantum and cosmic questions New Window
December 24,2010
When matter and antimatter collide
The discovery that particles called antiprotons collide with molecules and atoms in different ways is contrary to theoretical expectations New Window
November 07,2008
Slow motion: antiprotons unravel atoms
Theories on atomic reactions are being tested in collision experiments using a very slow beam of antiprotons New Window
October 31,2008
Antimatter trap to test nature's symmetry
Origins of our Universe could be probed by detailed study of antihydrogen atoms New Window
May 30, 2008
Stopping ultrafast particles and observing what has never been seen before New Window

List of Selected Publications

  1. Y. Enomoto, N. Kuroda, K. Michishio, C. H. Kim, H. Higaki, Y. Nagata, Y. Kanai, H. A. Torii, M. Corradini, M. Leali, E. Lodi-Rizzini, V. Mascagna, L. Venturelli, N. Zurlo, K. Fujii, M. Ohtsuka, K. Tanaka, H. Imao, Y. Nagashima, Y. Matsuda, B. Juhász, A. Mohri, and Y. Yamazaki,:
    "Synthesis of Cold Antihydrogen in a Cusp Trap"
    Phys. Rev. Lett. 105 (2010) 243401.
  2. G. B. Andresen, M. D. Ashkezari, M. Baquero-Ruiz, W. Bertsche, P. D. Bowe, E. Butler, C. L. Cesar, S. Chapman, M. Charlton, A. Deller, S. Eriksson, J. Fajans, T. Friesen, M. C. Fujiwara, D. R. Gill, A. Gutierrez, J. S. Hangst, W. N. Hardy, M. E. Hayden, A. J. Humphries, R. Hydomako, M. J. Jenkins, S. Jonsell, L. V. Jorgensen, L. Kurchaninov, N. Madsen, S. Menary, P. Nolan, K. Olchanski, A. Olin, A. Povilus, P. Pusa, F. Robicheaux, E. Sarid, S. Seif el Nasr, D. M. Silveira, C. So, J. W. Storey, R. I. Thompson, D. P. van der Werf, J. S. Wurtele, and Y. Yamazaki,:
    "Trapped antihydrogen"
    Nature 468(2010)673-676.
  3. H. Knudsen, H. A. Torii, M. Charlton, Y. Enomoto, I. Georgescu, C. A. Hunniford, C. H. Kim, Y. Kanai, H.-P. E. Kristiansen, N. Kuroda, M. D. Lund, R.W. McCullough, K. Tökesi, U. I. Uggerhøj, and Y. Yamazaki,:
    "Target Structure Induced Suppression of the Ionization Cross Section for Very Low Energy Antiproton-Hydrogen Collisions"
    Phys. Rev. Lett. 105 (2010) 213201.
  4. Kuroda, N., Torii, H.A., Shibata, M., Nagata, Y., Barna, D., Hori, M., Horvath, D., Mohri, A., Eades, J., Komaki, K., and Yamazaki, Y.:
    "Radial compression of antiproton cloud for production of intense antiproton beams."
    Phys.Rev.Lett. 100, 203402 (2008)
  5. Iwai, T., Ikeda, T. M., Kojima, Y., Yamazaki, K., Maeshima, N., Imamoto, T., Kobayashi, T., Nebiki, T., Narusawa, G., and Pokhil, P.:
    "Ion irradiation in liquid of mm3 region for cell surgery."
    Appl. Phys. Lett. 92, 023509(2008)
  6. Ikeda, T., Kanai, Y., Kojima, T., Iwai, Y., Kambara, T., and Yamazaki, Y.:
    "Production of a microbeam of slow highly charged ions with a tapered glass capillary."
    Appl. Phys. Lett. 89, 163502(2006)
  7. Azuma, T., Takabayashi, Y., Kondo, C., Muranaka, T., Komaki, K., Yamazaki, Y., Takada, E., and Murakami, T.:
    "Anisotropic X-Ray Emission from Heliumlike Fe24+ Ions Aligned by Resonant Coherent Excitation with a Periodic Crystal Potential."
    Phys. Rev. Lett. 97, 145502(2006)
  8. Kuroda, N., Torii, H.A., Franzen, K. Y., Wang, Z., Yoneda, S., Inoue, N., Hori, M., Juhasz, B., Horvath, D., Higaki, H., Mohri, A., Komaki, K., and Yamazaki, Y.:
    "Confinement of a large number of antiprotons and production of an ultra-slow antiproton beam."
    Phys.Rev.Lett. 94, 023401-4(2005)
  9. N.Oshima, T.M.Kojima, M.Niigaki, A.Mohri, K.Komaki, and Y.Yamazaki,:
    "A new positron accumulation scheme in ultra high vacuum"
    Phys.Rev.Lett. 93 (2004) 195001-4
  10. S. Ninomiya, Y. Yamazaki, F. Koike, H. Masuda, T. Azuma, K. Komaki, K. Kuroki, and M. Sekiguchi,:
    "Stabilized hollow ions extracted in vacuum"
    Phys.Rev.Lett. 78 (1997) 4557-4560
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