Atomic Physics Laboratory

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 Subjects

• Synthesis of spin-polarized antihydrogen beam and CPT test, and atomic collision involving antiprotons
• Production of sub-micro m-size charged particle beams and its application to living cell surgery
• Coherent resonant excitation of GeV highly charged ions and high resolution spectroscopy

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. M.:
   "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.:
   "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. Okabayashi, K. Komaki, and Y. Yamazaki:
   "Enhanced Sputtering from the F/Si(100) Surface with Extraction of the Surface Bond Direction"
   Phys. Rev. Lett. 107 (2011)113201
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