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JAEA Reports

Report on survey on international hub

Ebisawa, Hirobumi; Hoshino, Junko; Hashimoto, Kazuichiro; Okada, Sohei

JAEA-Review 2011-016, 54 Pages, 2011/06

JAEA-Review-2011-016.pdf:5.94MB

JAEA is promoting initiative to form an international hub in line with its aim to accept more researchers/engineers from all over the world. Establishment of "the Committee for JAEA Internationalization Initiative" was planned in 2010 so as to intensify this initiative, and in February, 2010, we visited research institutions in Europe, which include European Organization for Nuclear Research (CERN), the construction site of ITER in Cadarache, and Rutherford Appleton Laboratory (RAL), with the intention to survey and learn their advanced activities and systems in regard to the International Hub, so that the committee will be able to make fruitful discussion. This report describes strategy taken in each institution for an International Hub, and the state of each institution regarding acceptance and management of overseas researchers and engineers, research environment, living environment/health and welfare, and PR activities/coexistence with the local community.

JAEA Reports

Report on survey on international hub

Ebisawa, Hirobumi; Hoshino, Junko; Hashimoto, Kazuichiro; Okada, Sohei

JAEA-Review 2011-005, 52 Pages, 2011/03

JAEA-Review-2011-005.pdf:4.21MB

Japan Atomic Energy Agency (JAEA) is promoting initiative to form an international Center of Excellence in line with its aim to accept more researchers/engineers from all over the world. Establishment of "Promotion Committee for International Center of Excellence" was planned in 2010 so as to intensify this initiative, and in February, 2010, we visited research institutions in Europe, which include European Organization for Nuclear Research (CERN), the construction site of ITER in Cadarache, and Rutherford Appleton Laboratory (RAL), with the intention to survey and learn their advanced activities and systems in regard to the international Center of Excellence, so that the committee will be able to make fruitful discussion. This report describes strategy taken in each institution for an international Center of Excellence, and the state of each institution regarding acceptance and management of overseas researchers and engineers, research environment, living environment/health and welfare, and PR activities/coexistence with the local community.

Journal Articles

Awaking of quantum; The Basic and recent trend of quantum beam technology

Okada, Sohei

Genshiryoku eye, 52(8), p.28 - 33, 2006/08

no abstracts in English

Journal Articles

Advance of research and development in the Japan Atomic Energy Research Institute

Okada, Sohei; Sawa, Kazuhiro

Denki Hyoron, 89(2), p.54 - 63, 2004/02

The Japan Atomic Energy Research Institute (JAERI) is comprehensively promoting Research and Development (R&D) activities to make the best use of a variety of potentials of atomic energy, based on the governmental policy described in the Atomic Energy Commission's "Long-Term Program for Research, Development and Utilization of Nuclear Energy" and the "Science and Technology Basic Plan" framed by the Council for Science and Technology Policy. These activities pursue long-range stable supply of energy, development of science and technology, and quality improvement of people's life in Japan. This paper introduces major advances of JAERI's R&D from December 2002 to November 2003.

Journal Articles

Observation of fast positron diffraction from a Si(111)7$$times$$7 surface

Kawasuso, Atsuo; Fukaya, Yuki; Hayashi, Kazuhiko; Maekawa, Masaki; Ishimoto, Takayuki*; Okada, Sohei; Ichimiya, Ayahiko*

Materials Science Forum, 445-446, p.385 - 389, 2004/02

We so far discovered the total reflection and the first Bragg peak in reflection high-energy positron diffraction (RHEPD). However, the fractional order diffractions from reconstructed surfaces have been eluded from the observation. We therefore attempted to get RHEPD patterns from a Si-7$$times$$7 surface. Consequently, the 1/7, 2/7 and 3/7 diffraction rings due to Si(111)-7$$times$$7 reconstruction were clearly found in addition to the zeroth and the first Laue zones. The specular intensity was measured as a function of glancing angle. A small structure was found in the total reflection region. The small structure was attributed to the interference of positron wavefunction because of adatoms. However, the overall intensity profile was not well reproduced using a model already determined in the electron diffraction studies. To reproduce the obtained intensity profile, we may need to modify the vertical positions of the topmost surface and/or the absorption potential due to inelastic scattering processes.

JAEA Reports

Development of reflection high-energy positron diffraction (RHEPD) based on an electrostatic positron beam

Ishimoto, Takayuki*; Kawasuso, Atsuo; Ito, Hisayoshi; Okada, Sohei

JAERI-Tech 2003-091, 32 Pages, 2003/12

JAERI-Tech-2003-091.pdf:3.96MB

no abstracts in English

Journal Articles

Si(111)-7$$times$$7 surface probed by reflection high-energy positron diffraction

Kawasuso, Atsuo; Fukaya, Yuki; Hayashi, Kazuhiko; Maekawa, Masaki; Okada, Sohei; Ichimiya, Ayahiko

Physical Review B, 68(24), p.241313_1 - 241313_4, 2003/12

 Times Cited Count:24 Percentile:24.8(Materials Science, Multidisciplinary)

We report the first observation of reflection high-energy positron diffraction from a $$7times7$$ reconstructed Si(111) surface with an well-collimated 20 kV positron beam. The diffraction pattern clearly exhibited the 1/7-th to 3/7-th order Laue zones in addition to the zero-th and first Laue zones. From the dynamical calculation of the rocking curve in the total reflection region, the vertical position of adatom layer was determined to be 1.52 ${AA}$ relative to the stacking fault layer. This value is greater than that predicted in the first principles study suggesting a significant outward relaxation of adatoms.

JAEA Reports

Development of pulsed MeV positron beam line

Maekawa, Masaki; Masuno, Shinichi*; Hirano, Takeshi*; Kondo, Masakazu*; Kawasuso, Atsuo; Ito, Hisayoshi; Okada, Sohei

JAERI-Tech 2003-039, 52 Pages, 2003/03

JAERI-Tech-2003-039.pdf:5.14MB

no abstracts in English

Journal Articles

Reflection high-energy positron diffraction at solid surfaces by improved electrostatic positron beam

Kawasuso, Atsuo; Ishimoto, Takayuki*; Okada, Sohei; Ito, Hisayoshi; Ichimiya, Ayahiko*

Applied Surface Science, 194(1-4), p.287 - 290, 2002/06

 Times Cited Count:6 Percentile:61.83

no abstracts in English

Journal Articles

Defects in 30 keV Er$$^{+}$$-implanted SiO$$_{2}$$/Si studied by positron annihilation and cathodoluminescence

Hirata, Koichi*; Arai, Hideyuki*; Kawasuso, Atsuo; Sekiguchi, T.*; Kobayashi, Y.*; Okada, Sohei

Journal of Applied Physics, 90(1), p.237 - 242, 2001/07

 Times Cited Count:4 Percentile:75.7(Physics, Applied)

no abstracts in English

Journal Articles

Reflection high-energy position diffraction; Solved and unsolved problems

Kawasuso, Atsuo; Kojima, Kazutoshi; Yoshikawa, Masahito; Ito, Hisayoshi; Okada, Sohei; Ichimiya, Ayahiko*

Materials Science Forum, 363-365, p.445 - 447, 2001/05

no abstracts in English

Journal Articles

Research and development of high energy pulsed positron beam

Maekawa, Masaki; Kawasuso, Atsuo; Okada, Sohei; Ito, Hisayoshi

Materials Science Forum, 363-365, p.658 - 660, 2001/05

no abstracts in English

Journal Articles

Positron annihilation studies of defects in ion implanted palladium

Abe, Hiroshi; Uedono, Akira*; Uchida, Hirohisa*; Komatsu, A.*; Okada, Sohei; Ito, Hisayoshi

Materials Science Forum, 363-365, p.156 - 158, 2001/05

no abstracts in English

Journal Articles

Studies of single-event transient current induced in GaAs and Si diodes by energetic heavy ions

Hirao, Toshio; Ito, Hisayoshi; Okada, Sohei; Nashiyama, Isamu*

Radiation Physics and Chemistry, 60(4-5), p.269 - 272, 2001/03

 Times Cited Count:5 Percentile:56.78

no abstracts in English

Journal Articles

Investigation of radiation degradation of Si and GaAlAs optical devices due to gamma-ray and electron irradiation

Onoda, Shinobu*; Mori, H.*; Okamoto, Tsuyoshi*; Hirao, Toshio; Ito, Hisayoshi; Okada, Sohei

Radiation Physics and Chemistry, 60(4-5), p.377 - 380, 2001/03

 Times Cited Count:6 Percentile:51.53

no abstracts in English

Journal Articles

Development of pulsed MeV positron beam line

Maekawa, Masaki; Kondo, Masakazu*; Okada, Sohei; Kawasuso, Atsuo; Ito, Hisayoshi

Radiation Physics and Chemistry, 60(4-5), p.525 - 528, 2001/03

 Times Cited Count:3 Percentile:69.9

no abstracts in English

Journal Articles

Profiling of collimated swift ion microbeam using 16 M bit DRAM

Mori, H.*; Hirao, Toshio; Onoda, Shinobu*; Ito, Hisayoshi; Okada, Sohei; Okamoto, Tsuyoshi*; Koizumi, Yoshiharu*

Radiation Physics and Chemistry, 60(4-5), p.273 - 276, 2001/03

 Times Cited Count:1 Percentile:86.33

no abstracts in English

Journal Articles

Electrical activation of phosphorus-donors introduced in 6H-SiC by hot-implantation

Oshima, Takeshi; Abe, Koji*; Ito, Hisayoshi; Yoshikawa, Masahito; Kojima, Kazutoshi; Nashiyama, Isamu*; Okada, Sohei

Applied Physics A, 71(2), p.141 - 145, 2000/10

no abstracts in English

Journal Articles

Development and application of reflection high-energy positron diffraction

Kawasuso, Atsuo; Okada, Sohei; Ichimiya, Ayahiko*

Nuclear Instruments and Methods in Physics Research B, 171(1-2), p.219 - 230, 2000/08

 Times Cited Count:12 Percentile:33.7

no abstracts in English

Journal Articles

Effect of radiation damage on luminescence of erbium-implanted SiO$$_{2}$$/Si studied by slow positron beam

Kawasuso, Atsuo; Arai, H.*; Hirata, K.*; Sekiguchi, T.*; Kobayashi, Y.*; Okada, Sohei

Radiation Physics and Chemistry, 58(5-6), p.615 - 619, 2000/06

 Times Cited Count:3 Percentile:70.74

no abstracts in English

68 (Records 1-20 displayed on this page)