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Ono, Masao; Iguchi, Yusuke*; Okayasu, Satoru; Esaka, Fumitaka; Kobayashi, Katsura*; Hao, T.; Bagum, R.*; Osawa, Takahito; Fujii, Kimio; Nakamura, Eizo*; et al.
Defect and Diffusion Forum, 289-292, p.63 - 68, 2009/04
The atomic-scale graded structure of In-Pb alloy was formed by an ultracentrifuge experiment under conditions that a gravitational field of 0.81
10
G for 100 hours at 150 
C in solid state in our previous study. The isotope ratio measurements were performed on the centrifuged sample with secondary ion mass spectrometer (SIMS). 
Pb/
Pb and 
Pb/Pb isotope ratio changed with negative gradient in the direction of centrifugal force approximately 1.5% and 0.8%, respectively. And three-isotope diagram of Pb/Pb versus Pb/Pb proved that the isotope fluctuation depends on isotopic mass difference. These results showed that the strong gravitational field not only affected on the inter-diffusion but also on self-diffusion in this alloy as causing isotope fractionation effect, and the isotope fractionation was dependent on mass-difference.
Ono, Masao; Iguchi, Yusuke*; Okayasu, Satoru; Esaka, Fumitaka; Kobayashi, Katsura*; Hao, T.; Bagum, R.*; Osawa, Takahito; Fujii, Kimio; Nakamura, Eizo*; et al.
Journal of Nuclear Science and Technology, 45(Suppl.6), p.108 - 110, 2008/09
Times Cited Count：1 Percentile：10.05(Nuclear Science & Technology)The atomic-scale graded structure of In-Pb alloy was formed by an ultracentrifuge experiment under conditions that a gravitational field of 810,000 G for 100 hours at 150C (solid state) in our previous study. The isotope fluctuation on this sample was measured using secondary ion mass spectrometer (SIMS). The ratio both Pb/Pb and 
In/
In changed with positive gradient in the direction of centrifugal force approximately 1.2%. These isotope fluctuations were larger than that of starting state of natural state (In
0.2%, Pb0.1%). These show that the sedimentation of isotopes occurred by solid centrifugation in this alloy, although achieved concentration gradients were small.
Mashimo, Tsutomu; Ono, Masao; Huang, X.*; Iguchi, Yusuke*; Okayasu, Satoru; Kobayashi, Katsura*; Nakamura, Eizo*
Journal of Nuclear Science and Technology, 45(Suppl.6), p.105 - 107, 2008/09
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)It was observed that the concentration ratio 
Se/
Se increased by % level in the specimen ultracentrifuged at 0.7
0.9 million G and at 300C(liquid state) or 190C (solid state), respectively. The present result is evidence of sedimentation of substitutional atoms in condensed matter via self-diffusion, and suggests its possible application to isotope separation by condensed matter centrifugation.
Mashimo, Tsutomu; Ono, Masao; Huang, X. S.*; Iguchi, Yusuke*; Okayasu, Satoru; Kobayashi, Katsura*; Nakamura, Eizo*
Europhysics Letters, 81(5), p.56002_1 - 56002_4, 2008/03
Times Cited Count：12 Percentile：59.54(Physics, Multidisciplinary)A strong gravitational field resulted in the gravity-induced diffusion (sedimentation) of isotope atoms in monoatomic solid Se. The layer crystalline morphology consisting of three zones of the fine-grained crystals, the long crystals and feather-shaped crystals grown parallel to gravity direction appeared in the specimen ultracentrifuged at 0.8-1 million G and at 190 C. Change in concentration ratio Se/Se of 
0.8% was observed in the grown crystalline region. These results show an evidence for sedimentation of substitutional atoms in solid via self-diffusion, and suggest possibility of application to control of impurity and crystalline state as well as to isotope separation.
Mashimo, Tsutomu; Ono, Masao; Huang, X. S.*; Iguchi, Yusuke*; Okayasu, Satoru; Kobayashi, Katsura*; Nakamura, Eizo*
Applied Physics Letters, 91(23), p.231917_1 - 231917_3, 2007/12
Times Cited Count：20 Percentile：59.91(Physics, Applied)A strong gravitational field resulted in the sedimentation of isotope atoms in monatomic liquid. The concentration ratio Se/Se increased by greater than 3.5% in specimen ultracentrifuged at 0.70.9 million G and at 300C. The recovered sample had a feather-shaped crystalline morphology. The concentration gradient was nearly twice that of the steady state analytical result (ideal gas system), indicating a non-ideal system diffusion. The present result is evidence of sedimentation of substitutional atoms in condensed matter via self-diffusion, and suggestes its possible application to isotope separation, crystalline control and matter dynamics in massive star.
Fuketa, Toyoshi; Nakamura, Takehiko; Nagase, Fumihisa; Nakamura, Jinichi; Suzuki, Motoe; Sasajima, Hideo; Sugiyama, Tomoyuki; Amaya, Masaki; Kudo, Tamotsu; Chuto, Toshinori; et al.
JAEA-Review 2006-004, 226 Pages, 2006/03
JAEA-Review-2006-004.pdf:34.43MB
Fuel Safety Research Meeting 2005, which was organized by the Japan Atomic Energy Agency was held on March 2-3, 2005 at Toshi Center Hotel, Tokyo. The purposes of the meeting are to present and discuss the results of experiments and analyses on reactor fuel safety and to exchange views and experiences among the participants. The technical topics of the meeting covered the status of fuel safety research activities, fuel behavior under Reactivity Initiated Accident (RIA) and Loss of coolant accident (LOCA) conditions, high fuel behavior, and radionuclide release under severe accident conditions. This summary contains all the abstracts and sheets of viewgraph presented in the meeting.
Nakamura, Yoshiteru; Yokota, Wataru; Okumura, Susumu; Fukuda, Mitsuhiro; Nara, Takayuki; Agematsu, Takashi; Ishibori, Ikuo; Arakawa, Kazuo; Hoshika, Keizo*; *
JAERI-M 94-054, 61 Pages, 1994/03
no abstracts in English
Nakamura, Yoshiteru; Ishibori, Ikuo; Okumura, Susumu; Nara, Takayuki; Yokota, Wataru; Fukuda, Mitsuhiro; Agematsu, Takashi; Arakawa, Kazuo; Mizuhashi, Kiyoshi; Sano, M.*; et al.
JAERI-M 94-007, 74 Pages, 1994/02
no abstracts in English
Okumura, Susumu; Agematsu, Takashi; Yokota, Wataru; Kamiya, Tomihiro; Fukuda, Mitsuhiro; Nakamura, Yoshiteru; Nara, Takayuki; Ishibori, Ikuo; Arakawa, Kazuo; Maruyama, M.*; et al.
Proceedings of 13th International Conference on Cyclotrons and Their Applications, p.648 - 651, 1993/00
no abstracts in English
Okumura, Susumu; Agematsu, Takashi; Yokota, Wataru; Kamiya, Tomihiro; Fukuda, Mitsuhiro; Nakamura, Yoshiteru; Nara, Takayuki; Ishibori, Ikuo; Arakawa, Kazuo; Maruyama, M.*; et al.
Proceedings of the International Conference on Evolution in Beam Applications, p.275 - 279, 1992/00
no abstracts in English
Nakamura, Yoshiteru; Arakawa, Kazuo; Mizuhashi, Kiyoshi; Yokota, Wataru; Kamiya, Tomihiro; Fukuda, Mitsuhiro; Nara, Takayuki; Agematsu, Takashi; Okumura, Susumu; Ishibori, Ikuo; et al.
Proc. of the 8th Symp. on Accelerator Science and Technology, p.194 - 196, 1991/00
no abstracts in English
Okumura, Susumu; Agematsu, Takashi; Yokota, Wataru; Kamiya, Tomihiro; Fukuda, Mitsuhiro; Nakamura, Yoshiteru; Nara, Takayuki; Ishibori, Ikuo; Arakawa, Kazuo; Maruyama, M.*; et al.
Proc. of the 8th Symp. on Accelerator Science and Technology, p.356 - 358, 1991/00
no abstracts in English
Ono, Masao; Iguchi, Yusuke*; Okayasu, Satoru; Esaka, Fumitaka; Kobayashi, Katsura*; Hao, T.; Bagum, R.*; Osawa, Takahito; Fujii, Kimio; Nakamura, Eizo*; et al.
no journal, ,
The atomic-scale graded structure of In-Pb alloy was formed by an ultracentrifuge experiment under conditions that a gravitational field of 0.8110G for 100 hours at 150 C in solid state in our previous study. The isotope ratio measurements were performed on the centrifuged sample with secondary ion mass spectrometer (SIMS, CAMECA IMS-6f). Both In/In and Pb/ isotope ratio changed with negative gradient in the direction of centrifugal force approximately 1.2% showing the tendency that the heavy In isotope (Pb isotope) abundance increased and light In isotope (Pb isotope) abundance decreased in the direction of centrifugal force. This showed that the isotope fractionation effect due to sedimentation of atoms occurred in this alloy by ultracentrifuge experiment.
