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Nakamura, Hirofumi; Nishi, Masataka; Sugisaki, Masayasu*
JAERI-Research 2003-018, 32 Pages, 2003/09
JAERI-Research-2003-018.pdf:1.32MB
Tritium transport behavior in materials, which is essential for the safety evaluation of the fusion reactor, has to be evaluated by either tritium properties or extrapolated value from protium or deuterium (D) to tritium (T) using the isotope effect theory. However, there are still some uncertainties on estimation of T behavior in materials, because there are only a few T transport properties data in materials, and it is not completely proven the application of the isotope effect theory to T due to the lack of T data. Therefore, in order to understand the tritium transport properties in materials, isotope effects on diffusion and surface recombination between T and D in/on nickel, whose hydrogen transport properties were well known, were investigated by comparing the obtained properties of T with those of D measured under the same conditions with the ion driven permeation method. Though obtained diffusion coefficient of T was larger than that of D, and activation energy of diffusion of T was smaller than that of D as the contrary to the classical diffusion theory, those were shown to be explained with a modified diffusion theory by introducing higher vibration temperatures in nickel than previous reported values. In addition, the isotope effect on surface recombination coefficient between D and T was shown to be explained using a modified solution model as well as diffusion.
HT and T+TT
in 
He-
He quantum media under saturated vapor pressure at 1.6 KAratono, Yasuyuki; Iguchi, Kazunari; Okuno, Kenji*; Kumada, Takayuki
Journal of Physical Chemistry A, 107(19), p.3741 - 3746, 2003/05
Times Cited Count：4 Percentile：11.72(Chemistry, Physical)An influence of superfluidity on recombination reactions of H+THT, T+TT in He-He quantum media was studied under saturated vapor pressure at 1.6 K. A change of reaction mechanism was observed at transition point from normalfluid to superfluid phase. Tunneling reaction mechanism by H and T bubble atoms was proposed on the basis of large isotope effect.
Daido, Hiroyuki
Reports on Progress in Physics, 65(10), p.1513 - 1576, 2002/10
Times Cited Count：190 Percentile：75.22(Physics, Multidisciplinary)no abstracts in English
Eichler, J.*; Ichihara, Akira
Physical Review A, 65(5), p.052716_1 - 052716_5, 2002/05
Times Cited Count：21 Percentile：65.36(Optics)no abstracts in English
and 
shells of one-electron systems calculated within an exact relativistic descriptionIchihara, Akira; Eichler, J.*
Atomic Data and Nuclear Data Tables, 79(2), p.187 - 222, 2001/11
Times Cited Count：10 Percentile：56.16(Physics, Atomic, Molecular & Chemical)no abstracts in English
ions in metastable statesZhao, L.-B.*; Shirai, Toshizo
Physical Review A, 64(5), p.052704_1 - 052704_6, 2001/11
A computational scheme, based on the theory of continuum-bound transitions of Bell and Seaton [J. Phys. B 
, 1589 (1985)] and the close-coupling R-matrix approach, has been developed to treat dielectronic recombination (DR) in high-lying resonance energy regions. This scheme and our presented numerical method to compute DR in low-lying resonance energy regions [Phys. Rev. A 
, 022706 (2000)] have been applied together to elucidate the experimental spectra of DR of O ions in the metastable 
and 
states. For comparison, a perturbative theoretical calculation of DR for O has also been accompanied. The reasonable representation of the general dielectronic spectral shape is yielded by both our close-coupling and perturbative calculations. However, both the methods do not reproduce the experimental double peak structure at 
6-8 eV. This shows that the further investigation on DR of this kind of ions is required both experimentally and theoretically.
Nakamura, Hirofumi; Hayashi, Takumi; Kakuta, Toshiya*; Suzuki, Takumi; Nishi, Masataka
Journal of Nuclear Materials, 297(3), p.285 - 291, 2001/09
Times Cited Count：17 Percentile：74.85(Materials Science, Multidisciplinary)The isotope effect on the implantation-driven permeation of pure tritium (T) and deuterium (D) through nickel was investigated, respectively. The rate-determining processes of backward flow at the upstream surface and permeation at the down-stream surface were found to be as follows: recombination on up-stream surface and diffusion at down-stream side in a lower temperature region, whereas recombination on both surfaces in a higher temperature region for T and D, respectively. The diffusion coefficients of T and D derived by analyzing the obtained transient data of permeation in the lower temperature region were in good agreement with literature data of deuterium. The obtained activation energy of diffusion for T and D suggested the tendency of mass dependence. The surface recombination coefficients for both isotopes were also derived and showed in good agreement with literature data. As a result, the experimental results indicated the surface recombination could be attributed to the isotope effect of the permeation between T and D rather than the diffusion.
ionsZhao, L.-B.; Shirai, Toshizo
Physical Review A, 63(1), p.703_1 - 703_4, 2001/01
no abstracts in English
Koide, Yoshihiko; Sakasai, Akira; Sakamoto, Yoshiteru; Kubo, Hirotaka; Sugie, Tatsuo
Review of Scientific Instruments, 72(1), p.119 - 127, 2001/01
Times Cited Count：39 Percentile：84.4(Instruments & Instrumentation)no abstracts in English
Z112 calculated within an exact relativistic descriptionIchihara, Akira; Eichler, J.*
Atomic Data and Nuclear Data Tables, 74(1), p.1 - 121, 2000/01
Times Cited Count：68 Percentile：92.88(Physics, Atomic, Molecular & Chemical)no abstracts in English
Sagisaka, Akito*; Nagashima, Keisuke; Yamagiwa, Mitsuru; Matoba, Toru; *
Journal of the Physical Society of Japan, 68(4), p.1221 - 1227, 1999/04
Times Cited Count：2 Percentile：26.15(Physics, Multidisciplinary)no abstracts in English
Yamagiwa, Mitsuru; Koga, J. K.; Sagisaka, Akito*
Journal of Physics B; Atomic, Molecular and Optical Physics, 32(12), p.2881 - 2887, 1999/00
Times Cited Count：0 Percentile：0.01(Optics)no abstracts in English
Kubo, Hirotaka; Higashijima, Satoru; Takenaga, Hidenobu; Shimizu, Katsuhiro; Kumagai, Akira*; Ishijima, Tatsuo*; Suzuki, Shingo*; Itami, Kiyoshi; Sugie, Tatsuo; Sakasai, Akira; et al.
Proc. of 1998 ICPP & 25th EPS Conf. on Contr. Fusion and Plasma Physics, 22C, p.427 - 430, 1998/00
no abstracts in English
Ichihara, Akira; Shirai, Toshizo; J.Eichler*
Physical Review A, 54(6), p.4954 - 4959, 1996/12
Times Cited Count：33 Percentile：81.33(Optics)no abstracts in English
J.Eichler*; Ichihara, Akira; Shirai, Toshizo
Physical Review A, 51(4), p.3027 - 3035, 1995/04
Times Cited Count：53 Percentile：90.56(Optics)no abstracts in English
M
M spectator auger processes in 4d transition metal compoundsYoshii, Kenji; Baba, Yuji; Sasaki, Teikichi
Journal of Electron Spectroscopy and Related Phenomena, 72, p.107 - 112, 1995/00
Times Cited Count：13 Percentile：59.61(Spectroscopy)no abstracts in English
W.Shu*; Okuno, Kenji; Hayashi, Yasunori*
JAERI-M 93-043, 62 Pages, 1993/03
no abstracts in English
Nagasaki, Takanori; Saido, Masahiro; ; Ono, Hideo
Journal of Nuclear Materials, 202, p.228 - 238, 1993/00
Times Cited Count：10 Percentile：69.75(Materials Science, Multidisciplinary)no abstracts in English
Nagasaki, Takanori; ; Ono, Hideo
J. Vac. Sci. Technol., A, 10(1), p.170 - 179, 1992/01
no abstracts in English
Nagasaki, Takanori; ; Ono, Hideo
Journal of Nuclear Materials, 195, p.324 - 328, 1992/00
Times Cited Count：2 Percentile：53.8(Materials Science, Multidisciplinary)no abstracts in English
