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Journal Articles

Atomic-scale visualization of surface-assisted orbital order

Kim, H.*; Yoshida, Yasuo*; Lee, C.-C.*; Chang, T.-R.*; Jeng, H.-T.*; Lin, H.*; Haga, Yoshinori; Fisk, Z.*; Hasegawa, Yukio*

Science Advances (Internet), 3(9), p.eeao0362_1 - eeao0362_5, 2017/09

 Times Cited Count:11 Percentile:62.37(Multidisciplinary Sciences)

Journal Articles

Electrical conductivity through a single atomic step measured with the proximity-induced superconducting pair correlation

Kim, H.*; Lin, S.-Z.*; Graf, M.*; Miyata, Yoshinori*; Nagai, Yuki; Kato, Takeo*; Hasegawa, Yukio*

Physical Review Letters, 117(11), p.116802_1 - 116802_5, 2016/09

 Times Cited Count:18 Percentile:75.79(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Excitation spectrum of Josephson vortices on surface superconductor

Kawakami, Takuto*; Nagai, Yuki; Yoshizawa, Shunsuke*; Kim, H.*; Hasegawa, Yukio*; Nakayama, Tomonobu*; Uchihashi, Takashi*; Hu, X.*

Journal of Physics; Conference Series, 568(2), p.022022_1 - 022022_5, 2014/12

 Times Cited Count:2 Percentile:67.45

no abstracts in English

Journal Articles

Imaging Josephson vortices on the surface superconductor Si(111)-($$sqrt{7} times sqrt{3}$$)-In using a scanning tunneling microscope

Yoshizawa, Shunsuke*; Kim, H.*; Kawakami, Takuto*; Nagai, Yuki; Nakayama, Tomonobu*; Hu, X.*; Hasegawa, Yukio*; Uchihashi, Takashi*

Physical Review Letters, 113(24), p.247004_1 - 247004_5, 2014/12

 Times Cited Count:64 Percentile:92.19(Physics, Multidisciplinary)

We have studied the superconducting Si(111)-($$sqrt{7}$$$$times$$$$sqrt{3}$$)-In surface using a $$^{3}$$He-based low-temperature scanning tunneling microscope. Zero-bias conductance images taken over a large surface area reveal that vortices are trapped at atomic steps after magnetic fields are applied. The crossover behavior from Pearl to Josephson vortices is clearly identified from their elongated shapes along the steps and significant recovery of superconductivity within the cores. Our numerical calculations combined with experiments clarify that these characteristic features are determined by the relative strength of the interterrace Josephson coupling at the atomic step.

JAEA Reports

Development of new molybdenum adsorbent

Kimura, Akihiro; Tanimoto, Masataka; Ishida, Takuya; Tsuchiya, Kunihiko; Hasegawa, Yoshio*; Hishinuma, Yukio*; Suzuki, Masashi*

JAEA-Technology 2011-012, 17 Pages, 2011/06

JAEA-Technology-2011-012.pdf:1.72MBJP, 2010-263801   Patent publication (In Japanese)

PZC (Poly-Zirconium Compound) was developed as adsorbent of molybdenum for $$^{99}$$Mo-$$^{rm 99m}$$Tc generator. However, PZC has some faults. So, new adsorbent based on titanium (PTC), was developed for getting rid of faults. This time, $$^{99}$$Mo adsorption and $$^{rm 99m}$$Tc elution tests with PZC and PTC were carried out. As a result, the $$^{99}$$Mo adsorption performance of the PTC was lower than PZC, on the other hand, $$^{rm 99m}$$Tc elution performance of the PTC was higher than PZC.

Journal Articles

Electron compound nature in a surface atomic layer of a two-dimensional hexagonal lattice

Matsuda, Iwao*; Nakamura, Fumitaka*; Kubo, Keisuke*; Hirahara, Toru*; Yamazaki, Shiro*; Choi, W. H.*; Yeom, H. W.*; Narita, Hisashi*; Fukaya, Yuki; Hashimoto, Mie*; et al.

Physical Review B, 82(16), p.165330_1 - 165330_6, 2010/10

 Times Cited Count:9 Percentile:40.75(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Superconducting Pb island nanostructures studied by scanning tunneling microscopy and spectroscopy

Nishio, Takahiro*; An, Toshu*; Nomura, Atsushi*; Miyachi, Kosuke*; Eguchi, Toyoaki*; Sakata, Hideaki*; Lin, S.*; Hayashi, Nobuhiko; Nakai, Noriyuki; Machida, Masahiko; et al.

Physical Review Letters, 101(16), p.167001_1 - 167001_4, 2008/10

 Times Cited Count:97 Percentile:93.25(Physics, Multidisciplinary)

Superconductivity of nanosized Pb-island structures whose radius is 0.8 to 2.5 times their coherence length was studied under magnetic fields using low-temperature scanning tunneling microscopy and spectroscopy. Spatial profiles of superconductivity were obtained by conductance measurements at zero-bias voltage. Critical magnetic fields for vortex penetration and expulsion and for superconductivity breaking were measured for each island. The critical fields depending on the lateral size of the islands and existence of the minimum lateral size for vortex formation were observed.

JAEA Reports

Analyses of core Shroud materials by three dimensional atom probe (Contract research)

Kondo, Keietsu; Nemoto, Yoshiyuki; Miwa, Yukio; Kaji, Yoshiyuki; Tsukada, Takashi; Nagai, Yasuyoshi*; Hasegawa, Masayuki*; Okubo, Tadakatsu*; Hono, Kazuhiro*

JAEA-Research 2006-013, 39 Pages, 2006/12

JAEA-Research-2006-013.pdf:4.57MB

There has been an increasing number of stress corrosion cracking (SCC) incidents on low carbon austenitic stainless steels used in boiling water reactor (BWR) environments. To reveal the acceleration factor of intergranular crack propagation from the viewpoint of solute distribution in stainless steels, the material extracted from a core shroud of Japanese BWR was analyzed by the three dimensional atom probe (3DAP), which has the highest spatial resolution among the various microanalytical techniques. It was revealed by statistical analysis on 3DAP data that solute elements, such as Fe, Cr, Ni, Mo, Mn, Si, are randomly distributed in matrix of the shroud material. This result means that solute was not segregated or precipitated and was not form spinodal decomposition during the service. The concentration profile in the vicinity of grain boundary obtained from 3DAP dataset showed the random distribution of Cr. This result shows that degradation of the corrosion resistance induced by depletion of Cr was not responsible for the crack propagation along grain boundaries in low carbon stainless steel. On the other hand, enrichment of Mo and Si was observed at grain boundary. The width of the enriched zone was about 2 nm across the grain boundary, and the concentration of those elements could be much higher than the concentration obtained by field emission transmission electron microscopy/energy dispersive X-ray spectroscopy (FE-TEM/EDS). Therefore, it is necessary to study about the effects of enrichment of Mo and Si as a potential contributor to SCC.

Journal Articles

New-type neutron source with proton accelerator and its application

Hino, Ryutaro; Yokomizo, Hideaki; Yamazaki, Yoshishige; Hasegawa, Kazuo; Suzuki, Hiromitsu; Soyama, Kazuhiko; Hayashi, Makoto*; Haga, Katsuhiro; Kaminaga, Masanori; Sudo, Yukio*; et al.

Nihon Kikai Gakkai-Shi, 107(1032), p.851 - 882, 2004/11

no abstracts in English

Journal Articles

Estimation of activity and dose distributions around a proton linac induced by beam spill

Nakashima, Hiroshi; Sasamoto, Nobuo; Sakamoto, Yukio; Kusano, Joichi; Hasegawa, Kazuo; Handa, Hiroyuki*; Hayashi, Katsumi*; Yamada, Kobun*; Abe, Teruo*

Journal of Nuclear Science and Technology, 37(Suppl.1), p.870 - 874, 2000/03

no abstracts in English

JAEA Reports

A Study of existing experimental data and validation process for evaluated high energy nuclear data; Report of task force on integral test for JENDEL high energy file in japanese nuclear data committee

Oyama, Yukio; *; Watanabe, Yukinobu*; Kawano, Toshihiko*; Numajiri, M.*; Ueki, Kotaro*; *; Yamano, Naoki*; Kosako, Kazuaki*; *; et al.

JAERI-Review 98-020, 130 Pages, 1998/11

JAERI-Review-98-020.pdf:6.4MB

no abstracts in English

Journal Articles

Design of the pancake-winding central solenoid coil

Yoshida, Kiyoshi; Nishi, Masataka; Tsuji, Hiroshi; Sasaki, Takashi*; Yasukawa, Yukio*; Tsukamoto, Hideo*; *; *; *; Hasegawa, Mitsuru*

Nihon Genshiryoku Gakkai-Shi, 37(10), p.938 - 947, 1995/00

 Times Cited Count:2 Percentile:28.14(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Mechanical test of the model coil wound with large conductor

Hiue, Hisaaki*; Sugimoto, Makoto; Nakajima, Hideo; Hasegawa, Mitsuru*; Yasukawa, Yukio*; Yoshida, Kiyoshi; *; *

JAERI-M 92-127, 33 Pages, 1992/09

JAERI-M-92-127.pdf:1.29MB

no abstracts in English

Journal Articles

Mechanical test ofsuperconducting magnet system for fusion experimental reactor

Sugimoto, Makoto; Yoshida, Kiyoshi; Hasegawa, Mitsuru*; Koizumi, Koichi; Nakajima, Hideo; *; *; *; Yasukawa, Yukio*; Sasaki, Takashi*; et al.

Fusion Technology 1990, p.1530 - 1534, 1991/00

no abstracts in English

JAEA Reports

Design study on H.L.W. geologic repository, IV; for 1984

Ara, Hiroshige*; Fukumitsu, Kenji*; Iizuka, Yunosuke*; Ishii, Takashi*; Izumiya, Yasushi*; Imazu, Masanori*; Utsugida, Yoshizo*; Hasegawa, Makoto*; Maeda, Masaya*; Yabe, Yukio*; et al.

PNC TJ199 84-04VOL1, 20 Pages, 1984/03

PNC-TJ199-84-04VOL1.pdf:0.88MB

None

Oral presentation

Structure and property of titanium dioxide nanosheet

Yamaguchi, Daisuke; Koizumi, Satoshi; Hasegawa, Yoshio*; Hishinuma, Yukio*; Suzuki, Masashi*; Kodama, Hiroto*; Onuma, Masato*; Oba, Yojiro*

no journal, , 

The structure of nitrogen (N)-doped titanium dioxide (TiO$$_2$$), which exhibits an improved photo-catalytic property, was investigated by small-angle neutron (SANS) and X-ray scattering (SAXS) methods. The N-doped TiO$$_2$$ nanosheet showed a SANS profile, of which q-dependence is nearly identical to that of undoped TiO$$_2$$ nanosheet, however, of which intensity is three times as large as that of undoped TiO$$_2$$ nanosheet. As for the SAXS measurements, hardly any difference was observed between undoped TiO$$_2$$ nanosheet and N-doped one. For N-doped nanosheet, a core-shell structure where TiO$$_2$$ particles locate at the center and N atoms surround the surface of TiO$$_2$$ particles was deduced from the analysis of those obtained SANS and SAXS profiles by taking account of the difference in scattering contrast between neutron and X-ray for each component, i.e., Ti, O, and N atoms.

Oral presentation

Syntheses of polytitanium compound without chlorine as molybdenum absorbent for $$^{99}$$Mo-$$^{99m}$$Tc generator

Niizeki, Tomotake*; Hishinuma, Yukio*; Suzuki, Masashi*; Hasegawa, Yoshio*; Nishikata, Kaori; Kimura, Akihiro; Ishida, Takuya; Tanimoto, Masataka; Tsuchiya, Kunihiko

no journal, , 

JP, 2010-263801   Patent publication (In Japanese)

no abstracts in English

Oral presentation

Structure and property of N-doped titanium dioxide catalyst

Yamaguchi, Daisuke; Koizumi, Satoshi; Hasegawa, Yoshio*; Hishinuma, Yukio*; Suzuki, Masashi*; Kodama, Hiroto*; Onuma, Masato*; Oba, Yojiro*

no journal, , 

From the combined SANS and SAXS profiles, both of the neat and N-doped TiO$$_{2}$$ catalyst was characterized to have a sheet-like shape with thickness of several tens to hundreds of nm and to be composed of sub-unit TiO$$_{2}$$ particles of several nm. On the SANS profile, the N-doped TiO$$_{2}$$ catalyst showed a q-dependence nearly identical to that of neat TiO$$_{2}$$ catalyst, however, of which intensity is three times as large as that of neat TiO$$_{2}$$ catalyst. On the other hand, by SAXS measurement, hardly any difference was observed between neat TiO$$_{2}$$ catalyst and N-doped one. The analysis of those obtained SANS and SAXS profiles suggests that the localization of doped N atoms at the surface of TiO$$_{2}$$ particles and hence TiO$$_{2}$$-core/N-shell structure can be inferred for the N-doped TiO$$_{2}$$ material.

Oral presentation

Structural analysis for visible light reactive nitrogen-doped titanium oxide

Yamaguchi, Daisuke; Koizumi, Satoshi; Hasegawa, Yoshio*; Hishinuma, Yukio*; Suzuki, Masashi*; Kodama, Hiroto*; Onuma, Masato*; Oba, Yojiro*

no journal, , 

Among the wide variety of photo-catalytic products titanium dioxide (TiO$$_{2}$$)) is one of the most promising material and various improvement has been attempted. Recently it has been confirmed that the nitrogen (N)-doped TiO$$_{2}$$ can be activated not only by ultraviolet light but also by visible light and thereby an enhancement of the efficiency is attained. However, the difference in structure between bare TiO$$_{2}$$ and N-doped one has not yet been fully clarified despite the considerable structural analyses by using X-ray diffraction (XRD) or microscopy. In this study the structure of N-doped TiO$$_{2}$$ was studied by small-angle neutron (SANS) and X-ray scattering (SAXS) methods by profiting the considerable difference of the scattering contrast of N atom to the neutron and to the X-ray. The resultant SANS and SAXS profiles are different between them, especially at high q region of (q$$geq$$1(nm$$^{-1}$$), where q denotes the magnitude of scattering vector. This result can be interpreted as the localization of N atoms at around the surface area.

Oral presentation

Structure analysis for visible light photocatalytic titanium dioxide by using small-angle scattering

Yamaguchi, Daisuke; Noda, Yohei; Koizumi, Satoshi; Hasegawa, Yoshio*; Hishinuma, Yukio*; Suzuki, Masashi*; Kodama, Hiroto*; Onuma, Masato*; Oba, Yojiro*

no journal, , 

The structure of nitrogen (N)-doped titanium dioxide (TiO$$_{2}$$), which is a visible light photocatalyst, was investigated by small-angle neutron (SANS) and X-ray scattering (SAXS) methods. The bare TiO$$_{2}$$ was fabricated by sol-gel method and possessed a characteristic length of ca. 10 nm due to some regularity consisting of TiO$$_{2}$$ particles and pores. In the air, bare TiO$$_{2}$$ and N-doped TiO$$_{2}$$ specimens showed a similar scattering profiles each other for both of SANS and SAXS measurements. A slight increase of scattering intensity was observed for N-doped TiO$$_{2}$$ specimen only on the SANS profile. To confirm whether the slight difference in SANS profiles between bare TiO2$$_{2}$$ and N-doped TiO$$_{2}$$ specimens was due to the doped N atoms, both of bare TiO$$_{2}$$ and N-doped TiO$$_{2}$$ specimens were soaked in the mixture of H$$_{2}$$O/D$$_{2}$$O = 55/45 (w/w) mixture, of which scattering contrast for neutron is the same as TiO$$_{2}$$, and measured by SANS. The resultant SANS profiles of soaked bare TiO$$_{2}$$ and N-doped TiO$$_{2}$$ specimens were distinctly different each other and the scattering from doped N atoms, which gives the information of their distribution was captured.

38 (Records 1-20 displayed on this page)