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Journal Articles

Dissemination of data measured at the CERN n_TOF facility

Dupont, E.*; Otsuka, Naohiko*; Harada, Hideo; Kimura, Atsushi; n_TOF Collaboration*; 224 of others*

EPJ Web of Conferences, 146, p.07002_1 - 07002_4, 2017/09

 Times Cited Count:2 Percentile:85.61

The n_TOF neutron time-of-flight facility at CERN is used for high quality nuclear data measurements from thermal energy up to hundreds of MeV. In line with the CERN open data policy, the n_TOF Collaboration takes actions to preserve its unique data, facilitate access to them in standardised format, and allow their re-use by a wide community in the fields of nuclear physics, nuclear astrophysics and various nuclear technologies. The present contribution briefly describes the n_TOF outcomes, as well as the status of dissemination and preservation of n_TOF final data in the international EXFOR library.

Journal Articles

Meeting nuclear data needs for advanced reactor systems

Harada, Hideo; Shibata, Keiichi; Nishio, Katsuhisa; Igashira, Masayuki*; Plompen, A.*; Hambsch, F.-J.*; Schillebeeckx, P.*; Gunsing, F.*; Ledoux, X.*; Palmiotti, G.*; et al.

NEA/NSC/WPEC/DOC(2014)446, 111 Pages, 2014/02

Journal Articles

Determination of resonance parameters and their covariances from neutron induced reaction cross section data

Schillebeeckx, P.*; Becker, B.*; Danon, Y.*; Guber, K.*; Harada, Hideo; Heyse, J.*; Junghans, A. R.*; Kopecky, S.*; Massimi, C.*; Moxon, M. C.*; et al.

Nuclear Data Sheets, 113(12), p.3054 - 3100, 2012/12

 Times Cited Count:80 Percentile:96.5(Physics, Nuclear)

Journal Articles

High-temperature strength characterization of advanced 9Cr-ODS ferritic steels

Ukai, Shigeharu*; Otsuka, Satoshi; Kaito, Takeji; Sakasegawa, Hideo*; Chikada, Nobuyoshi*; Hayashi, Shigenari*; Onuki, Somei*

Materials Science & Engineering A, 510-511, p.115 - 120, 2009/06

 Times Cited Count:79 Percentile:95.88(Nanoscience & Nanotechnology)

Oxide dispersion strengthened (ODS) ferritic steels, which are the most promising candidate materials for advanced fast reactor fuel elements, have exceptional creep strength at 973 K. The superior creep property of 9Cr-ODS ferritic steels is ascribed to the formation of a nonequilibrium phase, designated as the residual ferrite. The yield strength of the residual ferrite itself has been determined to be as high as 1360 MPa at room temperature from nanoindentation measurements. The creep strength is enhanced by minimizing the number of packet boundaries induced by the martensitic phase transformation. The creep strain occurs by sliding at weaker regions such as at the grain boundaries and packet boundaries. It is found that 9Cr-ODS ferritic steels behave as fiber composite materials comprising the harder residual ferrite and the softer tempered martensite.

Journal Articles

Effects of aluminum on high-temperature strength of 9Cr-ODS steel

Otsuka, Satoshi; Kaito, Takeji; Inoue, Masaki; Asayama, Tai; Kim, S.-W.; Ukai, Shigeharu*; Narita, Takeshi*; Sakasegawa, Hideo*

Journal of Nuclear Materials, 386-388, p.479 - 482, 2009/04

 Times Cited Count:18 Percentile:78.17(Materials Science, Multidisciplinary)

This paper discusses the effects of small portion of Al contamination ($$<$$0.1wt%) on the high-temperature strength and microstructure of 9Cr-ODS steel. Increasing Al concentration is shown to provide small reduction of ultimate tensile strength as well as 0.2% proof stress at 973 K and 1073 K accompanied by reduction of elongated grains i.e. residual-$$alpha$$ ferrite acting as reinforcement phase. Addition of Al appears to increase the proportion of ferrite phase, which is contrary to general behavior in conventional steels. This unique behavior could be peculiar to the non-equilibrium materials such as mechanically-alloyed alloy. Computer simulation on phase transformation suggests that the fine oxide dispersion in the elongated ferrite could be attributable to the preferential partitioning of Ti and W in ferrite than in austenite at hot-extrusion process at 1423 K.

Journal Articles

Mott insulating state in incommensurate molecular conductors

Seo, Hitoshi; Yoshioka, Hideo*; Otsuka, Yuichi*

Journal of Physics; Conference Series, 132, p.012018_1 - 012018_6, 2008/00

We theoretically investigate the possibility of a Mott insulating state in a class of molecular conductors where the composition ratio between two molecular species is incommensurate to each other, i.e., incommensurate molecular conductors. Although the band-filling becomes irrational and then metallic behavior would be expected, the on-site Coulomb repulsion among the valence electrons together with the potential from the closed-shellions supplying the carriers can give rise to an "incommensurate Mott insulator", which is characterized by the carriers being localized with a period incommensurate to the underlying lattice.

Journal Articles

Nano-mesoscopic structural characterization of 9Cr-ODS martensitic steel for improving creep strength

Otsuka, Satoshi; Ukai, Shigeharu; Sakasegawa, Hideo; Fujiwara, Masayuki; Kaito, Takeji; Narita, Takeshi

Journal of Nuclear Materials, 367-370(1), p.160 - 165, 2007/08

 Times Cited Count:51 Percentile:95.65(Materials Science, Multidisciplinary)

This paper describes the effect on creep strength and microstructure of 9Cr-oxide dispersion strengthened martensitic steel (9Cr-ODS steel) brought by the differences in titanium concentration and consolidation temperature. The increase of titanium concentration to 0.30-0.35wt% was shown to provide remarkable improvement of creep strength accompanied by the increase of residual-alpha ferrite. The elevation of hot-extrusion temperature notably degraded the creep strength, however, appeared to increase the volume fraction of residual-alpha ferrite. Creep deformation process of 9Cr-ODS steel was discussed to explain these results based on microstructure observations.

Journal Articles

The Characterization of synthetic and natural single crystal diamonds by X-ray diffraction

Maeta, Hiroshi*; Matsumoto, Norimasa*; Haruna, Katsuji*; Saotome, Takao*; Ono, Fumihisa*; Sugai, Hiroyuki; Otsuka, Hideo; Ohashi, Kazutoshi*

Physica B; Condensed Matter, 376-377, p.283 - 287, 2006/04

 Times Cited Count:3 Percentile:18.82(Physics, Condensed Matter)

Natural and synthetic single crystal diamonds (type Ia, Ib, IIa and IIb) have been characterized by measurements of the X-ray integrated scattering intensity, lattice parameter and diffuse scattering. We found that the lattice parameter is smallest for natural diamond and largest for the B-doped diamond. We measured the diffuse scattering for (400) Bragg reflection for the four types of crystals. The scattering intensity of the natural crystals diffuses asymmetrically to form a streak along the [100] direction parallel to the reciprocal lattice vector. These results suggest the existence of the nitrogen atom platelets on (100) plane in the natural diamond. We also found the diffuse streaks along the [$$bar{1}$$00] direction for (400) Bragg reflection for the B-doped crystal, suggesting that boron atoms are likely to form precipitates on the (100) plane.

JAEA Reports

Small specimen test technology of fracture toughness in structural material F82H steel for fusion nuclear reactors

Wakai, Eiichi; Otsuka, Hideo; Matsukawa, Shingo*; Ando, Masami; Jitsukawa, Shiro

JAEA-Technology 2006-019, 58 Pages, 2006/03

JAEA-Technology-2006-019.pdf:7.15MB

Small specimen test technology (SSTT) has been developed to investigate mechanical properties of nuclear materials. SSTT has been driven by limited availability of effective irradiation volumes in test reactors and accelerator-based neutron and charged particle sources, and it is very useful for the reduction of waste materials produced in nuclear engineering. In this study new bend test machines have been developed to obtain fracture behaviors of F82H steel for very small bend specimens of pre-cracked $$frac{t}{2}$$-$$frac{1}{3}$$CVN (Charpy V-notch) with 20 mm-length and DFMB (deformation and fracture mini bend specimen) with 9 mm-length and disk compact tension of 0.18DCT type, and fracture behaviors were examined to evaluate DBTT (ductile-brittle transition temperature) at temperatures from -180 to 250$$^{circ}$$C. The effect of specimen size on DBTT of F82H steel was also examined by using Charpy type specimens such as $$frac{t}{2}$$-CVN, $$frac{1}{3}$$CVN and $$frac{t}{2}$$-$$frac{1}{3}$$CVN. In this paper, it also provides the information of the specimens irradiated at 250$$^{circ}$$C and 350$$^{circ}$$C to about 2 dpa in the capsules of 04M-67A and 04M-68A of JMTR experiments.

Journal Articles

Mechanical properties of small size specimens of F82H steel

Wakai, Eiichi; Otsuka, Hideo*; Matsukawa, Shingo; Furuya, Kazuyuki*; Tanigawa, Hiroyasu; Oka, Keiichiro*; Onuki, Somei*; Yamamoto, Toshio*; Takada, Fumiki; Jitsukawa, Shiro

Fusion Engineering and Design, 81(8-14), p.1077 - 1084, 2006/02

 Times Cited Count:11 Percentile:63.08(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Radiation defects in heavy ion-irradiated nickel at low temperature by X-ray diffuse scattering

Maeta, Hiroshi*; Matsumoto, Norimasa; Kato, Teruo; Sugai, Hiroyuki; Otsuka, Hideo*; Sataka, Masao

Nuclear Instruments and Methods in Physics Research B, 232(1-4), p.312 - 316, 2005/05

 Times Cited Count:1 Percentile:14.98(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Radiation defects in nano-structured materials

Otsuka, Hideo; Hojo, Kiichi; Maeta, Hiroshi*; Otsu, Hitoshi; Sugai, Hiroyuki; Yamamoto, Hiroyuki

European Physical Journal D, 16(1-3), p.309 - 311, 2001/09

no abstracts in English

JAEA Reports

Basic study on vacuum system of an electron synchrotron and mock-up tests

Otsuka, Hideo; *; Shimada, Taihei

JAERI-M 93-051, 37 Pages, 1993/03

JAERI-M-93-051.pdf:1.13MB

no abstracts in English

Journal Articles

Convective loss in tokamaks

Otsuka, Hideo; JFT-2M Group

Nuclear Fusion, 33(4), p.523 - 532, 1993/00

 Times Cited Count:8 Percentile:33.65(Physics, Fluids & Plasmas)

no abstracts in English

JAEA Reports

Study on particle transport to wall in JFT-2M edge plasma by accelerator-based analysis

*; *; *; *; *; Sengoku, Seio; Otsuka, Hideo; Maeda, Hikosuke

JAERI-M 91-048, 57 Pages, 1991/03

JAERI-M-91-048.pdf:1.68MB

no abstracts in English

Journal Articles

SPring-8 complex

Otsuka, Hideo

Hoshasen Kagaku, 34(7), p.201 - 205, 1991/00

no abstracts in English

Journal Articles

Ion Bernstein wave experiment on JFT-2M tokamak

Tamai, Hiroshi; Ogawa, Toshihide; Matsumoto, Hiroshi; Odajima, Kazuo; ; Hoshino, Katsumichi; Kasai, Satoshi; Kawakami, Tomohide; Kawashima, Hisato; Kondoh, Takashi; et al.

Japanese Journal of Applied Physics, 29(10), p.L1911 - L1914, 1990/10

 Times Cited Count:1 Percentile:10.21(Physics, Applied)

no abstracts in English

JAEA Reports

Basic design for the vacuum system of the synchrotron in the large synchrotron radiation facility

*; Otsuka, Hideo; *; Harami, Taikan; Yokomizo, Hideaki; Suzuki, Yasuo

JAERI-M 90-121, 61 Pages, 1990/08

JAERI-M-90-121.pdf:1.05MB

no abstracts in English

Journal Articles

Injector design for the 8 GeV synchrotron radiation facility in Japan

Harami, Taikan; Yokomizo, Hideaki; Otsuka, Hideo; Shimada, Taihei; ; ; Yoshikawa, Hiroshi; Suzuki, Hiromitsu; Kabasawa, M.*; *; et al.

Part. Accel., 33, p.1753 - 1758, 1990/00

no abstracts in English

Journal Articles

Observation of direct electron heating by the fast waves in the low-hybrid range of frequencies in the JFT-2M tokamak

Yamamoto, Takumi; Uesugi, Yoshihiko; Kawashima, Hisato; Hoshino, Katsumichi; ; Kasai, Satoshi; Kawakami, Tomohide; Kondoh, Takashi; Maeda, Hikosuke; Matsuda, Toshiaki; et al.

Physical Review Letters, 63(11), p.1148 - 1151, 1989/09

 Times Cited Count:17 Percentile:75.33(Physics, Multidisciplinary)

no abstracts in English

41 (Records 1-20 displayed on this page)