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Journal Articles

A Modeling approach to estimate $$^{3}$$H discharge from rivers; Comparison of discharge from the Fukushima Dai-ichi and inventory in seawater in the Fukushima coastal region

Sakuma, Kazuyuki; Machida, Masahiko; Kurikami, Hiroshi; Iwata, Ayako; Yamada, Susumu; Iijima, Kazuki

Science of the Total Environment, 806(3), p.151344_1 - 151344_8, 2022/02

Journal Articles

Development of spin-contrast-variation neutron powder diffractometry for extracting the structure factor of hydrogen atoms

Miura, Daisuke*; Kumada, Takayuki; Sekine, Yurina; Motokawa, Ryuhei; Nakagawa, Hiroshi; Oba, Yojiro; Ohara, Takashi; Takata, Shinichi; Hiroi, Kosuke; Morikawa, Toshiaki*; et al.

Journal of Applied Crystallography, 54(2), p.454 - 460, 2021/04

 Times Cited Count:0 Percentile:0.02(Chemistry, Multidisciplinary)

We developed a spin-contrast-variation neutron powder diffractometry technique that extracts the structure factor of hydrogen atoms, namely, the contribution of hydrogen atoms to a crystal structure factor. Crystals of L-glutamic acid were dispersed in a dpolystyrene matrix containing 4-methacryloyloxy-2,2,6,6,-tetramethyl-1-piperidinyloxy (TEMPO methacrylate) to polarize their proton spins dynamically. The intensities of the diffraction peaks of the sample changed according to the proton polarization, and the structure factor of the hydrogen atoms was extracted from the proton-polarization dependent intensities. This technique is expected to enable analyses of the structures of hydrogen-containing materials that are difficult to determine with conventional powder diffractometry.

Journal Articles

Investigation of single-event damages on silicon carbide (SiC) power MOSFETs

Mizuta, Eiichi*; Kuboyama, Satoshi*; Abe, Hiroshi; Iwata, Yoshiyuki*; Tamura, Takashi*

IEEE Transactions on Nuclear Science, 61(4), p.1924 - 1928, 2014/08

 Times Cited Count:55 Percentile:98.76(Engineering, Electrical & Electronic)

Journal Articles

PHITS; Benchmark of partial charge-changing cross sections for intermediate-mass systems

Mancusi, D.*; Sihver, L.*; Gustafsson, K.*; La Tessa, C.*; Guetersloh, S.*; Zeitlin, C.*; Miller, J.*; Heilbronn, L.*; Niita, Koji*; Sato, Tatsuhiko; et al.

Nuclear Instruments and Methods in Physics Research B, 254(1), p.30 - 38, 2007/01

 Times Cited Count:17 Percentile:76.46(Instruments & Instrumentation)

The PHITS code is a three-dimensional Monte Carlo code that is able to simulate the transport of nuclei and other particles in complicated geometries. As a part of a comprehensive benchmarking program, we have investigated the possibility of using PHITS to calculate partial charge-changing cross sections and we have compared the results with measurements. The results suggest that the current reaction-cross-section models might be inadequate for use in space radiation protection: We therefore claim the need for a thorough benchmarking of the models and for new reaction-cross-section measurements and experimental techniques.

Journal Articles

Si substrate suitable for radiation-resistant space solar cells

Matsuura, Hideharu*; Iwata, Hiroshi*; Kagamihara, So*; Ishihara, Ryohei*; Yoneda, Masahiko*; Imai, Hideaki*; Kikuta, Masanori*; Inoue, Yuki*; Hisamatsu, Tadashi*; Kawakita, Shiro*; et al.

Japanese Journal of Applied Physics, Part 1, 45(4A), p.2648 - 2655, 2006/04

 Times Cited Count:15 Percentile:51.29(Physics, Applied)

no abstracts in English

JAEA Reports

Conceptual study of transmutation experimental facility, 2; Study on ADS target test facility

Sasa, Toshinobu; Umeno, Makoto*; Mizubayashi, Hiroshi*; Mori, Keijiro*; Futakawa, Masatoshi; Saito, Shigeru; Kai, Tetsuya; Nakai, Kimikazu*; Zako, Akira*; Kasahara, Yoshiyuki*; et al.

JAERI-Tech 2005-021, 114 Pages, 2005/03

JAERI-Tech-2005-021.pdf:9.66MB

To perform the research and development for accelerator-driven system (ADS), Japan Atomic Energy Research Institute (JAERI) plans to build a Transmutation Experimental Facility under the JAERI-KEK joint J-PARC program. Transmutation Experimental Facility consists of two buildings, Transmutation Physics Experimental Facility to make reactor physics experiment with subcritical core, and ADS Target Test Facility for the preparation of irradiation database for various structural materials. In this report, purpose to build, experimental schedule, and design study of the ADS target test facility with drawer type spallation target are summarized.

Journal Articles

Change of majority-carrier concentration in p-type silicon by 10 MeV proton irradiation

Iwata, Hiroshi*; Kagamihara, Satoshi*; Matsuura, Hideharu*; Kawakita, Shiro*; Oshima, Takeshi; Kamiya, Tomihiro

Proceedings of the 6th International Workshop on Radiation Effects on Semiconductor Devices for Space Application (RASEDA-6), p.143 - 146, 2004/10

no abstracts in English

JAEA Reports

Investigation research on the evaluation of a coupled thermo-hydro-mechanical-chemical phenomena; outline report

Chijimatsu, Masakazu*; Neyama, Atsushi*; Ishihara, Yoshinao*; Amemiya, Kiyoshi*; *; Iwata, Hiroshi*; Sagawa, Hiroshi*

JNC TJ8400 2002-004, 83 Pages, 2002/02

JNC-TJ8400-2002-004.pdf:0.91MB

In order to realize a coupling analysis in the near field of the geological disposal system, this study has been studied on the addition of the mass transport model to the coupled thermo-hydro-mechanical analysis code (THAMES) and preliminary coupling analysis by using development environmental tool (Diffpack) for numerical analysis. (1) In order to prepare the strategy on the addition of the mass transport model to the coupled thermo-hydro-mechanical analysis code (THAMES), we have studied on the requirement of THAMES-Transport and methodology of coupling analysis. After that we set out modification plan by the Eulerian-Lagrangian (EL) method. (2) Based on the document of modification plan, we have done addition of the mass transport model to the coupled thermo-hydro-mechanical analysis code (THAMES) and carried out verification analysis in order to confirm on the accuracy of THAMES-Transport. (3) In order to understand on the behavior of NaCl in the porewater under the coupled thermo-hydro-mechanical phenomena in the HLW engineered barrier system, we have calculated coupling phenomenon by using THAMES-Transport. Transportation and concentration phenomena of NaCl are calculated but precipitation of NaCl is not occurred under the analysis conditions in this report. (4) In order to confirm about feasibility of coupling analysis under the development environmental tool (Diffpack) for numerical analysis, we have carried out on the design work and writing program of the preliminary coupling system. In this study, we have adopted existing transport model (HYDROGEOCHEM) and geochemical model (phreeqe60) for preliminary coupling system. (5) In order to confirm program correctness of preliminary coupling system, we have carried out benchmarking analysis by using existing reactive-transport analysiscode (HYDROGEOCHEM). (6)We have been prepared short-range development plan based on through the modification study of THAMES and writing program of the preliminary coupling ...

JAEA Reports

Investigation research on the evaluation of a coupled thermo-hydro-mechanical-chemical phenomena; result report

Chijimatsu, Masakazu*; Neyama, Atsushi*; Ishihara, Yoshinao*; Amemiya, Kiyoshi*; *; Iwata, Hiroshi*

JNC TJ8400 2002-003, 155 Pages, 2002/02

JNC-TJ8400-2002-003.pdf:1.51MB

In order to realize a coupling analysis in the near field of the geological disposal system, this study has been studied on the addition of the mass transport model to the coupled thermo-hydro-mechanical analysis code (THAMES) and preliminary coupling analysis by using development environmental tool (Diffpack) for numerical analysis. (1)In order to prepare the strategy on the addition of the mass transport model to the coupled thermo-hydro-mechanical analysis code (THAMES), we have studied on the requirement of THAMES-Transport and methodology of coupling analysis. After that we set out modification plan by the Eulerian-Lagrangian (EL) method. (2)Based on the document of modification plan, we have done addition of the mass transport model to the coupled thermo-hydro-mechanical analysis code (THAMES) and carried out verification analysis in order to confirm on the accuracy of THAMES-Transport. (3)In order to understand on the behavior of NaCl in the porewater under the coupled thermo-hydro-mechanical phenomena in the HLW engineered barrier system, we have calculated coupling phenomenon by using THAMES-Transport. Transportation and concentration phenomena of NaCl are calculated but precipitation of NaCl is not occurred under the analysis conditions in this report. (4)In order to confirm about feasibility of coupling analysis under the development environmental tool (Diffpack) for numerical analysis, we have carried out on the design work and writing program of the preliminary coupling system. In this study, we have adopted existing transport model (HYDROGEOCHEM) and geochemical model (phreeqe60) for preliminary coupling system. (5)In order to confirm program correctness of preliminary coupling system, we have carried out benchmarking analysis by using existing reactive-transport analysiscode (HYDROGEOCHEM). (6)We have been prepared short-range development plan based on through the modification study of THAMES and writing program of the preliminary coupling ...

JAEA Reports

Investigation research of core-basic information associated with the coupling analysis; Outline report

Kataoka, Shinichi*; Kawahara, Kenichi*; Matsunaga, Kenichi*; Ishihara, Yoshinao*; Neyama, Atsushi*; Nakagawa, Koichi*; Iwata, Hiroshi*; Mori, Koji*

JNC TJ8400 2001-037, 33 Pages, 2001/03

JNC-TJ8400-2001-037.pdf:2.02MB

no abstracts in English

JAEA Reports

Investigation research of core-basic information associated with the coupling analysis; result report

Kataoka, Shinichi*; Kawahara, Kenichi*; Matsunaga, Kenichi*; Ishihara, Yoshinao*; Neyama, Atsushi*; Nakagawa, Koichi*; Iwata, Hiroshi*

JNC TJ8400 2001-036, 202 Pages, 2001/03

JNC-TJ8400-2001-036.pdf:7.58MB

The newest literature information in the foreign countries was researched, and this research showed the basic concept of the coupling analysis code to realize coupling analysis in near field of the geological disposal system. The outline of this research is shown in the following. (1)The combination of M (Mechanical) and (Chemistry) is placed on the weak relations, Because coupling analysis of the United States Yucca Mountain limits a site and the specifications of engineered barrier. (2)One of the purposes of this research is information collecting about coupling analysis code NUFT-C adopted in the United States Yucca Mountain. Therefore, we carried out an information exchange with the United States Lawrence Livermore National Laboratory. We could collect the development purpose of analysis code, key function, and information such as a test case analysis. (3)The investigation of the analysis code concerned with the newest information of coupling analysis which contains the geochemistry process and 2 phase system was done based on the public information for the purpose of building some concept of the coupling analysis code, the extraction of the development issues. It could be understood about the future development strategy and the precaution in addition to a phenomenon to deal with, the current status of the coupling analysis technique as a result of the investigation. (4)It was cleared about the mission of the coupling analysis code and the requirement items (function, quality) by this research. Then, some development options were presented. (5)It was studied about the procedure of developing it to satisfy the above requirement toward the conditions that a site isn't selected, the short development. The tool (Diffpack) which could cope with the speed-up of the calculation time and visualization flexibly was effective, and it was summarized about the test case by using this tool, the key function of this tool as that result.

JAEA Reports

None

Makino, Hitoshi; Miyahara, Kaname; Iwata, Hiroshi*

PNC TN8410 95-189, 26 Pages, 1995/07

PNC-TN8410-95-189.pdf:0.64MB

None

Journal Articles

Ion irradiation effects in EuBa$$_{2}$$Cu$$_{3}$$O$$_{y}$$ thin film

; Iwase, Akihiro; Iwata, Tadao; Maeta, Hiroshi; *; *

J. Supercond., 7(1), p.241 - 242, 1994/00

no abstracts in English

Journal Articles

Ion irradiation effects of EuBa$$_{2}$$Cu$$_{3}$$O$$_{y}$$ thin film

; Iwase, Akihiro; Iwata, Tadao; Maeta, Hiroshi; *; *

Superconductors,Surfaces and Superlattices (Trans. of Materials Research Soc. Jpn., Vol. 19A), 0, p.537 - 540, 1994/00

no abstracts in English

Journal Articles

Electron irradiation effects on Y$$_{1}$$Ba$$_{2}$$CCu$$_{3}$$O$$_{y}$$ superconductors

Watanabe, Mitsuo; Kato, Teruo; Naramoto, Hiroshi; Maeta, Hiroshi; Shiraishi, Kensuke; ; Iwase, Akihiro; Iwata, Tadao

Advances in Superconductivity, p.469 - 474, 1989/00

no abstracts in English

Journal Articles

Radiation effect of YBa$$_{2}$$Cu$$_{3}$$O$$_{7-y}$$ irradiated by $$gamma$$-rays and 14MeV neutrons

Kato, Teruo; Watanabe, Mitsuo; ; Naramoto, Hiroshi; Iwata, Tadao; Ikeda, Yujiro; Maekawa, Hiroshi; Nakamura, Tomoo

Japanese Journal of Applied Physics, 27(11), p.L2097 - L2099, 1988/11

no abstracts in English

Journal Articles

Superconducting transitions in La$$_{2-x}$$Na$$_{x}$$CuO$$_{4}$$ and LaBaCaCu$$_{3}$$O$$_{7-y}$$

Kato, Teruo; Watanabe, Mitsuo; Maeta, Hiroshi; Naramoto, Hiroshi; ; Iwata, Tadao

Teion Kogaku, 23(5), p.302 - 306, 1988/05

no abstracts in English

JAEA Reports

None

Iwata, Koji; *; Hiroi, Hiroshi*

PNC TN260 78-01, 231 Pages, 1978/03

PNC-TN260-78-01.pdf:6.83MB

no abstracts in English

Oral presentation

Microstructural analysis on reactor pressure vessel steel using the XAFS method

Iwata, Keiko; Takamizawa, Hisashi; Nishiyama, Yutaka; Shimoyama, Iwao; Okamoto, Yoshihiro; Iwase, Akihiro*; Kojima, Hiroshi*; Mayumi, Ren*

no journal, , 

Microstructure analysis on reactor pressure vessel steel was conducted by using X-ray absorption fine structure (XAFS) method, where local atomic structures and coordination number around selected atoms are obtained. In our presentation, microstructural changes of thermally aged or electron-irradiated samples will be discussed.

22 (Records 1-20 displayed on this page)