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Nakajima, Kenji; Kawakita, Yukinobu; Ito, Shinichi*; Abe, Jun*; Aizawa, Kazuya; Aoki, Hiroyuki; Endo, Hitoshi*; Fujita, Masaki*; Funakoshi, Kenichi*; Gong, W.*; et al.
Quantum Beam Science (Internet), 1(3), p.9_1 - 9_59, 2017/12
The neutron instruments suite, installed at the spallation neutron source of the Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC), is reviewed. MLF has 23 neutron beam ports and 21 instruments are in operation for user programs or are under commissioning. A unique and challenging instrumental suite in MLF has been realized via combination of a high-performance neutron source, optimized for neutron scattering, and unique instruments using cutting-edge technologies. All instruments are/will serve in world-leading investigations in a broad range of fields, from fundamental physics to industrial applications. In this review, overviews, characteristic features, and typical applications of the individual instruments are mentioned.
-irradiationOhshima, Yasuhiro; Tsukimoto, Mitsutoshi*; Harada, Hitoshi*; Kojima, Shuji*
Journal of Radiation Research, 53(4), p.551 - 557, 2012/07
Times Cited Count：42 Percentile：82.63(Biology)Yasuda, Ryo; Nitto, Koichi*; Konagai, Chikara*; Shiozawa, Masahiro*; Takenaka, Nobuyuki*; Asano, Hitoshi*; Murakawa, Hideki*; Sugimoto, Katsumi*; Nojima, Takehiro; Hayashida, Hirotoshi; et al.
Nuclear Instruments and Methods in Physics Research A, 651(1), p.268 - 272, 2011/09
Times Cited Count：7 Percentile：48.75(Instruments & Instrumentation)Neutron radiography is one of useful tools to visualize water behavior in fuel cells under operation. In order to observe the detailed information about the water distribution in MEA and GDL in fuel cells, a high spatial resolution and high sensitivity neutron imaging system are required. We developed an imaging system using the neutron color imaging intensifier and continuously observed water distribution in operating a fuel cell. By using the system, a small type fuel cell under operation was continuously observed at the TNRF in every 20 sec. In the results, the water area was appeared from GDL and MEA, and expanded to the channel of the cathode side. On the other hand, voltage was gradually reduced with the operation time, and steeply dropped. It is considered that voltage drop was caused by blockage of gas flow due to the piling up water in the channel of the cathode side.
studied by photoemission and soft X-ray absorption spectroscopiesUtsumi, Yuki*; Sato, Hitoshi*; Kurihara, Hidenao*; Maso, Hiroyuki*; Hiraoka, Koichi*; Kojima, Kenichi*; Tobimatsu, Komei*; Okochi, Takuo*; Fujimori, Shinichi; Takeda, Yukiharu; et al.
Physical Review B, 84(11), p.115143_1 - 115143_7, 2011/09
Times Cited Count：11 Percentile：44.51(Materials Science, Multidisciplinary)We have studied conduction-band (CB) electronic states of a typical valence-transition compound YbInCu by means of temperature-dependent hard X-ray photoemission spectroscopy (HX-PES), soft X-ray absorption spectroscopy (XAS), and soft X-ray photoemission spectroscopy (SX-PES) of the valence band. We have described the valence transition in YbInCu in terms of the charge transfer from the CB to Yb 4
states.
Sato, Shoichi*; Ichimura, Makoto*; Yamaguchi, Yusuke*; Katano, Makoto*; Imai, Yasutaka*; Murakami, Tatsuya*; Miyake, Yuichiro*; Yokoyama, Takuro*; Moriyama, Shinichi; Kobayashi, Takayuki; et al.
Plasma and Fusion Research (Internet), 5, p.S2067_1 - S2067_4, 2010/12
Ion cyclotron emissions (ICEs) due to deuterium-deuterium fusion-product (FP) ions on JT-60U are studied. ICE due to H-ions is identified from the difference of the toroidal wave number of 2nd ICE(D). The parameter dependence for the appearance of ICE(H) is investigated from the experimental conditions and also is studied by using "Escape Particle Orbit analysis Code (EPOC)".
Rn and its decay products coupled with a mesoscale meteorological model, 1; Model description and validationNishizawa, Masato; Nagai, Haruyasu; Chino, Masamichi; Moriizumi, Jun*; Yoshioka, Katsuhiro*; Okura, Takehisa; Yamazawa, Hiromi*; Iida, Takao*; Mukai, Hitoshi*; Tojima, Yasunori*; et al.
Journal of Nuclear Science and Technology, 44(11), p.1458 - 1466, 2007/11
Times Cited Count：5 Percentile：37.16(Nuclear Science & Technology)A three-dimensional Eulerian numerical model for Rn and its decay products coupled with a mesoscale meteorological model has been developed and applied to the reproduction of the daily and monthly variations of Rn concentration, the monthly variation of 
Pb deposition in Japan and the temporal variation of dose rate after the cold front passage in the coastal area of the Japan Sea for the verification of model capability. The results are as follows: (1) The model reproduced the monthly variation of surface Rn concentration in remote islands, but underestimated inland concentration due to coarse vertical resolution near the surface of the model. (2) The model reproduced the seasonal variation of the observed and the long-term yearly averaged Pb depositions as long as precipitations are predicted precisely. (3) The model reproduced the rise of dose rate in precipitation accompanied with the cold front passage. In particular, Rn decay products in melted snow and graupel contributed the rise of dose rate.
Hakoda, Teruyuki; Goto, Hitoshi*; Shimada, Akihiko; Ochi, Masafumi*; Kojima, Takuji
Radiation Physics and Chemistry, 75(3), p.375 - 383, 2006/03
Times Cited Count：8 Percentile：49.48(Chemistry, Physical)no abstracts in English
Sato, Hitoshi*; Yoshikawa, Kunta*; Hiraoka, Koichi*; Arita, Masashi*; Fujimoto, Koji*; Kojima, Kenichi*; Muro, Takayuki*; Saito, Yuji; Sekiyama, Akira*; Suga, Shigemasa*; et al.
Physical Review B, 69(16), p.165101_1 - 165101_6, 2004/04
Times Cited Count：33 Percentile：77.86(Materials Science, Multidisciplinary)no abstracts in English
Koizumi, Hitoshi*; Taguchi, Mitsumasa; Kojima, Takuji; Ichikawa, Tsuneki*
JAERI-Review 2003-033, TIARA Annual Report 2002, p.143 - 144, 2003/11
no abstracts in English
-ray analysisMatsue, Hideaki; Ojima, Hitoshi*; Yoshida, Hirokazu*; Asano, Nobuko*; Hasegawa, Shoichi*; Cho, Akio*; Hatsukawa, Yuichi; Segawa, Mariko; Osawa, Takahito; Numao, Tatsuya*; et al.
no journal, ,
no abstracts in English
Sato, Shoichi*; Ichimura, Makoto*; Yamaguchi, Yusuke*; Katano, Makoto*; Imai, Yasutaka*; Murakami, Tatsuya*; Miyake, Yuichiro*; Yokoyama, Takuro*; Moriyama, Shinichi; Kobayashi, Takayuki; et al.
no journal, ,
Ion cyclotron emissions (ICEs) due to deuterium-deuterium fusion-product (FP) ions on JT-60U are studied. ICE due to H-ions is identified from the difference of the toroidal wave number of 2nd ICE(D). The parameter dependence for the appearance of ICE(H) is investigated from the experimental conditions and also is studied by using "Escape Particle Orbit analysis Code (EPOC)".
Yasuda, Ryo; Shiozawa, Masahiro*; Takenaka, Nobuyuki*; Asano, Hitoshi*; Hayashida, Hirotoshi; Sakai, Takuro; Honda, Mitsunori; Iikura, Hiroshi; Nojima, Takehiro; Matsubayashi, Masahito
no journal, ,
Neutron radiography is an effective water diagnostic tool for fuel cells. We continuously observed water behavior in a small type fuel cell under operation by high performance neutron radiography system using Neutron image intensifier. Water generated in the cell was initially accumulated in region of MEA and GDL, extending to a channel gradually. We will report and discuss about relationship between voltage drop and the water behavior in presentation.
Yasuda, Ryo; Sakai, Takuro; Nojima, Takehiro; Iikura, Hiroshi; Matsubayashi, Masahito; Nitto, Koichi*; Konagai, Chikara*; Shiozawa, Masahiro*; Murakawa, Hideki*; Sugimoto, Katsumi*; et al.
no journal, ,
Polymer electrolyte fuel cells (PEFC) are expected as one of the clean energy sources in next generation. The water management is one of important subjects for enhance of stability and durability of the PEFC. Neutron radiography is one of useful tools to visualize water behavior in operating fuel cells. In order to observe the detailed information about the water distribution in fuel cells, we developed an imaging system using a neutron color image intensifier which is novel neutron image detector with high spatial resolution and high sensitivity. By using the imaging system, the water distribution in a small sized fuel cell during operation was visualized. In this paper we would report results and discussion about correlation between the water behavior and fuel cell performance.
Yamaguchi, Daisuke; Koizumi, Satoshi; Ojima, Hitoshi*; Isoyama, Ryo*; Ishiwatari, Yoshiyuki*; Kodama, Hiroto*; Takeda, Hisanori*; Fukita, Hitoshi*; Takashima, Yoshiyuki*
no journal, ,
Resin-filler composites were investigated by small-angle neutron scattering (SANS). Two types of fillers, talc and TiO
, were employed and compounded with polypropylene in this study. The dispersion state of the fillers was examined by SANS measurements. In addition, the size distribution of the fillers was separately measured through the laser right scattering and SEM. The calculated scattering function including the polydispersity of fillers whose size distribution reflects the results of laser right scattering and SEM consistently reproduced the experimental SANS scattering profiles.
Tashiro, Shinsuke; Matsumoto, Tetsuya; Kataoka, Osamu; Amano, Yuki; Abe, Hitoshi; Yamane, Yuichi; Yoshida, Kazuo; Ishikawa, Jun; Uchiyama, Gunzo; Ueda, Yoshinori*; et al.
no journal, ,
Measurements on the release ratios of aerial radioactive materials from mocked fuel reprocessing liquid waste under its boiling to dryness process were performed using labo-scaled experiments. Test sample, dissolved 27 elements into nitric acid and arranged to 2M acidity, was heated up to 300 
C under the constant air ventilation. Steam, gaseous and airborne materials were collected or absorbed at the condenser, the air filter and the washing bottles. The accumulated release ratios of mocked FP elements from samples were determined using ICP-MS. From the accumulated release ratios determined from the condensed samples, the major release of Cs and Ru could be involved the release of mist and gaseous RuO, respectively. Besides, accumulated release ratios of Ru was about 10 to 1000 times higher than Cs, differed from the literature using fuel reprocessing liquid waste. Its differences could be influenced the nitrous acid, which was reduced the generation of RuO.
Tashiro, Shinsuke; Matsumoto, Tetsuya; Kataoka, Osamu; Amano, Yuki; Abe, Hitoshi; Yamane, Yuichi; Yoshida, Kazuo; Ishikawa, Jun; Uchiyama, Gunzo; Ueda, Yoshinori*; et al.
no journal, ,
The release behavior of radioactive materials from high-level radioactive liquid wastes (HLW) from reprocessing plants under an accidents of boiling to dryness of HLW condition has been studied. The influences of FP concentration in the simulated HLW on the release ratio of FP from the waste were measured in the laboratory-scaled experiments using non-radioactive simulated HLW which was prepared by dissolving 27 FP elements into nitric acid and adjusted to 2 M acidity. The simulated HLW was heated up to 300C under the constant air ventilation condition. The accumulated release ratios of FP elements from samples were determined using ICP-MS analysis. It was found that the accumulated release ratio of Ru was decreased with the increase of the initial Ru concentration in the simulated HLW. However, those of Cs and Nd were not influenced by the initial concentrations of them.
-ray irradiation on zirconium in nitric acid solutionIshijima, Yasuhiro; Ueno, Fumiyoshi; Abe, Hitoshi; Sakai, Junichi*; Nojima, Yasuo*; Hashikura, Yasuaki*
no journal, ,
Besause of good corrosion resistance in boiling nitric acid solution, some equipment in the nuclear fuel reprocessing plant has been made of zirconium (Zr). However, it is well known that Zr has susceptibility of hydrogen embrittleent by hydride formation. To evaluate radiolitic hydrogen absorption behavior, radiolytic hydrogen absorption tests and constant load tensile tests under -ray irradiation were carried out. From test results, the maximum value of absorbed hydrogen was 250 wppm. On the other hand, Zr did not failure in constant load tensile test under -ray irradiation until 1000 hr. These results shows that, Zr can absorb radiolytic hydrogen but hydride generation rate into the metal is very slow. And it is considered that it is improtant to evaluate hydride generation behavior under plant operation environment.
