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Journal Articles

Emergence of spin-orbit coupled ferromagnetic surface state derived from Zak phase in a nonmagnetic insulator FeSi

Otsuka, Yusuke*; Kanazawa, Naoya*; Hirayama, Motoaki*; Matsui, Akira*; Nomoto, Takuya*; Arita, Ryotaro*; Nakajima, Taro*; Hanashima, Takayasu*; Ukleev, V.*; Aoki, Hiroyuki; et al.

Science Advances (Internet), 7(47), p.eabj0498_1 - eabj0498_9, 2021/11

JAEA Reports

Development of fireproof sheet on glove box panels

Kawasaki, Kohei; Shinada, Kenta; Okamoto, Naritoshi; Kageyama, Tomio; Eda, Takashi; Okazaki, Hiro; Suzuki, Hiromichi; Yamamoto, Kazuya; Otabe, Jun

JAEA-Technology 2020-025, 80 Pages, 2021/03

JAEA-Technology-2020-025.pdf:3.72MB

Plutonium Fuel Production Facility was built in 1988 for the purpose of mainly producing MOX fuel of the prototype fast breeder reactor MONJU, and large glove boxes were installed for handling unsealed nuclear fuel material remotely. The panels of these glove boxes are made of acrylic, except for those installed after December 2013. For fires inside the glove box, automatic fire extinguishing systems using halides have been introduced since the beginning of construction, but for fires outside the glove box, there have been issues with direct measures for acrylic. Therefore, we have developed a fireproof sheet that mitigates the effect of fire outside the glove box on the panels as much as possible. As a result, fire-retardant sheets have been selected and attached to the glove box panels. We conducted a flammability test of the acrylic plate attached with these fireproof sheets and a usage environment influence test of fireproof sheets, and obtained good results. In addition, we set up a working group in the Plutonium Fuel Development Center in view of reducing external exposure during the work of attaching fireproof sheets, in which we discussed and examined the work procedure, and summarized it in the basic procedure manual.

Journal Articles

Experimental evidence for ferromagnetic spin-pairing superconductivity emerging in UGe$$_2$$; A $$^{73}$$Ge-nuclear-quadrupole-resonance study under pressure

Harada, Atsushi*; Kawasaki, Shinji*; Mukuda, Hidekazu*; Kitaoka, Yoshio*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Ito, Kohei*; Haller, E. E.*; Harima, Hisatomo*

Physical Review B, 75(14), p.140502_1 - 140502_4, 2007/04

 Times Cited Count:27 Percentile:73.37(Materials Science, Multidisciplinary)

This paper reports that a different type of superconducting order parameter has been realized in the ferromagnetic states in UGe$$_2$$ via $$^{73}$$Ge-nuclear-quadrupole-resonance experiments performed under pressure. Measurements of the nuclear spin-lattice relaxation rate (1/$$T$$$rm$_1$$) have revealed an unconventional nature of superconductivity such that the up-spin band is gapped with line nodes, but the down-spin band remains gapless at the Fermi level. This result is consistent with that of a ferromagnetic spin-pairing model in which Cooper pairs are formed among ferromagnetically polarized electrons. The present experiment has shed light on the possible origin of ferromagnetic superconductivity, which is mediated by ferromagnetic spin-density fluctuations relevant to the first-order transition inside the ferromagnetic states.

Journal Articles

Unconventional supercondnuctivity in the itinerant ferromagnet UGe$$_2$$; $$^{73}$$Ge-NQR study under pressure

Harada, Atsushi*; kawasaki, Shinji*; Mukuda, Hidekazu*; Kitaoka, Yoshio*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Ito, Kohei*; Haller, E. E.*; Harima, Hisatomo*

Physica B; Condensed Matter, 378-380, p.963 - 964, 2006/05

 Times Cited Count:1 Percentile:7.01(Physics, Condensed Matter)

The superconducting characteristics on the itinerant ferromagnetic superconductor UGe$$_2$$ have been investigated via the $$^{73}$$Ge-NQR measurements under pressure ($$P$$) near the critical pressure $$P_x$$ where the first-order transition takes place from the low-temperature ($$T$$) and low-$$P$$ ferromagnetic phase (FM2) to high-$$T$$ and high-$$P$$ one (FM1). The measurements of nuclear spin-lattice relaxation rate $$T_1$$ have revealed a power-law like behavior as $$T^n$$ without the coherence peak, whereas at low temperatures, it deviates from the $$T^n$$ dependence to a $$T$$-linear like behavior. These results that depend on the pressure are well understood in terms of non-unitary spin-triplet pairing state where the ferromagnetic up-spin band is gapped, but the down-spin band remains gapless at the Fermi level. We will argue an intimate relationship of the onset of SC with FM1 and FM2.

Journal Articles

Cooperative phenomenon of ferromagnetism and unconventional superconductivity in UGe$$_2$$; A $$^{73}$$Ge-NQR study under pressure

Harada, Atsuyuki*; Kawasaki, Shinji*; Kotegawa, Hisashi*; Kitaoka, Yoshio*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Ito, Kohei*; Haller, E. E.*; Harima, Hisatomo*

Journal of the Physical Society of Japan, 74(10), p.2675 - 2678, 2005/10

 Times Cited Count:20 Percentile:69.81(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Spin wave and orbital ordering in the C-type antiferromagnetic phase of Nd$$_{1-x}$$Sr$$_{x}$$MnO$$_{3}$$

Kajimoto, Ryoichi; Yoshizawa, Hideki*; Kawasaki, Ryuichi*; Noda, Kohei*; Kuwahara, Hideki*

Journal of the Physical Society of Japan, 74(1), p.502 - 503, 2005/01

 Times Cited Count:1 Percentile:12.06(Physics, Multidisciplinary)

The spin wave dispersion relation of the C-type antiferromagnetic structure in Nd$$_{0.25}$$Sr$$_{0.75}$$MnO$$_{3}$$ was determined by neutron scattering. The spin exchange interactions show a large anisotropy, which evidences the d$$_{3z^2-r^2}$$ orbital ordering along the $$c$$ axis. The exchange interaction along the $$c$$ direction is fairly large and similar to the value in the ferromagnetic metallic phase, suggesting there is finite hopping of charges along the orbital chains.

Oral presentation

Influence of $$alpha$$-ray irradiation on mechanical strength of polycarbonate material

Kawasaki, Kohei

no journal, , 

no abstracts in English

Oral presentation

Improvement of fireproof performance by sealing the fire-retardant sheet on glove box panels, 2; Influence of usage conditions on glove box panels

Shinada, Kenta; Kawasaki, Kohei; Makino, Takayoshi; Okamoto, Naritoshi

no journal, , 

no abstracts in English

Oral presentation

Improvement of fireproof performance by sealing the fire-retardant sheet on glove box panels, 1; Influence of burning on glove box panels

Kawasaki, Kohei; Shinada, Kenta; Makino, Takayoshi; Okamoto, Naritoshi

no journal, , 

no abstracts in English

Oral presentation

Contamination in the controlled area at the Plutonium Fuel Fabrication Facility in Nuclear Fuel Cycle Engineering Laboratories, 3; Improvement of manuals for body radioactive decontamination

Yoshida, Tadayoshi; Isozaki, Kohei; Tamura, Ken; Nakagawa, Takahiro; Kawasaki, Takashi; Momose, Takumaro

no journal, , 

no abstracts in English

Oral presentation

Contamination in the controlled area at the Plutonium Fuel Fabrication Facility in Nuclear Fuel Cycle Engineering Laboratories, 2; Problems on radiation management and countermeasures

Tamura, Ken; Isozaki, Kohei; Yoshida, Tadayoshi; Nakagawa, Takahiro; Kawasaki, Takashi; Momose, Takumaro

no journal, , 

no abstracts in English

Oral presentation

Contamination in the controlled area at the Plutonium Fuel Fabrication Facility in Nuclear Fuel Cycle Engineering Laboratories, 1; Brief overview of the event

Isozaki, Kohei; Tamura, Ken; Yoshida, Tadayoshi; Nakagawa, Takahiro; Kawasaki, Takashi; Momose, Takumaro

no journal, , 

no abstracts in English

Oral presentation

Acquisition and analysis of alpha-radioactivity data for glove box dismantling

Yoshida, Masato; Kawasaki, Kohei; Aita, Takahiro; Tsubota, Yoichi; Kikuchi, Ryo*; Honda, Fumiya

no journal, , 

no abstracts in English

Oral presentation

Evaluation of ultraviolet on fire-retardant sheet for glove box panels

Kawasaki, Kohei

no journal, , 

no abstracts in English

Patent

漏電遮断器

小野 高徳; 山口 文吾; 川崎 浩平

not registered

JP, 2013-107547  Patent licensing information  Patent publication (In Japanese)

【課題】本発明は、漏電遮断器に配設されているテストボタンを人が誤って動作させることを防止する漏電遮断器のテストボタン誤操作防止カバーおよびそれを用いた漏電遮断器を提供する 【解決手段】漏電遮断器に配設されたテストボタンに指や物品が接触することを防止するテストボタンカバーであって、該テストボタンカバーには、漏電遮断器のテストボタンに相対する位置に、専用の工具でテストボタンを動作させることを可能とする小径で、かつ、貫通したテストボタン押下げ用穴を有するテストボタンカバーである。また、該テストボタンカバーを備えた漏電遮断器である。

15 (Records 1-15 displayed on this page)
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