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Journal Articles

How different is the core of $$^{25}$$F from $$^{24}$$O$$_{g.s.}$$ ?

Tang, T. L.*; Uesaka, Tomohiro*; Kawase, Shoichiro; Beaumel, D.*; Dozono, Masanori*; Fujii, Toshihiko*; Fukuda, Naoki*; Fukunaga, Taku*; Galindo-Uribarri. A.*; Hwang, S. H.*; et al.

Physical Review Letters, 124(21), p.212502_1 - 212502_6, 2020/05

 Times Cited Count:1 Percentile:30.13(Physics, Multidisciplinary)

The structure of a neutron-rich $$^{25}$$F nucleus is investigated by a quasifree ($$p,2p$$) knockout reaction. The sum of spectroscopic factors of $$pi 0d_{5/2}$$ orbital is found to be 1.0 $$pm$$ 0.3. The result shows that the $$^{24}$$O core of $$^{25}$$F nucleus significantly differs from a free $$^{24}$$O nucleus, and the core consists of $$sim$$35% $$^{24}$$O$$_{rm g.s.}$$, and $$sim$$65% excited $$^{24}$$O. The result shows that the $$^{24}$$O core of $$^{25}$$F nucleus significantly differs from a free $$^{24}$$O nucleus. The result may infer that the addition of the $$0d_{5/2}$$ proton considerably changes the neutron structure in $$^{25}$$F from that in $$^{24}$$O, which could be a possible mechanism responsible for the oxygen dripline anomaly.

JAEA Reports

English translation of material used at "Meeting to Answer Questions on Radiation"

Kono, Yuko; Ayame, Junko; Yoshida, Tomoo*; Ikuta, Yuko; Kawase, Keiichi; Yamashita, Kiyonobu

JAEA-Review 2018-007, 36 Pages, 2018/06

JAEA-Review-2018-007.pdf:6.72MB

English translation of the material used at "Meeting to Answer Questions on Radiation" was made. "Meeting to Answer Questions on Radiation" was planned, just after the TEPCO Fukushima Daiichi Nuclear Power Plant Accident, by Japan Atomic Energy Agency (JAEA) with the purpose of providing comprehensive knowledge of radiation to the public. A total of 220 meetings was carried out from July, 2011 to February, 2013 mainly in Fukushima prefecture. Since the material used in the meetings contains many charts and is easy to understand, it has drawn attention of the International Atomic Energy Agency (IAEA) who has in recent years actively supported outreach activities to disseminate knowledge on nuclear and radiation. At one of the IAEA meetings in May, 2017, Asian Network for Education in Nuclear Technology (ANENT), it was requested to make it for the usage of all. Providing IAEA and the member states with the English translation of the material will be a meaningful contribution sharing the outreach activity experiences in Japan.

Journal Articles

New precise measurement of muonium hyperfine structure interval at J-PARC

Ueno, Yasuhiro*; Aoki, Masaharu*; Fukao, Yoshinori*; Higashi, Yoshitaka*; Higuchi, Takashi*; Iinuma, Hiromi*; Ikedo, Yutaka*; Ishida, Keiichi*; Ito, Takashi; Iwasaki, Masahiko*; et al.

Hyperfine Interactions, 238(1), p.14_1 - 14_6, 2017/11

 Times Cited Count:3 Percentile:6.76

Journal Articles

New muonium HFS measurements at J-PARC/MUSE

Strasser, P.*; Aoki, Masaharu*; Fukao, Yoshinori*; Higashi, Yoshitaka*; Higuchi, Takashi*; Iinuma, Hiromi*; Ikedo, Yutaka*; Ishida, Keiichi*; Ito, Takashi; Iwasaki, Masahiko*; et al.

Hyperfine Interactions, 237(1), p.124_1 - 124_9, 2016/12

 Times Cited Count:5 Percentile:7.43

JAEA Reports

Report for "FY 2013 Evaluation of Decontamination Technology Demonstrations Projects for the environmental remediation with radioactive materials discharged from the Fukushima Daiichi Nuclear Power Plant Accident" (Contract research)

Watanabe, Masahisa; Tagawa, Akihiro; Umemiya, Noriko; Maruyama, Noboru; Yoshida, Mami; Kawase, Keiichi; Noguchi, Shinichi; Sakazume, Yoshinori; Watanabe, Masanori; Hiraga, Hayato; et al.

JAEA-Review 2014-028, 184 Pages, 2014/10

JAEA-Review-2014-028.pdf:37.79MB

JAEA received technical proposals from private enterprise about techniques that can be used for decontamination work, and "Decontamination Technology Demonstrations Projects" was commissioned from the Ministry of the Environment to verifies the decontamination effect, economy feasibility, safety, and other factors. By the "FY 2013 Decontamination Technology Demonstrations Projects" JAEA carried out technical advice of demonstration test and evaluation of 11 technologies (e.g., decontamination of soils and green space and wastes and washing of fly ash).

JAEA Reports

Technical report on sodium technology in the field of material research; On the material corrosion and the mechanical strength in high temperature sodium

Yoshida, Eiichi

JAEA-Review 2013-026, 151 Pages, 2013/12

JAEA-Review-2013-026.pdf:20.79MB

Corrosion research of the materials in high temperature sodium was done since 1960's in U.S., Europe, Russia and Japan for the development of sodium-cooled fast reactors, and the many excellent results were obtained. In Japan, various equipment was designed and manufactured to establish the material-testing technologies and to develop the sodium environmental effect methods. Up to present, the R&D examinations in sodium were performed using the equipment, and many experience and knowledge were obtained. The results were reflected to the experimental reactor "Joyo", the prototype nuclear reactor "Monju" and the R&D for commercial fast reactors. In this report, the sodium technology in the field of material research and the effect of sodium on material properties were reviewed based on author's experience and knowledge. Author hopes that the report is reflected to the future R&D and the technical succession for engineers.

Journal Articles

Development of small specimen test techniques for the IFMIF test cell

Wakai, Eiichi; Kim, B. J.; Nozawa, Takashi; Kikuchi, Takayuki; Hirano, Michiko*; Kimura, Akihiko*; Kasada, Ryuta*; Yokomine, Takehiko*; Yoshida, Takahide*; Nogami, Shuhei*; et al.

Proceedings of 24th IAEA Fusion Energy Conference (FEC 2012) (CD-ROM), 6 Pages, 2013/03

JAEA Reports

Corrosion and low-cycle fatigue behavior of FBR structural materials in sodium contaminated by oxygen

Yoshida, Eiichi; Kato, Shoichi; Furukawa, Tomohiro

JAEA-Research 2012-034, 68 Pages, 2013/01

JAEA-Research-2012-034.pdf:11.75MB

Oxygen concentration in sodium is the important factor for the corrosion of FBR structural materials. In this study, the experiments have been done to clarify the effect of sodium contaminated by oxygen on corrosion and low cycle fatigue strength of the materials. The materials for use of the experiments were FBR Grade type 316 SS (316FR) and Mod. 9Cr-1Mo steel. The corrosion test has been performed in sodium containing of 1, 10$$^{3}$$ and 10$$^{4}$$ ppm of initial oxygen at 650$$^{circ}$$C for 500 hours. The fatigue test has been done for the post-immersed steels at 650$$^{circ}$$C in air.

JAEA Reports

Accumulation of experiences and knowledge for sodium cleaning treatment technology

Yoshida, Eiichi; Hirakawa, Yasushi; Yatabe, Toshio

JAEA-Technology 2012-033, 177 Pages, 2012/11

JAEA-Technology-2012-033.pdf:17.98MB

In JAEA, lots of tests using sodium had been carried out on the development of sodium component systems and sodium technologies for the experimental reactor JOYO and prototype reactor MONJU. When research and development has come to the end of the first stage for these reactors, those sodium test facilities has dismantled and attached sodium has been cleaned. Lots of experiences and knowledge of sodium cleaning treatment technologies has accumulated. In order to use those experiences and knowledge effectively for future sodium technology and research on the next generation fast reactors, experiences and knowledge of sodium technologies for typical systems and components has been evaluated and knowledge related important topics has been rearranged. Based on those evaluation and rearrangement, technical guidelines of sodium cleaning treatment technologies has been proposed for the purpose of effective reference of the past experiences and knowledge.

Journal Articles

New developments of the Thomson scattering diagnostic system in magnetic-confined plasma devices

Hatae, Takaki; Yoshida, Hidetsugu*; Yatsuka, Eiichi

Purazuma, Kaku Yugo Gakkai-Shi, 88(10), p.555 - 574, 2012/10

no abstracts in English

Journal Articles

Development of a YAG laser system for the edge Thomson scattering system in ITER

Hatae, Takaki; Yatsuka, Eiichi; Hayashi, Toshimitsu; Yoshida, Hidetsugu*; Ono, Takehiro; Kusama, Yoshinori

Review of Scientific Instruments, 83(10), p.10E344_1 - 10E344_3, 2012/10

 Times Cited Count:10 Percentile:48.68(Instruments & Instrumentation)

A prototype YAG laser system for the edge Thomson scattering system in ITER has been newly developed. Performance of the laser amplifier was improved by using flow tubes made of samarium-doped glass; the small signal gain reached 20 at its maximum. As a result, an output energy of 7.66 J at 100 Hz was successfully achieved, and the performance exceeded the target performance (5 J, 100 Hz).

Journal Articles

Erosion of $$N$$=20 shell in $$^{33}$$Al investigated through the ground-state electric quadrupole moment

Shimada, Kenji*; Ueno, Hideki*; Neyens, G.*; Asahi, Koichiro*; Balabanski, D. L.*; Daugas, J. M.*; Depuydt, M.*; De Rydt, M.*; Gaudefroy, L.*; Gr$'e$vy, S.*; et al.

Physics Letters B, 714(2-5), p.246 - 250, 2012/08

 Times Cited Count:6 Percentile:58.11(Astronomy & Astrophysics)

no abstracts in English

Journal Articles

Material performance in sodium

Furukawa, Tomohiro; Yoshida, Eiichi

Comprehensive Nuclear Materials, 5, p.327 - 341, 2012/03

This manuscript is an explanation about the compatibility of FBR materials with sodium. This will be published in the book "Comprehensive Nuclear Materials" from Elsevier in 2012. Corrosion mechanism of materials in sodium, corrosion behaviour and factors effecting steel, effect of sodium on mechanical strength of steels, damage to steels with sodium compounds and tribology are described in this manuscript.

Journal Articles

Corrosion issues in sodium-cooled fast reactor (SFR) systems

Yoshida, Eiichi; Furukawa, Tomohiro

Nuclear Corrosion Science and Engineering, p.773 - 806, 2012/00

For sodium cooled fast reactor systems, the effect of sodium environment on corrosion and mechanical properties of the structural materials have to be evaluated to maintain the material integrity throughout the plant design life. In this paper, the effect of sodium on the mechanical strength, such as creep and fatigue, which is the dominant factor of corrosion was evaluated based on the related R&D results. Furthermore, the friction and self-welding phenomena in sodium were also described.

JAEA Reports

High-cycle fatigue properties of FBR grade type 316ss at elevated temperatures

Kato, Shoichi; Furukawa, Tomohiro; Yoshida, Eiichi

JAEA-Research 2010-022, 37 Pages, 2010/08

JAEA-Research-2010-022.pdf:7.57MBJP, 2005-087548   Patent publication (In Japanese)

It is known that the cyclic thermal stress caused by the thermal striping is occurred at the parts which the coolant of the different temperatures mixes in FBR plants, and the maximum number of cycles in the service life reaches to 10$$^{8}$$-10$$^{9}$$ cycles. So, it is important to understand experimentally the relationship between the mechanical strength and the damage mechanism in the high cycle fatigue region. This report summarizes about the results of the high cycle fatigue properties of a candidate material for FBR structures, FBR grade type 316 stainless steel (316FR).

Journal Articles

Development of prototype YAG laser amplifier for the edge Thomson scattering system in ITER

Hatae, Takaki; Hayashi, Toshimitsu; Yatsuka, Eiichi; Kajita, Shin*; Yoshida, Hidetsugu*; Fujita, Hisanori*; Nakatsuka, Masahiro*; Yahagi, Kenichi*; Shinobu, Katsuya*; Ono, Takehiro; et al.

Journal of Plasma and Fusion Research SERIES, Vol.9, p.253 - 258, 2010/08

Journal Articles

Ultrafast pulse radiolysis methods

Belloni, J.*; Crowell, R. A.*; Katsumura, Yosuke; Lin, M.; Marignier, J. L.*; Mostafavi, M.*; Muroya, Yusa*; Saeki, Akinori*; Tagawa, Seiichi*; Yoshida, Yoichi*; et al.

Recent Trends in Radiation Chemistry, p.121 - 160, 2010/05

In this review, we summarized development and application of highly time resolved spectroscopy system in order to measure radiation induced fast phenomena together with current status of the systems in the world.

Journal Articles

Compatibility of FBR materials with sodium

Furukawa, Tomohiro; Kato, Shoichi; Yoshida, Eiichi

Journal of Nuclear Materials, 392(2), p.249 - 254, 2009/07

 Times Cited Count:29 Percentile:9.68(Materials Science, Multidisciplinary)

In order to incorporate an evaluation procedure for sodium environmental effects of core and structural materials into the elevated temperature structural design guide for fast breeder reactors (FBRs), research and development of sodium compatibility of the materials has been performing in Japan Atomic Energy Agency. This paper describes the overview of sodium compatibility of the candidate materials which are used as core and structures of Japanese demonstration FBRs.

Journal Articles

Status of engineering design of liquid lithium target in IFMIF-EVEDA

Nakamura, Hiroo; Agostini, P.*; Ara, Kuniaki; Fukada, Satoshi*; Furuya, Kazuyuki*; Garin, P.*; Gessii, A.*; Giusti, D.*; Groeschel, F.*; Horiike, Hiroshi*; et al.

Fusion Engineering and Design, 84(2-6), p.252 - 258, 2009/06

 Times Cited Count:25 Percentile:12.45(Nuclear Science & Technology)

JAEA Reports

Material test data of Mod.9Cr-1Mo steel, 1

Kato, Shoichi; Furukawa, Tomohiro; Yoshida, Eiichi

JAEA-Data/Code 2008-030, 89 Pages, 2009/02

JAEA-Data-Code-2008-030.pdf:3.41MB

Mod.9Cr-1Mo steel is a candidate for structural materials of future advanced Fast Breeder Reactors (FBR), because of good thermal properties and high creep strength. Material test of Mod.9Cr-1Mo steel, which was candidated for structure materials of the future advanced FBR has been performed in Technology Development Department. In this report, the result of test obtained up to this time was collected.

155 (Records 1-20 displayed on this page)