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Journal Articles

Neutron scattering study of yttrium iron garnet

Shamoto, Shinichi; Ito, Takashi; Onishi, Hiroaki; Yamauchi, Hiroki; Inamura, Yasuhiro; Matsuura, Masato*; Akatsu, Mitsuhiro*; Kodama, Katsuaki; Nakao, Akiko*; Moyoshi, Taketo*; et al.

Physical Review B, 97(5), p.054429_1 - 054429_9, 2018/02

 Times Cited Count:10 Percentile:63.24(Materials Science, Multidisciplinary)

Nuclear and magnetic structure and full magnon dispersions of yttrium iron garnet Y$$_3$$Fe$$_5$$O$$_{12}$$ have been studied by neutron scattering. The lowest-energy dispersion below 14 meV exhibits a quadratic dispersion as expected from ferromagnetic magnons. The imaginary part of $$q$$-integrated dynamical spin susceptibility $$chi$$"($$E$$) exhibits a square-root energy-dependence in the low energies. The magnon density of state is estimated from the $$chi$$"($$E$$) obtained on an absolute scale. The value is consistent with a single chirality mode for the magnon branch expected theoretically.

JAEA Reports

Research of flaw assessment method for beryllium reflector elements

Shibata, Akira; Ito, Masayasu; Takemoto, Noriyuki; Nakatsuka, Masafumi*; Ohara, Hiroshi*; Kodama, Mitsuhiro*; Tanimoto, Masataka; Tsuchiya, Kunihiko

JAEA-Technology 2011-034, 67 Pages, 2012/02

JAEA-Technology-2011-034.pdf:6.94MB

Reflector elements made from metal beryllium is widely used as neutron reflectors to increase neutron flux in test reactors. When beryllium reflector elements are irradiated by neutron, bending of reflector elements caused by swelling occurs, and beryllium reflector elements must be replaced in several years. In this report, investigation for non-destructive inspection method of metal Beryllium and experiments for Preliminary inspection to establish post irradiation examination method for research of characteristics of metal beryllium under neutron irradiation were reported.

JAEA Reports

Investigation for methods of micro-structural observation of beryllium metals by TEM

Ito, Masayasu; Kawamata, Kazuo; Sozawa, Shizuo; Shibata, Akira; Tsuchiya, Kunihiko; Kitsunai, Yuji*; Kodama, Mitsuhiro*

JAEA-Testing 2011-003, 22 Pages, 2011/06

JAEA-Testing-2011-003.pdf:9.16MB

In JMTR, beryllium metal is used for neutron reflector. However, the periodical exchange of the neutron reflector is necessary due to degradation of strength and swelling under neutron irradiation. So it is required to select the material that bears long term from the viewpoint of the utilization rate improvement and the radioactive waste decrease in JMTR. It is important to evaluate the characteristics of beryllium metals precisely. This report describes the preparation method of the sample and observation results by the transmission electron microscope that is being examined as a evaluation method of the beryllium metal.

Oral presentation

Study for the SCC degradation incorporating dose rate effects, 1

Okita, Taira*; Koshiishi, Masato*; Hashimoto, Tsuneyuki*; Tanaka, Shigeaki*; Kodama, Mitsuhiro*; Kondo, Keietsu; Tsukada, Takashi

no journal, , 

no abstracts in English

Oral presentation

Status of beryllium reflector development in JMTR

Dorn, C. K.*; Tsuchiya, Kunihiko; Hatano, Yuji*; Chakrov, P.*; Kodama, Mitsuhiro*; Kawamura, Hiroshi

no journal, , 

no abstracts in English

Oral presentation

Study on release and transport of aerial radioactive materials in reprocessing plant, 2; Cooling system of high active liquid waste and loss of cooling event

Sekine, Keiji*; Fujita, Kunio*; Kodama, Takashi*; Tamauchi, Yoshikazu*; Uchiyama, Gunzo; Yoshida, Kazuo; Yamane, Yuichi; Ueda, Yoshinori*; Takanashi, Mitsuhiro*

no journal, , 

A study on the release and transport of aerial radioactive materials in reprocessing plants was started. The cooling system of high active liquid waste in reprocessing plants and the release and transport of aerial radioactive materials in reprocessing plants at loss of cooling events were surveyed.

Oral presentation

Magnon density of states and the dispersions of Y$$_{3}$$Fe$$_{5}$$O$$_{12}$$

Shamoto, Shinichi; Ito, Takashi; Onishi, Hiroaki; Mori, Michiyasu; Matsuura, Masato*; Akatsu, Mitsuhiro*; Nakamura, Mitsutaka; Inamura, Yasuhiro; Yamauchi, Hiroki; Nakao, Akiko*; et al.

no journal, , 

no abstracts in English

Oral presentation

High-energy magnon dispersions and their simulations of Y$$_{3}$$Fe$$_{5}$$O$$_{12}$$

Shamoto, Shinichi; Ito, Takashi; Onishi, Hiroaki; Matsuura, Masato*; Akatsu, Mitsuhiro*; Nakamura, Mitsutaka; Inamura, Yasuhiro; Kodama, Katsuaki; Kawamura, Seiko; Nemoto, Yuichi*; et al.

no journal, , 

no abstracts in English

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