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Journal Articles

Radioactivity and radionuclides in deciduous teeth formed before the Fukushima-Daiichi Nuclear Power Plant accident

Takahashi, Atsushi*; Chiba, Mirei*; Tanahara, Akira*; Aida, Jun*; Shimizu, Yoshinaka*; Suzuki, Toshihiko*; Murakami, Shinobu*; Koarai, Kazuma; Ono, Takumi*; Oka, Toshitaka; et al.

Scientific Reports (Internet), 11(1), p.10355_1 - 10355_11, 2021/05

 Times Cited Count:1 Percentile:65.97(Multidisciplinary Sciences)

Journal Articles

Progress report of Japanese simulation research projects using the high-performance computer system Helios in the International Fusion Energy Research Centre

Ishizawa, Akihiro*; Idomura, Yasuhiro; Imadera, Kenji*; Kasuya, Naohiro*; Kanno, Ryutaro*; Satake, Shinsuke*; Tatsuno, Tomoya*; Nakata, Motoki*; Nunami, Masanori*; Maeyama, Shinya*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 92(3), p.157 - 210, 2016/03

The high-performance computer system Helios which is located at The Computational Simulation Centre (CSC) in The International Fusion Energy Research Centre (IFERC) started its operation in January 2012 under the Broader Approach (BA) agreement between Japan and the EU. The Helios system has been used for magnetised fusion related simulation studies in the EU and Japan and has kept high average usage rate. As a result, the Helios system has contributed to many research products in a wide range of research areas from core plasma physics to reactor material and reactor engineering. This project review gives a short catalogue of domestic simulation research projects. First, we outline the IFERC-CSC project. After that, shown are objectives of the research projects, numerical schemes used in simulation codes, obtained results and necessary computations in future.

Journal Articles

Degradation of charge collection efficiency for 6H-SiC diodes by electron irradiation

Iwamoto, Naoya; Onoda, Shinobu; Hishiki, Shigeomi; Oshima, Takeshi; Murakami, Makoto*; Nakano, Itsuo*; Kawano, Katsuyasu*

Materials Science Forum, 600-603(Part 2), p.1043 - 1046, 2009/00

The 6H-SiC n$$^{+}$$p diodes were fabricated on a p-type substrate. To clarify the radiation resistance of the device performance, the diodes were irradiated with 1MeV-electrons at fluence up to 6$$times$$10$$^{16}$$/cm$$^{2}$$ and the Charge Collection Efficiencies (CCEs) and diffusion length (L) of minority carriers were evaluated from the evaluation of the Transient Ion Beam Induced Current (TIBIC). The saturated CCE of 93% was obtained for non-electron irradiated diodes, and the value of CCE was kept up to electron fluences of 1$$times$$10$$^{15}$$/cm$$^{2}$$, although L decreased to 0.6$$mu$$m from 2.5$$mu$$m by the irradiation. The degradation of CCE was observed at fluences above 5$$times$$10$$^{15}$$/cm$$^{2}$$.

Journal Articles

Charge collection properties of 6H-SiC diodes by wide variety of charged particles up to several hundreds MeV

Onoda, Shinobu; Iwamoto, Naoya; Murakami, Makoto; Oshima, Takeshi; Hirao, Toshio; Kojima, Kazutoshi*; Kawano, Katsuyasu*; Nakano, Itsuo*

Materials Science Forum, 615-617, p.861 - 864, 2009/00

no abstracts in English

Journal Articles

Charge collection efficiency of 6H-SiC diodes damaged by electron irradiation

Iwamoto, Naoya; Oshima, Takeshi; Onoda, Shinobu; Hishiki, Shigeomi*; Murakami, Makoto; Nakano, Itsuo*; Kawano, Katsuyasu*

Proceedings of the 26th Symposium on Materials Science and Engineering, Research Center of Ion Beam Technology Hosei University, p.27 - 30, 2007/12

no abstracts in English

Journal Articles

Diffuse neutron scattering from AgBr; Application to Rietveld refinements

Sakuma, Takaaki*; Nakamura, Y.*; Hirota, M.*; Murakami, A.*; Ishii, Yoshinobu

Solid State Ionics, 127(3-4), p.295 - 300, 2000/01

 Times Cited Count:8 Percentile:45.53(Chemistry, Physical)

no abstracts in English

Journal Articles

Scattering intensity from crystalline and non-crystalline materials including correlations of thermal displacements of atoms

Sakuma, T.*; *; Murakami, A.*; *; Ishii, Yoshinobu

High Temp. Mater. Process., 18(1-2), p.41 - 48, 1999/00

no abstracts in English

Oral presentation

Magnetic ordering process in the charge-frustrated ferroelectric system LuFe$$_{2}$$O$$_{4}$$

Kakurai, Kazuhisa; Ikeda, Naoshi*; Nagai, Satoshi*; Matsuda, Masaaki; Ishii, Yoshinobu; Owada, Kenji; Inami, Toshiya; Yoshii, Kenji; Murakami, Yoichi*; Kito, Hijiri*; et al.

no journal, , 

We report in this paper an anomalous magnetic ordering process in the charge ordered LuFe$$_{2}$$O$$_{4}$$. The neutron scattering experiments were performed on TAS-1 and TAS-2 instruments installed at JAEA-JRR-3. The following results are obtained:1) Despite the triangular configuration a strong 2-D antiferromagnetic correlation with ferrimagnetic component in the double layer in the hexagonal plane develops to a 3-D order along the c-axis at T$$_{N}$$=242K.2) At around 177K there is another characteristic temperature T$$_{f}$$, where new type of broad magnetic peaks start to grow and at the same time the magnetic peaks already developed below T$$_{N}$$ also acquire finite line width, including the peaks due to the ferrimagnetic component. A strong hysteresis is observed at T$$_{f}$$. The existence of the anomalous magnetic ground state will be demonstrated and the possible relation to the orbital degree of freedom will be discussed.

Oral presentation

Neutron scattering studies on ferroelectric, charge and spin frustrated layered triangular system LuFe$$_{2}$$O$$_{4}$$

Kakurai, Kazuhisa; Ikeda, Naoshi*; Nagai, Satoshi*; Matsuda, Masaaki; Ishii, Yoshinobu; Owada, Kenji; Inami, Toshiya; Yoshii, Kenji; Murakami, Yoichi*; Kito, Hijiri*; et al.

no journal, , 

The observation of an anomalous magnetic ordering process in the charge ordered LuFe$$_{2}$$O$$_{4}$$ by means of neutron scattering is reported. The neutron scattering experiments were performed on TAS-1 and TAS-2 instruments installed at JAEA-JRR-3. Despite the triangular configuration a strong 2-D antiferromagnetic correlation with ferrimagnetic component in the double layer in the hexagonal plane develops to a 3-D order along the c-axis at T$$_{N}$$=242K. At around 177K another characteristic temperature T$$_{f}$$ was discovered where new type of broad magnetic peaks start to grow and at the same time the magnetic peaks already developed below T$$_{N}$$ also acquire finite line width, including the peaks due to the ferrimagnetic component. Field dependence of T$$_{f}$$ was investigated. Upon applying the field perpendicular to the layer plane, T$$_{f}$$ decreases and vanishes above 3T. The existence of the anomalous magnetic ground state will be demonstrated and discussed.

Oral presentation

Field dependence of the magnetic ordering process in layered triangular system LuFe$$_{2}$$O$$_{4}$$

Kakurai, Kazuhisa; Ikeda, Naoshi*; Nagai, Satoshi*; Matsuda, Masaaki; Ishii, Yoshinobu; Owada, Kenji; Inami, Toshiya; Yoshii, Kenji; Murakami, Yoichi*; Kito, Hijiri*; et al.

no journal, , 

The field dependence of the anomalous magnetic ordering process in the charge ordered LuFe$$_{2}$$O$$_{4}$$ by means of neutron scattering is reported. Despite the triangular configuration a strong 2-D antiferromagnetic correlation with ferrimagnetic component in the double layer in the hexagonal plane develops to a 3-D order along the c-axis at T$$_{N}$$=242K. At around 177K another characteristic temperature T$$_{f}$$ was discovered where new type of broad magnetic peaks start to grow and at the same time the magnetic peaks already developed below T$$_{N}$$ also acquire finite line width, including the peaks due to the ferrimagnetic component. Field dependence of T$$_{f}$$ was investigated. Upon applying the field perpendicular to the layer plane, T$$_{f}$$ decreases and vanishes above 3T.

Oral presentation

Magnetic ordering process in the charge-frustrated ferroelectric system LuFe$$_{2}$$O$$_{4}$$

Kakurai, Kazuhisa; Ikeda, Naoshi*; Nagai, Satoshi*; Matsuda, Masaaki; Ishii, Yoshinobu; Owada, Kenji; Inami, Toshiya; Yoshii, Kenji; Murakami, Yoichi*; Kito, Hijiri*; et al.

no journal, , 

no abstracts in English

Oral presentation

Charge collection efficiency for electron irradiated 6H-SiC PN diodes

Iwamoto, Naoya; Onoda, Shinobu; Hishiki, Shigeomi; Oshima, Takeshi; Murakami, Makoto*; Nakano, Itsuo*; Kawano, Katsuyasu*

no journal, , 

no abstracts in English

Oral presentation

Magnetic ordering process in the charge frustrated ferroelectric LuFe$$_{2}$$O$$_{4}$$

Kakurai, Kazuhisa; Ikeda, Naoshi*; Nagai, Satoshi*; Matsuda, Masaaki; Ishii, Yoshinobu*; Owada, Kenji; Inami, Toshiya; Yoshii, Kenji; Murakami, Yoichi*; Kito, Hijiri*; et al.

no journal, , 

Recently the investigation of multiferroic systems showing strong correlation between the magnetic and ferroelectric ordering is attracting much attention. The temperature variation of the electric polarization in LuFe$$_{2}$$O$$_{4}$$ indicates such a strong correlation. The magnetic ordering process of this ferrimagnetic system is complex showing a frozen spin ground state in zero field. We have investigated the field dependence of the magnetic ordering process and discovered that the frozen state is suppressed upon application of the magnetic field in the stacking direction of this layered compound.

Oral presentation

Electron irradiation effects on charge collection efficiency for 6H-SiC n$$^{+}$$p diodes

Iwamoto, Naoya; Oshima, Takeshi; Onoda, Shinobu; Hishiki, Shigeomi*; Murakami, Makoto

no journal, , 

no abstracts in English

Oral presentation

Application of partitioning and transmutation technology to waste management; An Attempt to assess total performance of advanced nuclear fuel cycle, 5; A Trial assessment for fast reactor cycle

Watanabe, So; Sasa, Toshinobu; Owada, Hitoshi*; Saito, Takumi*; Ishio, Takahiro*; Murakami, Tsuyoshi*; Shimada, Takashi*

no journal, , 

no abstracts in English

Oral presentation

Application of partitioning and transmutation technology to waste management; Assessment of total performance of advanced nuclear fuel cycle, 4; Assessment for fast reactor cycle

Watanabe, So; Sasa, Toshinobu; Owada, Hitoshi*; Saito, Takumi*; Ishio, Takahiro*; Murakami, Tsuyoshi*; Shimada, Takashi*

no journal, , 

no abstracts in English

16 (Records 1-16 displayed on this page)
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