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Journal Articles

Defect formation and accumulation in CeO$$_{2}$$ irradiated with swift heavy ions

Yasuda, Kazuhiro*; Eto, Motoki*; Sawada, Kenichi*; Yamamoto, Tomokazu*; Yasunaga, Kazufumi*; Matsumura, Sho*; Ishikawa, Norito

Nuclear Instruments and Methods in Physics Research B, 314, p.185 - 190, 2013/11

 Times Cited Count:33 Percentile:92.77(Instruments & Instrumentation)

We have investigated microstructure evolution in CeO$$_{2}$$ irradiated with 210 MeV Xe ions by using transmission electron microscopy to gain the fundamental knowledge on radiation damage induced by fission fragments in nuclear fuel and transmutation target.

Journal Articles

Change in magnetic properties induced by swift heavy ion irradiation in CeO$$_{2}$$

Shimizu, Hirotaka*; Kosugi, Shinya*; Tahara, Yuki*; Yasunaga, Kazufumi*; Kaneta, Yasunori*; Ishikawa, Norito; Hori, Fuminobu*; Matsui, Toshiyuki*; Iwase, Akihiro*

Nuclear Instruments and Methods in Physics Research B, 286, p.291 - 294, 2012/09

 Times Cited Count:26 Percentile:87.1(Instruments & Instrumentation)

We have studied the magnetic properties of pure CeO$$_{2}$$ irradiated with swift heavy ions. Experiment a results showed that the ferromagnetism was induced even at room temperature by 200 MeV Xe ion irradiation. The value of saturation magnetization, Ms, systematically changes as a function of ion-fluence. The X-ray diffraction (XRD) spectra show that the lattice constant of CeO$$_{2}$$ increases with increasing ion-fluence. This result and our previous XPS result show that the ion-irradiation produced oxygen vacancies. The present study implies that the ferromagnetic behavior of the ion-irradiated CeO$$_{2}$$ is attributed to the magnetic moments of localized 4f electrons on Ce$$^{3+}$$ atoms, which are related to oxygen vacancies.

Journal Articles

Clarification of the properties and accumulation effects of ion tracks in CeO$$_{2}$$

Sonoda, Takeshi*; Kinoshita, Motoyasu*; Ishikawa, Norito; Sataka, Masao; Chimi, Yasuhiro; Okubo, Nariaki; Iwase, Akihiro*; Yasunaga, Kazufumi*

Nuclear Instruments and Methods in Physics Research B, 266(12-13), p.2882 - 2886, 2008/06

 Times Cited Count:31 Percentile:87.1(Instruments & Instrumentation)

High-energy particle irradiation effects of CeO$$_{2}$$ is investigated using electron microscopy. It is found that ion track is formed only when the electronic energy transfer exceeds 16 keV/nm.

Journal Articles

Study of irradiation induced restructuring of high burnup fuel; The New cross-over project (NXO) to study rim-structure formation

Kinoshita, Motoyasu*; Geng, H. Y.*; Chen, Y.*; Kaneta, Yasunori*; Iwasawa, Misako*; Onuma, Toshiharu*; Sonoda, Takeshi*; Yasunaga, Kazufumi*; Matsumura, Sho*; Yasuda, Kazuhiro*; et al.

Proceedings of 2006 International Meeting on LWR Fuel Performance (TopFuel 2006) (CD-ROM), p.248 - 254, 2006/10

The New Crossover Project (NXO) is studying effect of fission irradiation on fuel material that research activity is crossing over universities, national and private laboratories. Simulation studies are being performed to find principal and triggering processes of the rim-structure formation in high burnup LWR fuel pellet, using accelerator irradiation and computational calculations. Accelerator irradiation, high energy electron irradiation, fission energy particle beam and ion implantation (ragegas atoms) and combined overlapping irradiations are being performed. For the target of irradiation, CeO$$_{2}$$ isused as simulation of nuclear fuel. The initial results were such as planar structure made by Oxygen defects created by high energy electrons, and surface modification similar to grain-sub-division created by high fluence high energy particle irradiations.

Journal Articles

Thermal desorption of deuterium from ion irradiated Be$$_{12}$$Ti

Iwakiri, Hirotomo*; Yasunaga, Kazufumi*; Yoshida, Naoaki*; Uchida, Munenori*; Kawamura, Hiroshi

Journal of Nuclear Materials, 329-333(Part A), p.880 - 884, 2004/00

 Times Cited Count:7 Percentile:45.21(Materials Science, Multidisciplinary)

no abstracts in English

Oral presentation

New cross-over project, "New engineering to control materials behavior at high energy and high fluence irradiation, 4; Development of experimental simulation technique using ion accelerator

Sataka, Masao; Ishikawa, Norito; Chimi, Yasuhiro; Okubo, Nariaki; Sonoda, Takeshi*; Matsumura, Sho*; Yasuda, Kazuhiro*; Yasunaga, Kazufumi*; Shiiyama, Kenichi*; Abe, Hiroaki*; et al.

no journal, , 

no abstracts in English

Oral presentation

New cross-over project, "New engineering to control materials behavior at high energy and high fluence irradiation", 5; Microstructure observation and analysis of irradiated ceramic compounds with the fluorite crystal structure

Matsumura, Sho*; Yasuda, Kazuhiro*; Yasunaga, Kazufumi*; Shiiyama, Kenichi*; Sonoda, Takeshi*; Abe, Hiroaki*; Iwai, Takeo*; Sataka, Masao; Ishikawa, Norito; Chimi, Yasuhiro; et al.

no journal, , 

no abstracts in English

Oral presentation

Recovery induced by high-density electronic excitations in CeO$$_{2}$$ pre-implanted with Xe ions

Yasunaga, Kazufumi*; Sonoda, Takeshi*; Yasuda, Kazuhiro*; Shiiyama, Kenichi*; Matsumura, Sho*; Sataka, Masao; Ishikawa, Norito; Chimi, Yasuhiro; Okubo, Nariaki; Iwase, Akihiro*; et al.

no journal, , 

Irradiation experiments were performed for CeO$$_{2}$$ using ion accelerators. CeO$$_{2}$$ were first pre-implanted with 2at.% Xe and furthermore heavily irradiated with high-energy heavy ions, and as a result restructuring of dislocation has been found.

Oral presentation

New cross-over project study, 6; High density electronic excitation effects in Xe-ions-implanted fluorite ceramics as simulations of high burnup nuclear fuels

Sonoda, Takeshi*; Ishikawa, Norito; Sataka, Masao; Okubo, Nariaki; Yasunaga, Kazufumi*; Yasuda, Kazuhiro*; Shiiyama, Kenichi*; Matsumura, Sho*; Iwase, Akihiro*; Kinoshita, Motoyasu*

no journal, , 

In order to elucidate the radiation damage in nuclear fuel, simulation material CeO$$_{2}$$ has been irradiated with ions and its damage has been investigated. It is found that by 210MeV Xe irradiation subdivision of crystals is promoted, and Xe-preimplantation accelerates it.

Oral presentation

Recovery and restructuring induced by fission energy ions in high burnup nuclear fuel

Kinoshita, Motoyasu; Yasunaga, Kazufumi*; Sonoda, Takeshi*; Iwase, Akihiro*; Ishikawa, Norito; Sataka, Masao; Yasuda, Kazuhiro*; Matsumura, Sho*; Geng, H. Y.*; Ichinomiya, Takashi*; et al.

no journal, , 

We show the outline of achievements of New Cross Over (NXO) project. Concerning the grain subdivision of ceramics fuel at high burnup, we are trying to clarify the mechanisms and to develop the simulation methods. The main high lights are as follow as: (1) We have reproduced the grain subdivision of CeO$$_{2}$$, by means of ion implanter and TUNDEM accelerator. (2) We performed computational science study concerning the relocation of oxygen. In case of oxygen exess conditions, first principal calculation reproduced the orderring structure. TAD calculation shows that the exess oxygen compose clusters and diffuses rapidly even if low temperature.

Oral presentation

New cross-over project study, 2; Ion irradiation examination on UO$$_{2}$$ and CeO$$_{2}$$ for clarification of grain sub-division mechanism in high burnup fuels

Sonoda, Takeshi*; Ishikawa, Norito; Sataka, Masao; Okubo, Nariaki; Yasunaga, Kazufumi*; Yasuda, Kazuhiro*; Shiiyama, Kenichi*; Matsumura, Sho*; Iwase, Akihiro*; Kinoshita, Motoyasu

no journal, , 

Ion irradiation was performed for CeO$$_{2}$$ and UO$$_{2}$$. Same kind of microstructure change is observed for both of the oxide materials.

Oral presentation

New cross over project study, 3; Effect of Xe accumulation in CeO$$_{2}$$ irradiated with swift heavy ions

Yasunaga, Kazufumi*; Sonoda, Takeshi*; Yasuda, Kazuhiro*; Shiiyama, Kenichi*; Matsumura, Sho*; Sataka, Masao; Ishikawa, Norito; Chimi, Yasuhiro; Kinoshita, Motoyasu

no journal, , 

In order to study the elementary damage process of high burnup structure of light water reactor, ion implantation and ion irradiation were performed for CeO$$_{2}$$. It is suggested from the observation of electron microscopy that Xe gas suppress movement of dislocation in CeO$$_{2}$$.

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