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Journal Articles

Measurement of divergence angles classified by charge-state combination of C$$_2$$$$^+$$ constituents passing through a thin carbon foil

Chiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa; Takahashi, Yasuyuki; Yamada, Keisuke; Kaneko, Toshiaki*

Nuclear Instruments and Methods in Physics Research B, 269(9), p.824 - 828, 2011/05

https://doi.org/10.1016/j.nimb.2010.12.002
 Times Cited Count：3 Percentile：25.93(Instruments & Instrumentation)

It is necessary to clarify the relationship between the internuclear distance of the cluster constituent ions and these charge states for the elucidation of mechanism of the vicinage effects which are expressed due to the interaction with matter. Therefore the coincidence measurement between divergence angles and final charge states of the constituent ions resulting from dissociation of 6-MeV C$$_2$$$$^+$$ ions in a thin carbon foil were performed. The strong dependence of the final charge state of constituent ions on the initial internuclear distance of projectile ion was quantitatively indicated by the fitting analysis of the angular distributions for various final charge-state combinations using the Monte Carlo particle trajectory simulation.

Oral presentation

Analysis of bombardment effect of 10-to-100-keV C$$_{60}$$ ions on a Si surface

Narumi, Kazumasa; Naramoto, Hiroshi*; Takahashi, Yasuyuki; Yamada, Keisuke; Chiba, Atsuya; Saito, Yuichi; Maeda, Yoshihito

no journal, , 

Oral presentation

Molecular-axis-orientation dependence of vicinage effect on secondary-electron emission from thin carbon foils bombarded with 250-keV/u C$$_{2}$$$$^{+}$$ ions

Takahashi, Yasuyuki; Narumi, Kazumasa; Chiba, Atsuya; Saito, Yuichi; Yamada, Keisuke; Ishikawa, Norito; Sugai, Hiroyuki; Sakai, Seiji; Maeda, Yoshihito

no journal, , 

no abstracts in English

Oral presentation

Study on effects of swift heavy ion irradiation on the crystal structure in CeO$$_{2}$$ doped with Gd$$_{2}$$O$$_{3}$$

Tahara, Yuki*; Zhu, B.-L.*; Kosugi, Shinya*; Ishikawa, Norito; Okamoto, Yoshihiro; Baba, Yuji; Hirao, Norie; Hori, Fuminobu*; Matsui, Toshiyuki*; Iwase, Akihiro*

no journal, , 

In present light-water nuclear power plants, it is useful to dope some elements, which have a high neutron absorption cross section, into fuels (UO$$_{2}$$) in order to control the initial reactivity. During the operation of reactors, UO$$_{2}$$ fuels are exposed to irradiation with high energy fission products which have energies around 100 MeV. Therefore, it is important to study the effects of high energy fission products on UO$$_{2}$$ fuels. Cerium dioxide (CeO$$_{2}$$) has been used so far as a simulation material for UO$$_{2}$$ because it has the same fluorite structure as that of UO$$_{2}$$. In this study, CeO$$_{2}$$ pellets doped with Gd$$_{2}$$O$$_{3}$$ were irradiated with 200 MeV Xe$$^{14+}$$ ions to simulate the irradiation effects of high energy fission products on UO$$_{2}$$ doped with Gd$$_{2}$$O$$_{3}$$. The X-ray diffraction spectra show that the lattice constant of CeO$$_{2}$$ increases with increasing the amount of the Gd-doping. In addition, it also increases by the irradiation and the effect of the irradiation becomes more remarkable by doping Gd$$_{2}$$O$$_{3}$$.

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