JOPSS - Search Results

Journal Articles

Rabi-oscillation spectroscopy of the hyperfine structure of muonium atoms

Nishimura, Shoichiro*; Torii, Hiroyuki*; Fukao, Yoshinori*; Ito, Takashi; Iwasaki, Masahiko*; Kanda, Sotaro*; Kawagoe, Kiyotomo*; Kawall, D.*; Kawamura, Naritoshi*; Kurosawa, Noriyuki*; et al.

Physical Review A, 104(2), p.L020801_1 - L020801_6, 2021/08

https://doi.org/10.1103/PhysRevA.104.L020801

Times Cited Count：13 Percentile：83.13(Optics)

Journal Articles

First nuclear transmutation of $^{237}$ Np and $^{241}$ Am by accelerator-driven system at Kyoto University Critical Assembly

Pyeon, C. H.*; Yamanaka, Masao*; Oizumi, Akito; Fukushima, Masahiro; Chiba, Go*; Watanabe, Kenichi*; Endo, Tomohiro*; Van Rooijen, W. G.*; Hashimoto, Kengo*; Sakon, Atsushi*; et al.

Journal of Nuclear Science and Technology, 56(8), p.684 - 689, 2019/08

https://doi.org/10.1080/00223131.2019.1618406

Times Cited Count：12 Percentile：80.27(Nuclear Science & Technology)

This study demonstrates, for the first time, the principle of nuclear transmutation of minor actinide (MA) by the accelerator-driven system (ADS) through the injection of high-energy neutrons into the subcritical core at the Kyoto University Critical Assembly. The main objective of the experiments is to confirm fission reactions of neptunium-237 ( $^{237}$ Np) and americium-241 ( $^{241}$ Am), and capture reactions of $^{237}$ Np. Subcritical irradiation of $^{237}$ Np and $^{241}$ Am foils is conducted in a hard spectrum core with the use of the back-to-back fission chamber that obtains simultaneously two signals from specially installed test ( $^{237}$ Np or $^{241}$ Am) and reference (uranium-235) foils. The first nuclear transmutation of $^{237}$ Np and $^{241}$ Am by ADS soundly implemented by combining the subcritical core and the 100 MeV proton accelerator, and the use of a lead-bismuth target, is conclusively demonstrated through the experimental results of fission and capture reaction events.

Journal Articles

New precise measurements of muonium hyperfine structure at J-PARC MUSE

Strasser, P.*; Abe, Mitsushi*; Aoki, Masaharu*; Choi, S.*; Fukao, Yoshinori*; Higashi, Yoshitaka*; Higuchi, Takashi*; Iinuma, Hiromi*; Ikedo, Yutaka*; Ishida, Katsuhiko*; et al.

EPJ Web of Conferences, 198, p.00003_1 - 00003_8, 2019/01

https://doi.org/10.1051/epjconf/201919800003

Times Cited Count：13 Percentile：99.06(Quantum Science & Technology)

JAEA Reports

XAFS measurement of simulated waste glass samples prepared from borosilicate glass frit including phosphorus pentaoxide (Joint research)

Nagai, Takayuki; Kobayashi, Hidekazu; Shimamura, Keisuke; Oyama, Koichi; Sasage, Kenichi; Okamoto, Yoshihiro; Shiwaku, Hideaki; Yamanaka, Keisuke*; Ota, Toshiaki*

JAEA-Research 2018-005, 72 Pages, 2018/09

JAEA-Research-2018-005.pdf:28.2MB

Addition of radioactive waste to a borosilicate glass frit affects the local structures of glass-forming elements and waste elements in a waste glass produced in a vitrification process. In this study, simulated waste glass samples were prepared from borosilicate glass frit including phosphorus pentaoxide, and we investigated local structures of sodium (Na), boron (B), and waste elements in these glass samples by using synchrotron XAFS measurements in soft and hard X ray region.

JAEA Reports

XAFS measurement of simulated waste borosilicate glass samples (Joint research)

Nagai, Takayuki; Kobayashi, Hidekazu; Sasage, Kenichi; Ayame, Yasuo; Okamoto, Yoshihiro; Shiwaku, Hideaki; Yamanaka, Keisuke*; Ota, Toshiaki*

JAEA-Research 2017-005, 54 Pages, 2017/06

JAEA-Research-2017-005.pdf:16.17MB

Addition of radioactive waste to a borosilicate frit affects the local structures of boron (B) and waste elements in a waste glass. Synchrotron XAFS measurement was applied to investigate the local structural changes by using simulated waste borosilicate glass samples. Following results were obtained by the B K-edge XAFS analysis. It was confirmed that B K-edge XAFS analysis enables us to discriminate sp $^{2}$ type boron (BO $_{3}$ ) from sp $^{3}$ type boron (BO $_{4}$ ). Addition of waste elements to a glass frit increases the percentage of BO $_{3}$ and decreases that of BO $_{4}$ . By decreasing the SiO $_{2}$ /Al $_{2}$ O $_{3}$ ratio or increasing the (SiO $_{2}$ +B $_{2}$ O $_{3}$ )/Al $_{2}$ O $_{3}$ ratio in the glass composition, the BO $_{3}$ percentage increases and the BO $_{4}$ percentage decreases. Addition of P $_{2}$ O $_{5}$ decreases the BO $_{3}$ percentage and increases the BO $_{4}$ percentage. Following results were obtained from XAFS measurement of the waste elements. Cerium (Ce) valence is more reduced with the increase of the B $_{2}$ O $_{3}$ content. Addition of P $_{2}$ O $_{5}$ has a tendency to reduce the Ce valence and to enhance deposition of Zr oxide. Deposition of ruthenium compounds separated from glass phase can not be improved by changing the B $_{2}$ O $_{3}$ content. This study was performed as a part of the project, "Improvement of vitrification process of high-level radioactive liquid wastes" on the foundation business of the Agency for Natural Resources and Energy.

Journal Articles

Re-evaluation of the phase relationship between plutonium and zirconium dioxides

Serizawa, Hiroyuki; Nakajima, Kunihisa; Arai, Yasuo; Yamashita, Toshiyuki; Kuramoto, Kenichi; Kinoshita, H.*; Yamanaka, Shinsuke*; Uno, Masayoshi*; Kurosaki, K.*

Progress in Nuclear Energy, 38(3-4), p.237 - 240, 2001/02

https://doi.org/10.1016/S0149-1970(00)00107-4

Times Cited Count：5 Percentile：38.97(Nuclear Science & Technology)

no abstracts in English

Oral presentation

Development of advanced vitrification melter, 17; Accumulation behavior and particulate forms of noble metals in vitrified waste

Yamanaka, Atsushi; Miyauchi, Atsushi; Morikawa, Yo; Sasage, Kenichi; Yamashita, Teruo

no journal, ,

no abstracts in English

Oral presentation

Development of advanced vitrification melter; Accumulation behavior and particulate forms of noble metals in vitrified waste

Miyauchi, Atsushi; Yamanaka, Atsushi; Morikawa, Yo; Sasage, Kenichi; Yamashita, Teruo

no journal, ,

no abstracts in English

Oral presentation

Metal nano-particle formation by femtosecond laser filamentation

Nakashima, Nobuaki*; Yamanaka, Kenichi*; Yatsuhashi, Tomoyuki*; Taniguchi, Seiji*; Saeki, Morihisa; Oba, Hironori

no journal, ,

no abstracts in English

Oral presentation

Fundamental study on solidification of radioactive phosphorus acid waste liquid by magnesium phosphate cement

Yamanaka, Taiki*; Arai, Tsuyoshi*; Sato, Fuminori; Horiguchi, Kenichi

no journal, ,

no abstracts in English

Oral presentation

Study on the optimization of the solidification of low-level radioactive liquid waste by magnesium phosphate cement

Yamanaka, Taiki*; Arai, Tsuyoshi*; Sato, Fuminori; Ito, Yoshiyuki; Horiguchi, Kenichi

no journal, ,

no abstracts in English

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Rabi-oscillation spectroscopy of the hyperfine structure of muonium atoms

First nuclear transmutation of $^{237}$ Np and $^{241}$ Am by accelerator-driven system at Kyoto University Critical Assembly

New precise measurements of muonium hyperfine structure at J-PARC MUSE

XAFS measurement of simulated waste glass samples prepared from borosilicate glass frit including phosphorus pentaoxide (Joint research)

XAFS measurement of simulated waste borosilicate glass samples (Joint research)

Re-evaluation of the phase relationship between plutonium and zirconium dioxides

Development of advanced vitrification melter, 17; Accumulation behavior and particulate forms of noble metals in vitrified waste

Development of advanced vitrification melter; Accumulation behavior and particulate forms of noble metals in vitrified waste

Metal nano-particle formation by femtosecond laser filamentation

Fundamental study on solidification of radioactive phosphorus acid waste liquid by magnesium phosphate cement

Study on the optimization of the solidification of low-level radioactive liquid waste by magnesium phosphate cement