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Journal Articles

PANDORA Project for the study of photonuclear reactions below $$A=60$$

Tamii, Atsushi*; Pellegri, L.*; S$"o$derstr$"o$m, P.-A.*; Allard, D.*; Goriely, S.*; Inakura, Tsunenori*; Khan, E.*; Kido, Eiji*; Kimura, Masaaki*; Litvinova, E.*; et al.

European Physical Journal A, 59(9), p.208_1 - 208_21, 2023/09

no abstracts in English

Journal Articles

Summary results of subsidy program for the "Project of Decommissioning and Contaminated Water Management (Development of Analysis and Estimation Technology for Characterization of Fuel Debris (Development of Technologies for Enhanced Analysis Accuracy and Thermal Behavior Estimation of Fuel Debris))"

Koyama, Shinichi; Nakagiri, Toshio; Osaka, Masahiko; Yoshida, Hiroyuki; Kurata, Masaki; Ikeuchi, Hirotomo; Maeda, Koji; Sasaki, Shinji; Onishi, Takashi; Takano, Masahide; et al.

Hairo, Osensui Taisaku jigyo jimukyoku Homu Peji (Internet), 144 Pages, 2021/08

JAEA performed the subsidy program for the "Project of Decommissioning and Contaminated Water Management (Development of Analysis and Estimation Technology for Characterization of Fuel Debris (Development of Technologies for Enhanced Analysis Accuracy and Thermal Behavior Estimation of Fuel Debris))" in 2020JFY. This presentation summarized briefly the results of the project, which will be available shortly on the website of Management Office for the Project of Decommissioning and Contaminated Water Management.

Journal Articles

Formation of $$alpha$$ clusters in dilute neutron-rich matter

Tanaka, Junki*; Yang, Z.*; Typel, S.*; Adachi, Satoshi*; Bai, S.*; van Beek, P.*; Beaumel, D.*; Fujikawa, Yuki*; Han, J.*; Heil, S.*; et al.

Science, 371(6526), p.260 - 264, 2021/01

 Times Cited Count:30 Percentile:99.14(Multidisciplinary Sciences)

By employing quasi-free $$alpha$$-cluster-knockout reactions, we obtained direct experimental evidence for the formation of $$alpha$$ clusters at the surface of neutron-rich tin isotopes. The observed monotonous decrease of the reaction cross sections with increasing mass number, in excellent agreement with the theoretical prediction, implies a tight interplay between $$alpha$$-cluster formation and the neutron skin.

Journal Articles

Formation and mobility of soil organic carbon in a buried humic horizon of a volcanic ash soil

Wijesinghe, J. N.*; Koarashi, Jun; Atarashi-Andoh, Mariko; Kokubu, Yoko; Yamaguchi, Noriko*; Sase, Takashi*; Hosono, Mamoru*; Inoue, Yuzuru*; Mori, Yuki*; Hiradate, Shuntaro*

Geoderma, 374, p.114417_1 - 114417_10, 2020/09

 Times Cited Count:8 Percentile:53.03(Soil Science)

Journal Articles

Energy-resolved small-angle neutron scattering from steel

Oba, Yojiro*; Morooka, Satoshi; Oishi, Kazuki*; Suzuki, Junichi*; Takata, Shinichi; Sato, Nobuhiro*; Inoue, Rintaro*; Tsuchiyama, Toshihiro*; Gilbert, E. P.*; Sugiyama, Masaaki*

Journal of Applied Crystallography, 50(2), p.334 - 339, 2017/04

 Times Cited Count:3 Percentile:29.42(Chemistry, Multidisciplinary)

Journal Articles

Magnetic scattering in the simultaneous measurement of small-angle neutron scattering and Bragg edge transmission from steel

Oba, Yojiro*; Morooka, Satoshi; Oishi, Kazuki*; Sato, Nobuhiro*; Inoue, Rintaro*; Adachi, Nozomu*; Suzuki, Junichi*; Tsuchiyama, Toshihiro*; Gilbert, E. P.*; Sugiyama, Masaaki*

Journal of Applied Crystallography, 49(5), p.1659 - 1664, 2016/10

 Times Cited Count:12 Percentile:67.1(Chemistry, Multidisciplinary)

Journal Articles

Characterization of the microstructure of dual-phase 9Cr-ODS steels using a laser-assisted 3D atom probe

Nogiwa, Kimihiro; Nishimura, Akihiko; Yokoyama, Atsushi; Otsuka, Satoshi; Kaito, Takeji; Inoue, Masaki; Okubo, Tadakatsu*; Hono, Kazuhiro*

Journal of Nuclear Materials, 417(1-3), p.201 - 204, 2011/10

 Times Cited Count:8 Percentile:53.54(Materials Science, Multidisciplinary)

Du se 9Cr-ODS (oxide dispersion-strengthened) steel consisting of residual-$$alpha$$ ferrite and $$alpha$$ prime martensite has excellent high-temperature strength. This study describes the microstructure of dual-phase 9Cr-ODS steels characterized by atom-probe tomography in order to compare oxide-particle dispersion states in each phase. This revealed that nano-size oxide particles were of the same chemical composition and that their mean size was about 3 nm in each phase. On the other hand, the number density in the residual-$$alpha$$ phase was about four times higher than that of the $$alpha$$ prime phase. These results indicate that the dense distribution of the oxide particles in the residual-$$alpha$$ phase contribute to the excellent high-temperature strength of 9Cr-ODS steel.

Journal Articles

A New method for the quantitative analysis of the scale and composition of nanosized oxide in 9Cr-ODS steel

Onuma, Masato*; Suzuki, Junichi; Otsuka, Satoshi; Kim, S.-W.; Kaito, Takeji; Inoue, Masaki; Kitazawa, Hideaki*

Acta Materialia, 57(18), p.5571 - 5581, 2009/10

 Times Cited Count:115 Percentile:97.19(Materials Science, Multidisciplinary)

Journal Articles

Effect of nano-size oxide particle dispersion and $$Delta$$-ferrite proportion on creep strength of 9Cr-ODS steel

Otsuka, Satoshi; Kaito, Takeji; Kim, S.-W.; Inoue, Masaki; Asayama, Tai; Onuma, Masato*; Suzuki, Junichi

Materials Transactions, 50(7), p.1778 - 1784, 2009/06

 Times Cited Count:11 Percentile:53.5(Materials Science, Multidisciplinary)

Journal Articles

Flexible fuel cycle R&D for the smooth FBR deployment

Fukasawa, Tetsuo*; Yamashita, Junichi*; Hoshino, Kuniyoshi*; Sasahira, Akira*; Inoue, Tadashi*; Minato, Kazuo; Sato, Seichi*

Proceedings of 16th Pacific Basin Nuclear Conference (PBNC-16) (CD-ROM), 6 Pages, 2008/10

Transition period from light water reactors (LWR) to fast breeder reactors (FBR) is quite important to achieve the future FBR cycle system. The transition scenarios were carefully studied and the Flexible Fuel Cycle Initiative (FFCI) was proposed in this study. FFCI carries out about 90% uranium (U) removal from LWR spent fuels (SF) at first and then recovers plutonium/uranium (Pu/U) from the remaining SF named "recycle material"(RM) (about 40% U, 15% Pu and 45% other nuclides) for FBR fresh fuel fabrication according to the FBR deployment status. The FFCI has some merits compared with ordinary system that carries out full reprocessing of LWR SF, that is volume reduction of LWR SF by its conversion to RM (proliferation resistant material), and storage and supply of high Pu density RM according to FBR deployment rate changes.

Journal Articles

Uranium recovery in LWR reprocessing and plutonium/residual uranium conditioning in FBR reprocessing for the transition from LWR to FBR

Fukasawa, Tetsuo*; Yamashita, Junichi*; Hoshino, Kuniyoshi*; Sasahira, Akira*; Inoue, Tadashi*; Minato, Kazuo; Sato, Seichi*

Proceedings of 3rd International ATALANTE Conference (ATALANTE 2008) (CD-ROM), 7 Pages, 2008/05

In order to flexibly manage the transition period from LWR to FBR, the authors investigated the transition scenario and proposed the Flexible Fuel Cycle Initiative (FFCI). In FFCI, LWR spent fuel reprocessing only carries out the removal of about 90% uranium that will be purified and utilized in LWR after re-enrichment. The residual material (40% U, 15% Pu and 45% other nuclides) is transferred to temporary storage and/or FBR spent fuel reprocessing to recover Pu/U followed by FBR fresh fuel fabrication depending on the FBR introduction status. The FFCI has some merits compared with ordinary system that consists of full reprocessing facilities for both LWR and FBR spent fuels, that is smaller LWR reprocessing facility, spent LWR fuel reduction, storage and supply of high proliferation resistant and high Pu density material that can flexibly respond to FBR introduction rate changes. The Pu balance was calculated under several cases, which revealed that the FFCI could supply enough Pu to FBR in any cases.

Journal Articles

Tobacco BY-2 cells have a transient and leaky DNA-damage checkpoint at G$$_{2}$$/M phase after $$gamma$$-ray irradiation

Yokota, Yuichiro; Funayama, Tomoo; Wada, Seiichi*; Hase, Yoshihiro; Kobayashi, Yasuhiko; Inoue, Masayoshi*; Tanaka, Atsushi; Narumi, Issei

JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 69, 2008/03

no abstracts in English

Journal Articles

Depositional records of plutonium and $$^{137}$$Cs released from Nagasaki atomic bomb in sediment of Nishiyama reservoir at Nagasaki

Kokubu, Yoko; Yasuda, Kenichiro; Magara, Masaaki; Miyamoto, Yutaka; Sakurai, Satoshi; Usuda, Shigekazu; Yamazaki, Hideo*; Yoshikawa, Shusaku*; Nagaoka, Shinji*; Mitamura, Muneki*; et al.

Journal of Environmental Radioactivity, 99(1), p.211 - 217, 2008/01

 Times Cited Count:18 Percentile:40.59(Environmental Sciences)

In a sediment core of Nishiyama reservoir at Nagasaki, depth profiles of $$^{240}$$Pu/$$^{239}$$Pu ratio, $$^{239+240}$$Pu and $$^{137}$$Cs concentrations were determined. Sediments containing plutonium and $$^{137}$$Cs, which were fallout deposited immediately after a detonation of Nagasaki atomic bomb, were identified in the core. Observed below the sediments were macroscopic charcoals, providing evidence for initial deposit of the fallout. This is the first entire depositional records of plutonium and $$^{137}$$Cs released from the Nagasaki atomic bomb together with those from atmospheric nuclear tests.

Journal Articles

A Review on radiation tolerance mechanism of higher plants

Yokota, Yuichiro; Inoue, Masayoshi; Narumi, Issei; Funayama, Tomoo; Kobayashi, Yasuhiko; Tanaka, Atsushi

Hoshasen Seibutsu Kenkyu, 42(4), p.402 - 415, 2007/12

It has been known that many types of higher plants are several hundred times more radio-tolerant than mammals at an individual level. There was, however, no available information on the detail mechanism of radiation tolerance of higher plants. Thus, we have done the radiobiological studies using tobacco BY-2 cell line as a model plant cell. In their studies, we made clear that tobacco cells are ten times more radio-tolerant than mammalian cells, and that radioresistant tobacco cells can tolerate a large number of DNA double-strand breaks compared with mammalian cells. In this review, we discussed the radiation tolerant mechanism of higher plants by taking together the past findings with our latest data: tobacco cells are tolerant of radiation-induced chromosomal aberration although DNA double-strand break repair abilities of tobacco and mammalian cells are almost the same.

Journal Articles

Quantitative analysis of DNA double-strand breaks in tobacco protoplasts irradiated with helium, carbon and neon ion beam

Yokota, Yuichiro; Yamada, Shinya*; Hase, Yoshihiro; Shikazono, Naoya; Narumi, Issei; Tanaka, Atsushi; Inoue, Masayoshi

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 77, 2007/02

no abstracts in English

Journal Articles

Initial yields of DNA double-strand breaks and DNA fragmentation patterns depend on linear energy transfer in tobacco BY-2 protoplasts irradiated with helium, carbon and neon ions

Yokota, Yuichiro; Yamada, Shinya*; Hase, Yoshihiro; Shikazono, Naoya; Narumi, Issei; Tanaka, Atsushi; Inoue, Masayoshi*

Radiation Research, 167(1), p.94 - 101, 2007/01

 Times Cited Count:26 Percentile:61.34(Biology)

The ability of ion beams to kill or mutate plant cells is known to depend on the linear energy transfer (LET) of the ions, although the mechanism is poorly understood. In this study, tobacco BY-2 protoplasts as a model of single plant cells were irradiated with helium, carbon and neon ions having different LETs. Following irradiation, DNA fragments were separated into sizes by pulsed-field gel electrophoresis. Information on DNA fragmentation was obtained by staining the gels with SYBR Green I. Initial DSB yields (Gbp$$^{-1}$$ Gy$$^{-1}$$) were found to depend on LET, and the highest relative biological effectiveness (about 1.6) was obtained at 124 and 241 keV/$$mu$$m carbon ions. High-LET carbon and neon ions yielded short DNA fragments more efficiently than $$gamma$$ rays. These results partially explain the large biological effects caused by high-LET ions in plants.

Journal Articles

Sensor noise caused by vibrations of flaw detection probe generated in helical heating tubes in a fast breeder reactor and its countermeasures, 2; Numerical simulations of probe vibration

Inoue, Takumi*; Sueoka, Atsuo*; Maehara, Takeshi*; Nakano, Hiroshi*; Kanemoto, Hiroyuki*; Murakami, Yukitaka*

Nihon Kikai Gakkai Rombunshu, C, 72(714), p.380 - 387, 2006/02

None

Journal Articles

Selective transition to the closely-lying states Cs(7$$D$$$$_{3/2}$$) and Cs(7$$D$$$$_{5/2}$$) by femtosecond laser pulses

Yamada, Hidetaka; Yokoyama, Keiichi; Teranishi, Yoshiaki*; Sugita, Akihiro; Shirai, Toshizo*; Aoyama, Makoto; Akahane, Yutaka; Inoue, Norihiro*; Ueda, Hideki*; Yamakawa, Koichi; et al.

Physical Review A, 72(6), p.063404_1 - 063404_5, 2005/12

 Times Cited Count:6 Percentile:31.26(Optics)

A demonstration of coherent quantum control for ultrafast precise selection of closely-lying states is reported. A phase-locked pair of femtosecond laser pulses is generated through a pulse shaper to excite the ground-state cesium atom to the Cs(7$$D$$$$_{3/2}$$) and Cs(7$$D$$$$_{5/2}$$) states by two-photon absorption. The excited state population is measured by detecting fluorescence from each spin-orbit state. By controlling the phase-difference of the pulse pair, an ultrafast precise selection is accomplished. The contrast ratio of the maximal to minimal selection ratio exceeds 10$$^3$$ with the delay less than 400 fs.

Journal Articles

Genomic relationships among $$Nicotiana$$ species with different ploidy levels revealed by 5S rDNA spacer sequences and FISH/GISH

Kitamura, Satoshi; Tanaka, Atsushi; Inoue, Masayoshi*

Genes and Genetic Systems, 80(4), p.251 - 260, 2005/08

 Times Cited Count:10 Percentile:20.13(Biochemistry & Molecular Biology)

We used the intergenic spacer sequences of the 5S ribosomal RNA genes (5S rDNA) to obtain insights into the genomic origin of putative amphidiploid/tetraploid species with 2n=48 and their descendants in Nicotiana. Comparison of the spacer sequences with those from diploid (2n=24) Nicotiana species made it possible to detect some groups consisting of the sequences from the 2n=24 and 2n=48 level species. Chromosomal localizations of the 5S rDNA arrays were similar in most groups. The relationships suggested by the 5S rDNA were also assessed at the genome level by using genomic in situ hybridization. We showed that the grouping based on the 5S rDNA spacer sequence reflects high genomic homology between 2n=24 and 2n=48 level species. Our results are generally in agreement with the relationships previously suggested by morphological and cytogenetic observations, and some novel relationships were also revealed.

Journal Articles

Comparative radiation tolerance based on the induction of DNA double-strand breaks in Tobacco BY-2 cells and CHO-K1 cells irradiated with $$gamma$$ rays

Yokota, Yuichiro; Shikazono, Naoya; Tanaka, Atsushi; Hase, Yoshihiro; Funayama, Tomoo; Wada, Seiichi; Inoue, Masayoshi*

Radiation Research, 163(5), p.520 - 525, 2005/05

 Times Cited Count:19 Percentile:48.92(Biology)

Higher plants are generally more tolerant to ionizing radiation than mammals. To explore the radiation tolerance of higher plants, the amount of DNA double-strand breaks (DSBs) induced by $$gamma$$-rays was investigated in tobacco BY-2 cells and compared with that investigated in Chinese hamster ovary (CHO)-K1 cells as a reference. The resulting DNA fragments were separated by pulsed-field gel electrophoresis and stained with SYBR Green I. Initial DSB yield was then quantified from the fraction of DNA fragments shorter than 1.6 Mbp based on the assumption of random distribution of DSBs. The DSB yield in tobacco BY-2 cells (2.0 $$pm$$ 0.1 DSBs Gbp$$^{-1}$$ Gy$$^{-1}$$) was only one-third of that in CHO-K1 cells. Furthermore, the calculated number of DSBs per diploid cell irradiated with $$gamma$$-rays of mean lethal dose was five times greater in tobacco BY-2 cells (263.2 $$pm$$ 13.2) than in CHO-K1 cells. These results suggest that the radiation tolerance of tobacco BY-2 cells appears to be due to not only a lower induction of DNA damage but also a more efficient repair of the induced DNA damage.

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