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Journal Articles

Charge transfer cross sections of slow multiply charged neon ions in collisions with noble gas atoms

Kusakabe, Toshio*; Shirai, Toshizo*

Plasma and Fusion Research (Internet), 9(Sp.2), p.3401119_1 - 3401119_4, 2014/07

We have measured the single- and multiple-charge transfer cross sections of Ne$$^{q+}$$ ions (q = 2 $$sim$$ 6) in collisions with Ne, Ar, Kr and Xe atoms at 2 kV in acceleration voltage. The multiply charged neon ions were extracted from a compact electron beam ion source called micro-EBIS using a strong ring permanent magnet. The cross sections of charge transfer were determined based on an initial growth rate method. In the Ne$$^{5+}$$ + Ar, Kr and Xe, and Ne$$^{6+}$$ + Ne, Ar and Xe collisions, five fold-charge transfer cross sections were derived. In the Ne atoms, the double-charge transfer of Ne$$^{2+}$$ ions, triple-charge transfer ofNe$$^{3+}$$ ions, and four fold-charge transfer of Ne$$^{4+}$$ ions are the so-called symmetric resonant charge transfer processes. The present data in these collisions are found to be in good accordance with the previous data of Kaneko et al.

Journal Articles

Charge-transfer cross sections of slow doubly and triply charged carbon ions from CO and CO$$_{2}$$ molecules

Kusakabe, Toshio*; Shiota, Kenji*; Shirai, Toshizo*

Plasma and Fusion Research (Internet), 8(Sp.1), p.2401145_1 - 2401145_4, 2013/11

no abstracts in English

Journal Articles

Building an application-specific grid computing environment using ITBL for nuclear material engineering

Tsujita, Yuichi*; Arima, Tatsumi*; Idemitsu, Kazuya*; Suzuki, Yoshio; Kimura, Hideo

Proceedings of 16th International Conference on Nuclear Engineering (ICONE-16) (CD-ROM), 9 Pages, 2008/05

Journal Articles

Temporal and spatial distribution of plutonium released from Nagasaki atomic bomb

Kokubu, Yoko

Hosha Kagaku Nyusu, (17), p.49 - 50, 2008/03

no abstracts in English

Journal Articles

Building a computing environment for nuclear material engineering using ITBL

Tsujita, Yuichi*; Arima, Tatsumi*; Idemitsu, Kazuya*; Suzuki, Yoshio; Kimura, Hideo

Joho Shori Gakkai Kenkyu Hokoku 2008-ARC-177, 2008-HPC-114, p.103 - 108, 2008/03

Recently, many research works for Pu-recycle have been done. We proposed a molecular dynamics method to have deep understandings in nuclear materials. We adopted a parallel computing technique by using an ITBL's computing environment in our simulation program because a huge amount of computations and time steps is required. We received a request from application users to incorporate a user friendly interface in a computing environment for specifying parameters in a simulation program and successive operations of parallel computation and visualization on a user's terminal. So, we have built a GUI computing environment to realize such the functionalities by using an ITBL's client API. In this paper, we report objectives of this development, implementation method of this application, and examples of the computing environment. Finally, we mention its future plan.

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:13 Percentile:66.09(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

Development of a computer simulation environment for nuclear material engineering using ITBL

Tsujita, Yuichi*; Arima, Tatsumi*; Idemitsu, Kazuya*; Nakajima, Norihiro; Suzuki, Yoshio; Kimura, Hideo

Kinki Daigaku Kogakubu Kenkyu Hokoku, (41), p.87 - 92, 2007/12

no abstracts in English

Journal Articles

Geographical distribution of plutonium derived from the atomic bomb in the eastern area of Nagasaki

Kokubu, Yoko; Yasuda, Kenichiro; Magara, Masaaki; Miyamoto, Yutaka; Sakurai, Satoshi; Usuda, Shigekazu; Yamazaki, Hideo*; Yoshikawa, Shusaku*

Journal of Radioanalytical and Nuclear Chemistry, 273(1), p.183 - 186, 2007/07

 Times Cited Count:5 Percentile:57.04(Chemistry, Analytical)

no abstracts in English

Journal Articles

Distribution of plutonium isotopes and $$^{137}$$Cs found in the surface soils of Nagasaki, Japan

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

Journal of Geosciences, Osaka City University, 50, p.7 - 13, 2007/03

no abstracts in English

Journal Articles

Geological distribution of plutonium isotopes of Nagasaki atomic bomb spread over Nagasaki and Kumamoto area

Kokubu, Yoko; Yasuda, Kenichiro; Magara, Masaaki; Miyamoto, Yutaka; Sakurai, Satoshi; Usuda, Shigekazu; Yamazaki, Hideo*; Yoshikawa, Shusaku*

KEK Proceedings 2006-5, p.36 - 40, 2006/11

no abstracts in English

Journal Articles

Cross sections of charge transfer by slow doubly-charged carbon ions from various carbon containing molecules

Kusakabe, Toshio*; Shiota, Kenji*; Kubo, Hirotaka; Shirai, Toshizo*

Journal of Plasma and Fusion Research SERIES, Vol.7, p.237 - 239, 2006/00

no abstracts in English

JAEA Reports

Investigation on the concentration distributions of natural radioactive nuclides and dose assessments on the life circumstances II

Koga, Taeko*; Morishima, Hiroshige*

JNC-TJ1400 2004-001, 0 Pages, 2005/02

JNC-TJ1400-2004-001.pdf:4.6MB

In the surroundings of the daily life, the effective internal doses due to the inhalation of radon, thoron and their decay nuclides account on average of the all world for about one-half of all natural sources of radiation. Radon and thoron, which are natural gaseous radioactive nuclides released out of rocks and soil etc. can spontaneously decay to other metal atoms, of which Po-214, Po-210 and Tl-208 are mainly the sources of exposure. We have carried out continuously the measurement of radon, thoron and their decay nuclides, and it's important of the study on the environmental movement and distribution of natural radioactive nuclides.The assessments of exposed dose by the natural radiation sources of the surrounding inhabitants and their outlooks should be understanded. In addition, we have canied out the measurements of the environmental dose rates on Japan for several years. We have selected and observed on Misasa spa district, Tottori pref., Kawanishi-shi, Hyogo pref., and Tamagawa spa district, Akita pref., and Higashi-Osaka-shi, Osaka pref., for CA, and reported these results on following ; (1) We continued time course variation of mean radon concentrations on same private house of Misasa spa district. Kawanishi-shi district and Higashi-Osaka-shi district. It tends that mean radon concentrations in air at their districts for 10 years were fluctuated low level on summer and rain season, and high on winter. (2) We have measured the radon concentrations in air with a set of indoor and outdoor on Misasa district. Radon concentrations in air on geologically formed granite layers were higher than those basaltic layers. It showed a similar tendency to the radon concentrations, although there were the low environmental dose rate levels at Misasa districts.

Journal Articles

Evidence of complete fusion in the sub-barrier $$^{16}$$O+$$^{238}$$U reaction

Nishio, Katsuhisa; Ikezoe, Hiroshi; Nagame, Yuichiro; Asai, Masato; Tsukada, Kazuaki; Mitsuoka, Shinichi; Tsuruta, Kaoru; Sato, Kenichiro; Lin, C. J.; Osawa, Takaaki*

Physical Review Letters, 93(16), p.162701_1 - 162701_4, 2004/10

 Times Cited Count:66 Percentile:10.12(Physics, Multidisciplinary)

The fission fragment angular distributions for reactions using actinide targets such as $$^{16}$$O+$$^{238}$$U show anomalously large anisotropy than the prediction of the transition state model. To interprete this phenomenon, the orientation dependent quasi-fission model was proposed. As the $$^{238}$$U has prolate deformation, the interaction of $$^{16}$$O with the $$^{238}$$U in the sub-barrier region is restricted to the tip collisions. Hinde et al. interpreted that the anomalously large angular anisotropy is due to the quasi-fission, that is the complete fusion is not achieved in the sub-barrier region. The presence (or absence) of the complete fision is found by measuring the evaporation residue cross sections. We measured the evaporation residue cross sections for $$^{16}$$O+$$^{238}$$U by using the $$^{16}$$O beams supplied by the JAERI-tandem accelerator. As a result, complete fusion was observed in the sub-barrier region and no significant fusion hindrace was observed.

JAEA Reports

None

Koga, Taeko*; Morishima, Hiroshige*

JNC-TJ1420 2003-002, 64 Pages, 2004/01

JNC-TJ1420-2003-002.pdf:9.33MB

no abstracts in English

Journal Articles

Total cross sections for charge transfer by multiply charged neon and argon ions colliding with various hydrocarbons at keV energies

Kusakabe, Toshio*; Miyamoto, Yoshiharu*; Ishida, Rikiya*; Ito, Kojiro*; Kuroyanagi, Nobuhiro*; Nakai, Yota*; Shirai, Toshizo

Nuclear Instruments and Methods in Physics Research B, 205, p.600 - 604, 2003/05

 Times Cited Count:5 Percentile:57.8

no abstracts in English

JAEA Reports

None

*; *

JNC-TJ1420 2002-010, 104 Pages, 2003/02

JNC-TJ1420-2002-010.pdf:4.15MB

no abstracts in English

JAEA Reports

Investigation on the movements and the distributions of radon, thoron and their decay nuclides on the life circumstances, II

Morishima, Hiroshige*; Koga, Taeko*

JNC-TJ1420 2002-001, 80 Pages, 2002/03

JNC-TJ1420-2002-001.pdf:11.76MB

no abstracts in English

Journal Articles

Fluorescence quenching studies of Eu-humic complexes by three-dimensional excitation emission matrix spectroscopy

Nagao, Seiya; Aoyama, Masakazu*; Watanabe, Akira*; Nakaguchi, Yuzuru*; Ogawa, Hiromichi

Analytical Sciences (CD-ROM), 17(Suppl.), p.1585 - 1588, 2002/03

no abstracts in English

JAEA Reports

None

*; *

JNC-TJ1400 2001-003, 93 Pages, 2001/03

JNC-TJ1400-2001-003.pdf:5.15MB

None

Journal Articles

Exisitence forms of Am(III) in the presence of humic substances in saline groundwater at pH 7-10

Nagao, Seiya; Nakaguchi, Yuzuru*; Suzuki, Yasuhiro*; Hiraki, Keizo*; Fujitake, Nobuhide*; Ogawa, Hiromichi

Proceedings of International Conference on the Biogeochemistry of Trace Elements (ICOBTE2001), P. 666, 2001/00

no abstracts in English

42 (Records 1-20 displayed on this page)