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Journal Articles

Approach to the low temperature state oriented for crystalline beam

Noda, Akira*; Nakao, Masao*; Soda, Hikaru*; Tongu, Hiromu*; Jimbo, Koichi*; Okamoto, Hiromi*; Osaki, Kazuya*; Yuri, Yosuke; Meshkov, I.*; Smirnov, A.*; et al.

Proceedings of 23rd Russian Particle Accelerator Conference (RuPAC 2012) (Internet), p.48 - 52, 2012/09

http://accelconf.web.cern.ch/AccelConf/rupac2012/papers/tuxch03.pdf

Journal Articles

Role of cerium oxide in the enhancement of activity for the oxygen reduction reaction at Pt-CeO$$_{x}$$ nanocomposite electrocatalyst; An in situ electrochemical X-ray absorption fine structure study

Masuda, Takuya*; Fukumitsu, Hitoshi*; Fugane, Keisuke*; Togasaki, Hirotaka*; Matsumura, Daiju; Tamura, Kazuhisa; Nishihata, Yasuo; Yoshikawa, Hideki*; Kobayashi, Keisuke*; Mori, Toshiyuki*; et al.

Journal of Physical Chemistry C, 116(18), p.10098 - 10102, 2012/05

https://doi.org/10.1021/jp301509t
 Times Cited Count：127 Percentile：93.64(Chemistry, Physical)

In situ electrochemical X-ray absorption fine structure (XAFS) measurements were performed at the Pt L$$_{3}$$ and Ce L$$_{3}$$ edges of the Pt-CeO$$_{x}$$/C catalyst, which was prepared by a combined process of precipitation and coimpregnation methods, as well as at the Pt L$$_{3}$$ edge of the conventional Pt/C catalyst in oxygen-saturated H$$_{2}$$SO$$_{4}$$ solution to clarify the role of CeO$$_{x}$$ in the reduction of the overpotential for the oxygen reduction reaction (ORR) at the Pt-CeO$$_{x}$$ nanocomposite compared with the conventional Pt/C catalyst. XAFS measurements clearly show that the enhancement of ORR activity is attributed to the inhibition of Pt oxide formation by the CeO$$_{x}$$ layer, of which Ce$$^{3+}$$ was oxidized to Ce$$^{4+}$$ instead of Pt at the Pt oxide formation potential.

Journal Articles

Actinide-handling experience for training and education of future expert under J-ACTINET

Osaka, Masahiko; Konashi, Kenji*; Hayashi, Hirokazu; Li, D.*; Homma, Yoshiya*; Yamamura, Tomoo*; Sato, Isamu; Miwa, Shuhei; Sekimoto, Shun*; Kubota, Takumi*; et al.

Proceedings of International Conference on Toward and Over the Fukushima Daiichi Accident (GLOBAL 2011) (CD-ROM), 5 Pages, 2011/12

Summer schools for future experts have successfully been completed under Japan Actinide Network (J-ACTINET) for the purpose of development of human resources who are expected to be engaged in every areas of actinide-research/engineering. The first summer school was held in Ibaraki-area in August 2009, followed by the second one in Kansai-area in August 2010. Two summer schools have focused on actual experiences of actinides in actinide-research fields for university students and young researchers/engineers as an introductory course of actinide-researches. Several quasi actinide-handling experiences at the actinide-research fields have attracted attentions of participants at the first school in Ibaraki-area. The actual experiments using actinides-containing solutions have been carried out at the second school in Kansai-area. Future summer schools will be held every year for the sustainable human resource development in various actinide-research fields.

Journal Articles

Study of neutron capture reactions using the 4$$pi$$ Ge spectrometer

Harada, Hideo; Goko, Shinji*; Kimura, Atsushi; Ota, Masayuki*; Oshima, Masumi; Kitatani, Fumito; Toh, Yosuke; Furutaka, Kazuyoshi; Kin, Tadahiro; Koizumi, Mitsuo; et al.

Journal of the Korean Physical Society, 59(2), p.1547 - 1552, 2011/08

https://doi.org/10.3938/jkps.59.1547
 Times Cited Count：9 Percentile：52.57(Physics, Multidisciplinary)

For the improvement of the accuracy on the neutron capture cross sections, a 4$$pi$$ Ge spectrometer was developed. The 4$$pi$$ Ge spectrometer is a unique tool due to its superior energy resolution for studying properties on neutron capture reactions, not only capture cross sections but also resonance identification, $$gamma$$-ray intensity distribution, and spin-parity assignment. For example, its performance on the resonance identification was demonstrated using a $$^{rm nat}$$Ag sample. On the measurement of a $$gamma$$-ray intensity distribution for each resonance, the results of $$^{238}$$U will be shown. Using the 4$$pi$$ Ge spectrometer, the measurements of neutron capture cross sections were started at the J-PARC/MLF/ANNRI. The preliminary results on the measurements of neutron capture cross sections will be discussed mainly based on measurements of neutron capture cross sections for $$^{241}$$Am, together with related techniques.

JAEA Reports

Study on neutron capture cross sections of long-lived fission products

Igashira, Masayuki*; Osaki, Toshiro*; Nagai, Yasuki*; Yamana, Hajimu*; Fujii, Toshiyuki*; Takamiya, Koichi*; Harada, Hideo; Furutaka, Kazuyoshi; Nakamura, Shoji

JNC TY8400 2005-009, 186 Pages, 2005/09

JNC-TY8400-2005-009.pdf:14.33MB

Accurate fast-neutron capture cross sections of long-lived fission products (LLFPs) are indispensable for the R&D of nuclear transmutation systems which utilize the fast-neutron capture reaction. The accuracy of those cross section data contained nuclear data libraries are, however, quite inadequate. Therefore, accurate experimental data on those cross sections are necessary as the basic data usefule for the evaluation of capture cross sections of LLFPs. The final goal of the present study is to obtain the results with the errors from 5 to 10% fore the fast-neutron capture cross sections of $$^{99}$$Tc and tentative results with the errors of about 10% for those of $$^{93}$$Zr, using the electron linear accelerator based neutron source at the Oak Ridege National Laboratory. For this goal, the four research items were executed: (1) the separation, purification and analysis of LLFP samples, (2) the improvement of weighting function of $$gamma$$-ray detector, (3) the measurement of fast-neutron capture cross sections of impurity isotopes in LLFP samples, and (4) the measurement of fast-neutron capture cross sections of $$^{99}$$Tc and $$^{93}$$Zr. The final goal was not reached due to the long-term trouble of the electron linear accelerator, but sufficient results were obtained for the other items. In particular, the present results for the capture cross sections and capture $$gamma$$-ray spectra of $$^{90,91,92,94}$$Zr wer important nuclear data for the R&D of nuclear transmutation systems.

Journal Articles

Measurements of neutron-capture cross sections of radioactive nuclides through high-energy $$gamma$$-ray spectroscopic studies

Furutaka, Kazuyoshi; Harada, Hideo; Nakamura, Shoji; Sakane, Hitoshi; Yamana, Hajimu*; Fujii, Toshiyuki*; Yamamoto, Shuji*; Hori, Junichi*; Igashira, Masayuki*; Osaki, Toshiro*; et al.

KURRI Progress Report 2004, P. 16, 2005/09

This report describes the studies done through spectroscopic method of high-energy $$gamma$$ ray to determine neutron capture cross sections of radioactive nuclides, in FY2004 at the Research Reactor Institute, Kyoto University. The following three items are described. (1) Development of a method to determine thermal neutron capture cross sections by prompt $$gamma$$-ray measurements, (2) Evaluation of a large BGO detector system as a total-energy detector, and (3) neutron capture cross-section measurements by TOF method.

Journal Articles

A Modified version of the analytical potential function for the global ab initio ground-state potential energy surface of the BrH$$_{2}$$ system

Kurosaki, Yuzuru; Takayanagi, Toshiyuki*

Chemical Physics Letters, 406(1-3), p.121 - 125, 2005/04

https://doi.org/10.1016/j.cplett.2005.02.106

no abstracts in English

Journal Articles

Global ${it ab initio}$ potential energy surfaces for the lowest three doublet states (1$$^{2}$$A', 2$$^{2}$$A', and 1$$^{2}$$A") of the BrH$$_{2}$$ system

Kurosaki, Yuzuru; Takayanagi, Toshiyuki

Journal of Chemical Physics, 119(15), p.7838 - 7856, 2003/10

https://doi.org/10.1063/1.1609398
 Times Cited Count：26 Percentile：62.93(Chemistry, Physical)

Adiabatic potential energy surfaces of the lowest three doublet states (1$$^{2}$$A', 2$$^{2}$$A', and 1$$^{2}$$A") for the BrH$$_{2}$$ system have been calculated globally using the MRCI+Q method with the aug-cc-pVTZ basis set. Spin-orbit effects were considered on the basis of Breit-Pauli Hamiltonian. The calculated adiabatic energies were fitted to the analytical functional form of many-body expansion. The barrier heights of the abstraction and exchange reactions on the ground-state PES were calculated to be 1.28 and 11.71 kcal mol$$^{-1}$$, respectively, at the MRCI+Q/aug-cc-pVTZ level of theory. The fits for the three PESs were successful within the accuracy of 0.1 kcal mol$$^{-1}$$. Thermal rate constants for the abstraction and exchange reactions and their isotopic variants were calculated with the fitted 1$$^{2}$$A' PES using the ICVT/LAG method. The calculated rate constants for the abstarction reactions agree fairly well with experiment but those for the exchange reactions were much smaller than experiment, which suggests that the reliable experimental data are still insufficient.

Journal Articles

Ab initio molecular orbital study of the O($$^{1}$$D) insertion into the C-C bond in cyclopropane and ethane

Kurosaki, Yuzuru; Takayanagi, Toshiyuki

Chemical Physics Letters, 355(5-6), p.424 - 430, 2002/04

https://doi.org/10.1016/S0009-2614(02)00262-2
 Times Cited Count：3 Percentile：8.50(Chemistry, Physical)

no abstracts in English

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：38.45(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Quantum scattering calculations for the electronically nonadiabatic Br($$^{2}$$P$$_{1/2}$$)+H$$_{2}$$ $$rightarrow$$ HBr+H reaction

Takayanagi, Toshiyuki; Kurosaki, Yuzuru

Journal of Chemical Physics, 113(17), p.7158 - 7164, 2000/11

https://doi.org/10.1063/1.1312284
 Times Cited Count：43 Percentile：77.08(Chemistry, Physical)

no abstracts in English

Journal Articles

Production processes of H(D) atoms in the reactions of NO(A$$^{2}Sigma^{+}$$) with C$$_{2}$$H$$_{2}$$, C$$_{2}$$H$$_{4}$$, H$$_{2}$$O and their isotopic variants

Umemoto, Hironobu*; Terada, Naoki*; Tanaka, Kunikazu*; Takayanagi, Toshiyuki; Kurosaki, Yuzuru; Yokoyama, Keiichi

Chemical Physics, 259(1), p.39 - 47, 2000/09

https://doi.org/10.1016/S0301-0104(00)00184-1
 Times Cited Count：9 Percentile：26.95(Chemistry, Physical)

no abstracts in English

Journal Articles

Ab initio calculations for the N($$^{2}$$D)+CH$$_{4}$$ reaction; Does the N($$^{2}$$D) atom really insert into CH bonds of alkane molecules?

Takayanagi, Toshiyuki; Kurosaki, Yuzuru; Yokoyama, Keiichi

International Journal of Quantum Chemistry, 79(3), p.190 - 197, 2000/09

https://doi.org/10.1002/1097-461X(2000)79:3<190::AID-QUA4>3.0.CO;2-0
 Times Cited Count：11 Percentile：49.22(Chemistry, Physical)

no abstracts in English

Journal Articles

Theoretical study of kinetic isotope effects on rate constans for the H$$_{2}$$+C$$_{2}$$H$$rightarrow$$H+C$$_{2}$$H$$_{2}$$ reaction and its isotopic variants

Kurosaki, Yuzuru; Takayanagi, Toshiyuki

Journal of Chemical Physics, 113(10), p.4060 - 4072, 2000/09

https://doi.org/10.1063/1.1288173
 Times Cited Count：22 Percentile：55.25(Chemistry, Physical)

no abstracts in English

Journal Articles

Ab initio molecular orbital study of potential energy surface for the H$$_{2}$$NO($$^{2}$$B$$_{1}$$)$$rightarrow$$NO($$^{2}$$$$Pi$$)+H$$_{2}$$ reaction

Kurosaki, Yuzuru*; Takayanagi, Toshiyuki

Journal of Molecular Structure; THEOCHEM, 507(1-3), p.119 - 126, 2000/07

no abstracts in English

Journal Articles

Cyanomethylene formation from the reaction of excited nitrogen atoms with acetylene; A Crossed beam and ab initio study

Balucani, N.*; Algia, M.*; Cartechini, L.*; Casavecchia, P.*; Volpi, G. G.*; Sato, K.*; Takayanagi, Toshiyuki; Kurosaki, Yuzuru*

Journal of the American Chemical Society, 122(18), p.4443 - 4450, 2000/05

https://doi.org/10.1021/ja993448c
 Times Cited Count：77 Percentile：87.66(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Ab initio molecular orbital calcualtions of potential energy surfaces for the N($$^{4}$$S, $$^{2}$$D, $$^{2}$$P)+H$$_{2}$$ reactions

Takayanagi, Toshiyuki; Kurosaki, Yuzuru; Yokoyama, Keiichi

Chemical Physics Letters, 321(1-2), p.106 - 112, 2000/04

https://doi.org/10.1016/S0009-2614(00)00329-8
 Times Cited Count：24 Percentile：58.18(Chemistry, Physical)

no abstracts in English

Journal Articles

Three-dimensional quantum reactive scattering calculations for the nonadiabatic (D+H$$_{2}$$)$$^{+}$$ reaction system

Takayanagi, Toshiyuki; Kurosaki, Yuzuru; Ichihara, Akira

Journal of Chemical Physics, 112(6), p.2615 - 2622, 2000/02

https://doi.org/10.1063/1.480835
 Times Cited Count：62 Percentile：86.06(Chemistry, Physical)

no abstracts in English

Journal Articles

Theoretical calculations of the prereaction process of the H$$^{-}$$…HD van der Waals molecule

Takayanagi, Toshiyuki; Kurosaki, Yuzuru

Physical Chemistry Chemical Physics, 2(4), p.665 - 670, 2000/02

https://doi.org/10.1039/a907157a
 Times Cited Count：10 Percentile：29.91(Chemistry, Physical)

no abstracts in English

Journal Articles

Theoretical study of an isotope effect on rate constants for the CH$$_{3}$$+H$$_{2}$$$$rightarrow$$CH$$_{4}$$+H and CD$$_{3}$$+H$$_{2}$$$$rightarrow$$CD$$_{3}$$H+H reactions using variational transition state theory and the multidimensional semiclassical tunneling method

Kurosaki, Yuzuru*; Takayanagi, Toshiyuki

Journal of Chemical Physics, 110(22), p.10830 - 10842, 1999/06

https://doi.org/10.1063/1.479025
 Times Cited Count：20 Percentile：53.00(Chemistry, Physical)

no abstracts in English

50 (Records 1-20 displayed on this page)