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Journal Articles

Numerical interpretation of hydrogen thermal desorption spectra for iron with hydrogen-enhanced strain-induced vacancies

Ebihara, Kenichi; Sugiyama, Yuri*; Matsumoto, Ryosuke*; Takai, Kenichi*; Suzudo, Tomoaki

Metallurgical and Materials Transactions A, 52(1), p.257 - 269, 2021/01

 Times Cited Count:0 Percentile:100(Materials Science, Multidisciplinary)

We simulated the thermal desorption spectra of a small-size iron specimen to which was applied during charging with hydrogen atoms using a model incorporating the behavior of vacancies and vacancy clusters. The model considered up to vacancy clusters $$V_9$$, which is composed of nine vacancies and employed the parameters based on atomistic calculations, including the H trapping energy of vacancies and vacancy clusters that we estimated using the molecular static calculation. As a result, we revealed that the model could, on the whole, reproduced the experimental spectra except two characteristic differences, and also the dependence of the spectra on the aging temperature. By examining the cause of the differences, the possibilities that the diffusion of clusters of $$V_2$$ and $$V_3$$ is slower than the model and that vacancy clusters are generated by applying strain and H charging concurrently were indicated.

Journal Articles

Strange pentaquarks with a hidden heavy quark-antiquark pair

Takeuchi, Sachiko*; Giachino, A.*; Takizawa, Makoto*; Santopinto, E.*; Oka, Makoto

Hadron Spectroscopy and Structure; Proceedings of the 18th International Conference (HADRON 2019), p.333 - 337, 2020/08

Pentaquarks with $$c bar{c}$$ or $$b bar{b}$$ heavy quarks are very much interesting. We analyze the strange pentaquark with $$c bar{c}$$ or $$b bar{b}$$ in the coupled-channel quark cluster model. We find bound, resonance and cusp like states.

Journal Articles

Time-controlled synthesis of the 3D coordination polymer U(1,2,3-Hbtc)$$_{2}$$ followed by the formation of molecular poly-oxo cluster {$rm U$_{14}$$} containing hemimellitate uranium(IV)

Dufaye, M.*; Martin, N. P.*; Duval, S.*; Volkringer, C.*; Ikeda, Atsushi; Loiseau, T.*

RSC Advances (Internet), 9(40), p.22795 - 22804, 2019/07

 Times Cited Count:4 Percentile:43.34(Chemistry, Multidisciplinary)

Two coordination compounds bearing tetravalent uranium (UIV)) were synthesized in the presence of tritopic hemimellitic acid in acetonitrile with a controlled amount of water (H$$_{2}$$O/U $${approx}$$ 8) and structurally characterized. The slow hydrolysis reaction together with the partial decomposition of the starting organic reactants into oxalate and acetate molecules induces the generation of such a large poly-oxo cluster with fourteen uranium centers. Structural comparisons with other closely related uranium-containing clusters, such as the {$rm U$_{12}$$}$ cluster based on the association of inner core [U$_{6}$$O$$_{8}$$] with three dinuclear sub-units {$rm U$_{2}$$}, were performed.

Journal Articles

Study on simulation of thermal desorption spectra for a tempered martensitic steel with vacancies induced by hydrogen and strain

Ebihara, Kenichi; Saito, Kei*; Takai, Kenichi*

"Suiso Zeika No Kihon Yoin To Tokusei Hyoka" Kenkyukai Hokokusho, p.57 - 61, 2018/09

no abstracts in English

Journal Articles

Present status of JAEA-Tokai tandem accelerator

Kabumoto, Hiroshi; Osa, Akihiko; Ishizaki, Nobuhiro; Tayama, Hidekazu; Matsuda, Makoto; Nakanoya, Takamitsu; Nakamura, Masahiko; Kutsukake, Kenichi; Otokawa, Yoshinori; Asozu, Takuhiro

Proceedings of 14th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1404 - 1408, 2017/12

The JAEA-Tokai tandem accelerator was operated over a total of 110 days, and delivered 22 different ions to the experiments in the research fields of nuclear physics, nuclear chemistry, atomic physics, solid state physics and radiation effects in material in FY2016. The damaged acceleration tubes by discharge were replaced with the spare tube at the regular maintenance period in March 2016, and the maximum accelerating voltage recovered to the 17 MV. However, an accident of vacuum breaking of all acceleration tubes was occurred in December, and accelerating voltage fell down to under 12 MV. Now, we are doing the maintenance to recover the performance of acceleration voltage. This paper describes the operational status of the accelerators and the major technical developments of our facility.

Journal Articles

Preparation of $$gamma$$-LiV$$_{2}$$O$$_{5}$$ from polyoxovanadate cluster Li$$_{7}$$[V$$_{15}$$O$$_{36}$$(CO$$_{3}$$)] as a high-performance cathode material and its reaction mechanism revealed by ${{it operando}}$ XAFS

Wang, H.*; Idobe, Jin*; Shimizu, Takeshi*; Matsumura, Daiju; Ina, Toshiaki*; Yoshikawa, Hirofumi*

Journal of Power Sources, 360, p.150 - 156, 2017/08

 Times Cited Count:8 Percentile:51.51(Chemistry, Physical)

Journal Articles

Fine dispersion of Pt$$_{4-5}$$ subnanoclusters and Pt single atoms over porous carbon supports and their structural analyses with X-ray absorption spectroscopy

Itoi, Hiroyuki*; Nishihara, Hirotomo*; Kobayashi, Shunsuke*; Ittisanronnachai, S.*; Ishii, Takafumi*; Berenguer, R.*; Ito, Masashi*; Matsumura, Daiju; Kyotani, Takashi*

Journal of Physical Chemistry C, 121(14), p.7892 - 7902, 2017/04

 Times Cited Count:21 Percentile:20.53(Chemistry, Physical)

Journal Articles

Temperature of thermal spikes in amorphous silicon nitride films produced by 1.11 MeV C$$_{60}^{3+}$$ impacts

Kitayama, Takumi*; Nakajima, Kaoru*; Suzuki, Motofumi*; Narumi, Kazumasa; Saito, Yuichi; Matsuda, Makoto; Sataka, Masao*; Tsujimoto, Masahiko*; Isoda, Shoji*; Kimura, Kenji*

Nuclear Instruments and Methods in Physics Research B, 354, p.183 - 186, 2015/07

 Times Cited Count:2 Percentile:74.98(Instruments & Instrumentation)

Journal Articles

Atomic structure and physical properties of fused porphyrin nanoclusters

Avramov, P. V.*; Kuzubov, A. A.*; Sakai, Seiji; Otomo, Manabu*; Entani, Shiro; Matsumoto, Yoshihiro*; Eleseeva, N. S.*; Pomogaev, V. A.*; Naramoto, Hiroshi*

Journal of Porphyrins and Phthalocyanines, 18(7), p.552 - 568, 2014/07

 Times Cited Count:1 Percentile:93.29(Chemistry, Multidisciplinary)

Journal Articles

Spectroscopic characterization of an ultrashort-pulse-laser-driven Ar cluster target incorporating both Boltzmann and particle-in-cell models

Sherrill, M. E.*; Abdallah, J. Jr.*; Csanak, G.*; Dodd, E. S.*; Fukuda, Yuji; Akahane, Yutaka; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki*; Yamakawa, Koichi; et al.

Physical Review E, 73(6), p.066404_1 - 066404_6, 2006/06

 Times Cited Count:29 Percentile:21.01(Physics, Fluids & Plasmas)

A model that solves simultaneously both the electron and atomic kinetics was used to generate synthetic He$$_alpha$$ X-ray spectra to characterize a high intensity ultrashort laser driven Ar cluster target experiment. In particular, level populations were obtained from a detailed collisional-radiative model where collisional rates were computed from a time varying electron distribution function obtained from the solution of the zero dimensional Boltzmann equation. In addition, aparticle-in-cell simulation was used to model the laser interaction with the cluster target and provided the initial electron energy distribution function (EEDF) for the Boltzmann solver. This study suggests that the high density plasma contribution to the time-integrated He$$_alpha$$ spectrum was in a highly non-equilibrium state in both the EEDF and the ion level populations and provides a prediction of 5.7 ps for the average cluster integrity time for this high density state.

Journal Articles

Coupled electron and atomic kinetics through the solution of the Boltzmann equation for generating time-dependent X-ray spectra

Sherrill, M. E.*; Abdallah, J. Jr.*; Csanak, G.*; Kilcrease, D. P.*; Dodd, E. S.*; Fukuda, Yuji; Akahane, Yutaka; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki; et al.

Journal of Quantitative Spectroscopy & Radiative Transfer, 99(1-3), p.584 - 594, 2006/05

 Times Cited Count:2 Percentile:85.97(Optics)

In this work, we present a model that solves self-consistently the electron and atomic kinetics to characterize highly non-equilibrium plasmas, in particular for those systems where both the electron distribution function is far from Maxwellian and the evolution of the ion level populations are dominated by time dependent atomic kinetics. In this model, level populations are obtained from a detailed collisional-radiative model where collision rates are computed from a time varying electron distribution function obtained from the solution of the zero-dimensional Boltzmann equation. The Boltzmann collision term includes the effects of electron-electron collisions, electron collisional ionization, excitation and de-excitation. An application for He$$_alpha$$ spectra from a short pulse laser irradiated argon cluster target will be shown to illustrate the results of our model.

Journal Articles

Structure analysis of carbon cluster ion using coulomb explosion

Chiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa

JAEA-Review 2005-001, TIARA Annual Report 2004, p.343 - 345, 2006/01

no abstracts in English

Journal Articles

MeV cluster ions from TIARA 3MV tandem accelerator

Saito, Yuichi; Chiba, Atsuya; Narumi, Kazumasa

Dai-18-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.47 - 49, 2005/11

no abstracts in English

Journal Articles

A Report on TIARA Research Review Meeting

Arakawa, Kazuo

Hoshasen Kagaku, (80), p.57 - 59, 2005/09

no abstracts in English

Journal Articles

Size of small Si and Ge clusters on Si(111) and Ge(111) surfaces

Asaoka, Hidehito; Cherepanov, V.*; Voigtl$"a$nder, B.*

Surface Science, 588(1-3), p.19 - 25, 2005/08

 Times Cited Count:24 Percentile:30.56(Chemistry, Physical)

We determined the average size of small Si and Ge clusters con$$cdot$$ned to one half of a (7$$times$$7) or (5$$times$$5) unit cell of a Si or Ge(111) surface. The size of Si and Ge clusters con$$cdot$$ned to a Si(111)-(7$$times$$7) half unit cell was determined to be 8.3$$pm$$1 atoms and 7.5$$pm$$1 atoms, respectively for a growth temperature of 400 K. This is the same value within the error and shows, that the material of the clusters is less important for the cluster size. On the Ge surface it was found that the reconstruction unit cell is important for the cluster size. On the (5$$times$$5) reconstructed Ge(111) surface the Si clusters have a smaller size of 4.7$$pm$$1 atoms compared to 8.2$$pm$$1 atoms for Si clusters on the Ge(111)-(7$$times$$7) surface.

Journal Articles

Radiation defects in heavy ion-irradiated nickel at low temperature by X-ray diffuse scattering

Maeta, Hiroshi*; Matsumoto, Norimasa; Kato, Teruo; Sugai, Hiroyuki; Otsuka, Hideo*; Sataka, Masao

Nuclear Instruments and Methods in Physics Research B, 232(1-4), p.312 - 316, 2005/05

 Times Cited Count:1 Percentile:84.82(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Measurement of $$2l-nl$$' X-ray transitions from $$approx$$1 $$mu$$m Kr clusters irradiated by high-intensity femtosecond laser pulses

Hansen, S. B.*; Fournier, K. B.*; Faenov, A. Y.*; Magunov, A. I.*; Pikuz, T. A.*; Skobelev, I. Y.*; Fukuda, Yuji; Akahane, Yutaka; Aoyama, Makoto; Inoue, Norihiro*; et al.

Physical Review E, 71(1), p.016408_1 - 016408_9, 2005/01

 Times Cited Count:15 Percentile:41(Physics, Fluids & Plasmas)

X-ray line emission from $$2l-nl$$' transitions in Ne-like Kr and nearby ions has been observed from $$approx$$ 1 $$mu$$m Kr clusters irradiated by fs-scale laser pulses at the JAERI facility in Kyoto, Japan. The dependence of X-ray spectral features and intensity on the incident laser intensity is rather weak, indicating that the 1-2 ps cluster lifetimes limit the number of ions beyond Ne-like Kr that can be produced by collisional ionization. A collisional-radiative model based on the relativistic multiconfigured FAC code has been constructed and used to determine that the cluster plasma has electron densities near 10$$^{22}$$ cm$$^{-3}$$, temperature of a few hundred eV and hot electron fraction of a few percent.

Journal Articles

Continuum-discretized coupled-channels method for four-body nuclear breakup in $$^6$$He + $$^{12}$$C scattering

Matsumoto, Takuma*; Hiyama, Emiko*; Ogata, Kazuyuki*; Iseri, Yasunori*; Kamimura, Masayasu*; Chiba, Satoshi; Yahiro, Masanobu*

Physical Review C, 70(6), p.061601_1 - 061601_5, 2004/12

 Times Cited Count:139 Percentile:1.71(Physics, Nuclear)

no abstracts in English

Journal Articles

Relativistic laser plasma from micron-sized argon clusters as a debris-free X-ray source for pulse X-ray diffraction

Fukuda, Yuji; Akahane, Yutaka; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki; Nakai, Yoshiki*; Tsuji, Koichi*; Yamakawa, Koichi; Hironaka, Yoichiro*; Kishimura, Hiroaki*; et al.

Applied Physics Letters, 85(21), p.5099 - 5101, 2004/11

 Times Cited Count:10 Percentile:57.89(Physics, Applied)

We have demonstrated diffraction from Si(111) crystal using X-rays from highly ionized Ar ions produced by laser irradiation with an intensity of 6$$times$$10$$^{18}$$ W/cm$$^{2}$$ and a pulse duration of 30 fs acting upon micron-sized Ar clusters. The measured total photon flux and line width in the He$$_{alpha1}$$ line (3.14 keV) were 4$$times$$10$$^{7}$$ photons/shot/4$$pi$$sr and 3.7 eV (FWHM), respectively, which is sufficient to utilize as a debris-free light source for time-resolved X-ray diffraction studies.

Journal Articles

Picosecond view of microscopic-scale polarization clusters in paraelectric BaTiO$$_{3}$$

Tai, R.; Namikawa, Kazumichi; Sawada, Akikatsu*; Kishimoto, Maki; Tanaka, Momoko; Lu, P.*; Nagashima, Keisuke; Maruyama, Hiroshi*; Ando, Masami*

Physical Review Letters, 93(8), p.087601_1 - 087601_4, 2004/08


 Times Cited Count:71 Percentile:10.17(Physics, Multidisciplinary)

The polarization clusters existing in both the ferroelectric and the paraelectric phase of BaTiO$$_{3}$$ are directly observed and characterized for the first time by a picosecond soft X-ray laser speckle technique. These dynamic clusters appear continuously across the Curie temperature Tc. The clusters' distance increases approximately linearly with temperature, while their mean size does not change significantly. The polarization exhibits a maximum at a temperature about 5 degree above Tc. The clusters' short-range correlation strength diverges as (T-Tc)$^-$0.41$$pm$$0.02 as temperature decreases toward Tc.

107 (Records 1-20 displayed on this page)