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Journal Articles

New measurement system based on small-angle neutron scattering for structural analysis of light-responsive materials

Iwase, Hiroki*; Akamatsu, Masaaki*; Inamura, Yasuhiro; Sakaguchi, Yoshifumi*; Morikawa, Toshiaki*; Kasai, Satoshi*; Ouchi, Keiichi*; Kobayashi, Kazuki*; Sakai, Hideki*

Journal of Applied Crystallography, 56(1), p.110 - 115, 2023/02

With the increasing importance of light-responsive materials, it is vital to analyze the relationship between function and structural changes induced by light irradiation. Small-angle scattering (SAS) is effective for such structural analysis. However, quantitatively capturing local molecular structure formation and molecular reactions at a scale of less than 1 nm via SAS is difficult. In this study, to analyze the structure of non-equilibrium phenomena in light-responsive materials, a new sample environment has been developed for a time-of-flight small- and wide-angle neutron scattering instrument (TAIKAN), comprising a UV-Vis irradiation system, UV-Vis absorption measurement equipment and photodetector. Simultaneous measurement of small-angle neutron scattering and UV-Vis absorption was achieved. This system was used to demonstrate the in situ observation of UV-Vis irradiation-induced structural change of micelles formed by a light-responsive surfactant sample in an aqueous solution.

Journal Articles

Comparison of solid-water partitions of radiocesium in river waters in Fukushima and Chernobyl Areas

Takahashi, Yoshio*; Fan, Q.*; Suga, Hiroki*; Tanaka, Kazuya; Sakaguchi, Aya*; Takeichi, Yasuo*; Ono, Kanta*; Mase, Kazuhiko*; Kato, Kenji*; Kanivets, V. V.*

Scientific Reports (Internet), 7(1), p.12407_1 - 12407_11, 2017/09

 Times Cited Count:26 Percentile:67.48(Multidisciplinary Sciences)

We focused on factors controlling partition of radiocesium on particulate matters and sediments in rivers of Fukushima and Chernobyl. Radiocesium is more soluble in the Pripyat River (Chernobyl) due to weaker interaction of radiocesium with clay minerals caused by the inhibition effect of the adsorbed humic substances. In contrast, particulate matters and sediments in the Kuchibuto River (Fukushima) display high adsorption affinity with lesser inhibition effect of adsorbed humic substances. This difference is possibly governed by the geology and soil type of provenances surrounding both catchments.

Journal Articles

Observation of a pressure-induced As-As hybridization associated with a change in the electronic state of Fe in the tetragonal phase of EuFe$$_2$$As$$_2$$

Kobayashi, Hisao*; Ikeda, Shugo*; Sakaguchi, Yui*; Yoda, Yoshitaka*; Nakamura, Hiroki; Machida, Masahiko

Journal of Physics; Condensed Matter, 25(2), p.022201_1 - 022201_6, 2013/01

 Times Cited Count:9 Percentile:40.49(Physics, Condensed Matter)

The electronic and vibrational properties of EuFe$$_2$$As$$_2$$ in the tetragonal phase between 0 and 5 GPa have been investigated using $$^{57}$$Fe M$"o$ssbauer spectroscopy and $$^{57}$$Fe nuclear resonance inelastic scattering, respectively. We find a discontinuous increase of the center shift around 2.3 GPa, reflecting a change of the electronic state of Fe, and above 2.5 GPa a softening of the optical phonon modes associated with an increase of the relative volume of the FeAs$$_4$$ tetrahedron in the unit cell. Our findings reveal that an effective As-As hybridization along the c axis appears at approximately 2.3 GPa in the tetragonal phase of EuFe$$_2$$As$$_2$$, along with a change in the electronic state of Fe, causing bulk superconductivity to appear at a low temperature. Consequently, the change in the electronic state of the Fe atom and the effective As-As hybridization play key roles in the pressure-induced superconductivity in the tetragonal phase of AFe$$_2$$As$$_2$$.

Journal Articles

de Haas-van Alphen effect and Fermi surface properties in V$$_{5}$$Si$$_{3}$$

Tsutsumi, Hiroki*; Sakaguchi, Junya*; Miura, Yasunao*; Matsuda, Tatsuma; Haga, Yoshinori; Takeuchi, Tetsuya*; Harima, Hisatomo*; Settai, Rikio*; Onuki, Yoshichika

Journal of the Physical Society of Japan, 81(Suppl.B), p.SB027_1 - SB027_4, 2012/12

 Times Cited Count:0 Percentile:0(Physics, Multidisciplinary)

Journal Articles

Visualization of electric field in ion conductive oxides using neutron computed tomography

Hayashi, Mitsuhiko*; Takai, Shigeomi*; Sakaguchi, Hiroki*; Matsubayashi, Masahito; Esaka, Takao*

Kashika Joho Gakkai-Shi, 20(suppl.1), p.375 - 376, 2000/07

no abstracts in English

Journal Articles

Analysis of hydrogen content and distribution in hydrogen storage alloys using neutron radiography

Sakaguchi, Hiroki*; Hatakeyama, Keisuke*; Satake, Yuichi*; Fujine, Shigenori*; Yoneda, Kenji*; Kanda, Keiji*; Matsubayashi, Masahito; Esaka, Takao*

Kashika Joho Gakkai-Shi, 20(suppl.1), p.373 - 374, 2000/07

no abstracts in English

Oral presentation

Present status of radiography research activities in JAEA

Matsubayashi, Masahito; Iikura, Hiroshi; Yasuda, Ryo; Kureta, Masatoshi; Takenaka, Nobuyuki*; Asano, Hitoshi*; Sakaguchi, Hiroki*; Mochiki, Koichi*; Umekawa, Hisashi*; Ozawa, Mamoru*

no journal, , 

no abstracts in English

Oral presentation

Isomer spectroscopy using actinide targets

Sugiyama, Koichi*; Go, Shintaro*; Tomimatsu, Taro*; Kai, Tamito*; Nagae, Daisuke*; Ishibashi, Yuichi*; Matsunaga, Sotaro*; Nagata, Yuto*; Nishibata, Hiroki*; Washiyama, Kohei*; et al.

no journal, , 

We have successfully performed in-beam gamma-ray spectroscopy using the isomer-scope technique to study excited-state structure of neutron-rich heavy-actinide nuclei. The neutron-rich heavy-actinide nuclei were produced in the multinucleon-transfer reactions with a $$^{248}$$Cm target and $$^{18}$$O projectiles accelerated with the JAEA tandem accelerator. Projectile-like scattered particles were detected with Si E-$$Delta$$E telescopes placed at the backward angle, and target-like scattered particles of isomers were caught by an annular aluminum plate placed at about 60-mm downstream from the target. Four Ge detectors and 4 LaBr detectors were placed at the periphery of the aluminum plate, and detected gamma rays from the isomers. Gamma rays emitted from the actinide isomers were successfully observed with a good sensitivity owing to the tungsten shield placed between the target and the detectors.

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