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Nakagawa, Hiroshi; Inoue, Rintaro*; Oda, Takashi*; Yagi, Maho*; Saio, Tomohide*; Oroguchi, Tomotaka*; Nagata, Yuya*; Sugiyama, Masaaki*; Sato, Mamoru*; Kawakita, Yukinobu; et al.
no journal, ,
Proteins have hierarchical structures and hierarchical dynamics. The importance of analyzing the structural dynamics of proteins in solution has been increasing in recent years, and neutron scattering is expected to be an experimental method to study the hierarchical structures on the nanometer order and the dynamics on the pico- to nanosecond time scales, which are relevant to biological functions. In this study, we used the quasi-elastic neutron scattering and small-angle neutron scattering instruments installed at MLF to elucidate the dynamics of these structures in space and time. We aim to establish a new generation of neutron structural biology that will lead protein science in Japan.
Oikawa, Kenichi; Sato, Hirotaka*; Watanabe, Kenichi*; Su, Y. H.; Shinohara, Takenao; Kai, Tetsuya; Kiyanagi, Yoshiaki*; Kamiyama, Takashi*
no journal, ,
no abstracts in English
Tsuchikawa, Yusuke; Kai, Tetsuya; Abe, Yuta; Oishi, Yuji*; Sun, Y.*; Oikawa, Kenichi; Nakatani, Takeshi; Sato, Ikken; Joseph, P.*; Matsumoto, Yoshihiro*
no journal, ,
In the decommissioning of the Fukushima Daiichi Nuclear Power Plant (NPP), the quantitative analysis of residual boron and borides in the reactor core and the identification of boron compound states are one of the important issues to be investigated. In this presentation, we report on the neutron energy-resolved analysis of boron samples irradiated with neutrons at J-PARC/MLF. We also investigated the possibility of identifying the compounds using peak broadening of the prompt gamma rays for each boride. The prompt gamma-ray peak-widths of metallic and non-metallic borides were significantly different from each other, while those of zirconium boride and iron boride were slightly different. The differences between these metal borides were measured and evaluated in detail by gamma-ray energy spectrum analysis. Finally, we will briefly introduce the current experiments and analysis results of our efforts toward two- and three-dimensional quantitative measurements using energy-analyzed two-dimensional detectors.
Tamura, Itaru; Kodama, Katsuaki; Igawa, Naoki; Abe, Kazuhide; Matsue, Hideaki
no journal, ,
no abstracts in English
Kimoto, Yuko*; Sato, Isamu*; Matsuura, Haruaki*; Suzuki, Eriko; Miwa, Shuhei
no journal, ,
In order to clarify the penetration behavior of Sr into concrete, the penetration test of SrCl
and Sr(OH) solution were carried out and the coordination structure of Sr in concrete was analyzed using EXAFS and XRF. It was revealed that the penetrated Sr from SrCl solution have a coordination structure of Sr-O, which O is derived from concrete. This result suggests that the coordination behavior of Sr with O can affect the penetration behavior of Sr into concrete.
Okamoto, Yoshihiro; Tanida, Hajime; Nagai, Takayuki
no journal, ,
We performed simulations using the molecular dynamics (MD) method of nuclear waste glass samples and attempted to use them as an assistance in the analysis and interpretation of the obtained XAFS experimental data. In the MD calculation of borosilicate glass used as a frit material for the waste glass, a model that reproduces the experimental values well has already been established. In this study, the interaction model of component elements (for example, Zn) contained in the glass was verified using XAFS data. Since XAFS data are sensitive to local structure and chemical state, they are suitable information for evaluating the interaction model of MD calculation. The EXAFS function was calculated using the XAFS simulation code FEFF using atomic configuration data obtained from the MD calculation. When the EXAFS spectrum of Zn in glass was calculated, the experimental results were well reproduced. In addition, calculations were performed by changing the Si/B ratio and the amount of Na contained in the glass, and the local structural changes around Zn were compared with the experimental XAFS analysis results.
Watanabe, Masao; Nojiri, Hiroyuki*
no journal, ,
In recent years, there has been increasing requirements for experiments under a high magnetic field of several tens of Tesla using neutrons and synchrotron radiation. Superconducting DC magnet up to 17 Tesla has developed for neutron scattering experiments. Although the sample environment team in the MLF have several DC superconducting magnets up to 7 Tesla as a sample environment apparatus, users have requested the preparation of higher field magnets. Therefore, we have been newly developed a compact and transportable pulsed magnet system up to 30 Tesla.
Nakatani, Takeshi; Inamura, Yasuhiro; Moriyama, Kentaro*
no journal, ,
no abstracts in English
Harada, Masahide; Kawakami, Kazuhiro*; Oku, Takayuki; Aizawa, Kazuya; Ishikado, Motoyuki*; Hashimoto, Norimichi*; Hosoya, Tomonori*; Ichimura, Katsuhiro*
no journal, ,
no abstracts in English
Harada, Masahide; Abe, Yutaka*; Oikawa, Kenichi; Kawasaki, Takuro; Kawamura, Seiko; Nakajima, Kenji; Inamura, Yasuhiro; Takahashi, Ryuta*; Teshigawara, Makoto; Oi, Motoki; et al.
no journal, ,
no abstracts in English
Masuda, Shiho; Kai, Tetsuya; Uehara, Toshiaki; Harada, Masahide; Kinoshita, Hidetaka; Sakai, Kenji; Haga, Katsuhiro
no journal, ,
no abstracts in English
Komine, Ryota; Kambara, Wataru*; Nakatani, Takeshi
no journal, ,
In neutron experiences at J-PARC MLF, neutron beams from the neutron source provide neutrons which have wide energy and which also contains unnecessary energy neutrons in the neutron experiences. These unnecessary neutrons are observed as background noises. Especially T0 burst (Time Zero Burst) which is neutron beams' components right after emitted from the neutron source affects neutron experiments, therefore the T0 burst must be removed before arriving at samples. T0 chopper is one of the devices to remove the T0 burst. High-durability T0 choppers is developed to extend maintenance periods in MLF in recent years and the high-durability T0 choppers have worked for multiple beamlines since 2019. A device control software framework: IROHA2 is used in MLF. IROHA2 enables us to collect device data automatically, operate devices remotely, control multiple devices comprehensively and so on when experimental devices connect to IROHA2. In this year, we designed and wrote communication programs to connect high-durability T0 chopper to IROHA2 and installed the programs in the T0 chopper and IROHA2 respectively. By installing these programs, we expect that the programs enable us to operate the T0 choppers stably and deal with some trouble flexibly. An outline about the control system for high-durability T0 choppers will be presented.
Suzuki, Hiroshi; Mukai, Tomohisa*; Kanematsu, Manabu*
no journal, ,
no abstracts in English