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Yamashita, Keishiro*; Komatsu, Kazuki*; Klotz, S.*; Fabelo, O.*; Fern
ndez-D
az, M. T.*; Abe, Jun*; Machida, Shinichi*; Hattori, Takanori; Irifune, Tetsuo*; Shimmei, Toru*; et al.
Proceedings of the National Academy of Sciences of the United States of America, 119(40), p.e2208717119_1 - e2208717119_6, 2022/10
Times Cited Count：2 Percentile：20.4(Multidisciplinary Sciences)Here we present the first elucidation of the disordered structure of ice VII, the dominant high-pressure form of water, at 2.2 GPa and 298 K from both single-crystal and powder neutron diffraction techniques. We reveal the three-dimensional atomic distributions from the maximum entropy method and unexpectedly find a ring-like distribution of hydrogen in contrast to the commonly-accepted discrete sites. In addition, total scattering analysis at 274 K clarified the difference in the intermolecular structure from ice VIII, the ordered counterpart of ice VII, despite an identical molecular geometry. Our complementary structure analyses robustly demonstrate the unique disordered structure of ice VII. Furthermore, these noble findings are related to the proton dynamics which drastically vary with pressure, and will contribute to an understanding of the structural origin of anomalous physical properties of ice VII under pressures.
Kosako, Toshiso*; Tani, Kotaro*; Ogino, Haruyuki*; Iida, Takao*; Hattori, Takatoshi*; Oda, Keiji*; Omi, Tadashi*; Furuta, Sadaaki*; Murakami, Hironori*; Kasai, Atsushi*; et al.
no journal, ,
Two proposal notes were written by the Japan Health Physics Society in terms of the issues on radiation protection considering the arguments in many academic symposiums after the accident in TEPCO Fukushima-Daiichi NPP resulting from the Great East Japan Earthquake of March 11, 2011. These proposal notes were referred in some symposiums, and the follow-up activities are needed for collecting the chronological information after the Fukushima accident and for considering these proposal matter in detail. After the proposal notes were published, quite many activities for radiation protection were performed. In this professional workshop, the chronological information was collected and easily evaluated concerning with the proposal. In this presentation, the outcome was introduced.
Ishitobi, Takayuki; Hattori, Kazumasa*
no journal, ,
no abstracts in English
Ishitobi, Takayuki; Hattori, Kazumasa*
no journal, ,
no abstracts in English
