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RIBF Research Division

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Accelerator Applications Research Group

Subnuclear System Research Division

Directly under the Nishina Center

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Astro-Glaciology Research Group

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Group Director
  • 1998年博士(理学)(東京大学)受位
  • 1995年理化学研究所 基礎科学特別研究員
  • 2006年同 仁科加速器研究センター 仁科センター研究員
  • 2011年同 望月雪氷宇宙科学研究ユニット 研究ユニットリーダー
  • 2011年同 雪氷宇宙科学研究開発室 室長


Staff Photo

Research Areas

Ice cores preserve atmospheric information of the past. We measure isotopic and ionic concentrations in Antarctic ice cores and develop precise analytical techniques and instrumentation of high-sensitivity and high-temporal resolution. We also simulate numerically the chemical effects of giant solar flares and supernovae on the Earth’s atmosphere. Combining our experimental evidence and theoretical simulations, we are investigating climate change and its direct relationships with solar activity and volcanic eruptions, the footprints of supernovae in ice cores, and the frequency of occurrence of supernovae in the Milky Way. Furthermore, we study the evolution of molecules in space. These all will contribute to understanding relationships between the Universe and Earth.


List of Selected Publications

  1. Takeshi Minami, Kousuke Hatanaka, Yuko Motizuki, Yoichi Nakai, and Kazuya Takahashi:
    “A method of collecting trace amounts of vermilion from artifacts for source estimation by sulfur isotope (δ34S) analysis: use of sulfur-free adhesive”
    Journal of Archaeological Science: Reports 28, 102027, 2019.
  2. F. Miyake, K. Horiuchi, Y. Motizuki, Y. Nakai, K. Takahashi, K. Masuda, H. Motoyama, H. Matsuzaki:
    10Be signature of the cosmic ray event in the 10th century CE in both hemispheres, as confirmed by quasi-annual 10Be data from the Antarctic Dome Fuji ice core"
    Geophysical Research Letters 46, 11-18, 2019.
  3. Kazuya Takahashi, Yoichi Nakai, Yuko Motizuki, Toshiyuki Ino, Shigeru Ito, Satoru B. Ohkubo, Takeshi Minami, Yuichi Takaku, Yoshitaka Yamaguchi, Miho Tanaka, and Hideaki Motoyama:
    “High-sensitivity sulfur isotopic measurements for Antarctic ice core analyses”
    Rapid Communications in Mass Spectrometry 32, 1991-1998, 2018.
  4. Y. Nakai, Y. Motizuki, M. Maruyama, Y. Hasebe, H. Akiyoshi, T. Imamura:
    “Box-model simulation for influence of solar proton events on the middle atmosphere”
    RIKEN Accel. Prog. Rep. 50, 143, 2017.
  5. Y. Motizuki, H. Motoyama, Y. Nakai, K. Suzuki, Y. Iizuka and K. Takahashi:
    “Overview of the chemical composition and characteristics of Na+ and Cl– distributions in shallow samples from Antarctic ice core DF01 (Dome Fuji) drilled in 2001”
    Geochemical J. 51, 293-298, 2017.
  6. Shuji Fujita, Kumiko Goto-Azuma, Motohiro Hirabayashi, Akira Hori, Yoshinori Iizuka, Yuko Motizuki, Hideaki Motoyama, Kazuya Takahashi:
    “Densification of layered firn of the ice sheet at Dome Fuji, Antarctica”
    Journal of Glaciology 62, 231, 103-123, 2016.
  7. Fusa Miyake, Asami Suzuki, Kimiaki Masuda, Kazuho Horiuchi, Hideaki Motoyama, Hiroyuki Matsuzaki, Yuko Motizuki, Kazuya Takahashi, Yoichi Nakai:
    “Cosmic ray event of AD 774-775 shown in quasi-annual 10Be data from the Antarctic Dome Fuji ice core”
    Geophysical Research Letters 42, 84-89, 2015.
  8. M. Sigl, J. McConnell, M. Toohey, M. Curran, S. Das, R. Edwards, E. Isaksson, K. Kawamura, S. Kipfstuhl, K. Krüger, L. Layman, O. Maselli, Y. Motizuki, H. Motoyama, D. Pasteris, M. Severi:
    “Insights from Antarctica on volcanic forcing during the Common Era”
    Nature Climate Change 4, 693–697, 2014.
  9. Y. Motizuki, Y. Nakai, K. Takahashi, M. Igarashi, H. Motoyama, K. Suzuki:
    “Dating of a Dome Fuji (Antarctica) shallow ice core by volcanic signal synchronization with B32 and EDML1 chronologies”
    The Cryosphere Discussions 8, 769-804, 2014.
  10. R. N. Boyd, M. A. Famiano, B. S. Meyer, Y. Motizuki, T. Kajino, and I. U. Roederer:
    “The r-process in metal-poor stars and black hole formation”
    The Astrophysical Journal Letters 744, L14-L17, 2012.