Updated on 2025/06/09

写真a

 
OKAZAKI RYUJI
 
Organization
Faculty of Science Department of Earth and Planetary Sciences Associate Professor
School of Sciences Department of Earth and Planetary Sciences(Concurrent)
Graduate School of Sciences Department of Earth and Planetary Sciences(Concurrent)
Title
Associate Professor
Profile
Meteorites and cosmic dusts are sutdied in respects of petrological/mineralogical features and chemical/isotopical compositions. The goal of the studies is to understand the origin and evolution history of the solar system materials.
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Research Areas

  • Natural Science / Space and planetary sciences

Degree

  • Doctor of Science

Research Interests・Research Keywords

  • Research theme: Noble gases in Martian meteorites

    Keyword: Noble gas, Martian meteorite

    Research period: 2024.4 - 2030.4

  • Research theme: isotopes

    Keyword: isotopes

    Research period: 2024

  • Research theme: minerals

    Keyword: minerals

    Research period: 2024

  • Research theme: 太陽系

    Keyword: 太陽系

    Research period: 2024

  • Research theme: 宇宙化学

    Keyword: 宇宙化学

    Research period: 2024

  • Research theme: 宇宙塵

    Keyword: 宇宙塵

    Research period: 2024

  • Research theme: 小惑星

    Keyword: 小惑星

    Research period: 2024

  • Research theme: 彗星

    Keyword: 彗星

    Research period: 2024

  • Research theme: 惑星

    Keyword: 惑星

    Research period: 2024

  • Research theme: 星雲

    Keyword: 星雲

    Research period: 2024

  • Research theme: 隕石

    Keyword: 隕石

    Research period: 2024

  • Research theme: Understanding of the condition and settings of chemical reaction in the interstellar space.

    Keyword: interstellar space, organic matter, gas, ice

    Research period: 2020.11 - 2025.3

  • Research theme: Initial analysis of the Hayabusa2 return sample

    Keyword: Hayabusa2

    Research period: 2019.4 - 2022.6

  • Research theme: Recovery of the re-entry capsule of the Hayabusa2 spacecraft.

    Keyword: Hayabusa2

    Research period: 2018.4 - 2021.3

  • Research theme: Pu-Xe isochron dating for eucrties

    Keyword: eucrite, isochoron, Pu-Xe

    Research period: 2017.10 - 2019.9

  • Research theme: Pre-compaction ages for Ca-Al-rich refractory inclusions (CAIs) in chondrites

    Keyword: CAIs, pre-compaction age, solar nebula

    Research period: 2011.4 - 2014.3

  • Research theme: Development of Hayabusa-2

    Keyword: Hayabusa-2

    Research period: 2010.9 - 2014.3

  • Research theme: Noble gas analysis for an asteroid sample from Itokawa

    Keyword: Hayabusa, Itokawa, asteroid, noble gas, solar system

    Research period: 2010.8 - 2013.3

  • Research theme: Interaction between minerals, water, and organic materials in the early solar system.

    Keyword: minerals, water, organic materials, the early solar system.

    Research period: 2010.4 - 2014.3

  • Research theme: A study on the chemical fractionation in the solar nebula based on chemistry, mineralogy, and isotopic compositions of the chondrite matrix.

    Keyword: chondrite, matrix, chemical fractionation, solar nebula

    Research period: 2007.4

  • Research theme: Chemistry, mineralogy, and isotopic characteristics of crystalline Antarctic micrometeorites.

    Keyword: micrometeorites, comet, asteroids, meteorites, crystalline, noble gas, oxygen, rare earth elements

    Research period: 2006.4 - 2008.5

  • Research theme: Origin and history of the reduced material in the solar nebula

    Keyword: solar nebula, reduced material, enstatite chondrites, noble gas, oxygen, rare earth elements

    Research period: 2001.4 - 2006.12

Papers

  • Macromolecular organic matter in samples of the asteroid (162173) Ryugu Reviewed International journal

    Yabuta, Hikaru; Cody, George D.; Engrand, Cécile; Kebukawa, Yoko; De Gregorio, Bradley; Bonal, Lydie; Remusat, Laurent; Stroud, Rhonda; Quirico, Eric; Nittler, Larry; Hashiguchi, Minako; Komatsu, Mutsumi; Okumura, Taiga; Mathurin, Jérémie; Dartois, Emmanuel; Duprat, Jean; Takahashi, Yoshio; Takeichi, Yasuo; Kilcoyne, David; Yamashita, Shohei; Dazzi, Alexandre; Deniset-Besseau, Ariane; Sandford, Scott; Martins, Zita; Tamenori, Yusuke; Ohigashi, Takuji; Suga, Hiroki; Wakabayashi, Daisuke; Verdier-Paoletti, Maximilien; Mostefaoui, Smail; Montagnac, Gilles; Barosch, Jens; Kamide, Kanami; Shigenaka, Miho; Bejach, Laure; Matsumoto, Megumi; Enokido, Yuma; Noguchi, Takaaki; Yurimoto, Hisayoshi; Nakamura, Tomoki; @Okazaki, Ryuji; Naraoka, Hiroshi; Sakamoto, Kanako; Connolly, Harold C.; Lauretta, Dante S.; Abe, Masanao; Okada, Tatsuaki; Yada, Toru; Nishimura, Masahiro; Yogata, Kasumi; Nakato, Aiko; Yoshitake, Miwa; Iwamae, Ayako; Furuya, Shizuho; Hatakeda, Kentaro; Miyazaki, Akiko; Soejima, Hiromichi; Hitomi, Yuya; Kumagai, Kazuya; Usui, Tomohiro; Hayashi, Tasuku; Yamamoto, Daiki; Fukai, Ryota; Sugita, Seiji; Kitazato, Kohei; Hirata, Naru; Honda, Rie; Morota, Tomokatsu; Tatsumi, Eri; Sakatani, Naoya; Namiki, Noriyuki; Matsumoto, Koji; Noguchi, Rina; Wada, Koji; Senshu, Hiroki; Ogawa, Kazunori; Yokota, Yasuhiro; Ishihara, Yoshiaki; Shimaki, Yuri; Yamada, Manabu; Honda, Chikatoshi; Michikami, Tatsuhiro; Matsuoka, Moe; Hirata, Naoyuki; Arakawa, Masahiko; Okamoto, Chisato; Ishiguro, Masateru; Jaumann, Ralf; Bibring, Jean-Pierre; Grott, Matthias; Schröder, Stefan; Otto, Katharina; Pilorget, Cedric; Schmitz, Nicole; Biele, Jens; Ho, Tra-Mi; Moussi-Soffys, Aurélie; Miura, Akira; Noda, Hirotomo; Yamada, Tetsuya; Yoshihara, Keisuke; Kawahara, Kosuke; Ikeda, Hitoshi; Yamamoto, Yukio; Shirai, Kei; Kikuchi, Shota; Ogawa, Naoko; Takeuchi, Hiroshi; Ono, Go; Mimasu, Yuya; Yoshikawa, Kent; Takei, Yuto; Fujii, Atsushi; Iijima, Yu-ichi; Nakazawa, Satoru; Hosoda, Satoshi; Iwata, Takahiro; Hayakawa, Masahiko; Sawada, Hirotaka; Yano, Hajime; Tsukizaki, Ryudo; Ozaki, Masanobu; Terui, Fuyuto; Tanaka, Satoshi; Fujimoto, Masaki; Yoshikawa, Makoto; Saiki, Takanao; Tachibana, Shogo; Watanabe, Sei-ichiro; Tsuda, Yuichi

    Science   2023.3

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    Language:English   Publishing type:Research paper (scientific journal)  

  • Hayabusa-returned sample curation in the Planetary Material Sample Curation Facility of JAXA. Reviewed International journal

    T. Yada, A. Fujimura, M. Abe, T. Nakamura, T. Noguchi, Okazaki Ryuji, K. Nagao,, Y. Ishibashi,, K. Shirai, M. E. Zolensky, S. Sandford,, T. Okada, M. Uesugi, Y. Karouji, M. Ogawa, S. Yakame, M. Ueno, T. Mukai, M. Yoshikawa

    Meteoritics & Planetary Science   49 ( 2 )   135 - 153   2014.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1111/maps.12027

  • Space weathered rims found on the surfaces of the Itokawa dust particles. Reviewed International journal

    T. Noguchi, M. Kimura, T. Hashimoto, M. Konno, T. Nakamura, M. E. Zolensky,, M. Tanaka, Okazaki Ryuji, A. Tsuchiyama, A. Nakato, T. Ogami, H. Ishida, R. Sagae, S. Tsujimoto, T. Matsumoto, J. Matsuno, A. Fujimura, M. Abe, T. Yada

    Meteoritics & Planetary Science   49 ( 2 )   188 - 214   2013.5

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    Language:English   Publishing type:Research paper (scientific journal)  

  • Radar-Enabled Recovery of the Sutter's Mill Meteorite, a Carbonaceous Chondrite Regolith Breccia Reviewed International journal

    Jenniskens P., 他, Okazaki Ryuji, 他

    Science   338 ( 6114 )   2012.12

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    Language:English  

    DOI: 10.1126/science.1227163

  • Construction of a newly designed small-size mass spectrometer for helium isotope analysis: Toward the continuous monitoring of 3He/4He ratios in natural fluids. Reviewed International journal

    K. Bajo, H. Sumino, M. Toyoda, Okazaki Ryuji, T. Osawa, M. Ishihara, I. Katakuse, K. Notsu, G. Igarashi, K. Nagao

    Mass Spectrometry   DOI:10.5702   2012.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.5702

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Presentations

  • LL3-5コンドライト NWA 7985の宇宙線照射履歴

    #飛松優、@岡崎隆司

    日本地球化学会  2024.9 

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    Event date: 2024.9

    Language:Japanese  

    Venue:東京海洋大学   Country:Japan  

  • 越谷、 小牧 、 習志野 、 八王子 、 曽根 隕石の希ガス同位体組成

    @岡崎隆司、 米田成一、 山口亮

    日本地球化学会  2023.9 

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    Event date: 2024.9

    Language:Japanese  

    Venue:東京海洋大学   Country:Japan  

  • 40Ar/39Ar analyses on Martian meteorites, Yamato 002712, Asuka 12325 and Northwest Africa 12542 International conference

    J. Park, @R. Okazaki, A. Yamaguchi, M. Inagaki, and A. J. Irving

    55th Lunar and Planetary Science Conference  2024.3 

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    Event date: 2024.3

    Language:English  

    Venue:Houston   Country:United States  

  • Isotopic compositions of noble gases and nitrogen in the Ryugu samples returned by Hayabusa2 International conference

    R. Okazaki, B. Marty, H. Busemann, K. Hashizume, J. Gilmour, A. Meshik, T. Yada, F. Kitajima, M.W. Broadley, D. Byrne, E. Füri, M.E.I. Riebe, D. Krietsch, C. Maden, A. Ishida, P. Clay, S. Crowther, L. Fawcett, T. Lawton, O. Pravdivseva, J. Park, K. Bajo, Y. Takano, K. Yamada, S. Kawagucci, Y. Matsui, M. Yamamoto, Y.N. Miura, K. Righter, S. Sakai, N. Iwata, N. Shirai, S. Sekimoto, M. Inagaki, M. Ebihara, R. Yokochi, K. Nishiizumi, K. Nagao, J.I. Lee, A. Kano, M.W. Caffee, R. Uemura, T. Nakamura, H. Naraoka, T. Noguchi, H. Yabuta, H. Yurimoto, S. Tachibana, H. Sawada, K. Sakamoto, S. Watanabe, and Y. Tsuda

    The 53rd Lunar and Planetary Science Conference  2022.3 

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    Event date: 2022.5

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

    Introduction: In December 2014, the Hayabusa2 spacecraft launched to visit the C-type asteroid (162173) Ryugu to bring back surface and subsurface materials to the Earth. The spacecraft arrived at Ryugu on June 27, 2018, and subsequently carried out two touchdowns (TDs) and sample collections. [1]. The 1st TD was carried out and collected surface samples, while the 2nd TD was done to collect the impact ejecta near the artificial crater made by the Small Carry-on Impactor operation in April 2019 [1]. Samples collected during the 1st and 2nd TDs were stored in Chamber A and C of the Hayabusa2 sample catcher, respectively [2]. Our principal objective is to quantify the indigenous compositions of the Ryugu samples with as little terrestrial contamination as possible. Here we report the isotopic ratios and concentrations of noble gases and nitrogen in the Ryugu samples allocated to the Hayabusa2-initial-analysis-volatile team.
    Samples and Experimental method: The samples both from Chamber A (A0105- series) and from Chamber C (C0106- series) were allocated to the volatile sub-team. These samples are typically 0.8 mm-sized individual grains, not clumps of powders. Each of the samples was pressed onto diamond disks and pelletized for the Fourier-Transform Infrared (FT-IR) spectroscopy and Field-Emission Scanning Electron Microscope (FESEM) observations prior to isotope analyses. To avoid contamination from the Earth’s atmosphere, we treated the samples under a pure nitrogen environment or in vacuum during the entire procedures from the sample preparation to the isotope analyses [3]. In addition to the pelletized samples, noble gases were analyzed in some fragments generated during the pelletization process. Noble gas analyses were performed at Kyushu U., ETH, U. Manchester, and Washington U., while noble gas and nitrogen isotopes were measured at CRPG-Nancy and Ibaraki U.
    Results and Discussion: Twenty-four pelletized samples were measured for FT-IR and FESEM to characterize their petrology and mineralogy. The FESEM observation revealed that all of the Ryugu samples consist of a phyllosilicate-rich fine-grained matrix, with variable amounts of magnetite and Fe-sulfide, which are consistent with the other Ryugu samples allocated to different sub-teams [4, 5], and show similarities with CI chondrites. Reflectance spectra of our samples are also consistent with the previous reports on the Ryugu grains [e.g., 6].
    The modal abundances of magnetite and Fe-sulfide are similar to those of typical CI lithology, which indicates that our samples are not magnetite or sulfide-rich CI clasts [7], CM, or CY chondrite materials [8].
    Isotopic ratios of Ne in the Ryugu samples (Fig. 1) are similar to those in Orgueil and Ivuna [9], and can be explained by a mixing between solar wind (SW) [10], planetary-type Ne (P1 or Q gas: [11, 12]), and presolar HL Ne [12]. Based on the Ne isotopic ratios, we calculated cosmogenic 21Ne concentrations by weighted mean to be 5.0 and 4.6 ×10-9 cm3STP/g for the Ryugu-A (except for SW-rich A0105-15) and for the Ryugu-C samples, respectively. The measured 10Be concentrations [13] suggest shielding depths of 2–20 g/cm2 (relatively shallow) and one of 150 g/cm2 (deeper) for the Ryugu-A and C samples, respectively. Based on these measurements in conjunction with the production rates [14] for the CI chemistry [15], we obtained the cosmic ray exposure ages of 5.6 and 5.7 Myr for the Ryugu-A and C samples, respectively. For the SW-rich A0105-15, we assumed the shallowest shielding of 0–1 g/cm2 and obtained several hundreds of kyr using its cosmogenic 21Ne of 1.1×10-9 cm3STP/g. We concluded that most of the Ryugu materials resided at a subsurface layer of Ryugu beneath an uppermost layer of material that have been exposed to solar wind irradiation.
    Isotopic ratios of nitrogen in our samples are depleted in 15N compared to those in the other sub-teams’ Ryugu samples [16, 17] and CI chondrites [e.g., 18] (Fig. 2). The nitrogen concentrations are also lower than those in CI chondrites and the other Ryugu samples. The two samples of A0105-07 and C0106-07 plot close to the Yamato-980115 dehydrated CI chondrite [19]. The variations observed in the δ15N and the nitrogen contents can be attributed to sample heterogeneity at a small scale of samples, and suggest that there are at least two different carrier phases of nitrogen in the Ryugu samples; one is nitrogen-depleted and has a lower δ15N value, while the other is nitrogen-enriched and has a higher δ15N value. A linear trend is observed among the Ryugu samples and CI chondrites, from which we can estimate the δ15N value to be ~70 ‰ for the 15N-rich end member. The similarity with the dehydrated CI chondrite Y-980115 suggests that some dehydration or devolatilization effect may be responsible for the depletion of the 15N-rich phase from our samples, although the mineralogy of the Ryugu samples does not show heavily metamorphosed features as Y-980115 does.
    Acknowledgments: RO was supported by JSPS KAKENHI Grant Numbers JP19H01959 and JP20H05846. BM, EF, MWB and DB were supported by the European Research Council (PHOTONIS Advanced Grant # 695618 and VOLATILIS Starting Grant 715028) and by the Centre National d’Etudes Spatiales (CNES). Work by D.K., M.R. and H.B. has been carried out within the framework of the NCCR Planets and the Ambizione program supported by the Swiss NSF. JG, SC, TL and LF were funded by STFC grants numbers ST/R000751/1 and ST/V000675/1. PLC was supported by UKRI FLF grant number MR/S03465X/1. KH and AI were supported by JSPS KAKENHI Grant Number JP20H00190.
    References: [1] Tsuda Y. et al. (2020) Acta Astronautica, 171, 42–54. [2] Okazaki R. et al. (2017) Space Sci. Rev. 208, 107-124. [3] Okazaki R. et al. (2021) Hayabusa Symposium 2021, S1-7. [4] Yokoyama T. et al. (2022) submitted to Science. [5] Nakamura T. et al. (2022) submitted to Science. [6] Yada T. et al. (2021) Nature Astronomy, doi.org/10.1038/s41550-021-01550-6. [7] Alfing J. et al. (2019) Geochemistry 79, 125532. [8] King A.J. et al. (2019) Geochemistry 79, 125531. [9] Schultz L. and Franke L. (2004) Meteorit. Planet. Sci. 39, 1889–1890. [10] Heber V.S. et al. (2009) Geochim. Cosmochim. Acta 73, 7414–7432. [11] Busemann H. et al. (2000) Meteorit. Planet. Sci. 35, 949–973. [12] Ott U. (2014) Chemie der Erde 74, 519–544. [13] Nishiizumi K. et al. (2021) Hayabusa Symposium 2021, S3-1. [14] Hohenberg C.M. et al. (1978) Proc. Lunar Planet. Sci. Conf. 9th, 2311–2344. [15] Lodders K. & Fegley B. (1998) The planetary scientist's companion. New York: Oxford Univ. Press. [16] Naraoka H. et al. (2022) submitted to Science. [17] Yabuta H. et al. (2022) submitted to Science. [18] Alexander C.M.O.D. et al. (2012) Science 337, 721–723. [19] Chan Q.H.S. et al. (2016) Earth Planet. Space 68, article id. 7.

  • Initial Analysis of Volatile Components in the Hayabusa2 Samples Invited International conference

    Ryuji Okazaki, Bernard Marty, Henner Busemann, Yayoi N. Miura, Keita Yamada, Saburo Sakai, Ko Hashizume, Ken-ichi Bajo, Shun Sekimoto, Fumio Kitajima, Kevin Righter, Alex Meshik, Jamie Gilmour, Naoyoshi Iwata, Evelyn Füri, Sarah Crowther, Naoki Shirai, Mitsuru Ebihara, Yoshinori Takano, Akizumi Ishida, Reika Yokochi, Olga Pravdivseva, Jisun Park, Toru Yada, Kunihiko Nishiizumi, Keisuke Nagao, Jong Ik Lee, Michael Broadley, David Byrne, My Riebe, Patricia Clay, Akihiro Kano, Marc Caffee, Shinsuke Kawagucci, Yohei Matsui, Ryu Uemura, Makoto Inagaki, Daniela Krietsch, Colin Maden, Mizuki Yamamoto, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Hiroshi Naraoka, Hikaru Yabuta, Kanako Sakamoto, Shogo Tachibana, Sei-ichiro Watanabe and Yuichi Tsuda

    Hayabusa Symposium 2021  2021.11 

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    Event date: 2021.5 - 2022.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

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MISC

  • Author Correction: Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis (Nature Astronomy, (2022), 7, 2, (182-189), 10.1038/s41550-022-01846-1)

    Paquet M., Moynier F., Yokoyama T., Dai W., Hu Y., Abe Y., Aléon J., Conel C.M., Amari S., Amelin Y., Bajo K.i., Bizzarro M., Bouvier A., Carlson R.W., Chaussidon M., Choi B.G., Dauphas N., Davis A.M., Di Rocco T., Fujiya W., Fukai R., Gautam I., Haba M.K., Hibiya Y., Hidaka H., Homma H., Hoppe P., Huss G.R., Ichida K., Iizuka T., Ireland T.R., Ishikawa A., Ito M., Itoh S., Kawasaki N., Kita N.T., Kitajima K., Kleine T., Komatani S., Krot A.N., Liu M.C., Masuda Y., McKeegan K.D., Morita M., Motomura K., Nakai I., Nagashima K., Nesvorný D., Nguyen A.N., Nittler L., Onose M., Pack A., Park C., Piani L., Qin L., Russell S.S., Sakamoto N., Schönbächler M., Tafla L., Tang H., Terada K., Terada Y., Usui T., Wada S., Wadhwa M., Walker R.J., Yamashita K., Yin Q.Z., Yoneda S., Young E.D., Yui H., Zhang A.C., Nakamura T., Naraoka H., Noguchi T., Okazaki R., Sakamoto K., Yabuta H., Abe M., Miyazaki A., Nakato A., Nishimura M., Okada T., Yada T., Yogata K., Nakazawa S., Saiki T., Tanaka S., Terui F., Tsuda Y., Watanabe S.i., Yoshikawa M., Tachibana S., Yurimoto H.

    Nature Astronomy   7 ( 5 )   2023.5

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    Publisher:Nature Astronomy  

    DOI: 10.1038/s41550-023-01938-6

    Scopus

  • 書評:微隕石探索図鑑:あなたの身近の美しい宇宙のかけら

    岡崎隆司

    遊星人   2018.9

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    Language:Japanese   Publishing type:Book review, literature introduction, etc.  

  • 火星隕石の希ガス同位体

    岡崎隆司、長尾敬介

    月刊地球、海洋出版株式会社   2004.1

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

Professional Memberships

  • The Geochemical Society of Japan

  • 非公開

  • Meteoritics and Planetary Science

Committee Memberships

  • 日本惑星科学会   編集委員   Domestic

    2005.6 - 2025.3   

Academic Activities

  • Screening of academic papers

    Role(s): Peer review

    2023

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:2

  • Screening of academic papers

    Role(s): Peer review

    2022

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:0

  • Screening of academic papers

    Role(s): Peer review

    2021

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:1

  • Screening of academic papers

    Role(s): Peer review

    2020

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:1

  • Screening of academic papers

    Role(s): Peer review

    2019

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:3

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Research Projects

  • 始原隕石マトリックスの星雲内宇宙線照射の履歴-円盤物質の時空間分布とサイズ進化-

    Grant number:25K01059  2025.4 - 2030.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    岡崎 隆司

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    Grant type:Scientific research funding

    CiNii Research

  • 火星衛星探査計画 MMX International coauthorship

    2023.2

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid) 

  • The Chemical Environment of the Solar System during its Formation

    Grant number:20H05846  2020.11 - 2025.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Transformative Research Areas (A)

    橘 省吾, 瀧川 晶, 奈良岡 浩, 薮田 ひかる, 岡崎 隆司, 松本 恵, 圦本 尚義

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    Grant type:Scientific research funding

    地球外有機物の精密分析と再現実験により,太陽系形成時の初期化学状態を解明する.隕石,惑星間塵,「はやぶさ2」が持ち帰るC型小惑星リュウグウ試料中の有機物の総合分析をおこない,元素・同位体組成,分子構造などを決定する.これらの有機物は太陽系形成時につくられた後,原始太陽系円盤や小天体で変質し,現在の状態になっている.共存鉱物から,有機物が経験した変質過程を推定し,変質前の太陽系最初期有機物の化学状態を制約する.光化学反応有機物形成実験,および有機物やケイ酸塩の変質実験をおこない,太陽系最初期有機物ならびにその形成と変化を再現する条件を明らかにする.

    CiNii Research

  • はやぶさ2帰還試料のガス採取および試料分析に関する研究開発

    2020.4 - 2021.3

    国立研究開発法人宇宙航空研究開発機構 

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    Authorship:Coinvestigator(s) 

    太陽系科学分野において研究を推進するため,はやぶさ2帰還試料におけるガス分析および微小固体試料分析に関する研究・開発を行う.

  • Did the Formation of Jupiter Break Up the Primordial Solar Nebula? -An Approach from a Differentiated Meteorite

    Grant number:19H01959  2019.4 - 2023.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Yamaguchi Akira

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    Grant type:Scientific research funding

    We studied petrology, geochemistry, and chronology of differentiated achondrites to elucidate the evolutionary process of differentiated proto-planets. Achondrites such as basaltic and andesitic meteorites derived from the inner Solar System and the NWA 011 meteorite, known as the outer solar system origin, were analyzed. We found that these meteorites experienced similar secondary processes, such as shock metamorphism, after their formation. EC 002 is an andesitic meteorite formed by partially melting the chondritic source. Severa angrites have heterogeneity of oxygen isotopes, indicating large-scale collisions of differentiated protoplanets shortly after the formation of the Solar System.

    CiNii Research

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Educational Activities

  • 基幹教育:自然科学総合実験、宇宙科学概論
    学部1年生:地球惑星科学I/II
    学部2年生:地球惑星実験学
    学部3年生:地球惑星化学特別演習II
    学部2/3年生:地球惑星化学実験
    学部4年生:地球惑星科学特別研究
    学部4年生:地球惑星科学演習
    大学院教育:物質科学演習、初期太陽系進化学
    大学院教育:地球惑星科学特別研究
    大学院教育:地球惑星科学特別演習

Class subject

  • 基礎科学実習

    2023.12 - 2024.2   Winter quarter

  • 初期太陽系進化論

    2023.10 - 2024.3   Second semester

  • 地球惑星生物環境実験

    2023.10 - 2024.3   Second semester

  • 地球惑星化学実験

    2023.10 - 2024.3   Second semester

  • 地球惑星科学特別講義ⅩⅡ

    2023.4 - 2023.9   First semester

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FD Participation

  • 2022.3   Role:Participation   Title:地球惑星科学科FD

    Organizer:Undergraduate school department

  • 2008.12   Role:Participation   Title:必修実験について

    Organizer:Undergraduate school department

  • 2007.12   Role:Participation   Title:新しい大学院教育について

    Organizer:Undergraduate school department

  • 2006.7   Role:Participation   Title:地球惑星科学科FD 地球惑星科学科の新しいカリキュラムについて

    Organizer:Undergraduate school department

  • 2005.7   Role:Participation   Title:地球惑星科学科 低年次専攻教育科目について考える

    Organizer:Undergraduate school department

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Social Activities

  • 第168回制御技術部会大会にて講演(タイトル「小惑星探査機はやぶさ2の試料回収・封入装置の開発と帰還試料初期分析」)

    日本鉄鋼協会  2023.7

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • はやぶさ2試料分析に関して

    はまぎん こども宇宙科学館  2022.5

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • 「九州で解明するリュウグウの秘密!」~「はやぶさ2」トークライブ シーズン2~

    福岡市科学館   2020.7

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

    はやぶさ初号機の回収試料分析をきっかけに、はやぶさシリーズとは約20年のお付き合い。現在、はやぶさ2サンプル初期分析チームのサブチームリーダーの一人であり、帰還カプセル回収チームメンバーでもある。希ガス分析が専門。

  • 福岡市立西陵小学校の学童保育施設にて、探査機はやぶさ2に関する講演と体験授業(かんたんな実験)を行った。

    福岡市立西陵小学校、学童保育施設  福岡市立西陵小学校、学童保育施設  2019.8

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Other

  • リカレント教育として、高校教員の方々を対象として、研究活動などに関する講演を行った。

    九州大学  九州大学伊都キャンパス  2019.8

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Seminar, workshop

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Media Coverage

  • はやぶさ2試料分析に関して TV or radio program

    NHK  2022.10

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    はやぶさ2試料分析に関して

  • はやぶさ2探査機について Newspaper, magazine

    毎日新聞  2020.12

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    はやぶさ2探査機について

  • 一般向け科学解説記事 Newspaper, magazine

    読売新聞  2019.4

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    一般向け科学解説記事

  • はやぶさ2探査機のサンプル回収装置開発について TV or radio program

    福岡放送  2014.12

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    はやぶさ2探査機のサンプル回収装置開発について

  • はやぶさ2探査機のサンプル回収装置開発について TV or radio program

    NHK、コズミックフロント  2014.12

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    はやぶさ2探査機のサンプル回収装置開発について

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