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Ryuji Okazaki Last modified date:2023.12.07

Associate Professor / Material Science of Solar Planets
Department of Earth and Planetary Sciences
Faculty of Sciences


Graduate School
Undergraduate School


Homepage
https://kyushu-u.elsevierpure.com/en/persons/ryuji-okazaki
 Reseacher Profiling Tool Kyushu University Pure
http://jupiter.geo.kyushu-u.ac.jp/
Department of Earth and Planetary Sciences
Faculty of Sciences
Kyushu University .
Academic Degree
Doctor of Science
Country of degree conferring institution (Overseas)
No
Field of Specialization
Planetary Material Science
Total Priod of education and research career in the foreign country
00years00months
Outline Activities
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.
Research
Research Interests
  • Understanding of the condition and settings of chemical reaction in the interstellar space.
    keyword : interstellar space, organic matter, gas, ice
    2020.11~2025.03.
  • Recovery of the re-entry capsule of the Hayabusa2 spacecraft.
    keyword : Hayabusa2
    2018.04~2021.03.
  • Initial analysis of the Hayabusa2 return sample
    keyword : Hayabusa2
    2019.04~2022.06.
  • Pu-Xe isochron dating for eucrties
    keyword : eucrite, isochoron, Pu-Xe
    2017.10~2019.09.
  • Development of Hayabusa-2
    keyword : Hayabusa-2
    2010.09~2014.03.
  • Noble gas analysis for an asteroid sample from Itokawa
    keyword : Hayabusa, Itokawa, asteroid, noble gas, solar system
    2010.08~2013.03.
  • Pre-compaction ages for Ca-Al-rich refractory inclusions (CAIs) in chondrites
    keyword : CAIs, pre-compaction age, solar nebula
    2011.04~2014.03.
  • Interaction between minerals, water, and organic materials in the early solar system.
    keyword : minerals, water, organic materials, the early solar system.
    2010.04~2014.03.
  • 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
    2007.04Chondrites are primitive meteorites and classified into several groups based on their mineralogy and chemistry. In order to deduce the origin of the diversity of chondrites, fine-grained matrix consisiting of the most primitive material aggregates have been investigated..
  • Chemistry, mineralogy, and isotopic characteristics of crystalline Antarctic micrometeorites.
    keyword : micrometeorites, comet, asteroids, meteorites, crystalline, noble gas, oxygen, rare earth elements
    2006.04~2008.05Micrometeorites are the major part of dust particles falling on the Earth. Coarse-grained micrometeorites consist of crystalline olivine, pyroxene, metal and suldfides. Their origin could be asteroidal and cometary. In order to understand the origin and evolution history of primitive materials in the solar system, mineralogy, chemistry, and isotope compositions of coarse-grained micrometeorites have been investigated..
  • Origin and history of the reduced material in the solar nebula
    keyword : solar nebula, reduced material, enstatite chondrites, noble gas, oxygen, rare earth elements
    2001.04~2006.12The origin and evolution history of the reduced materials in the solar system is not well understood. Investigated are highly reduced meteorites, enstatite chondrites, in respects of petrology, mineralogy, noble gas isotopes, oyxgen isotopes, and rare earth element abundances..
Academic Activities
Papers
1. Tachibana, S.; Sawada, H.; Okazaki, R.; Takano, Y.; Sakamoto, K.; Miura, Y. N.; Okamoto, C.; Yano, H.; Yamanouchi, S.; Michel, P.; Zhang, Y.; Schwartz, S.; Thuillet, F.; Yurimoto, H.; Nakamura, T.; Noguchi, T.; Yabuta, H.; Naraoka, H.; Tsuchiyama, A.; Imae, N.; Kurosawa, K.; Nakamura, A. M.; Ogawa, K.; Sugita, S.; Morota, T.; Honda, R.; Kameda, S.; Tatsumi, E.; Cho, Y.; Yoshioka, K.; Yokota, Y.; Hayakawa, M.; Matsuoka, M.; Sakatani, N.; Yamada, M.; Kouyama, T.; Suzuki, H.; Honda, C.; Yoshimitsu, T.; Kubota, T.; Demura, H.; Yada, T.; Nishimura, M.; Yogata, K.; Nakato, A.; Yoshitake, M.; Suzuki, A. I.; Furuya, S.; Hatakeda, K.; Miyazaki, A.; Kumagai, K.; Okada, T.; Abe, M.; Usui, T.; Ireland, T. R.; Fujimoto, M.; Yamada, T.; Arakawa, M.; Connolly, H. C.; Fujii, A.; Hasegawa, S.; Hirata, N.; Hirata, N.; Hirose, C.; Hosoda, S.; Iijima, Y.; Ikeda, H.; Ishiguro, M.; Ishihara, Y.; Iwata, T.; Kikuchi, S.; Kitazato, K.; Lauretta, D. S.; Libourel, G.; Marty, B.; Matsumoto, K.; Michikami, T.; Mimasu, Y.; Miura, A.; Mori, O.; Nakamura-Messenger, K.; Namiki, N.; Nguyen, A. N.; Nittler, L. R.; Noda, H.; Noguchi, R.; Ogawa, N.; Ono, G.; Ozaki, M.; Senshu, H.; Shimada, T.; Shimaki, Y.; Shirai, K.; Soldini, S.; Takahashi, T.; Takei, Y.; Takeuchi, H.; Tsukizaki, R.; Wada, K.; Yamamoto, Y.; Yoshikawa, K.; Yumoto, K.; Zolensky, M. E.; Nakazawa, S.; Terui, F.; Tanaka, S.; Saiki, T.; Yoshikawa, M.; Watanabe, S.; Tsuda, Y., Pebbles and sand on asteroid (162173) Ryugu: In situ observation and particles returned to Earth, Science, 10.1126/science.abj8624 , 2022.03.
2. Noguchi, Takaaki; Matsumoto, Rikako; Yabuta, Hikaru; Kobayashi, Hanae; Miyake, Akira; Naraoka, Hiroshi; Okazaki, Ryuji; Imae, Naoya; Yamaguchi, Akira; Kilcoyne, A. L. David; Takeichi, Yasuo; Takahashi, Yoshio, Antarctic micrometeorite composed of CP and CS IDP-like material: A micro-breccia originated from a partially ice-melted comet-like small body, Meteoritics & Planetary Science, 10.1111/maps.13919 , 2022.11.
3. Okazaki, Ryuji; Miura, Yayoi N.; Takano, Yoshinori; Sawada, Hirotaka; Sakamoto, Kanako; Yada, Toru; Yamada, Keita; Kawagucci, Shinsuke; Matsui, Yohei; Hashizume, Ko; Ishida, Akizumi; Broadley, Michael W.; Marty, Bernard; Byrne, David; Füri, Evelyn; Meshik, Alex; Pravdivtseva, Olga; Busemann, Henner; Riebe, My E. I.; Gilmour, Jamie; Park, Jisun; Bajo, Ken-ichi; Righter, Kevin; Sakai, Saburo; Sekimoto, Shun; Kitajima, Fumio; Crowther, Sarah A.; Iwata, Naoyoshi; Shirai, Naoki; Ebihara, Mitsuru; Yokochi, Reika; Nishiizumi, Kunihiko; Nagao, Keisuke; Lee, Jong Ik; Clay, Patricia; Kano, Akihiro; Caffee, Marc W.; Uemura, Ryu; Inagaki, Makoto; Krietsch, Daniela; Maden, Colin; Yamamoto, Mizuki; Fawcett, Lydia; Lawton, Thomas; Nakamura, Tomoki; Naraoka, Hiroshi; Noguchi, Takaaki; Yabuta, Hikaru; Yurimoto, Hisayoshi; Tsuda, Yuichi; Watanabe, Sei-ichiro; Abe, Masanao; Arakawa, Masahiko; Fujii, Atsushi; Hayakawa, Masahiko; Hirata, Naoyuki; Hirata, Naru; Honda, Rie; Honda, Chikatoshi; Hosoda, Satoshi; Iijima, Yu-ichi; Ikeda, Hitoshi; Ishiguro, Masateru; Ishihara, Yoshiaki; Iwata, Takahiro; Kawahara, Kosuke; Kikuchi, Shota; Kitazato, Kohei; Matsumoto, Koji; Matsuoka, Moe; Michikami, Tatsuhiro; Mimasu, Yuya; Miura, Akira; Morota, Tomokatsu; Nakazawa, Satoru; Namiki, Noriyuki; Noda, Hirotomo; Noguchi, Rina; Ogawa, Naoko; Ogawa, Kazunori; Okada, Tatsuaki; Okamoto, Chisato; Ono, Go; Ozaki, Masanobu; Saiki, Takanao; Sakatani, Naoya; Senshu, Hiroki; Shimaki, Yuri; Shirai, Kei; Sugita, Seiji; Takei, Yuto; Takeuchi, Hiroshi; Tanaka, Satoshi; Tatsumi, Eri; Terui, Fuyuto; Tsukizaki, Ryudo; Wada, Koji; Yamada, Manabu; Yamada, Tetsuya; Yamamoto, Yukio; Yano, Hajime; Yokota, Yasuhiro; Yoshihara, Keisuke; Yoshikawa, Makoto; Yoshikawa, Kent; Furuya, Shizuho; Hatakeda, Kentaro; Hayashi, Tasuku; Hitomi, Yuya; Kumagai, Kazuya; Miyazaki, Akiko; Nakato, Aiko; Nishimura, Masahiro; Soejima, Hiromichi; Iwamae, Ayako; Yamamoto, Daiki; Yogata, Kasumi; Yoshitake, Miwa; Fukai, Ryota; Usui, Tomohiro; Ireland, Trevor; Connolly, Harold C., Jr.; Lauretta, Dante S.; Tachibana, Shogo , First asteroid gas sample delivered by the Hayabusa2 mission: A treasure box from Ryugu, Science Advances, 10.1126/sciadv.abo7239, 2022.11.
4. Miura, Yayoi N.; Okazaki, Ryuji; Takano, Yoshinori; Sakamoto, Kanako; Tachibana, Shogo; Yamada, Keita; Sakai, Saburo; Sawada, Hirotaka, The GAs Extraction and Analyses system (GAEA) for immediate extraction and measurements of volatiles in the Hayabusa2 sample container, Earth, Planets and Space, 10.1186/s40623-022-01638-x , 2022.12.
5. Sakamoto, Kanako; Takano, Yoshinori; Sawada, Hirotaka; Okazaki, Ryuji; Noguchi, Takaaki; Uesugi, Masayuki; Yano, Hajime; Yada, Toru; Abe, Masanao; Tachibana, Shogo; Hayabusa2 Project Team, Environmental assessment in the prelaunch phase of Hayabusa2 for safety declaration of returned samples from the asteroid (162173) Ryugu: background monitoring and risk management during development of the sampler system, Earth, Planets and Space, 10.1186/s40623-022-01628-z, 2021.12.
6. Okazaki, Ryuji; Yamanouchi, Shinji; Shimada, Kazuhiko; Baba, Atsushi; Kitajima, Fumio; Yada, Toru, Methods and tools for handling, transportation, weighing, and pelletization applied to the initial analysis of volatile components in the Hayabusa2 samples, Earth, Planets and Space, 10.1186/s40623-022-01747-7, 2022.12.
7. Naraoka, Hiroshi; Hashiguchi, Minako; Okazaki, Ryuji, Soluble Sulfur-Bearing Organic Compounds in Carbonaceous Meteorites: Implications for Chemical Evolution in Primitive Asteroids, ACS Earth and Space Chemistry, 10.1021/acsearthspacechem.2c00157 , 2023.01.
8. 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, Macromolecular organic matter in samples of the asteroid (162173) Ryugu, Science, 2023.03.
9. Noguchi, Takaaki; Matsumoto, Toru; Miyake, Akira; Igami, Yohei; Haruta, Mitsutaka; Saito, Hikaru; Hata, Satoshi; Seto, Yusuke; Miyahara, Masaaki; Tomioka, Naotaka; Ishii, Hope A.; Bradley, John P.; Ohtaki, Kenta K.; Dobricǎ, Elena; Leroux, Hugues; Le Guillou, Corentin; Jacob, Damien; de la Peña, Francisco; Laforet, Sylvain; Marinova, Maya; Langenhorst, Falko; Harries, Dennis; Beck, Pierre; Phan, Thi H. V.; Rebois, Rolando; Abreu, Neyda M.; Gray, Jennifer; Zega, Thomas; Zanetta, Pierre-M.; Thompson, Michelle S.; Stroud, Rhonda; Burgess, Kate; Cymes, Brittany A.; Bridges, John C.; Hicks, Leon; Lee, Martin R.; Daly, Luke; Bland, Phil A.; Zolensky, Michael E.; Frank, David R.; Martinez, James; Tsuchiyama, Akira; Yasutake, Masahiro; Matsuno, Junya; Okumura, Shota; Mitsukawa, Itaru; Uesugi, Kentaro; Uesugi, Masayuki; Takeuchi, Akihisa; Sun, Mingqi; Enju, Satomi; Takigawa, Aki; Michikami, Tatsuhiro; Nakamura, Tomoki; Matsumoto, Megumi; Nakauchi, Yusuke; Abe, Masanao; Arakawa, Masahiko; Fujii, Atsushi; Hayakawa, Masahiko; Hirata, Naru; Hirata, Naoyuki; Honda, Rie; Honda, Chikatoshi; Hosoda, Satoshi; Iijima, Yu-ichi; Ikeda, Hitoshi; Ishiguro, Masateru; Ishihara, Yoshiaki; Iwata, Takahiro; Kawahara, Kousuke; Kikuchi, Shota; Kitazato, Kohei; Matsumoto, Koji; Matsuoka, Moe; Mimasu, Yuya; Miura, Akira; Morota, Tomokatsu; Nakazawa, Satoru; Namiki, Noriyuki; Noda, Hirotomo; Noguchi, Rina; Ogawa, Naoko; Ogawa, Kazunori; Okada, Tatsuaki; Okamoto, Chisato; Ono, Go; Ozaki, Masanobu; Saiki, Takanao; Sakatani, Naoya; Sawada, Hirotaka; Senshu, Hiroki; Shimaki, Yuri; Shirai, Kei; Sugita, Seiji; Takei, Yuto; Takeuchi, Hiroshi; Tanaka, Satoshi; Tatsumi, Eri; Terui, Fuyuto; Tsukizaki, Ryudo; Wada, Koji; Yamada, Manabu; Yamada, Tetsuya; Yamamoto, Yukio; Yano, Hajime; Yokota, Yasuhiro; Yoshihara, Keisuke; Yoshikawa, Makoto; Yoshikawa, Kent; Fukai, Ryohta; Furuya, Shizuho; Hatakeda, Kentaro; Hayashi, Tasuku; Hitomi, Yuya; Kumagai, Kazuya; Miyazaki, Akiko; Nakato, Aiko; Nishimura, Masahiro; Soejima, Hiromichi; Suzuki, Ayako I.; Usui, Tomohiro; Yada, Toru; Yamamoto, Daiki; Yogata, Kasumi; Yoshitake, Miwa; Connolly, Harold C.; Lauretta, Dante S.; Yurimoto, Hisayoshi; Nagashima, Kazuhide; Kawasaki, Noriyuki; Sakamoto, Naoya; Okazaki, Ryuji; Yabuta, Hikaru; Naraoka, Hiroshi; Sakamoto, Kanako; Tachibana, Shogo; Watanabe, Sei-ichiro; Tsuda, Yuichi, A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu, Nature Astronomy, 10.1038/s41550-022-01841-6, 2023.02.
10. Broadley, M. W.; Byrne, D. J.; Füri, E.; Zimmermann, L.; Marty, B.; Okazaki, R.; Yada, T.; Kitajima, F.; Tachibana, S.; Yogata, K.; Sakamoto, K.; Yurimoto, H.; Nakamura, T.; Noguchi, T.; Naraoka, H.; Yabuta, H.; Watanabe, S.; Tsuda, Y.; Nishimura, M.; Nakato, A.; Miyazaki, A.; Abe, M.; Okada, T.; Usui, T.; Yoshikawa, M.; Saiki, T.; Tanaka, S.; Terui, F.; Nakazawa, S.; Busemann, H.; Hashizume, K.; Gilmour, J. D.; Meshik, A.; Riebe, M. E. I.; Krietsch, D.; Maden, C.; Ishida, A.; Clay, P.; Crowther, S. A.; Fawcett, L.; Lawton, T.; Pravdivtseva, O.; Miura, Y. N.; Park, J.; Bajo, K.; Takano, Y.; Yamada, K.; Kawagucci, S.; Matsui, Y.; Yamamoto, M.; Righter, K.; Sakai, S.; Iwata, N.; Shirai, N.; Sekimoto, S.; Inagaki, M.; Ebihara, M.; Yokochi, R.; Nishiizumi, K.; Nagao, K.; Lee, J. I.; Kano, A.; Caffee, M. W.; Uemura, R, The noble gas and nitrogen relationship between Ryugu and carbonaceous chondrites, Geochimica et Cosmochimica Acta, 10.1016/j.gca.2023.01.020, 2023.05.
11. Okazaki, Ryuji; Marty, Bernard; Busemann, Henner; Hashizume, Ko; Gilmour, Jamie D.; Meshik, Alex; Yada, Toru; Kitajima, Fumio; Broadley, Michael W.; Byrne, David; Füri, Evelyn; Riebe, My E. I.; Krietsch, Daniela; Maden, Colin; Ishida, Akizumi; Clay, Patricia; Crowther, Sarah A.; Fawcett, Lydia; Lawton, Thomas; Pravdivtseva, Olga; Miura, Yayoi N.; Park, Jisun; Bajo, Ken-ichi; Takano, Yoshinori; Yamada, Keita; Kawagucci, Shinsuke; Matsui, Yohei; Yamamoto, Mizuki; Righter, Kevin; Sakai, Saburo; Iwata, Naoyoshi; Shirai, Naoki; Sekimoto, Shun; Inagaki, Makoto; Ebihara, Mitsuru; Yokochi, Reika; Nishiizumi, Kunihiko; Nagao, Keisuke; Lee, Jong Ik; Kano, Akihiro; Caffee, Marc W.; Uemura, Ryu; Nakamura, Tomoki; Naraoka, Hiroshi; Noguchi, Takaaki; Yabuta, Hikaru; Yurimoto, Hisayoshi; Tachibana, Shogo; Sawada, Hirotaka; Sakamoto, Kanako; Abe, Masanao; Arakawa, Masahiko; Fujii, Atsushi; Hayakawa, Masahiko; Hirata, Naoyuki; Hirata, Naru; Honda, Rie; Honda, Chikatoshi; Hosoda, Satoshi; Iijima, Yu-ichi; Ikeda, Hitoshi; Ishiguro, Masateru; Ishihara, Yoshiaki; Iwata, Takahiro; Kawahara, Kosuke; Kikuchi, Shota; Kitazato, Kohei; Matsumoto, Koji; Matsuoka, Moe; Michikami, Tatsuhiro; Mimasu, Yuya; Miura, Akira; Morota, Tomokatsu; Nakazawa, Satoru; Namiki, Noriyuki; Noda, Hirotomo; Noguchi, Rina; Ogawa, Naoko; Ogawa, Kazunori; Okada, Tatsuaki; Okamoto, Chisato; Ono, Go; Ozaki, Masanobu; Saiki, Takanao; Sakatani, Naoya; Senshu, Hiroki; Shimaki, Yuri; Shirai, Kei; Sugita, Seiji; Takei, Yuto; Takeuchi, Hiroshi; Tanaka, Satoshi; Tatsumi, Eri; Terui, Fuyuto; Tsukizaki, Ryudo; Wada, Koji; Yamada, Manabu; Yamada, Tetsuya; Yamamoto, Yukio; Yano, Hajime; Yokota, Yasuhiro; Yoshihara, Keisuke; Yoshikawa, Makoto; Yoshikawa, Kent; Furuya, Shizuho; Hatakeda, Kentaro; Hayashi, Tasuku; Hitomi, Yuya; Kumagai, Kazuya; Miyazaki, Akiko; Nakato, Aiko; Nishimura, Masahiro; Soejima, Hiromichi; Iwamae, Ayako; Yamamoto, Daiki; Yogata, Kasumi; Yoshitake, Miwa; Fukai, Ryota; Usui, Tomohiro; Connolly, Harold C.; Lauretta, Dante; Watanabe, Sei-ichiro; Tsuda, Yuichi, Noble gases and nitrogen in samples of asteroid Ryugu record its volatile sources and recent surface evolution, Science, 10.1126/science.abo0431 , 2023.03, The near-Earth carbonaceous asteroid (162173) Ryugu is expected to contain volatile chemical species that could provide information on the origin of Earth’s volatiles. Samples of Ryugu were retrieved by the Hayabusa2 spacecraft. We measured noble gas and nitrogen isotopes in Ryugu samples and found that they are dominated by presolar and primordial components, incorporated during Solar System formation. Noble gas concentrations are higher than those in Ivuna-type carbonaceous (CI) chondrite meteorites. Several host phases of isotopically distinct nitrogen have different abundances among the samples. Our measurements support a close relationship between Ryugu and CI chondrites. Noble gases produced by galactic cosmic rays, indicating a ~5 million year exposure, and from implanted solar wind record the recent irradiation history of Ryugu after it migrated to its current orbit..
12. Yokoyama, Tetsuya; Nagashima, Kazuhide; Nakai, Izumi; Young, Edward D.; Abe, Yoshinari; Aléon, Jérôme; Alexander, Conel M. O. ’D.; Amari, Sachiko; Amelin, Yuri; Bajo, Ken-ichi; Bizzarro, Martin; Bouvier, Audrey; Carlson, Richard W.; Chaussidon, Marc; Choi, Byeon-Gak; Dauphas, Nicolas; Davis, Andrew M.; Di Rocco, Tommaso; Fujiya, Wataru; Fukai, Ryota; Gautam, Ikshu; Haba, Makiko K.; Hibiya, Yuki; Hidaka, Hiroshi; Homma, Hisashi; Hoppe, Peter; Huss, Gary R.; Ichida, Kiyohiro; Iizuka, Tsuyoshi; Ireland, Trevor R.; Ishikawa, Akira; Ito, Motoo; Itoh, Shoichi; Kawasaki, Noriyuki; Kita, Noriko T.; Kitajima, Kouki; Kleine, Thorsten; Komatani, Shintaro; Krot, Alexander N.; Liu, Ming-Chang; Masuda, Yuki; McKeegan, Kevin D.; Morita, Mayu; Motomura, Kazuko; Moynier, Frédéric; Nguyen, Ann; Nittler, Larry; Onose, Morihiko; Pack, Andreas; Park, Changkun; Piani, Laurette; Qin, Liping; Russell, Sara S.; Sakamoto, Naoya; Schönbächler, Maria; Tafla, Lauren; Tang, Haolan; Terada, Kentaro; Terada, Yasuko; Usui, Tomohiro; Wada, Sohei; Wadhwa, Meenakshi; Walker, Richard J.; Yamashita, Katsuyuki; Yin, Qing-Zhu; Yoneda, Shigekazu; Yui, Hiroharu; Zhang, Ai-Cheng; Connolly, Harold C.; Lauretta, Dante S.; Nakamura, Tomoki; Naraoka, Hiroshi; Noguchi, Takaaki; Okazaki, Ryuji; Sakamoto, Kanako; Yabuta, Hikaru; Abe, Masanao; Arakawa, Masahiko; Fujii, Atsushi; Hayakawa, Masahiko; Hirata, Naoyuki; Hirata, Naru; Honda, Rie; Honda, Chikatoshi; Hosoda, Satoshi; Iijima, Yu-ichi; Ikeda, Hitoshi; Ishiguro, Masateru; Ishihara, Yoshiaki; Iwata, Takahiro; Kawahara, Kosuke; Kikuchi, Shota; Kitazato, Kohei; Matsumoto, Koji; Matsuoka, Moe; Michikami, Tatsuhiro; Mimasu, Yuya; Miura, Akira; Morota, Tomokatsu; Nakazawa, Satoru; Namiki, Noriyuki; Noda, Hirotomo; Noguchi, Rina; Ogawa, Naoko; Ogawa, Kazunori; Okada, Tatsuaki; Okamoto, Chisato; Ono, Go; Ozaki, Masanobu; Saiki, Takanao; Sakatani, Naoya; Sawada, Hirotaka; Senshu, Hiroki; Shimaki, Yuri; Shirai, Kei; Sugita, Seiji; Takei, Yuto; Takeuchi, Hiroshi; Tanaka, Satoshi; Tatsumi, Eri; Terui, Fuyuto; Tsuda, Yuichi; Tsukizaki, Ryudo; Wada, Koji; Watanabe, Sei-ichiro; Yamada, Manabu; Yamada, Tetsuya; Yamamoto, Yukio; Yano, Hajime; Yokota, Yasuhiro; Yoshihara, Keisuke; Yoshikawa, Makoto; Yoshikawa, Kent; Furuya, Shizuho; Hatakeda, Kentaro; Hayashi, Tasuku; Hitomi, Yuya; Kumagai, Kazuya; Miyazaki, Akiko; Nakato, Aiko; Nishimura, Masahiro; Soejima, Hiromichi; Suzuki, Ayako; Yada, Toru; Yamamoto, Daiki; Yogata, Kasumi; Yoshitake, Miwa; Tachibana, Shogo; Yurimoto, Hisayoshi, Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites, Science, 10.1126/science.abn7850, 2023.03.
13. Nakamura, T.; Matsumoto, M.; Amano, K.; Enokido, Y.; Zolensky, M. E.; Mikouchi, T.; Genda, H.; Tanaka, S.; Zolotov, M. Y.; Kurosawa, K.; Wakita, S.; Hyodo, R.; Nagano, H.; Nakashima, D.; Takahashi, Y.; Fujioka, Y.; Kikuiri, M.; Kagawa, E.; Matsuoka, M.; Brearley, A. J.; Tsuchiyama, A.; Uesugi, M.; Matsuno, J.; Kimura, Y.; Sato, M.; Milliken, R. E.; Tatsumi, E.; Sugita, S.; Hiroi, T.; Kitazato, K.; Brownlee, D.; Joswiak, D. J.; Takahashi, M.; Ninomiya, K.; Takahashi, T.; Osawa, T.; Terada, K.; Brenker, F. E.; Tkalcec, B. J.; Vincze, L.; Brunetto, R.; Aléon-Toppani, A.; Chan, Q. H. S.; Roskosz, M.; Viennet, J. -C.; Beck, P.; Alp, E. E.; Michikami, T.; Nagaashi, Y.; Tsuji, T.; Ino, Y.; Martinez, J.; Han, J.; Dolocan, A.; Bodnar, R. J.; Tanaka, M.; Yoshida, H.; Sugiyama, K.; King, A. J.; Fukushi, K.; Suga, H.; Yamashita, S.; Kawai, T.; Inoue, K.; Nakato, A.; Noguchi, T.; Vilas, F.; Hendrix, A. R.; Jaramillo-Correa, C.; Domingue, D. L.; Dominguez, G.; Gainsforth, Z.; Engrand, C.; Duprat, J.; Russell, S. S.; Bonato, E.; Ma, C.; Kawamoto, T.; Wada, T.; Watanabe, S.; Endo, R.; Enju, S.; Riu, L.; Rubino, S.; Tack, P.; Takeshita, S.; Takeichi, Y.; Takeuchi, A.; Takigawa, A.; Takir, D.; Tanigaki, T.; Taniguchi, A.; Tsukamoto, K.; Yagi, T.; Yamada, S.; Yamamoto, K.; Yamashita, Y.; Yasutake, M.; Uesugi, K.; Umegaki, I.; Chiu, I.; Ishizaki, T.; Okumura, S.; Palomba, E.; Pilorget, C.; Potin, S. M.; Alasli, A.; Anada, S.; Araki, Y.; Sakatani, N.; Schultz, C.; Sekizawa, O.; Sitzman, S. D.; Sugiura, K.; Sun, M.; Dartois, E.; De Pauw, E.; Dionnet, Z.; Djouadi, Z.; Falkenberg, G.; Fujita, R.; Fukuma, T.; Gearba, I. R.; Hagiya, K.; Hu, M. Y.; Kato, T.; Kawamura, T.; Kimura, M.; Kubo, M. K.; Langenhorst, F.; Lantz, C.; Lavina, B.; Lindner, M.; Zhao, J.; Vekemans, B.; Baklouti, D.; Bazi, B.; Borondics, F.; Nagasawa, S.; Nishiyama, G.; Nitta, K.; Mathurin, J.; Matsumoto, T.; Mitsukawa, I.; Miura, H.; Miyake, A.; Miyake, Y.; Yurimoto, H.; Okazaki, R.; Yabuta, H.; Naraoka, H.; Sakamoto, K.; Tachibana, S.; Connolly, H. C.; Lauretta, D. S.; Yoshitake, M.; Yoshikawa, M.; Yoshikawa, K.; Yoshihara, K.; Yokota, Y.; Yogata, K.; Yano, H.; Yamamoto, Y.; Yamamoto, D.; Yamada, M.; Yamada, T.; Yada, T.; Wada, K.; Usui, T.; Tsukizaki, R.; Terui, F.; Takeuchi, H.; Takei, Y.; Iwamae, A.; Soejima, H.; Shirai, K.; Shimaki, Y.; Senshu, H.; Sawada, H.; Saiki, T.; Ozaki, M.; Ono, G.; Okada, T.; Ogawa, N.; Ogawa, K.; Noguchi, R.; Noda, H.; Nishimura, M.; Namiki, N.; Nakazawa, S.; Morota, T.; Miyazaki, A.; Miura, A.; Mimasu, Y.; Matsumoto, K.; Kumagai, K.; Kouyama, T.; Kikuchi, S.; Kawahara, K.; Kameda, S.; Iwata, T.; Ishihara, Y.; Ishiguro, M.; Ikeda, H.; Hosoda, S.; Honda, R.; Honda, C.; Hitomi, Y.; Hirata, N.; Hirata, N.; Hayashi, T.; Hayakawa, M.; Hatakeda, K.; Furuya, S.; Fukai, R.; Fujii, A.; Cho, Y.; Arakawa, M.; Abe, M.; Watanabe, S.; Tsuda, Y., Formation and evolution of carbonaceous asteroid Ryugu: Direct evidence from returned samples, Science, 10.1126/science.abn8671, 2023.03.
14. Naraoka, Hiroshi; Takano, Yoshinori; Dworkin, Jason P.; Oba, Yasuhiro; Hamase, Kenji; Furusho, Aogu; Ogawa, Nanako O.; Hashiguchi, Minako; Fukushima, Kazuhiko; Aoki, Dan; Schmitt-Kopplin, Philippe; Aponte, José C.; Parker, Eric T.; Glavin, Daniel P.; McLain, Hannah L.; Elsila, Jamie E.; Graham, Heather V.; Eiler, John M.; Orthous-Daunay, Francois-Regis; Wolters, Cédric; Isa, Junko; Vuitton, Véronique; Thissen, Roland; Sakai, Saburo; Yoshimura, Toshihiro; Koga, Toshiki; Ohkouchi, Naohiko; Chikaraishi, Yoshito; Sugahara, Haruna; Mita, Hajime; Furukawa, Yoshihiro; Hertkorn, Norbert; Ruf, Alexander; Yurimoto, Hisayoshi; Nakamura, Tomoki; Noguchi, Takaaki; Okazaki, Ryuji; Yabuta, Hikaru; Sakamoto, Kanako; Tachibana, Shogo; Connolly, Harold C.; Lauretta, Dante S.; Abe, Masanao; Yada, Toru; Nishimura, Masahiro; Yogata, Kasumi; Nakato, Aiko; Yoshitake, Miwa; Suzuki, Ayako; Miyazaki, Akiko; Furuya, Shizuho; Hatakeda, Kentaro; Soejima, Hiromichi; Hitomi, Yuya; Kumagai, Kazuya; Usui, Tomohiro; Hayashi, Tasuku; Yamamoto, Daiki; Fukai, Ryota; Kitazato, Kohei; Sugita, Seiji; Namiki, Noriyuki; Arakawa, Masahiko; Ikeda, Hitoshi; Ishiguro, Masateru; Hirata, Naru; Wada, Koji; Ishihara, Yoshiaki; Noguchi, Rina; Morota, Tomokatsu; Sakatani, Naoya; Matsumoto, Koji; Senshu, Hiroki; Honda, Rie; Tatsumi, Eri; Yokota, Yasuhiro; Honda, Chikatoshi; Michikami, Tatsuhiro; Matsuoka, Moe; Miura, Akira; Noda, Hirotomo; Yamada, Tetsuya; Yoshihara, Keisuke; Kawahara, Kosuke; Ozaki, Masanobu; Iijima, Yu-ichi; Yano, Hajime; Hayakawa, Masahiko; Iwata, Takahiro; Tsukizaki, Ryudo; Sawada, Hirotaka; Hosoda, Satoshi; Ogawa, Kazunori; Okamoto, Chisato; Hirata, Naoyuki; Shirai, Kei; Shimaki, Yuri; Yamada, Manabu; Okada, Tatsuaki; Yamamoto, Yukio; Takeuchi, Hiroshi; Fujii, Atsushi; Takei, Yuto; Yoshikawa, Kento; Mimasu, Yuya; Ono, Go; Ogawa, Naoko; Kikuchi, Shota; Nakazawa, Satoru; Terui, Fuyuto; Tanaka, Satoshi; Saiki, Takanao; Yoshikawa, Makoto; Watanabe, Sei-ichiro; Tsuda, Yuichi, Soluble organic molecules in samples of the carbonaceous asteroid (162173) Ryugu, Science, 10.1126/science.abn9033, 2023.03.
15. 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, Hayabusa-returned sample curation in the Planetary Material Sample Curation Facility of JAXA., Meteoritics & Planetary Science, 10.1111/maps.12027, 49, 2, 135-153, 2014.02.
16. 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, Space weathered rims found on the surfaces of the Itokawa dust particles., Meteoritics & Planetary Science, 49, 2, 188-214, 2013.05.
17. Jenniskens P., 他, Okazaki Ryuji, 他, Radar-Enabled Recovery of the Sutter's Mill Meteorite, a Carbonaceous Chondrite Regolith Breccia, Science, 10.1126/science.1227163, 338, 6114, 1583-1587, 2012.12.
18. K. Bajo, H. Sumino, M. Toyoda, Okazaki Ryuji, T. Osawa, M. Ishihara, I. Katakuse, K. Notsu, G. Igarashi, K. Nagao, Construction of a newly designed small-size mass spectrometer for helium isotope analysis: Toward the continuous monitoring of 3He/4He ratios in natural fluids., Mass Spectrometry, 10.5702, DOI:10.5702, 2012.11.
19. K. Nagao, R. Okazaki, T. Nakamura, Y. N. Miura, T. Osawa, K. Bajo, S. Matsuda, M. Ebihara, T. R. Ireland, F. Kitajima, H. Naraoka, T. Noguchi, A. Tsuchiyama, H. Yurimoto, M. E. Zolensky, M. Uesugi, K. Shirai, M. Abe, T. Yada, Y. Ishibashi, A. Fujimura, T. Mukai, M. Ueno, T. Okada, M. Yoshikawa, J. Kawaguchi., Irradiation history of Itokawa regolith material deduced from noble gases in the Hayabusa samples., Science, 333, 1128-1131, 2011.08.
20. T. Noguchi, T. Nakamura, M. Kimura, M. E. Zolensky, M. Tanaka, T. Hashimoto, M. Konno, A. Nakato, T. Ogami, A. Fujimura, M. Abe, T. Yada, T. Mukai, M. Ueno, T. Okada, K. Shirai, Y. Ishibashi, R. Okazaki., Incipient space weathering observed on the surface of Itokawa dust particles., Science, 333, 1121-1125, 2011.08.
21. Ryuji Okazaki, Nobuo Takaoka, Keisuke Nagao, Tomoki Nakamura, Noble gases in enstatite chondrites released by stepped crushing and heating, Meteoritics & Planetary Science, 10.1111/j.1945-5100.2010.01025.x, 45, 3, 339-360, 2010.03.
22. Okazaki Ryuji, K. Nagao, N. Imae, H. Kojima, Noble gas signatures of Antarctic nakhlites, Yamato (Y) 000593, Y000749, and Y000802, Antarctic Meteorite Research, 16, 58-79, 2003.03.
23. Okazaki Ryuji, Tomoki Nakamura, N. Takaoka, K. Nagao, Noble gases in ureilites released by crushing, Meteoritics and Planetary Sciences, 38, 5, 767-781, 2003.05.
24. Okazaki Ryuji, N. Takaoka, K. Nagao, Minoru Sekiya, Tomoki Nakamura, Noble-gas-rich chondrules in an enstatite meteorite, Nature, 10.1038/35090520, 412, 6849, 795-798, 2001.08.
25. Okazaki Ryuji, N. Takaoka, T. Nakamura, K. Nagao, Cosmic-ray exposure ages of enstatite chondrites, Antarctic Meteorite Research, 13, 153-169, 1999.03.
Presentations
1. 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, Isotopic compositions of noble gases and nitrogen in the Ryugu samples returned by Hayabusa2, The 53rd Lunar and Planetary Science Conference, 2022.03, 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.
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2. 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, Initial Analysis of Volatile Components in the Hayabusa2 Samples, Hayabusa Symposium 2021, 2021.11.
3. Ryuji Okazaki, Moeka Harada, Kasumi Yogata, In-situ K-Ar dating of rock samples by a combination of laser-induced breakdown spectroscopy (LIBS) and noble-gas mass spectrometry, 82nd Annual Meetings of the Meteoritical Society, 2019.07.
4. Nagao, K., Okazaki Ryuji, Miura, Y., Osawa, T., Gilmour, J. D., Nishimura, Y., Noble Gas Analysis of Two Hayabusa Samples as the First International A/O Investigation: A Progress Report , The 44th Lunar and Planetary Science Conference, 2013.03.
5. Tachibana, S., Sawada, H., Okazaki Ryuji, Takano, Y., Okamoto, C., Yano, H., Hayabusa-2 Sampler Team., Hayabusa-2 Sampler Team. The Sampling System of Hayabusa-2: Improvements from the Hayabusa Sampler, The 44th Lunar and Planetary Science Conference, 2013.03.
6. Mineralogy and isotope compositions of coarse-grained Antarctic micrometeorites. .
7. Noble-gas and oxygen isotopes and REE abundances in Antarctic micrometeorites. .
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