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3. Organic matter in carbonaceous chondrite lithologies of Almahata Sitta: Incorporation of previously unsampled carbonaceous chondrite lithologies into ureilitic regolith

Author

Kebukawa, Yoko, Zolensky, Michael E, Goodrich, Cyrena A, Ito, Motoo, Ogawa, Nanako O, Takano, Yoshinori, Ohkouchi, Naohiko, Kiryu, Kento, Igisu, Motoko, Shibuya, Takazo, Marcus, Matthew A, Ohigashi, Takuji, Martinez, James, Kodama, Yu, Shaddad, Muawia H, and Jenniskens, Peter

Subjects
Space Sciences, Physical Sciences, Astronomical and Space Sciences, Geochemistry, Geology, Geochemistry & Geophysics, Astronomical sciences, Space sciences
Abstract

The Almahata Sitta (AhS) meteorite is a unique polymict ureilite. Recently, carbonaceous chondritic lithologies were identified in AhS. Organic matter (OM) is ubiquitously found in primitive carbonaceous chondrites. The molecular and isotopic characteristics of this OM reflect its origin and parent body processes, and are particularly sensitive to heating. The C1 lithologies AhS 671 and AhS 91A were investigated, focusing mainly on the OM. We found that the OM in these lithologies is unique and contains primitive isotopic signatures, but experienced slight heating possibly by short-term heating event(s). These characteristics support the idea that one or more carbonaceous chondritic bodies were incorporated into the ureilitic parent body. The uniqueness of the OM in the AhS samples implies that there were large variations in primitive carbonaceous chondritic materials in the solar system other than known primitive carbonaceous chondrite groups such as CI, CM, and CR chondrites.

Published
2021

4. A history of mild shocks experienced by the regolith particles on hydrated asteroid Ryugu

Author

Tomioka, Naotaka, Yamaguchi, Akira, Ito, Motoo, Uesugi, Masayuki, Imae, Naoya, Shirai, Naoki, Ohigashi, Takuji, Kimura, Makoto, Liu, Ming-Chang, Greenwood, Richard C., Uesugi, Kentaro, Nakato, Aiko, Yogata, Kasumi, Yuzawa, Hayato, Kodama, Yu, Hirahara, Kaori, Sakurai, Ikuya, Okada, Ikuo, Karouji, Yuzuru, Okazaki, Keishi, Kurosawa, Kosuke, Noguchi, Takaaki, Miyake, Akira, Miyahara, Masaaki, Seto, Yusuke, Matsumoto, Toru, Igami, Yohei, Nakazawa, Satoru, Okada, Tatsuaki, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Yoshikawa, Makoto, Miyazaki, Akiko, Nishimura, Masahiro, Yada, Toru, Abe, Masanao, Usui, Tomohiro, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Published
2023
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5. Insight into multi-step geological evolution of C-type asteroids from Ryugu particles

Author

Yamaguchi, Akira, Tomioka, Naotaka, Ito, Motoo, Shirai, Naoki, Kimura, Makoto, Greenwood, Richard C., Liu, Ming-Chang, McCain, Kaitlyn A., Matsuda, Nozomi, Uesugi, Masayuki, Imae, Naoya, Ohigashi, Takuji, Uesugi, Kentaro, Nakato, Aiko, Yogata, Kasumi, Yuzawa, Hayato, Kodama, Yu, Hirahara, Kaori, Sakurai, Ikuya, Okada, Ikuo, Karouji, Yuzuru, Nakazawa, Satoru, Okada, Tatsuaki, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Yoshikawa, Makoto, Miyazaki, Akiko, Nishimura, Masahiro, Yada, Toru, Abe, Masanao, Usui, Tomohiro, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Published
2023
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6. Early fluid activity on Ryugu inferred by isotopic analyses of carbonates and magnetite

Author

McCain, Kaitlyn A., Matsuda, Nozomi, Liu, Ming-Chang, McKeegan, Kevin D., Yamaguchi, Akira, Kimura, Makoto, Tomioka, Naotaka, Ito, Motoo, Imae, Naoya, Uesugi, Masayuki, Shirai, Naoki, Ohigashi, Takuji, Greenwood, Richard C., Uesugi, Kentaro, Nakato, Aiko, Yogata, Kasumi, Yuzawa, Hayato, Kodama, Yu, Hirahara, Kaori, Sakurai, Ikuya, Okada, Ikuo, Karouji, Yuzuru, Nakazawa, Satoru, Okada, Tatsuaki, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Yoshikawa, Makoto, Miyazaki, Akiko, Nishimura, Masahiro, Yada, Toru, Abe, Masanao, Usui, Tomohiro, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Published
2023
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7. Oxygen isotope evidence from Ryugu samples for early water delivery to Earth by CI chondrites

Author

Greenwood, Richard C., Franchi, Ian A., Findlay, Ross, Malley, James A., Ito, Motoo, Yamaguchi, Akira, Kimura, Makoto, Tomioka, Naotaka, Uesugi, Masayuki, Imae, Naoya, Shirai, Naoki, Ohigashi, Takuji, Liu, Ming-Chang, McCain, Kaitlyn A., Matsuda, Nozomi, McKeegan, Kevin D., Uesugi, Kentaro, Nakato, Aiko, Yogata, Kasumi, Yuzawa, Hayato, Kodama, Yu, Tsuchiyama, Akira, Yasutake, Masahiro, Hirahara, Kaori, Tekeuchi, Akihisa, Sekimoto, Shun, Sakurai, Ikuya, Okada, Ikuo, Karouji, Yuzuru, Nakazawa, Satoru, Okada, Tatsuaki, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Yoshikawa, Makoto, Miyazaki, Akiko, Nishimura, Masahiro, Yada, Toru, Abe, Masanao, Usui, Tomohiro, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Published
2023
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8. Incorporation of 16O-rich anhydrous silicates in the protolith of highly hydrated asteroid Ryugu

Author

Liu, Ming-Chang, McCain, Kaitlyn A., Matsuda, Nozomi, Yamaguchi, Akira, Kimura, Makoto, Tomioka, Naotaka, Ito, Motoo, Uesugi, Masayuki, Imae, Naoya, Shirai, Naoki, Ohigashi, Takuji, Greenwood, Richard C., Uesugi, Kentaro, Nakato, Aiko, Yogata, Kasumi, Yuzawa, Hayato, Kodama, Yu, Hirahara, Kaori, Sakurai, Ikuya, Okada, Ikuo, Karouji, Yuzuru, Nakazawa, Satoru, Okada, Tatsuaki, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Yoshikawa, Makoto, Miyazaki, Akiko, Nishimura, Masahiro, Yada, Toru, Abe, Masanao, Usui, Tomohiro, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Published
2022
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9. A pristine record of outer Solar System materials from asteroid Ryugu’s returned sample

Author

Ito, Motoo, Tomioka, Naotaka, Uesugi, Masayuki, Yamaguchi, Akira, Shirai, Naoki, Ohigashi, Takuji, Liu, Ming-Chang, Greenwood, Richard C., Kimura, Makoto, Imae, Naoya, Uesugi, Kentaro, Nakato, Aiko, Yogata, Kasumi, Yuzawa, Hayato, Kodama, Yu, Tsuchiyama, Akira, Yasutake, Masahiro, Findlay, Ross, Franchi, Ian A., Malley, James A., McCain, Kaitlyn A., Matsuda, Nozomi, McKeegan, Kevin D., Hirahara, Kaori, Takeuchi, Akihisa, Sekimoto, Shun, Sakurai, Ikuya, Okada, Ikuo, Karouji, Yuzuru, Arakawa, Masahiko, Fujii, Atsushi, Fujimoto, Masaki, 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, Mori, Osamu, 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, Ryota, Furuya, Shizuho, Hatakeda, Kentaro, Hayashi, Tasuku, Hitomi, Yuya, Kumagai, Kazuya, Miyazaki, Akiko, Nishimura, Masahiro, Soejima, Hiromichi, Iwamae, Ayako, Yamamoto, Daiki, Yoshitake, Miwa, Yada, Toru, Abe, Masanao, Usui, Tomohiro, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Published
2022
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10. Incidence and Risk Factors of Immediate Hypersensitivity Reactions and Immunization Stress-Related Responses With COVID-19 mRNA Vaccine

Author

Imai, Kazuo, Tanaka, Fumika, Kawano, Shuichi, Esaki, Kotoba, Arakawa, Junko, Nishiyama, Takashi, Seno, Soichiro, Hatanaka, Kosuke, Sugiura, Takao, Kodama, Yu, Yamada, Seigo, Iwamoto, Shinichiro, Takeshima, Shigeto, Abe, Nobujiro, Kamae, Chikako, Aono, Shigeaki, Ito, Toshimitsu, Yamamoto, Tetsuo, and Mizuguchi, Yasunori

Published
2022
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11. Heterogeneous nature of the carbonaceous chondrite breccia Aguas Zarcas – Cosmochemical characterization and origin of new carbonaceous chondrite lithologies

Author

Kerraouch, Imene, Kebukawa, Yoko, Bischoff, Addi, Zolensky, Michael E., Wölfer, Elias, Hellmann, Jan L., Ito, Motoo, King, Ashley, Trieloff, Mario, Barrat, Jean-Alix, Schmitt-Kopplin, Phillipe, Pack, Andreas, Patzek, Markus, Hanna, Romy D., Fockenberg, Thomas, Marrocchi, Yves, Fries, Marc, Mathurin, Jérémie, Dartois, Emmanuel, Duprat, Jean, Engrand, Cécile, Deniset, Ariane, Dazzi, Alexandre, Kiryu, Kento, Igisu, Motoko, Shibuya, Takazo, Wakabayashi, Daisuke, Yamashita, Shohei, Takeichi, Yasuo, Takahashi, Yoshio, Ohigashi, Takuji, Kodama, Yu, and Kondo, Masashi

Published
2022
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14. Mineralogical approach on laboratory weathering of uncontaminated Ryugu particles: Comparison with Orgueil and perspective for storage and analysis

Author

Imae, Naoya, primary, Tomioka, Naotaka, additional, Uesugi, Masayuki, additional, Kimura, Makoto, additional, Yamaguchi, Akira, additional, Ito, Motoo, additional, Greenwood, Richard C., additional, Kawai, Tatsuya, additional, Shirai, Naoki, additional, Ohigashi, Takuji, additional, Pilorget, Cedric, additional, Bibring, Jean‐Pierre, additional, Liu, Ming‐Chang, additional, Uesugi, Kentaro, additional, Nakato, Aiko, additional, Yogata, Kasumi, additional, Yuzawa, Hayato, additional, Kodama, Yu, additional, Yasutake, Masahiro, additional, Hirahara, Kaori, additional, Takeuchi, Akihisa, additional, Sakurai, Ikuya, additional, Okada, Ikuo, additional, Karouji, Yuzuru, additional, Yada, Toru, additional, Abe, Masanao, additional, and Usui, Tomohiro, additional

Published
2024
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15. Fast-neutron capture cross section data measurement of minor actinides for development of nuclear transmutation systems

Author

Katabuchi Tatsuya, Iwamoto Osamu, Hori Jun-ich, Kimura Atsushi, Iwamoto Nobuyuki, Nakamura Shoji, Rovira Gerard, Endo Shunsuke, Shibahara Yuji, Terada Kazushi, Kodama Yu, Nakano Hideto, Sato Yaoki, and Matsuura Shota

Subjects
Physics, QC1-999
Abstract

The neutron capture cross sections of 237Np, 243Am and 241Am in the keV energy region were measured by the time-of-flight method at the Japan Proton Accelerator Research Complex (J-PARC). Characterization of the minor actinide samples were made to reduce the uncertainties of the cross section. A neutron beam filter system was developed and installed in ANNRI to solve the double-bunch mode issue of J-PARC. The pulse-height weighting technique was employed to determine the neutron capture cross sections. The neutron capture cross sections of 237Np, 243Am and 241Am were determined with higher accuracies than the past experiments.

Published
2023
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16. Measurements of the Neutron Capture Cross Section of Am-243 with the ANNRI beamline, MLF/J-PARC

Author

Kodama Yu, Katabuchi Tatsuya, Rovira Gerard, Kimura Atsushi, Nakamura Shoji, Endo Shunsuke, Nakano Hideto, Sato Yaoki, Hori Jun-ichi, Shibahara Yuji, and Terada Kazushi

Subjects
Physics, QC1-999
Abstract

The neutron capture cross section of 243Am from thermal to 100 keV was measured using the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) at the Japan Proton Accelerator Research Complex (J-PARC). The time-of-flight (TOF) method using a NaI(Tl) detector was employed in these measurements and the pulse-height weighting technique was used to derive the neutron capture yield. The preliminary cross section was determined by normalizing the results to JENDL-4.0 cross section data at the third resonance of 243Am. In the thermal energy, the preliminary result is in good agreement with the two latest experimental data measured by the TOF and the activation methods but higher than the evaluated values in JENDL-5.

Published
2023
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17. Neutron Capture Cross Section Measurement and Resonance Analysis of 107Pd Using ANNRI at MLF/J-PARC

Author

Nakano Hideto, Katabuchi Tatsuya, Terada Kazushi, Kimura Atsushi, Nakamura Shoji, Endo Shunsuke, Rovira Gerard, and Kodama Yu

Subjects
Physics, QC1-999
Abstract

The neutron capture cross sections of 107Pd were measured using the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) at the Japan Proton Accelerator Research Complex (J-PARC). Capture γ-rays were detected with a NaI(Tl) spectrometer. The incident neutron energy was determined by the time-of-flight method. The preliminary cross section was derived from thermal to resonance energy region. In the resonance region, resonance parameters were derived by resonance analysis using REFIT code. The resonance parameter was close to the value of JENDL-4.0.

Published
2023
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21. 241Am Neutron Capture Cross Section Measurement using the NaI(Tl) spectrometer of the ANNRI beamline of J-PARC.

Author

Rovira, Gerard, Kimura, Atsushi, Nakamura, Shoji, Endo, Shunsuke, Iwamoto, Osamu, Iwamoto, Nobuyuki, Katabuchi, Tatsuya, Kodama, Yu, Nakano, Hideto, and Sato, Yaoki

Abstract

The neutron capture cross-section of 241Am was measured from 10 meV to about 500 keV using the NaI(Tl) spectrometer of the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) beamline in the Materials and Life Science Experimental Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC). The total energy detection principle was applied in conjunction with the pulse-height weighting technique to derive the neutron capture yield. The present cross-section results were normalized using a 197Au sample measurement by applying the saturated resonance method. The thermal cross section was measured to be 708 ± 22 b, in agreement with the evaluation in JENDL-5 of 709 b within uncertainties. In the keV region, the evaluated libraries of JENDL-5, ENDF/B-VIII.0 and JEFF-3.3 are in good agreement with the present results over 10 keV but show values lower by 30% to 70% below that energy. Moreover, the results of a resonance shape analysis of the resolved resonance region are also provided in the present paper. [ABSTRACT FROM AUTHOR]

Published
2024
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23. 241Am Neutron Capture Cross Section Measurement using the NaI(Tl) spectrometer of the ANNRI beamline of J-PARC

Author

Rovira, Gerard, Kimura, Atsushi, Nakamura, Shoji, Endo, Shunsuke, Iwamoto, Osamu, Iwamoto, Nobuyuki, Katabuchi, Tatsuya, Kodama, Yu, Nakano, Hideto, and Sato, Yaoki

Abstract

ABSTRACTThe neutron capture cross-section of 241Am was measured from 10 meV to about 500 keV using the NaI(Tl) spectrometer of the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) beamline in the Materials and Life Science Experimental Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC). The total energy detection principle was applied in conjunction with the pulse-height weighting technique to derive the neutron capture yield. The present cross-section results were normalized using a 197Au sample measurement by applying the saturated resonance method. The thermal cross section was measured to be 708 ± 22 b, in agreement with the evaluation in JENDL-5 of 709 b within uncertainties. In the keV region, the evaluated libraries of JENDL-5, ENDF/B-VIII.0 and JEFF-3.3 are in good agreement with the present results over 10 keV but show values lower by 30% to 70% below that energy. Moreover, the results of a resonance shape analysis of the resolved resonance region are also provided in the present paper.

Published
2024
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24. A history of mild shocks experienced by the regolith particles on hydrated asteroid Ryugu

Author

10324609, 30816020, Tomioka, Naotaka, Yamaguchi, Akira, Ito, Motoo, Uesugi, Masayuki, Imae, Naoya, Shirai, Naoki, Ohigashi, Takuji, Kimura, Makoto, Liu, Ming-Chang, Greenwood, Richard C., Uesugi, Kentaro, Nakato, Aiko, Yogata, Kasumi, Yuzawa, Hayato, Kodama, Yu, Hirahara, Kaori, Sakurai, Ikuya, Okada, Ikuo, Karouji, Yuzuru, Okazaki, Keishi, Kurosawa, Kosuke, Noguchi, Takaaki, Miyake, Akira, Miyahara, Masaaki, Seto, Yusuke, Matsumoto, Toru, Igami, Yohei, Nakazawa, Satoru, Okada, Tatsuaki, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Yoshikawa, Makoto, Miyazaki, Akiko, Nishimura, Masahiro, Yada, Toru, Abe, Masanao, Usui, Tomohiro, Watanabe, Sei-ichiro, Tsuda, Yuichi, 10324609, 30816020, Tomioka, Naotaka, Yamaguchi, Akira, Ito, Motoo, Uesugi, Masayuki, Imae, Naoya, Shirai, Naoki, Ohigashi, Takuji, Kimura, Makoto, Liu, Ming-Chang, Greenwood, Richard C., Uesugi, Kentaro, Nakato, Aiko, Yogata, Kasumi, Yuzawa, Hayato, Kodama, Yu, Hirahara, Kaori, Sakurai, Ikuya, Okada, Ikuo, Karouji, Yuzuru, Okazaki, Keishi, Kurosawa, Kosuke, Noguchi, Takaaki, Miyake, Akira, Miyahara, Masaaki, Seto, Yusuke, Matsumoto, Toru, Igami, Yohei, Nakazawa, Satoru, Okada, Tatsuaki, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Yoshikawa, Makoto, Miyazaki, Akiko, Nishimura, Masahiro, Yada, Toru, Abe, Masanao, Usui, Tomohiro, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Abstract

Micrometeorites, a possible major source of Earth’s water, are thought to form from explosive dispersal of hydrated chondritic materials during impact events on their parental asteroids. However, this provenance and formation mechanism have yet to be directly confirmed using asteroid returned samples. Here, we report evidence of mild shock metamorphism in the surface particles of asteroid Ryugu based on electron microscopy. All particles are dominated by phyllosilicates but lack dehydration textures, which are indicative of shock-heating temperatures below ~500 °C. Microfault-like textures associated with extensively shock-deformed framboidal magnetites and a high-pressure polymorph of Fe–Cr–sulfide have been identified. These findings indicate that the average peak pressure was ~2 GPa. The vast majority of ejecta formed during impact on Ryugu-like asteroids would be hydrated materials, larger than a millimetre, originating far from the impact point. These characteristics are inconsistent with current micrometeorite production models, and consequently, a new formation mechanism is required.

Published
2023

25. Neutron Filtering System for Neutron Capture Cross Section Measurement at the ANNRI beamline of MLF/J-PARC

Author

Rovira, Gerard, primary, Kimura, Atsushi, additional, Nakamura, Shoji, additional, Endo, Shunsuke, additional, Iwamoto, Osamu, additional, Iwamoto, Nobuyuki, additional, Katabuchi, Tatsuya, additional, Kodama, Yu, additional, Nakano, Hideto, additional, Hori, Jun-ichi, additional, Shibahara, Yuji, additional, and Kazushi, Terada, additional

Published
2023
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26. Oxygen isotope evidence from Ryugu samples for early water delivery to Earth by CI chondrites

Author

Greenwood, Richard C., primary, Franchi, Ian A., additional, Findlay, Ross, additional, Malley, James A., additional, Ito, Motoo, additional, Yamaguchi, Akira, additional, Kimura, Makoto, additional, Tomioka, Naotaka, additional, Uesugi, Masayuki, additional, Imae, Naoya, additional, Shirai, Naoki, additional, Ohigashi, Takuji, additional, Liu, Ming-Chang, additional, McCain, Kaitlyn A., additional, Matsuda, Nozomi, additional, McKeegan, Kevin D., additional, Uesugi, Kentaro, additional, Nakato, Aiko, additional, Yogata, Kasumi, additional, Yuzawa, Hayato, additional, Kodama, Yu, additional, Tsuchiyama, Akira, additional, Yasutake, Masahiro, additional, Hirahara, Kaori, additional, Tekeuchi, Akihisa, additional, Sekimoto, Shun, additional, Sakurai, Ikuya, additional, Okada, Ikuo, additional, Karouji, Yuzuru, additional, Nakazawa, Satoru, additional, Okada, Tatsuaki, additional, Saiki, Takanao, additional, Tanaka, Satoshi, additional, Terui, Fuyuto, additional, Yoshikawa, Makoto, additional, Miyazaki, Akiko, additional, Nishimura, Masahiro, additional, Yada, Toru, additional, Abe, Masanao, additional, Usui, Tomohiro, additional, Watanabe, Sei-ichiro, additional, and Tsuda, Yuichi, additional

Published
2022
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29. Early fluid activity on Ryugu: perspectives from oxygen, carbon, and 53Mn-53Cr isotopes

Author

McCain, Kaitlyn, primary, Matsuda, Nozomi, additional, Liu, Ming-Chang, additional, McKeegan, Kevin, additional, Yamaguchi, Akira, additional, Kimura, Makoto, additional, Tomioka, Naotaka, additional, Ito, Motoo, additional, Imae, Naoya, additional, Uesugi, Masayuki, additional, Shirai, Naoki, additional, Ohigashi, Takuji, additional, Greenwood, Richard, additional, Uesugi, Kentaro, additional, Nakato, Aiko, additional, Yogata, Kasumi, additional, Yuzawa, Hayato, additional, Kodama, Yu, additional, Hirahara, Kaori, additional, Sakurai, Ikuya, additional, Okada, Ikuo, additional, Karouji, Yuzuru, additional, Nakazawa, Satoru, additional, Okada, Tatsuaki, additional, Saiki, Takanao, additional, Tanaka, Satoshi, additional, Terui, Fuyuto, additional, Yoshikawa, Makoto, additional, Miyazaki, Akiko, additional, Nishimura, Masahiro, additional, Yada, Toru, additional, Abe, Masanao, additional, Usui, Tomohiro, additional, Watanabe, Sei-ichiro, additional, and Tsuda, Yuichi, additional

Published
2022
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33. Incorporation of 16O-rich anhydrous silicates in the protolith of highly hydrated asteroid Ryugu

Author

Liu, Ming-Chang, primary, McCain, Kaitlyn, additional, Matsuda, Nozomi, additional, Yamaguchi, Akira, additional, Kimura, Makoto, additional, Tomioka, Naotaka, additional, Ito, Motoo, additional, Uesugi, Masayuki, additional, Imae, Naoya, additional, Shirai, Naoki, additional, Ohigashi, Takuji, additional, Greenwood, Richard, additional, Uesugi, Kentaro, additional, Nakato, Aiko, additional, Yogata, Kasumi, additional, Yuzawa, Hayato, additional, Kodama, Yu, additional, Hirahara, Kaori, additional, Sakurai, Ikuya, additional, Okada, Ikuo, additional, Karouji, Yuzuru, additional, Nakazawa, Satoru, additional, Okada, Tatsuaki, additional, Saiki, Takanao, additional, Tanaka, Satoshi, additional, Terui, Fuyuto, additional, Yoshikawa, Makoto, additional, Miyazaki, Akiko, additional, Nishimura, Masahiro, additional, Yada, Toru, additional, Abe, Masanao, additional, Usui, Tomohiro, additional, Watanabe, Sei-ichiro, additional, and Tsuda, Yuichi, additional

Published
2022
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34. Hayabusa2 returned samples: A unique and pristine record of outer Solar System materials from asteroid Ryugu

Author

Ito, Motoo, primary, Tomioka, Naotaka, additional, Uesugi, Masayuki, additional, Yamaguchi, Akira, additional, Shirai, Naoki, additional, Ohigashi, Takuji, additional, Liu, Ming-Chang, additional, Greenwood, Richard, additional, Kimura, Makoto, additional, Imae, Naoya, additional, Uesugi, Kentaro, additional, Nakato, Aiko, additional, Yogata, Kasumi, additional, Yuzawa, Hayato, additional, Kodama, Yu, additional, Tsuchiyama, Akira, additional, Yasutake, Masahiro, additional, Findlay, Ross, additional, Franchi, Ian, additional, Malley, James, additional, McCain, Kaitlyn, additional, Matsuda, Nozomi, additional, McKeegan, Kevin, additional, Hirahara, Kaori, additional, Takeuchi, Akihisa, additional, Sekimoto, Shun, additional, Sakurai, Ikuya, additional, Okada, Ikuo, additional, Karouji, Yuzuru, additional, Arakawa, Masahiko, additional, Fujii, Atsushi, additional, Fujimoto, Masaki, additional, Hayakawa, Masahiko, additional, Hirata, Naoyuki, additional, Hirata, Naru, additional, Honda, Rie, additional, Honda, Chikatoshi, additional, Hosoda, Satoshi, additional, Iijima, Yu-ichi, additional, Ikeda, Hitoshi, additional, Ishiguro, Masateru, additional, Ishihara, Yoshiaki, additional, Iwata, Takahiro, additional, Kawahara, Kosuke, additional, Kikuchi, Shota, additional, Kitazato, Kohei, additional, Matsumoto, Koji, additional, Matsuoka, Moe, additional, Michikami, Tatsuhiro, additional, Mimasu, Yuya, additional, Miura, Akira, additional, Mori, Osamu, additional, Morota, Tmokatsu, additional, Nakazawa, Satoru, additional, Namiki, Noriyuki, additional, Noda, Hirotomo, additional, Noguchi, Rina, additional, Ogawa, Naoko, additional, Ogawa, Kazunori, additional, Okada, Tatsuaki, additional, Okamoto, Chisato, additional, Ono, Go, additional, Ozaki, Masanobu, additional, Saiki, Takanao, additional, Sakatani, Naoya, additional, Sawada, Hirotaka, additional, Senshu, Hiroki, additional, Shimaki, Yuri, additional, Shirai, Kei, additional, Sugita, Seiji, additional, Takei, Yuto, additional, Takeuchi, Hiroshi, additional, Tanaka, Satoshi, additional, Tatsumi, Eri, additional, Terui, Fuyuto, additional, Tsukizaki, Ryudo, additional, Wada, Koji, additional, Yamada, Manabu, additional, Yamada, Tetsuya, additional, Yamamoto, Yukio, additional, Yano, Hajime, additional, Yokota, Yasuhiro, additional, Yoshihara, Keisuke, additional, Yoshikawa, Makoto, additional, Yoshikawa, Kent, additional, Fukai, Ryota, additional, Furuya, Shizuho, additional, Hatakeda, Kentaro, additional, Hayashi, Tasuku, additional, Hitomi, Yuya, additional, Kumagai, Kazuya, additional, Miyazaki, Akiko, additional, Nishimura, Masahiro, additional, Soejima, Hiromichi, additional, Iwamae, Ayako, additional, Yamamoto, Daiki, additional, Yoshitake, Miwa, additional, Yada, Toru, additional, Abe, Masanao, additional, Usui, Tomohiro, additional, Watanabe, Sei-ichiro, additional, and Tsuda, Yuichi, additional

Published
2022
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35. Incidence and Risk Factors of Immediate Hypersensitivity Reactions and Immunisation Stress-related Responses with COVID-19 mRNA Vaccine

Author

Imai, Kazuo, primary, Tanaka, Fumika, additional, Kawano, Shuichi, additional, Esaki, Kotoba, additional, Arakawa, Junko, additional, Nishiyama, Takashi, additional, Seno, Soichiro, additional, Hatanaka, Kosuke, additional, Sugiura, Takao, additional, Kodama, Yu, additional, Yamada, Seigo, additional, Iwamoto, Shinichiro, additional, Takesima, Shigeto, additional, Abe, Nobujiro, additional, Kamae, Chikako, additional, Aono, Shigeaki, additional, Ito, Toshimitsu, additional, Yamamoto, Tetsuo, additional, and Mizuguchi, Yasunori, additional

Published
2022
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37. KeV-neutron capture cross-section measurement of 197Au with a Cr-filtered neutron beam at the ANNRI beamline of MLF/J-PARC

Author

Rovira, Gerard, primary, Kimura, Atsushi, additional, Nakamura, Shoji, additional, Endo, Shunsuke, additional, Iwamoto, Osamu, additional, Iwamoto, Nobuyuki, additional, Katabuchi, Tatsuya, additional, Kodama, Yu, additional, Nakano, Hideto, additional, Sato, Yaoki, additional, Hori, Jun-ichi, additional, Shibahara, Yuji, additional, and Terada, Kazushi, additional

Published
2021
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39. Neutron Capture Cross Section Measurement and Resonance Analysis of 107Pd Using ANNRI at MLF/J-PARC.

Author

Nakano, Hideto, Katabuchi, Tatsuya, Terada, Kazushi, Kimura, Atsushi, Nakamura, Shoji, Endo, Shunsuke, Rovira, Gerard, and Kodama, Yu

Subjects
NUCLEAR cross sections, NEUTRON capture, RESONANCE, PARTICLE accelerators, NUCLEAR reactions
Abstract

The neutron capture cross sections of 107Pd were measured using the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) at the Japan Proton Accelerator Research Complex (J-PARC). Capture γ-rays were detected with a NaI(Tl) spectrometer. The incident neutron energy was determined by the time-of-flight method. The preliminary cross section was derived from thermal to resonance energy region. In the resonance region, resonance parameters were derived by resonance analysis using REFIT code. The resonance parameter was close to the value of JENDL-4.0. [ABSTRACT FROM AUTHOR]

Published
2023
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40. 241Am Neutron Capture Cross Section in the keV region using Si and Fe-filtered neutron beams

Author

Rovira, Gerard, Kimura, Atsushi, Nakamura, Shoji, Endo, Shunsuke, Iwamoto, Osamu, Iwamoto, Nobuyuki, Katabuchi, Tatsuya, Kodama, Yu, and Nakano, Hideto

Abstract

ABSTRACTThe neutron capture cross-section of 241Am was measured in the keV neutron range using the recently implemented neutron filtering system of the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) beamline in the materials and life science (MLF) facility of the Japan Proton Accelerator Research Complex (J-PARC). Filter arrays consisting of 20 cm of natFe and natSi were employed in separate measurements to provide filtered neutron beams with averaged neutron energies of 23.5 (Fe), 51.5 and 127.7 (Si) keV. The present 241Am results were obtained relative to the 197Au neutron capture yield by applying the total energy detection principle together with the pulse-height weighting technique. The 241Am neutron capture cross-section was determined as 2.72(29) b at 23.5 keV, 2.14(26) b at 51.5 keV and 1.32(10) b at 127.7 keV with total uncertainties in the range of 8 to 12%, much lower in comparison to the latest time-of-flight experimental data available.

Published
2023
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45. Elucidation of impact event recorded in the lherzolitic shergottite NWA 7397

Author

Yoshida, Masashi, primary, Miyahara, Masaaki, additional, Suga, Hiroki, additional, Yamaguchi, Akira, additional, Tomioka, Naotaka, additional, Sakai, Takeshi, additional, Ohfuji, Hiroaki, additional, Maeda, Fumiya, additional, Ohira, Itaru, additional, Ohtani, Eiji, additional, Kamada, Seiji, additional, Ohigashi, Takuji, additional, Inagaki, Yuichi, additional, Kodama, Yu, additional, and Hirao, Naohisa, additional

Published
2021
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47. Measurements of the neutron capture cross section of 243Am around 23.5 keV

Author

Kodama, Yu, primary, Katabuchi, Tatsuya, additional, Rovira, Gerard, additional, Kimura, Atsushi, additional, Nakamura, Shoji, additional, Endo, Shunsuke, additional, Iwamoto, Nobuyuki, additional, Iwamoto, Osamu, additional, Hori, Jun-ichi, additional, Shibahara, Yuji, additional, Terada, Kazushi, additional, Nakano, Hideto, additional, and Sato, Yaoki, additional

Published
2021
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49. Poirierite, a dense metastable polymorph of magnesium iron silicate in shocked meteorites

Author

40303599, Tomioka, Naotaka, Bindi, Luca, Okuchi, Takuo, Miyahara, Masaaki, Iitaka, Toshiaki, Li, Zhi, Kawatsu, Tsutomu, Xie, Xiande, Purevjav, Narangoo, Tani, Riho, Kodama, Yu, 40303599, Tomioka, Naotaka, Bindi, Luca, Okuchi, Takuo, Miyahara, Masaaki, Iitaka, Toshiaki, Li, Zhi, Kawatsu, Tsutomu, Xie, Xiande, Purevjav, Narangoo, Tani, Riho, and Kodama, Yu

Abstract

A dense magnesium iron silicate polymorph with a structure intermediate between olivine, ringwoodite, and wadsleyite was theoretically predicted about four decades ago. As this group of minerals constitute the major component of shocked meteorites, constraining their transitional forms and behaviour is of potential importance for understanding impact events on their parent bodies. Here we use high-resolution transmission electron microscopy techniques and single-crystal X-ray diffraction analyses to identify naturally occurring examples of this mineral – recently named poirierite – in shocked chondritic meteorites. We observe nanoscale lamellar poirierite topotactically intergrown within wadsleyite, and additionally within ringwoodite as recently reported. Our results confirm the intermediate structure of poirierite and suggest it might be a relay point in the shear transformations between its polymorphs. We propose that poirierite formed during rapid decompression at relatively low temperature in retrograde shock metamorphism of the meteorites.

Published
2021

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