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Ninomiya, Kazuhiko*; Osawa, Takahito; Terada, Kentaro*; Wada, Taiga*; Nagasawa, Shunsaku*; Chiu, I.-H.; Nakamura, Tomoki*; 40 of others*
Meteoritics & Planetary Science, 59(8), p.2044 - 2057, 2024/08
Times Cited Count:2 Percentile:47.42(Geochemistry & Geophysics)Samples from asteroid Ryugu, brought back by asteroid explorer Hayabusa2 are important for investigating the origin and evolution of the solar system. Here, we report the elemental compositions of a 123 mg Ryugu sample determined with a nondestructive muon elemental analysis method. This method is a powerful tool for determining bulk chemical composition, including light elements such as C, N, and O. From the muonic X-ray spectra with three carbonaceous chondrites, the relationship between the elemental composition and muonic X-ray intensity was determined for each element. Calibration curves showed linearity, and the elemental composition of Ryugu was quantitatively determined. The results reflect the average bulk elemental composition of asteroid Ryugu owing to the large amount of samples. Ryugu has an elemental composition similar to that of Orgueil (CI1), and should be classified as CI1. However, the O/Si ratio of Ryugu is 25% lower than that of Orgueil, indicating that Orgueil may have been seriously contaminated by terrestrial materials after its fall to Earth. These results indicate that the Ryugu sample is more representative than the CI chondrites as a solid material of the solar system.
Okumura, Takuma*; Hashimoto, Tadashi; 40 of others*
Physical Review Letters, 130(17), p.173001_1 - 173001_7, 2023/04
Times Cited Count:11 Percentile:80.53(Physics, Multidisciplinary)Harding, R. D.*; Andreyev, A. N.; Barzakh, A. E.*; Atanasov, D.*; Cubiss, J. G.*; Van Duppen, P.*; 40 of others*
Physical Review C, 102(2), p.024312_1 - 024312_16, 2020/08
Times Cited Count:10 Percentile:68.44(Physics, Nuclear)Adachi, Ichiro*; Tanida, Kiyoshi; Belle Collaboration*; 406 of others*
Physical Review D, 98(11), p.112012_1 - 112012_29, 2018/11
Times Cited Count:18 Percentile:62.29(Astronomy & Astrophysics)Nakagawa, Manami*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Hwang, S.; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; et al.
JPS Conference Proceedings (Internet), 17, p.012009_1 - 012009_4, 2017/07
Miwa, Koji*; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Imai, Kenichi; Kondo, Yasuhiro; Naruki, Megumi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; et al.
JPS Conference Proceedings (Internet), 17, p.041002_1 - 041002_6, 2017/07
Adare, A.*; Hasegawa, Shoichi; Imai, Kenichi; Nagamiya, Shoji; Sako, Hiroyuki; Sato, Susumu; Tanida, Kiyoshi; PHENIX Collaboration*; 440 of others*
Physical Review C, 93(1), p.014904_1 - 014904_34, 2016/01
Times Cited Count:52 Percentile:94.69(Physics, Nuclear)Adare, A.*; Hasegawa, Shoichi; Imai, Kenichi; Nagamiya, Shoji; Sako, Hiroyuki; Sato, Susumu; Tanida, Kiyoshi; PHENIX Collaboration*; 406 of others*
Physical Review D, 93(1), p.011501_1 - 011501_8, 2016/01
Times Cited Count:39 Percentile:82.01(Astronomy & Astrophysics)