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Aguilar, M; Allen, M S; Alpat, B; Arruda, L; Attig, N; Barao, F; Barrin, L; Bertucci, B; Bollweg, K; Borgia, B; Boschini, M J; Bueno, E F; Burmeister, S; Castellini, G; Chen, G M; Chen, G R; Chung, C H; Clark, C; Consolandi, C; Corti, C; Cui, Z; Dadzie, K; Demirköz, M B; Derome, L; Di Felice, V; von Doetinchem, P; Dong, F; Eline, A; Feng, J; Fisher, P; Freeman, C; Galaktionov, Y; Gámez, C; Giovacchini, F; Gong, J; Goy, C; Grabski, V; Han, K C; Heber, B; Hsieh, T H; Kanishev, K; Khiali, B; Kirn, Th; Konyushikhin, M; Kounina, O; Lee, S C; Li, S; Lippert, T; Liu, J H; Liu, Z; Lu, S Q; Luebelsmeyer, K; Luo, Xi; Machate, F; Martin, T; Martínez, G; Masi, N; Maurin, D; Menchaca-Rocha, A; Meng, Q; Mo, D C; Molero, M; Mussolin, L; Oliva, A; Orcinha, M; Palmonari, F; Paniccia, M; Pashnin, A; Pauluzzi, M; Pensotti, S; Phan, H D; Piandani, R; Conde, A Reina; Rosier-Lees, S; Rozhkov, A; Schael, S; Schulz von Dratzig, A; Seo, E S; Song, J W; Su, T; Sun, Z T; Tang, Z C; Torsti, J; Tüysüz, C; Vagelli, V; Vainio, R; Valente, E; Velasco, M; Wang, Z M; Wei, J; Wu, H; Xiong, R Q; Yashin, I I; Zannoni, M; Zhang, C; Zhang, F; Zheng, C; Zheng, Z M; Zhuang, H L; Zhukov, V
Physical review letters, 2021-Feb-26, Letnik: 126, Številka: 8Journal Article
Precise knowledge of the charge and rigidity dependence of the secondary cosmic ray fluxes and the secondary-to-primary flux ratios is essential in the understanding of cosmic ray propagation. We report the properties of heavy secondary cosmic ray fluorine F in the rigidity R range 2.15 GV to 2.9 TV based on 0.29 million events collected by the Alpha Magnetic Spectrometer experiment on the International Space Station. The fluorine spectrum deviates from a single power law above 200 GV. The heavier secondary-to-primary F/Si flux ratio rigidity dependence is distinctly different from the lighter B/O (or B/C) rigidity dependence. In particular, above 10 GV, the F/Si/B/O ratio can be described by a power law R^{δ} with δ=0.052±0.007. This shows that the propagation properties of heavy cosmic rays, from F to Si, are different from those of light cosmic rays, from He to O, and that the secondary cosmic rays have two classes.
