Knowledge of the rigidity dependence of the boron to carbon flux ratio (B/C) is important in understanding the propagation of cosmic rays. The precise measurement of the B/C ratio from 1.9 GV to 2.6 TV, based on 2.3 million boron and 8.3 million carbon nuclei collected by AMS during the first 5 years of operation, is presented. The detailed variation with rigidity of the B/C spectral index is reported for the first time. The B/C ratio does not show any significant structures in contrast to many cosmic ray models that require such structures at high rigidities. Remarkably, above 65 GV, the B/C ratio is well described by a single power law RΔ with index Δ=-0.333±0.014(fit)±0.005(syst), in good agreement with the Kolmogorov theory of turbulence which predicts Δ=-1/3 asymptotically.

Aguilar, M., Ali Cavasonza, L., Ambrosi, G., Arruda, L., Attig, N., Aupetit, S., et al. (2016). Precision Measurement of the Boron to Carbon Flux Ratio in Cosmic Rays from 1.9 GV to 2.6 TV with the Alpha Magnetic Spectrometer on the International Space Station. PHYSICAL REVIEW LETTERS, 117(23), 1-8 [10.1103/PhysRevLett.117.231102].

Precision Measurement of the Boron to Carbon Flux Ratio in Cosmic Rays from 1.9 GV to 2.6 TV with the Alpha Magnetic Spectrometer on the International Space Station

BOELLA, GIULIANO FILIPPO;GERVASI, MASSIMO;GRANDI, DAVIDE;LA VACCA, GIUSEPPE;PENSOTTI, SIMONETTA;ROZZA, DAVIDE;TACCONI, MAURO;
2016

Abstract

Knowledge of the rigidity dependence of the boron to carbon flux ratio (B/C) is important in understanding the propagation of cosmic rays. The precise measurement of the B/C ratio from 1.9 GV to 2.6 TV, based on 2.3 million boron and 8.3 million carbon nuclei collected by AMS during the first 5 years of operation, is presented. The detailed variation with rigidity of the B/C spectral index is reported for the first time. The B/C ratio does not show any significant structures in contrast to many cosmic ray models that require such structures at high rigidities. Remarkably, above 65 GV, the B/C ratio is well described by a single power law RΔ with index Δ=-0.333±0.014(fit)±0.005(syst), in good agreement with the Kolmogorov theory of turbulence which predicts Δ=-1/3 asymptotically.
Articolo in rivista - Articolo scientifico
Cosmic Rays, Galactic propagation
English
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8
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Aguilar, M., Ali Cavasonza, L., Ambrosi, G., Arruda, L., Attig, N., Aupetit, S., et al. (2016). Precision Measurement of the Boron to Carbon Flux Ratio in Cosmic Rays from 1.9 GV to 2.6 TV with the Alpha Magnetic Spectrometer on the International Space Station. PHYSICAL REVIEW LETTERS, 117(23), 1-8 [10.1103/PhysRevLett.117.231102].
Aguilar, M; Ali Cavasonza, L; Ambrosi, G; Arruda, L; Attig, N; Aupetit, S; Azzarello, P; Bachlechner, A; Barao, F; Barrau, A; Barrin, L; Bartoloni, A; Basara, L; Başeğmez du Pree, S; Battarbee, M; Battiston, R; Becker, U; Behlmann, M; Beischer, B; Berdugo, J; Bertucci, B; Bindel, K; Bindi, V; Boella, G; de Boer, W; Bollweg, K; Bonnivard, V; Borgia, B; Boschini, M; Bourquin, M; Bueno, E; Burger, J; Cadoux, F; Cai, X; Capell, M; Caroff, S; Casaus, J; Castellini, G; Cervelli, F; Chae, M; Chang, Y; Chen, A; Chen, G; Chen, H; Cheng, L; Chou, H; Choumilov, E; Choutko, V; Chung, C; Clark, C; Clavero, R; Coignet, G; Consolandi, C; Contin, A; Corti, C; Creus, W; Crispoltoni, M; Cui, Z; Dai, Y; Delgado, C; Della Torre, S; Demakov, O; Demirköz, M; Derome, L; Di Falco, S; Dimiccoli, F; Díaz, C; von Doetinchem, P; Dong, F; Donnini, F; Duranti, M; D’Urso, D; Egorov, A; Eline, A; Eronen, T; Feng, J; Fiandrini, E; Finch, E; Fisher, P; Formato, V; Galaktionov, Y; Gallucci, G; García, B; García López, R; Gargiulo, C; Gast, H; Gebauer, I; Gervasi, M; Ghelfi, A; Giovacchini, F; Goglov, P; Gómez Coral, D; Gong, J; Goy, C; Grabski, V; Grandi, D; Graziani, M; Guo, K; Haino, S; Han, K; He, Z; Heil, M; Hoffman, J; Hsieh, T; Huang, H; Huang, Z; Huh, C; Incagli, M; Ionica, M; Jang, W; Jinchi, H; Kang, S; Kanishev, K; Kim, G; Kim, K; Kirn, T; Konak, C; Kounina, O; Kounine, A; Koutsenko, V; Krafczyk, M; LA VACCA, G; Laudi, E; Laurenti, G; Lazzizzera, I; Lebedev, A; Lee, H; Lee, S; Leluc, C; Li, H; Li, J; Li, J; Li, Q; Li, T; Li, W; Li, Y; Li, Z; Li, Z; Lim, S; Lin, C; Lipari, P; Lippert, T; Liu, D; Liu, H; Lordello, V; Lu, S; Lu, Y; Luebelsmeyer, K; Luo, F; Luo, J; Lv, S; Machate, F; Majka, R; Mañá, C; Marín, J; Martin, T; Martínez, G; Masi, N; Maurin, D; Menchaca Rocha, A; Meng, Q; Mikuni, V; Mo, D; Morescalchi, L; Mott, P; Nelson, T; Ni, J; Nikonov, N; Nozzoli, F; Oliva, A; Orcinha, M; Palmonari, F; Palomares, C; Paniccia, M; Pauluzzi, M; Pensotti, S; Pereira, R; Picot Clemente, N; Pilo, F; Pizzolotto, C; Plyaskin, V; Pohl, M; Poireau, V; Putze, A; Quadrani, L; Qi, X; Qin, X; Qu, Z; Räihä, T; Rancoita, P; Rapin, D; Ricol, J; Rosier Lees, S; Rozhkov, A; Rozza, D; Sagdeev, R; Sandweiss, J; Saouter, P; Schael, S; Schmidt, S; Schulz von Dratzig, A; Schwering, G; Seo, E; Shan, B; Shi, J; Siedenburg, T; Son, D; Song, J; Sun, W; Tacconi, M; Tang, X; Tang, Z; Tao, L; Tescaro, D; Ting, S; Ting, S; Tomassetti, N; Torsti, J; Türkoğlu, C; Urban, T; Vagelli, V; Valente, E; Vannini, C; Valtonen, E; Vázquez Acosta, M; Vecchi, M; Velasco, M; Vialle, J; Vitale, V; Vitillo, S; Wang, L; Wang, N; Wang, Q; Wang, X; Wang, X; Wang, Z; Wei, C; Weng, Z; Whitman, K; Wienkenhöver, J; Wu, H; Wu, X; Xia, X; Xiong, R; Xu, W; Yan, Q; Yang, J; Yang, M; Yang, Y; Yi, H; Yu, Y; Yu, Z; Zeissler, S; Zhang, C; Zhang, J; Zhang, J; Zhang, S; Zhang, S; Zhang, Z; Zheng, Z; Zhu, Z; Zhuang, H; Zhukov, V; Zichichi, A; Zimmermann, N; Zuccon, P
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