A precision measurement by AMS of the antiproton flux and the antiproton-to-proton flux ratio in primary cosmic rays in the absolute rigidity range from 1 to 450 GV is presented based on 3.49×105 antiproton events and 2.42×109 proton events. The fluxes and flux ratios of charged elementary particles in cosmic rays are also presented. In the absolute rigidity range ∼60 to ∼500 GV, the antiproton p, proton p, and positron e+ fluxes are found to have nearly identical rigidity dependence and the electron e- flux exhibits a different rigidity dependence. Below 60 GV, the (p/p), (p/e+), and (p/e+) flux ratios each reaches a maximum. From ∼60 to ∼500 GV, the (p/p), (p/e+), and (p/e+) flux ratios show no rigidity dependence. These are new observations of the properties of elementary particles in the cosmos.

Aguilar, M., Ali Cavasonza, L., Alpat, B., Ambrosi, G., Arruda, L., Attig, N., et al. (2016). Antiproton Flux, Antiproton-to-Proton Flux Ratio, and Properties of Elementary Particle Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station. PHYSICAL REVIEW LETTERS, 117(9) [10.1103/PhysRevLett.117.091103].

Antiproton Flux, Antiproton-to-Proton Flux Ratio, and Properties of Elementary Particle Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station

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

Abstract

A precision measurement by AMS of the antiproton flux and the antiproton-to-proton flux ratio in primary cosmic rays in the absolute rigidity range from 1 to 450 GV is presented based on 3.49×105 antiproton events and 2.42×109 proton events. The fluxes and flux ratios of charged elementary particles in cosmic rays are also presented. In the absolute rigidity range ∼60 to ∼500 GV, the antiproton p, proton p, and positron e+ fluxes are found to have nearly identical rigidity dependence and the electron e- flux exhibits a different rigidity dependence. Below 60 GV, the (p/p), (p/e+), and (p/e+) flux ratios each reaches a maximum. From ∼60 to ∼500 GV, the (p/p), (p/e+), and (p/e+) flux ratios show no rigidity dependence. These are new observations of the properties of elementary particles in the cosmos.
Articolo in rivista - Articolo scientifico
Cosmic Rays, anti-protons
English
9
Aguilar, M., Ali Cavasonza, L., Alpat, B., Ambrosi, G., Arruda, L., Attig, N., et al. (2016). Antiproton Flux, Antiproton-to-Proton Flux Ratio, and Properties of Elementary Particle Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station. PHYSICAL REVIEW LETTERS, 117(9) [10.1103/PhysRevLett.117.091103].
Aguilar, M; Ali Cavasonza, L; Alpat, B; Ambrosi, G; Arruda, L; Attig, N; Aupetit, S; Azzarello, P; Bachlechner, A; Barao, F; Barrau, A; Barrin, L; Bartoloni, A; Basara, L; Başeǧmez du Pree, S; Battarbee, M; Battiston, R; Bazo, J; Becker, U; Behlmann, M; Beischer, B; Berdugo, J; Bertucci, B; 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; Cernuda, I; 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; Coste, B; Creus, W; Crispoltoni, M; Cui, Z; Dai, Y; Delgado, C; Della Torre, S; 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; Guerri, I; Guo, K; Habiby, M; 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, Z; Li, Z; Lim, S; Lin, C; Lipari, P; Lippert, T; Liu, D; Liu, H; Lu, S; Lu, Y; Luebelsmeyer, K; Luo, F; Luo, J; Lv, S; Majka, R; Mañá, C; Marín, J; Martin, T; Martínez, G; Masi, N; Maurin, D; Menchaca Rocha, A; Meng, Q; Mo, D; Morescalchi, L; Mott, P; Nelson, T; Ni, J; Nikonov, N; Nozzoli, F; Nunes, P; 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; Rodríguez, I; 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; Willenbrock, M; 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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