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Title	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
Author(s)	Aguilar, M (Madrid, CIEMAT) ; Ali Cavasonza, L (JARA, Aachen) ; Alpat, B (INFN, Perugia) ; Ambrosi, G (INFN, Perugia) ; Arruda, L (LIP, Lisbon) ; Attig, N (Julich, NIC ; Unlisted, DE) ; Aupetit, S (LPSC, Grenoble) ; Azzarello, P (Geneva U.) ; Bachlechner, A (JARA, Aachen) ; Barao, F (LIP, Lisbon) ; Barrau, A (LPSC, Grenoble) ; Barrin, L (CERN) ; Bartoloni, A (INFN, Rome) ; Basara, L (INFN, Trento) ; Başeǧmez-du Pree, S (Beijing, Inst. High Energy Phys.) ; Battarbee, M (Turku U.) ; Battiston, R (TIFPA-INFN, Trento ; Trento U.) ; Bazo, J (INFN Perugia ; Lima, Pont. U. Catolica) ; Becker, U (MIT) ; Behlmann, M (MIT) ; Beischer, B (JARA, Aachen) ; Berdugo, J (Madrid, CIEMAT) ; Bertucci, B (INFN, Perugia ; Perugia U.) ; Bindi, V (Hawaii U.) ; Boella, G (INFN, Milan Bicocca ; Milan Bicocca U.) ; de Boer, W (KIT, Karlsruhe, EKP) ; Bollweg, K (NASA, Houston ; Unlisted, US) ; Bonnivard, V (LPSC, Grenoble) ; Borgia, B (INFN, Rome ; U. Rome La Sapienza (main)) ; Boschini, M  J (INFN, Milan Bicocca ; Unlisted, IT) ; Bourquin, M (Geneva U.) ; Bueno, E  F (Sao Paulo U., Sao Carlos) ; Burger, J (MIT) ; Cadoux, F (Annecy, LAPP) ; Cai, X  D (World Lab., Geneva) ; Capell, M (MIT) ; Caroff, S (Annecy, LAPP ; Savoie U. (main)) ; Casaus, J (Madrid, CIEMAT) ; Castellini, G (IFAC, Florence) ; Cernuda, I (Madrid, CIEMAT) ; Cervelli, F (INFN, Pisa) ; Chae, M  J (Ewha Women's U., Seoul) ; Chang, Y  H (Taiwan, Natl. Central U.) ; Chen, A  I (MIT) ; Chen, G  M (Beijing, Inst. High Energy Phys.) ; Chen, H  S (Columbia U.) ; Cheng, L (Shandong U.) ; Chou, H  Y (Taiwan, Natl. Central U.) ; Choumilov, E (MIT) ; Choutko, V (MIT) ; Chung, C  H (JARA, Aachen) ; Clark, C (Maryland U. ; Maryland U., Dept. Chem.) ; Clavero, R (IAC, La Laguna) ; Coignet, G (Annecy, LAPP ; Savoie U.) ; Consolandi, C (Hawaii U.) ; Contin, A (INFN, Bologna ; U. Bologna (main)) ; Corti, C (Hawaii U.) ; Coste, B (INFN, Trento ; Trento U.) ; Creus, W (Zurich U.) ; Crispoltoni, M (INFN, Perugia ; Perugia U.) ; Cui, Z (Shandong U.) ; Dai, Y  M (Inst. Electr. Engin., Beijing) ; Delgado, C (Madrid, CIEMAT) ; Della Torre, S (INFN, Milan Bicocca) ; Demirköz, M  B (Middle East Tech. U., Ankara) ; Derome, L (LPSC, Grenoble) ; Di Falco, S (INFN, Pisa) ; Dimiccoli, F (Trento U.) ; Díaz, C (Madrid, CIEMAT) ; von Doetinchem, P (Hawaii U.) ; Dong, F (Princeton U. Observ.) ; Donnini, F (INFN, Perugia ; U. Perugia (main)) ; Duranti, M (INFN, Perugia ; Perugia U.) ; D'Urso, D (INFN, Perugia ; BeppoSAX, Rome) ; Egorov, A (MIT) ; Eline, A (MIT) ; Eronen, T (Turku U.) ; Feng, J (Annecy, LAPP) ; Fiandrini, E (INFN, Perugia ; U. Perugia) ; Finch, E (Yale U.) ; Fisher, P (MIT, LNS) ; Formato, V (INFN, Trieste) ; Galaktionov, Y (MIT) ; Gallucci, G (CERN ; INFN, Pisa) ; García, B (Buenos Aires, CONICET) ; García-López, R  J (IAC, La Laguna ; Laguna U., Tenerife) ; Gargiulo, C (CERN) ; Gast, H (Aachen, Tech. Hochsch.) ; Gebauer, I (Karlsruhe, Forschungszentrum) ; Gervasi, M (INFN, Milan Bicocca ; Milan Bicocca U.) ; Ghelfi, A (LPSC, Grenoble) ; Giovacchini, F (Madrid, CIEMAT) ; Goglov, P (MIT) ; Gómez-Coral, D  M (Mexico U.) ; Gong, J (Southeast U., Nanjing) ; Goy, C (Annecy, LAPP ; Savoie U.) ; Grabski, V (Mexico U.) ; Grandi, D (INFN, Milan Bicocca) ; Graziani, M (INFN, Perugia ; U. Perugia (main)) ; Guerri, I (INFN, Pisa ; U. Pisa (main)) ; Guo, K  H (Zhongshan U.) ; Habiby, M (Geneva U.) ; Haino, S (Academia Sinica, Taiwan) ; Han, K  C (CSIST, Taiwan) ; He, Z  H (Zhongshan U.) ; Heil, M (MIT) ; Hoffman, J (Notre Dame U.) ; Hsieh, T  H (Santa Barbara, KITP) ; Huang, H (Brookhaven) ; Huang, Z  C (Zhongshan U.) ; Huh, C (CHEP, Taegu ; Kyungpook Natl. U., Daegu (Main)) ; Incagli, M (INFN, Pisa) ; Ionica, M (Bucharest, Inst. Microtech.) ; Jang, W  Y (CHEP, Taegu ; Kyungpook Natl. U., Daegu (Main)) ; Jinchi, H (CSIST, Taiwan) ; Kang, S  C (Kyungpook Natl. U.) ; Kanishev, K (INFN, Trento ; Trento U.) ; Kim, G  N (CHEP, Taegu ; Kyungpook Natl. U., Daegu (Main)) ; Kim, K  S (Hanyang U.) ; Kirn, Th (Aachen, Tech. Hochsch.) ; Konak, C (Middle East Tech. U., Ankara) ; Kounina, O (MIT) ; Kounine, A (MIT) ; Koutsenko, V (MIT) ; Krafczyk, M  S (MIT) ; La Vacca, G (INFN, Milan Bicocca ; Milan Bicocca U.) ; Laudi, E (INFN, Perugia ; U. Perugia) ; Laurenti, G (INFN, Bologna ; U. Bologna) ; Lazzizzera, I (INFN, Trento ; Trento U.) ; Lebedev, A (Brookhaven) ; Lee, H  T (Taiwan, Inst. Phys.) ; Lee, S  C (Iowa State U.) ; Leluc, C (Geneva U.) ; Li, H  S (Colorado U.) ; Li, J  Q (Peking U., Beijing) ; Li, Q (Huzhou Teachers Coll.) ; Li, T  X (Zhongshan U.) ; Li, W (Beijing, Inst. High Energy Phys. ; Ohio State U., CCAPP) ; Li, Z  H (Beijing, Inst. High Energy Phys.) ; Li, Z  Y (Hua-Zhong Normal U. ; Hua-Zhong Normal U., LQLP) ; Lim, S (Ewha Women's U., Seoul) ; Lin, C  H (Taiwan, Inst. Phys.) ; Lipari, P (Rome U.) ; Lippert, T (Julich, NIC ; Unlisted, DE) ; Liu, D (CUST, SKLPDE ; Hefei, CUST) ; Liu, Hu (Bohr Inst.) ; Lu, S  Q (Taiwan, Inst. Phys.) ; Lu, Y  S (Beijing, Inst. High Energy Phys.) ; Luebelsmeyer, K (JARA, Aachen) ; Luo, F (Shandong U.) ; Luo, J  Z (Southeast U., Nanjing) ; Lv, S  S (Zhongshan U.) ; Majka, R (Yale U.) ; Mañá, C (Madrid, CIEMAT) ; Marín, J (Madrid, CIEMAT) ; Martin, T (UC, San Diego) ; Martínez, G (Madrid, CIEMAT) ; Masi, N (Bologna U. ; INFN, Bologna) ; Maurin, D (LPSC, Grenoble) ; Menchaca-Rocha, A (Mexico U.) ; Meng, Q (Southeast U., Nanjing) ; Mo, D  C (Zhongshan U.) ; Morescalchi, L (INFN, Pisa) ; Mott, P (NASA, Houston ; Unlisted, US) ; Nelson, T (Hawaii U.) ; Ni, J  Q (Zhongshan U.) ; Nikonov, N (KIT, Karlsruhe, EKP) ; Nozzoli, F (INFN, Perugia) ; Nunes, P (LIP, Lisbon) ; Oliva, A (CERN) ; Orcinha, M (LIP, Lisbon) ; Palmonari, F (INFN, Bologna ; U. Bologna) ; Palomares, C (Madrid, CIEMAT) ; Paniccia, M (Geneva U.) ; Pauluzzi, M (INFN, Perugia ; U. Perugia) ; Pensotti, S (INFN, Milan Bicocca ; Milan Bicocca U.) ; Pereira, R (Hawaii U.) ; Picot-Clemente, N (Maryland U.) ; Pilo, F (INFN, Pisa) ; Pizzolotto, C (INFN, Perugia) ; Plyaskin, V (MIT) ; Pohl, M (Iowa State U.) ; Poireau, V (Annecy, LAPP) ; Putze, A (Stockholm U.) ; Quadrani, L (INFN, Bologna ; U. Bologna) ; Qi, X  M (Zhongshan U.) ; Qin, X (INFN, Perugia) ; Qu, Z  Y (Taiwan, Inst. Phys.) ; Räihä, T (JARA, Aachen ; RWTH Aachen U.) ; Rancoita, P  G (INFN, Milan Bicocca) ; Rapin, D (Geneva U.) ; Ricol, J  S (LPSC, Grenoble) ; Rodríguez, I (Madrid, CIEMAT) ; Rosier-Lees, S (Annecy, LAPP) ; Rozhkov, A (MIT) ; Rozza, D (INFN, Milan Bicocca ; Milan Bicocca U.) ; Sagdeev, R (Maryland U., College Park) ; Sandweiss, J (Yale U.) ; Saouter, P (Geneva U.) ; Schael, S (Aachen, Tech. Hochsch. ; JARA, Aachen) ; Schmidt, S  M (Julich, NIC ; Unlisted, DE) ; Schulz von Dratzig, A (Aachen, Tech. Hochsch. ; JARA, Aachen) ; Schwering, G (Aachen, Tech. Hochsch. ; JARA, Aachen) ; Seo, E  S (Maryland U., College Park) ; Shan, B  S (BeiHang U.) ; Shi, J  Y (Southeast U., Nanjing) ; Siedenburg, T (Aachen, Tech. Hochsch. ; JARA, Aachen) ; Son, D (CHEP, Taegu) ; Song, J  W (Shandong U.) ; Sun, W  H (MIT ; Southeast U., Nanjing ; Unlisted, CN) ; Tacconi, M (INFN, Milan Bicocca ; Milan Bicocca U.) ; Tang, X  W (Beijing, Inst. High Energy Phys.) ; Tang, Z  C (Beijing, Inst. High Energy Phys.) ; Tao, L (Annecy, LAPP ; Savoie U.) ; Tescaro, D (IAC, La Laguna) ; Ting, Samuel C  C (MIT ; CERN) ; Ting, S  M (MIT) ; Tomassetti, N (LPSC, Grenoble) ; Torsti, J (Turku U.) ; Türkoğlu, C (TU Vienna ; Vienna, OAW) ; Urban, T (Prague, Tech. U.) ; Vagelli, V (KIT, Karlsruhe, EKP) ; Valente, E (INFN, Rome ; U. Rome La Sapienza (main)) ; Vannini, C (INFN, Pisa) ; Valtonen, E (Turku U.) ; Vázquez Acosta, M (IAC, La Laguna ; Laguna U., Tenerife) ; Vecchi, M (Marseille, CPPM) ; Velasco, M (Northwestern U. (main)) ; Vialle, J  P (Annecy, LAPP ; Savoie U.) ; Vitale, V (INFN, Rome ; Rome U., Tor Vergata) ; Vitillo, S (Geneva U.) ; Wang, L  Q (Shandong U.) ; Wang, N  H (Shandong U.) ; Wang, Q  L (Inst. Electr. Engin., Beijing) ; Wang, X (LBNL, Berkeley) ; Wang, X  Q (Hefei, CUST) ; Wang, Z  X (Zhongshan U.) ; Wei, C  C (Purdue U.) ; Weng, Z  L (MIT) ; Whitman, K (Hawaii U.) ; Wienkenhöver, J (Aachen, Tech. Hochsch. ; JARA, Aachen) ; Willenbrock, M (MIT) ; Wu, H (Nanjing U.) ; Wu, X (Geneva U.) ; Xia, X (Beijing, Inst. High Energy Phys.) ; Xiong, R  Q (Southeast U., Nanjing) ; Xu, W (Beijing, Inst. High Energy Phys. ; MIT) ; Yan, Q (Beijing, Inst. High Energy Phys.) ; Yang, J (Ewha Women's U., Seoul) ; Yang, M (MIT) ; Yang, Y (Hua-Zhong Normal U.) ; Yi, H (Southeast U., Nanjing) ; Yu, Y  J (Inst. Electr. Engin., Beijing) ; Yu, Z  Q (Nankai, CIM) ; Zeissler, S (KIT, Karlsruhe, EKP) ; Zhang, C (South Dakota U.) ; Zhang, J (Jefferson Lab) ; Zhang, J  H (Southeast U., Nanjing) ; Zhang, S  D (MIT) ; Zhang, S  W (Beijing, Inst. High Energy Phys.) ; Zhang, Z (EGO, Pisa) ; Zheng, Z  M (BeiHang U.) ; Zhu, Z  Q (Beijing, Inst. High Energy Phys.) ; Zhuang, H  L (Serpukhov, IHEP) ; Zhukov, V (Aachen, Tech. Hochsch.) ; Zichichi, A (Bologna U. ; Enrico Fermi Ctr., Rome ; INFN, Bologna) ; Zimmermann, N (Aachen, Tech. Hochsch. ; JARA, Aachen) ; Zuccon, P (MIT)
Collaboration	AMS
Publication	2016
Number of pages	8
In:	Phys. Rev. Lett. 117 (2016) 231102
DOI	10.1103/PhysRevLett.117.231102
Subject category	Astrophysics and Astronomy
Accelerator/Facility, Experiment	AMS 02
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.
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