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Title	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
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	10
In:	Phys. Rev. Lett. 117 (2016) 091103
DOI	10.1103/PhysRevLett.117.091103
Subject category	Astrophysics and Astronomy
Accelerator/Facility, Experiment	AMS 02
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.
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