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Title Precision Measurement of the Helium Flux in Primary Cosmic Rays of Rigidities 1.9 GV to 3 TV with the Alpha Magnetic Spectrometer on the International Space Station
Author(s)

Aguilar, M (Madrid, CIEMAT) ; Aisa, D (INFN, Perugia ; Perugia U.) ; Alpat, B (INFN, Perugia) ; Alvino, A (INFN, Perugia) ; Ambrosi, G (INFN, Perugia) ; Andeen, K (Karlsruhe U., EKP) ; Arruda, L (Lisbon, LIFEP) ; Attig, N (Julich, NIC) ; Azzarello, P (Geneva U.) ; Bachlechner, A (Aachen, Tech. Hochsch.) ; Barao, F (Lisbon, LIFEP) ; Barrau, A (LPSC, Grenoble) ; Barrin, L (CERN) ; Bartoloni, A (INFN, Rome) ; Basara, L (INFN, Rome3) ; Battarbee, M (Turku U.) ; Battiston, R (INFN, Rome3 ; Trento U.) ; Bazo, J (INFN, Perugia) ; Becker, U (MIT) ; Behlmann, M (MIT) ; Beischer, B (Aachen, Tech. Hochsch.) ; Berdugo, J (Madrid, CIEMAT) ; Bertucci, B (INFN, Perugia ; Perugia U.) ; Bindi, V (Hawaii U.) ; Bizzaglia, S (INFN, Perugia) ; Bizzarri, M (INFN, Perugia ; Perugia U.) ; Boella, G (INFN, Milan Bicocca ; Milan U.) ; De Boer, W (Karlsruhe U., EKP) ; Bollweg, K (NASA, Houston) ; Bonnivard, V (LPSC, Grenoble) ; Borgia, B (INFN, Rome ; Rome U.) ; Borsini, S (INFN, Perugia) ; Boschini, M J (INFN, Milan Bicocca) ; Bourquin, M (Geneva U.) ; Burger, J (MIT) ; Cadoux, F (Geneva U.) ; Cai, X D (MIT) ; Capell, M (MIT) ; Caroff, S (Annecy, LAPP ; Savoie U.) ; Casaus, J (Madrid, CIEMAT) ; Castellini, G (Florence, IROE) ; Cernuda, I (Madrid, CIEMAT) ; Cerreta, D (INFN, Perugia ; Perugia U.) ; 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 (MIT) ; Chen, H S (Beijing, Inst. High Energy Phys.) ; Cheng, L (Shandong U.) ; Chou, H Y (Taiwan, Natl. Central U.) ; Choumilov, E (MIT) ; Choutko, V (MIT) ; Chung, C H (Aachen, Tech. Hochsch.) ; Clark, C (NASA, Houston) ; Clavero, R (IAC, La Laguna) ; Coignet, G (Annecy, LAPP ; Savoie U.) ; Consolandi, C (Hawaii U.) ; Contin, A (INFN, Bologna ; Bologna U.) ; Corti, C (Hawaii U.) ; Cortina Gil, E (Geneva U.) ; Coste, B (INFN, Rome3 ; CERN) ; Creus, W (Taiwan, Natl. Central 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) ; Demirkoz, M B (Middle East Tech. U., Ankara) ; Derome, L (LPSC, Grenoble) ; Di Falco, S (INFN, Pisa) ; Di Masso, L (INFN, Perugia ; Perugia U.) ; Dimiccoli, F (INFN, Rome3 ; Trento U.) ; Diaz, C (Madrid, CIEMAT) ; von Doetinchem, P (Hawaii U.) ; Donnini, F (INFN, Perugia ; Perugia U.) ; Duranti, M (INFN, Perugia ; Perugia U.) ; D'Urso, D (INFN, Perugia) ; Egorov, A (MIT) ; Eline, A (MIT) ; Eppling, F J (MIT) ; Eronen, T (Turku U.) ; Fan, Y Y (Taiwan, Inst. Phys.) ; Farnesini, L (INFN, Perugia) ; Feng, J (Annecy, LAPP ; Savoie U. ; Taiwan, Inst. Phys.) ; Fiandrini, E (INFN, Perugia ; Perugia U.) ; Fiasson, A (Annecy, LAPP ; Savoie U.) ; Finch, E (Yale U.) ; Fisher, P (MIT) ; Formato, V (INFN, Perugia ; CERN) ; Galaktionov, Y (MIT) ; Gallucci, G (INFN, Pisa) ; Garcia, B (Madrid, CIEMAT) ; Garcia-Lopez, R (IAC, La Laguna) ; Gargiulo, C (CERN) ; Gast, H (Aachen, Tech. Hochsch.) ; Gebauer, I (Karlsruhe U., EKP) ; Gervasi, M (INFN, Milan Bicocca ; Milan U.) ; Ghelfi, A (LPSC, Grenoble) ; Giovacchini, F (Madrid, CIEMAT) ; Goglov, P (MIT) ; Gong, J (Southeast U., Nanjing) ; Goy, C (Annecy, LAPP ; Savoie U.) ; Grabski, V (Mexico U.) ; Grandi, D (INFN, Milan Bicocca) ; Graziani, M (INFN, Perugia ; Perugia U.) ; Guandalini, C (INFN, Bologna) ; Guerri, I (INFN, Pisa ; Pisa U.) ; Guo, K H (Zhongshan U.) ; Haas, D (Geneva U.) ; Habiby, M (Geneva U.) ; Haino, S (Taiwan, Inst. Phys.) ; Han, K C (CSIST, Taiwan) ; He, Z H (Zhongshan U.) ; Heil, M (MIT) ; Hoffman, J (Taiwan, Natl. Central U. ; Hawaii U.) ; Hsieh, T H (MIT) ; Huang, Z C (Zhongshan U.) ; Huh, C (Kyungpook Natl. U.) ; Incagli, M (INFN, Pisa) ; Ionica, M (INFN, Perugia) ; Jang, W Y (Kyungpook Natl. U.) ; Jinchi, H (CSIST, Taiwan) ; Kanishev, K (INFN, Rome3 ; Trento U. ; CERN) ; Kim, G N (Kyungpook Natl. U.) ; Kim, K S (Kyungpook Natl. U.) ; Kirn, Th (Aachen, Tech. Hochsch.) ; Korkmaz, M A (Middle East Tech. U., Ankara) ; Kossakowski, R (Annecy, LAPP ; Savoie U.) ; Kounina, O (MIT) ; Kounine, A (MIT) ; Koutsenko, V (MIT) ; Krafczyk, M S (MIT) ; La Vacca, G (INFN, Milan Bicocca) ; Laudi, E (INFN, Perugia ; Perugia U.) ; Laurenti, G (INFN, Bologna) ; Lazzizzera, I (INFN, Rome3 ; Trento U.) ; Lebedev, A (MIT) ; Lee, H T (Taipei, Computing Ctr.) ; Lee, S C (Taiwan, Inst. Phys.) ; Leluc, C (Geneva U.) ; Li, H L (Taiwan, Inst. Phys.) ; Li, J Q (MIT) ; Li, J Q (Southeast U., Nanjing) ; Li, Q (Southeast U., Nanjing) ; Li, Q (MIT) ; Li, T X (Zhongshan U.) ; Li, W (BeiHang U.) ; Li, Y (Geneva U.) ; Li, Z H (Beijing, Inst. High Energy Phys.) ; Li, Z Y (Taiwan, Inst. Phys.) ; Lim, S (Kyungpook Natl. U.) ; Lin, C H (Taiwan, Inst. Phys.) ; Lipari, P (INFN, Rome) ; Lippert, T (Julich, NIC) ; Liu, D (Taiwan, Inst. Phys.) ; Liu, H (Southeast U., Nanjing) ; Liu, Hu (Madrid, CIEMAT) ; Lolli, M (INFN, Bologna) ; Lomtadze, T (INFN, Pisa) ; Lu, M J (INFN, Rome3) ; Lu, S Q (Taiwan, Inst. Phys.) ; Lu, Y S (Beijing, Inst. High Energy Phys.) ; Luebelsmeyer, K (Aachen, Tech. Hochsch.) ; Luo, F (Shandong U.) ; Luo, J Z (Southeast U., Nanjing) ; Lv, S S (Zhongshan U.) ; Majka, R (Yale U.) ; Mana, C (Madrid, CIEMAT) ; Marin, J (Madrid, CIEMAT) ; Martin, T (NASA, Houston) ; Martinez, G (Madrid, CIEMAT) ; Masi, N (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) ; Muller, M (Aachen, Tech. Hochsch.) ; Nelson, T (Hawaii U.) ; Ni, J Q (Zhongshan U.) ; Nikonov, N (Karlsruhe U., EKP) ; Nozzoli, F (INFN, Perugia) ; Nunes, P (Lisbon, LIFEP) ; Obermeier, A (Aachen, Tech. Hochsch.) ; Oliva, A (Madrid, CIEMAT) ; Orcinha, M (Lisbon, LIFEP) ; Palmonari, F (INFN, Bologna ; Bologna U.) ; Palomares, C (Madrid, CIEMAT) ; Paniccia, M (Geneva U.) ; Papi, A (INFN, Perugia) ; Pauluzzi, M (INFN, Perugia ; Perugia U.) ; Pedreschi, E (INFN, Pisa) ; Pensotti, S (INFN, Milan Bicocca ; Milan U.) ; Pereira, R (Hawaii U.) ; Picot-Clemente, N (Maryland U.) ; Pilo, F (INFN, Pisa) ; Piluso, A (INFN, Perugia ; Perugia U.) ; Pizzolotto, C (INFN, Perugia) ; Plyaskin, V (MIT) ; Pohl, M (Geneva U.) ; Poireau, V (Annecy, LAPP ; Savoie U.) ; Putze, A (Annecy, LAPP ; Savoie U.) ; Quadrani, L (INFN, Bologna ; Bologna U.) ; Qi, X M (Zhongshan U.) ; Qin, X (INFN, Perugia) ; Qu, Z Y (Taiwan, Inst. Phys.) ; Raiha, T (Aachen, Tech. Hochsch.) ; Rancoita, P G (INFN, Milan Bicocca) ; Rapin, D (Geneva U.) ; Ricol, J S (LPSC, Grenoble) ; Rodriguez, I (Madrid, CIEMAT) ; Rosier-Lees, S (Annecy, LAPP ; Savoie U.) ; Rozhkov, A (MIT) ; Rozza, D (INFN, Milan Bicocca) ; Sagdeev, R (Maryland U.) ; Sandweiss, J (Yale U.) ; Saouter, P (Geneva U.) ; Schael, S (Aachen, Tech. Hochsch.) ; Schmidt, S M (Julich, NIC) ; Schulz von Dratzig, A (Aachen, Tech. Hochsch.) ; Schwering, G (Aachen, Tech. Hochsch.) ; Scolieri, G (INFN, Perugia) ; Seo, E S (Maryland U.) ; Shan, B S (BeiHang U.) ; Shan, Y H (BeiHang U.) ; Shi, J Y (Southeast U., Nanjing) ; Shi, X Y (MIT) ; Shi, Y M (Shanghai Jiaotong U.) ; Siedenburg, T (Aachen, Tech. Hochsch.) ; Son, D (Kyungpook Natl. U.) ; Song, J W (Shandong U.) ; Spada, F (INFN, Rome) ; Spinella, F (INFN, Pisa) ; Sun, W (MIT) ; Sun, W H (MIT) ; Tacconi, M (INFN, Milan Bicocca ; CERN) ; Tang, C P (Zhongshan 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) ; Ting, S M (MIT) ; Tomassetti, N (LPSC, Grenoble) ; Torsti, J (Turku U.) ; C Turko\capitalbreve g (Middle East Tech. U., Ankara) ; Urban, T (NASA, Houston) ; Vagelli, V (Karlsruhe U., EKP ; INFN, Perugia) ; Valente, E (INFN, Rome ; Rome U.) ; Vannini, C (INFN, Pisa) ; Valtonen, E (Turku U.) ; Vaurynovich, S (MIT) ; Vecchi, M (Sao Paulo U.) ; Velasco, M (Madrid, CIEMAT) ; Vialle, J P (Annecy, LAPP ; Savoie U.) ; Vitale, V (INFN, Perugia) ; Vitillo, S (Geneva U.) ; Wang, L Q (Shandong U.) ; Wang, N H (Shandong U.) ; Wang, Q L (Inst. Electr. Engin., Beijing) ; Wang, R S (Shanghai Jiaotong U.) ; Wang, X (MIT) ; Wang, Z X (Zhongshan U.) ; Weng, Z L (MIT) ; Whitman, K (Hawaii U.) ; Wienkenhover, J (Aachen, Tech. Hochsch.) ; Willenbrock, M (MIT) ; Wu, H (Southeast U., Nanjing) ; Wu, X (Geneva U.) ; Xia, X (Madrid, CIEMAT) ; Xie, M (MIT) ; Xie, S (Shanghai Jiaotong U.) ; Xiong, R Q (Southeast U., Nanjing) ; Xu, N S (Zhongshan U.) ; Xu, W (MIT) ; Yan, Q (MIT) ; Yang, J (Ewha Women's U., Seoul) ; Yang, M (Beijing, Inst. High Energy Phys.) ; Yang, Y (Taiwan, Natl. Cheng Kung U.) ; Ye, Q H (Shanghai Jiaotong U.) ; Yi, H (Southeast U., Nanjing) ; Yu, Y J (Inst. Electr. Engin., Beijing) ; Yu, Z Q (Beijing, Inst. High Energy Phys.) ; Zeissler, S (Karlsruhe U., EKP) ; Zhang, C (Beijing, Inst. High Energy Phys.) ; Zhang, J H (Southeast U., Nanjing) ; Zhang, M T (Zhongshan U.) ; Zhang, S D (MIT) ; Zhang, S W (Beijing, Inst. High Energy Phys.) ; Zhang, X B (Zhongshan U.) ; Zhang, Z (Zhongshan U.) ; Zheng, Z M (BeiHang U.) ; Zhuang, H L (Beijing, Inst. High Energy Phys.) ; Zhukov, V (Aachen, Tech. Hochsch.) ; Zichichi, A (INFN, Bologna ; Bologna U.) ; Zimmermann, N (Aachen, Tech. Hochsch.) ; Zuccon, P (MIT)

Publication 2015
Number of pages 9
In: Phys. Rev. Lett. 115 (2015) 211101
DOI 10.1103/PhysRevLett.115.211101
Subject category Astrophysics and Astronomy
Accelerator/Facility, Experiment AMS RE1
Abstract Knowledge of the precise rigidity dependence of the helium flux is important in understanding the origin, acceleration, and propagation of cosmic rays. A precise measurement of the helium flux in primary cosmic rays with rigidity (momentum/charge) from 1.9 GV to 3 TV based on 50 million events is presented and compared to the proton flux. The detailed variation with rigidity of the helium flux spectral index is presented for the first time. The spectral index progressively hardens at rigidities larger than 100 GV. The rigidity dependence of the helium flux spectral index is similar to that of the proton spectral index though the magnitudes are different. Remarkably, the spectral index of the proton to helium flux ratio increases with rigidity up to 45 GV and then becomes constant; the flux ratio above 45 GV is well described by a single power law.
Copyright/License publication: © 2015-2024 The Author(s) (License: CC-BY-3.0)

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