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Title Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer
Author(s)

Aguilar, M (Madrid, CIEMAT) ; Ali Cavasonza, L (Aachen, Tech. Hochsch.) ; Ambrosi, G (INFN, Perugia) ; Arruda, L (LIP, Lisbon) ; Attig, N (IAS, Julich ; JCHP, Julich) ; Bachlechner, A (Aachen, Tech. Hochsch.) ; Barao, F (LIP, Lisbon) ; Barrau, A (LPSC, Grenoble) ; Barrin, L (CERN) ; Bartoloni, A (INFN, Rome) ; Başeğmez-du Pree, S (Groningen, KVI) ; Battiston, R (TIFPA-INFN, Trento ; Trento U.) ; 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.) ; de Boer, W (KIT, Karlsruhe, ETP) ; Bollweg, K (NASA, Houston) ; Borgia, B (INFN, Rome ; U. Rome La Sapienza (main)) ; Boschini, M J (INFN, Milan Bicocca) ; Bourquin, M (Geneva U.) ; Bueno, E F (Groningen, KVI) ; Burger, J (MIT) ; Burger, W J (TIFPA-INFN, Trento) ; Cai, X D (MIT) ; Capell, M (MIT) ; Caroff, S (Annecy, LAPP) ; Casaus, J (Madrid, CIEMAT) ; Castellini, G (INOA, Florence) ; Cervelli, F (INFN, Pisa) ; Chang, Y H (Taiwan, Natl. Central U.) ; Chen, G M (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Chen, H S (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Chen, Y (Geneva U.) ; Cheng, L (Shandong U.) ; Chou, H Y (Taiwan, Natl. Central U.) ; Choutko, V (MIT) ; Chung, C H (Aachen, Tech. Hochsch.) ; Clark, C (MIT ; NASA, Houston) ; Coignet, G (Annecy, LAPP) ; Consolandi, C (Hawaii U.) ; Contin, A (INFN, Bologna ; U. Bologna (main)) ; Corti, C (Hawaii U.) ; Cui, Z (Shandong U.) ; Dadzie, K (MIT) ; Dai, Y M (Inst. Electr. Engin., Beijing) ; Datta, A (Hawaii U.) ; 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) ; Di Felice, V (INFN, Perugia) ; Díaz, C (Madrid, CIEMAT) ; Dimiccoli, F (TIFPA-INFN, Trento) ; von Doetinchem, P (Hawaii U.) ; Dong, F (Southeast U., Nanjing) ; Donnini, F (INFN, Perugia) ; Duranti, M (INFN, Perugia) ; Egorov, A (MIT) ; Eline, A (MIT) ; Feng, J (MIT) ; Fiandrini, E (INFN, Perugia ; Perugia U.) ; Fisher, P (MIT) ; Formato, V (INFN, Perugia) ; Galaktionov, Y (MIT) ; Gámez, C (Madrid, CIEMAT) ; García-López, R J (Laguna U., Tenerife ; IAC, La Laguna) ; Gargiulo, C (CERN) ; Gast, H (Aachen, Tech. Hochsch.) ; Gebauer, I (KIT, Karlsruhe, ETP) ; Gervasi, M (INFN, Milan Bicocca ; Milan Bicocca U.) ; Giovacchini, F (Madrid, CIEMAT) ; Gómez-Coral, D M (Mexico U.) ; Gong, J (Southeast U., Nanjing) ; Goy, C (Annecy, LAPP) ; Grabski, V (Mexico U.) ; Grandi, D (INFN, Milan Bicocca ; Milan Bicocca U.) ; Graziani, M (KIT, Karlsruhe, ETP) ; Guo, K H (SYSU, Guangzhou) ; Haino, S (Taiwan, Inst. Phys.) ; Han, K C (CSIST, Taiwan) ; He, Z H (SYSU, Guangzhou) ; Hsieh, T H (MIT) ; Huang, H (Taiwan, Inst. Phys.) ; Huang, Z C (SYSU, Guangzhou) ; Incagli, M (INFN, Pisa) ; Jang, W Y (CHEP, Taegu) ; Jia, Yi (MIT) ; Jinchi, H (CSIST, Taiwan) ; Kanishev, K (TIFPA-INFN, Trento) ; Khiali, B (INFN, Perugia) ; Kim, G N (CHEP, Taegu) ; Kirn, Th (Aachen, Tech. Hochsch.) ; Konyushikhin, M (MIT) ; Kounina, O (MIT) ; Kounine, A (MIT) ; Koutsenko, V (MIT) ; Kulemzin, A (MIT) ; La Vacca, G (INFN, Milan Bicocca ; Milan Bicocca U.) ; Laudi, E (CERN) ; Laurenti, G (INFN, Bologna) ; Lazzizzera, I (TIFPA-INFN, Trento ; Trento U.) ; Lebedev, A (MIT) ; Lee, H T (Taipei, Computing Ctr.) ; Lee, S C (Taiwan, Inst. Phys.) ; Li, J Q (Southeast U., Nanjing) ; Li, Q (Southeast U., Nanjing) ; Li, T X (SYSU, Guangzhou) ; Li, Z H (Beijing, Inst. High Energy Phys.) ; Light, C (Hawaii U.) ; Lin, C H (Taiwan, Inst. Phys.) ; Lippert, T (IAS, Julich ; JCHP, Julich) ; Liu, Z (Geneva U.) ; Lu, S Q (SYSU, Guangzhou) ; Lu, Y S (Beijing, Inst. High Energy Phys.) ; Luebelsmeyer, K (Aachen, Tech. Hochsch.) ; Luo, F (Shandong U.) ; Luo, J Z (Southeast U., Nanjing) ; Luo, Xi (Hawaii U.) ; Lyu, S S (SYSU, Guangzhou) ; Machate, F (Aachen, Tech. Hochsch.) ; Mañá, C (Madrid, CIEMAT) ; Marín, J (Madrid, CIEMAT) ; Martin, T (MIT ; NASA, Houston) ; Martínez, G (Madrid, CIEMAT) ; Masi, N (INFN, Bologna) ; Maurin, D (LPSC, Grenoble) ; Menchaca-Rocha, A (Mexico U.) ; Meng, Q (Southeast U., Nanjing) ; Mo, D C (SYSU, Guangzhou) ; Molero, M (Madrid, CIEMAT) ; Mott, P (MIT ; NASA, Houston) ; Mussolin, L (INFN, Perugia ; Perugia U.) ; Nelson, T (Hawaii U.) ; Ni, J Q (SYSU, Guangzhou) ; Nikonov, N (Aachen, Tech. Hochsch.) ; Nozzoli, F (TIFPA-INFN, Trento) ; Oliva, A (Madrid, CIEMAT) ; Orcinha, M (LIP, Lisbon) ; Palermo, M (Hawaii U.) ; Palmonari, F (INFN, Bologna ; U. Bologna (main)) ; Paniccia, M (Geneva U.) ; Pashnin, A (MIT) ; Pauluzzi, M (INFN, Perugia ; Perugia U.) ; Pensotti, S (INFN, Milan Bicocca ; Milan Bicocca U.) ; Phan, H D (MIT) ; Plyaskin, V (MIT) ; Poireau, V (Annecy, LAPP) ; Poluianov, S (Oulu U. ; Parkes Observ.) ; Popkow, A (Hawaii U.) ; Qi, X M (SYSU, Guangzhou) ; Qin, X (MIT) ; Qu, Z Y (Taiwan, Inst. Phys.) ; Quadrani, L (INFN, Bologna ; U. Bologna (main)) ; Rancoita, P G (INFN, Milan Bicocca) ; Rapin, D (Geneva U.) ; Reina Conde, A (Laguna U., Tenerife ; IAC, La Laguna) ; Rosier-Lees, S (Annecy, LAPP) ; Rozhkov, A (MIT) ; Rozza, D (INFN, Milan Bicocca ; Milan Bicocca U.) ; Sagdeev, R (Maryland U.) ; Schael, S (Aachen, Tech. Hochsch.) ; Schmidt, S M (IAS, Julich ; JCHP, Julich) ; Schulz von Dratzig, A (Aachen, Tech. Hochsch.) ; Schwering, G (Aachen, Tech. Hochsch.) ; Seo, E S (Maryland U.) ; Shan, B S (Beihang U.) ; Shi, J Y (Southeast U., Nanjing) ; Siedenburg, T (Aachen, Tech. Hochsch.) ; Solano, C (MIT) ; Song, J W (Shandong U.) ; Sun, Z T (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Tacconi, M (INFN, Milan Bicocca ; Milan Bicocca U.) ; Tang, X W (Beijing, Inst. High Energy Phys.) ; Tang, Z C (Beijing, Inst. High Energy Phys.) ; Tian, J (INFN, Perugia ; Perugia U.) ; Ting, Samuel C C (MIT ; CERN) ; Ting, S M (MIT) ; Tomassetti, N (INFN, Perugia ; Perugia U.) ; Torsti, J (Turku U.) ; Tüysüz, C (Middle East Tech. U., Ankara) ; Urban, T (MIT ; NASA, Houston) ; Usoskin, I (Oulu U. ; Parkes Observ.) ; Vagelli, V (INFN, Perugia ; Perugia U.) ; Vainio, R (Turku U.) ; Valente, E (INFN, Rome ; U. Rome La Sapienza (main)) ; Valtonen, E (Turku U.) ; Vázquez Acosta, M (Laguna U., Tenerife ; IAC, La Laguna) ; Vecchi, M (Groningen, KVI ; Sao Paulo U., Sao Carlos) ; Velasco, M (Madrid, CIEMAT) ; Vialle, J P (Annecy, LAPP) ; Wang, L Q (Shandong U.) ; Wang, N H (Shandong U.) ; Wang, Q L (Inst. Electr. Engin., Beijing) ; Wang, X (MIT) ; Wang, X Q (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Wang, Z X (SYSU, Guangzhou) ; Wei, J (Geneva U.) ; Weng, Z L (MIT) ; Wu, H (Southeast U., Nanjing) ; Xiong, R Q (Southeast U., Nanjing) ; Xu, W (MIT ; Shandong U.) ; Yan, Q (MIT) ; Yang, Y (Taiwan, Natl. Cheng Kung U.) ; Yi, H (Southeast U., Nanjing) ; Yu, Y J (Inst. Electr. Engin., Beijing) ; Yu, Z Q (Beijing, Inst. High Energy Phys.) ; Zannoni, M (INFN, Milan Bicocca ; Milan Bicocca U.) ; Zeissler, S (KIT, Karlsruhe, ETP) ; Zhang, C (Beijing, Inst. High Energy Phys.) ; Zhang, F (Beijing, Inst. High Energy Phys.) ; Zhang, J H (Southeast U., Nanjing) ; Zhang, Z (MIT) ; Zhao, F (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Zheng, Z M (Beihang U.) ; Zhuang, H L (Beijing, Inst. High Energy Phys.) ; Zhukov, V (Aachen, Tech. Hochsch.) ; Zichichi, A (INFN, Bologna ; U. Bologna (main)) ; Zimmermann, N (Aachen, Tech. Hochsch.) ; Zuccon, P (TIFPA-INFN, Trento ; Trento U.)

Publication 2019
Number of pages 8
In: Phys. Rev. Lett. 123 (2019) 181102
DOI 10.1103/PhysRevLett.123.181102
Subject category Astrophysics and Astronomy ; Particle Physics - Experiment
Abstract Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of $^{3}He$ and $^{4}He$ fluxes are presented. The measurements are based on 100 million $^{4}He$ nuclei in the rigidity range from 2.1 to 21 GV and 18 million He3 from 1.9 to 15 GV collected from May 2011 to November 2017. We observed that the $^{3}He$ and $^{4}He$ fluxes exhibit nearly identical variations with time. The relative magnitude of the variations decreases with increasing rigidity. The rigidity dependence of the $^{3}He/^{4}He$ flux ratio is measured for the first time. Below 4 GV, the $^{3}He/^{4}He$ flux ratio was found to have a significant long-term time dependence. Above 4 GV, the $^{3}He/^{4}He$ flux ratio was found to be time independent, and its rigidity dependence is well described by a single power law $\alpha R^{\Delta}$ with $\Delta=-0.294±0.004$. Unexpectedly, this value is in agreement with the B/O and B/C spectral indices at high energies.
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 Journalen skapades 2019-11-09, och modifierades senast 2019-11-27


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