Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer

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...

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Detalles Bibliográficos
Autores principales: Aguilar, M, Ali Cavasonza, L, Ambrosi, G, Arruda, L, Attig, N, Bachlechner, A, Barao, F, Barrau, A, Barrin, L, Bartoloni, A, Başeğmez-du Pree, S, Battiston, R, Becker, U, Behlmann, M, Beischer, B, Berdugo, J, Bertucci, B, Bindi, V, de Boer, W, Bollweg, K, Borgia, B, Boschini, M J, Bourquin, M, Bueno, E F, Burger, J, Burger, W J, Cai, X D, Capell, M, Caroff, S, Casaus, J, Castellini, G, Cervelli, F, Chang, Y H, Chen, G M, Chen, H S, Chen, Y, Cheng, L, Chou, H Y, Choutko, V, Chung, C H, Clark, C, Coignet, G, Consolandi, C, Contin, A, Corti, C, Cui, Z, Dadzie, K, Dai, Y M, Datta, A, Delgado, C, Della Torre, S, Demirköz, M B, Derome, L, Di Falco, S, Di Felice, V, Díaz, C, Dimiccoli, F, von Doetinchem, P, Dong, F, Donnini, F, Duranti, M, Egorov, A, Eline, A, Feng, J, Fiandrini, E, Fisher, P, Formato, V, Galaktionov, Y, Gámez, C, García-López, R J, Gargiulo, C, Gast, H, Gebauer, I, Gervasi, M, Giovacchini, F, Gómez-Coral, D M, Gong, J, Goy, C, Grabski, V, Grandi, D, Graziani, M, Guo, K H, Haino, S, Han, K C, He, Z H, Hsieh, T H, Huang, H, Huang, Z C, Incagli, M, Jang, W Y, Jia, Yi, Jinchi, H, Kanishev, K, Khiali, B, Kim, G N, Kirn, Th, Konyushikhin, M, Kounina, O, Kounine, A, Koutsenko, V, Kulemzin, A, La Vacca, G, Laudi, E, Laurenti, G, Lazzizzera, I, Lebedev, A, Lee, H T, Lee, S C, Li, J Q, Li, Q, Li, T X, Li, Z H, Light, C, Lin, C H, Lippert, T, Liu, Z, Lu, S Q, Lu, Y S, Luebelsmeyer, K, Luo, F, Luo, J Z, Luo, Xi, Lyu, S S, Machate, F, Mañá, C, Marín, J, Martin, T, Martínez, G, Masi, N, Maurin, D, Menchaca-Rocha, A, Meng, Q, Mo, D C, Molero, M, Mott, P, Mussolin, L, Nelson, T, Ni, J Q, Nikonov, N, Nozzoli, F, Oliva, A, Orcinha, M, Palermo, M, Palmonari, F, Paniccia, M, Pashnin, A, Pauluzzi, M, Pensotti, S, Phan, H D, Plyaskin, V, Poireau, V, Poluianov, S, Popkow, A, Qi, X M, Qin, X, Qu, Z Y, Quadrani, L, Rancoita, P G, Rapin, D, Reina Conde, A, Rosier-Lees, S, Rozhkov, A, Rozza, D, Sagdeev, R, Schael, S, Schmidt, S M, Schulz von Dratzig, A, Schwering, G, Seo, E S, Shan, B S, Shi, J Y, Siedenburg, T, Solano, C, Song, J W, Sun, Z T, Tacconi, M, Tang, X W, Tang, Z C, Tian, J, Ting, Samuel C C, Ting, S M, Tomassetti, N, Torsti, J, Tüysüz, C, Urban, T, Usoskin, I, Vagelli, V, Vainio, R, Valente, E, Valtonen, E, Vázquez Acosta, M, Vecchi, M, Velasco, M, Vialle, J P, Wang, L Q, Wang, N H, Wang, Q L, Wang, X, Wang, X Q, Wang, Z X, Wei, J, Weng, Z L, Wu, H, Xiong, R Q, Xu, W, Yan, Q, Yang, Y, Yi, H, Yu, Y J, Yu, Z Q, Zannoni, M, Zeissler, S, Zhang, C, Zhang, F, Zhang, J H, Zhang, Z, Zhao, F, Zheng, Z M, Zhuang, H L, Zhukov, V, Zichichi, A, Zimmermann, N, Zuccon, P
Lenguaje:eng
Publicado: 2019
Materias:
Astrophysics and Astronomy
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.123.181102
http://cds.cern.ch/record/2699862
Descripción
Sumario: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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