| Literature DB >> 31763896 |
M Aguilar1, L Ali Cavasonza2, G Ambrosi3, L Arruda4, N Attig5, A Bachlechner2, F Barao4, A Barrau6, L Barrin7, A Bartoloni8, S Başeğmez-du Pree9, R Battiston10,11, U Becker12, M Behlmann12, B Beischer2, J Berdugo1, B Bertucci3,13, V Bindi14, W de Boer15, K Bollweg16, B Borgia8,17, M J Boschini18, M Bourquin19, E F Bueno9, J Burger12, W J Burger10, X D Cai12, M Capell12, S Caroff20, J Casaus1, G Castellini21, F Cervelli22, Y H Chang23, G M Chen24,25, H S Chen24,25, Y Chen19, L Cheng26, H Y Chou23, V Choutko12, C H Chung2, C Clark12,16, G Coignet20, C Consolandi14, A Contin27,28, C Corti14, Z Cui26, K Dadzie12, Y M Dai29, A Datta14, C Delgado1, S Della Torre18, M B Demirköz30, L Derome6, S Di Falco22, V Di Felice3, C Díaz1, F Dimiccoli10, P von Doetinchem14, F Dong31, F Donnini3, M Duranti3, A Egorov12, A Eline12, J Feng12, E Fiandrini3,13, P Fisher12, V Formato3, Y Galaktionov12, C Gámez1, R J García-López32, C Gargiulo7, H Gast2, I Gebauer15, M Gervasi18,33, F Giovacchini1, D M Gómez-Coral34, J Gong31, C Goy20, V Grabski34, D Grandi18,33, M Graziani15, K H Guo35, S Haino36, K C Han37, Z H He35, T H Hsieh12, H Huang36, Z C Huang35, M Incagli22, W Y Jang38, Yi Jia12, H Jinchi37, K Kanishev10, B Khiali3, G N Kim38, Th Kirn2, M Konyushikhin12, O Kounina12, A Kounine12, V Koutsenko12, A Kulemzin12, G La Vacca18,33, E Laudi7, G Laurenti27, I Lazzizzera10,11, A Lebedev12, H T Lee39, S C Lee36, J Q Li31, Q Li31, T X Li35, Z H Li24, C Light14, C H Lin36, T Lippert5, Z Liu19, S Q Lu35, Y S Lu24, K Luebelsmeyer2, F Luo26, J Z Luo31, Xi Luo14, S S Lyu35, F Machate2, C Mañá1, J Marín1, T Martin12,16, G Martínez1, N Masi27, D Maurin6, A Menchaca-Rocha34, Q Meng31, D C Mo35, M Molero1, P Mott12,16, L Mussolin3,13, T Nelson14, J Q Ni35, N Nikonov2, F Nozzoli10, A Oliva1, M Orcinha4, M Palermo14, F Palmonari27,28, M Paniccia19, A Pashnin12, M Pauluzzi3,13, S Pensotti18,33, H D Phan12, V Plyaskin12, V Poireau20, S Poluianov40, A Popkow14, X M Qi35, X Qin12, Z Y Qu36, L Quadrani27,28, P G Rancoita18, D Rapin19, A Reina Conde32, S Rosier-Lees20, A Rozhkov12, D Rozza18,33, R Sagdeev41, S Schael2, S M Schmidt5, A Schulz von Dratzig2, G Schwering2, E S Seo42, B S Shan43, J Y Shi31, T Siedenburg2, C Solano12, J W Song26, Z T Sun24,25, M Tacconi18,33, X W Tang24, Z C Tang24, J Tian3,13, Samuel C C Ting12,7, S M Ting12, N Tomassetti3,13, J Torsti44, C Tüysüz30, T Urban12,16, I Usoskin40, V Vagelli3,13, R Vainio44, E Valente8,17, E Valtonen44, M Vázquez Acosta32, M Vecchi9,45, M Velasco1, J P Vialle20, L Q Wang26, N H Wang26, Q L Wang29, X Wang12, X Q Wang24,25, Z X Wang35, J Wei19, Z L Weng12, H Wu31, R Q Xiong31, W Xu12,26, Q Yan12, Y Yang46, H Yi31, Y J Yu29, Z Q Yu24, M Zannoni18,33, S Zeissler15, C Zhang24, F Zhang24, J H Zhang31, Z Zhang12, F Zhao24,25, Z M Zheng43, H L Zhuang24, V Zhukov2, A Zichichi27,28, N Zimmermann2, P Zuccon10,11.
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 ^{3}He 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 ∝R^{Δ} with Δ=-0.294±0.004. Unexpectedly, this value is in agreement with the B/O and B/C spectral indices at high energies.Entities:
Year: 2019 PMID： 31763896 DOI： 10.1103/PhysRevLett.123.181102
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161