Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer.

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

PHYSICAL REVIEW LETTERS（2019）

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摘要

Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of He-3 and He-4 fluxes are presented. The measurements are based on 100 million He-4 nuclei in the rigidity range from 2.1 to 21 GV and 18 million He-3 from 1.9 to 15 GV collected from May 2011 to November 2017. We observed that the He-3 and He-4 fluxes exhibit nearly identical variations with time. The relative magnitude of the variations decreases with increasing rigidity. The rigidity dependence of the He-3/He-4 flux ratio is measured for the first time. Below 4 GV, the He-3/He-4 flux ratio was found to have a significant long-term time dependence. Above 4 GV, the He-3/He-4 flux ratio was found to be time independent, and its rigidity dependence is well described by a single power law proportional to 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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cosmic helium isotopes,alpha

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