Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer
Aguilar M; Cavasonza LA; Ambrosi G; Arruda L; Attig N; Bachlechner A; Barao F; Barrau A; Barrin L; Bartoloni A; Basegmez-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 MJ; Bourquin M; Bueno EF; Burger J; Burger WJ; Cai XD; Capell M; Caroff S; Casaus J; Castellini G; Cervelli F; Chang YH; Chen GM; Chen HS; Chen Y; Cheng L; Chou HY; Choutko V; Chung CH; Clark C; Coignet G; Consolandi C; Contin A; Corti C; Cui Z; Dadzie K; Dai YM; Datta A; Delgado C; Della Torre S; Demirkoz MB; Derome L; Di Falco S; Di Felice V; Diaz 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; Gamez C; Garcia-Lopez RJ; Gargiulo C; Gast H; Gebauer I; Gervasi M; Giovacchini F; Gomez-Coral DM; Gong J; Goy C; Grabski V; Grandi D; Graziani M; Guo KH; Haino S; Han KC; He ZH; Hsieh TH; Huang H; Huang ZC; Incagli M; Jang WY; Jia Y; Jinchi H; Kanishev K; Khiali B; Kim GN; Kirn T; Konyushikhin M; Kounina O; Kounine A; Koutsenko V; Kulemzin A; La Vacca G; Laudi E; Laurenti G; Lazzizzera I; Lebedev A; Lee HT; Lee SC; Li JQ; Li Q; Li TX; Li ZH; Light C; Lin CH; Lippert T; Liu Z; Lu SQ; Lu YS; Luebelsmeyer K; Luo F; Luo JZ; Luo X; Lyu SS; Machate F; Mana C; Marin J; Martin T; Martinez G; Masi N; Maurin D; Menchaca-Rocha A; Meng Q; Mo DC; Molero M; Mott P; Mussolin L; Nelson T; Ni JQ; Nikonov N; Nozzoli F; Oliva A; Orcinha M; Palermo M; Palmonari F; Paniccia M; Pashnin A; Pauluzzi M; Pensotti S; Phan HD; Plyaskin V; Poireau V; Poluianov S; Popkow A; Qi XM; Qin X; Qu ZY; Quadrani L; Rancoita PG; Rapin D; Conde AR; Rosier-Lees S; Rozhkov A; Rozza D; Sagdeev R; Schael S; Schmidt SM; von Dratzig AS; Schwering G; Seo ES; Shan BS; Shi JY; Siedenburg T; Solano C; Song JW; Sun ZT; Tacconi M; Tang XW; Tang ZC; Tian J; Ting SCC; Ting SM; Tomassetti N; Torsti J; Tuysuz C; Urban T; Usoskin I; Vagelli V; Vainio R; Valente E; Valtonen E; Acosta MV; Vecchi M; Velasco M; Vialle JP; Wang LQ; Wang NH; Wang QL; Wang X; Wang XQ; Wang ZX; Wei J; Weng ZL; Wu H; Xiong RQ; Xu W; Yan Q; Yang Y; Yi H; Yu YJ; Yu ZQ; Zannoni M; Zeissler S; Zhang C; Zhang F; Zhang JH; Zhang Z; Zhao F; Zheng ZM; Zhuang HL; Zhukov V; Zichichi A; Zimmermann N; Zuccon P
Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer
AMER PHYSICAL SOC
Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021042822873
https://urn.fi/URN:NBN:fi-fe2021042822873
Tiivistelmä
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.
Kokoelmat
- Rinnakkaistallenteet [29335]