Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer

AMS Collaboration

研究成果: 雜誌貢獻期刊論文同行評審

42 引文 斯高帕斯(Scopus)

摘要

Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of He3 and He4 fluxes are presented. The measurements are based on 100 million He4 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 He3 and He4 fluxes exhibit nearly identical variations with time. The relative magnitude of the variations decreases with increasing rigidity. The rigidity dependence of the He3/He4 flux ratio is measured for the first time. Below 4 GV, the He3/He4 flux ratio was found to have a significant long-term time dependence. Above 4 GV, the He3/He4 flux ratio was found to be time independent, and its rigidity dependence is well described by a single power law ∈RΔ with Δ=-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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文章編號181102
期刊Physical Review Letters
123
發行號18
DOIs
出版狀態已出版 - 1 11月 2019

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