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Precision Measurement of the Helium Flux in Primary Cosmic Rays of Rigidities 1.9 GV to 3 TV with the Alpha Magnetic Spectrometer on the International Space Station
AMS Collaboration
2015
发表期刊PHYSICAL REVIEW LETTERS
卷号115页码:211101
文章类型Article
摘要Knowledge of the precise rigidity dependence of the helium flux is important in understanding the origin, acceleration, and propagation of cosmic rays. A precise measurement of the helium flux in primary cosmic rays with rigidity (momentum/charge) from 1.9 GV to 3 TV based on 50 million events is presented and compared to the proton flux. The detailed variation with rigidity of the helium flux spectral index is presented for the first time. The spectral index progressively hardens at rigidities larger than 100 GV. The rigidity dependence of the helium flux spectral index is similar to that of the proton spectral index though the magnitudes are different. Remarkably, the spectral index of the proton to helium flux ratio increases with rigidity up to 45 GV and then becomes constant; the flux ratio above 45 GV is well described by a single power law.
学科领域Physics
DOI10.1103/PhysRevLett.115.211101
收录类别SCI ; EI
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000364910500002
引用统计
被引频次:110[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228807
专题粒子天体物理中心
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AMS Collaboration. Precision Measurement of the Helium Flux in Primary Cosmic Rays of Rigidities 1.9 GV to 3 TV with the Alpha Magnetic Spectrometer on the International Space Station[J]. PHYSICAL REVIEW LETTERS,2015,115:211101.
APA AMS Collaboration.(2015).Precision Measurement of the Helium Flux in Primary Cosmic Rays of Rigidities 1.9 GV to 3 TV with the Alpha Magnetic Spectrometer on the International Space Station.PHYSICAL REVIEW LETTERS,115,211101.
MLA AMS Collaboration."Precision Measurement of the Helium Flux in Primary Cosmic Rays of Rigidities 1.9 GV to 3 TV with the Alpha Magnetic Spectrometer on the International Space Station".PHYSICAL REVIEW LETTERS 115(2015):211101.
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