Electron and Positron Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station
Electron and Positron Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station
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DOI：
10.1103/physrevlett.113.121102
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发表时间：
2014-09
影响因子：
8.6
通讯作者：
M. Aguilar;D. Aisa;A. Alvino;G. Ambrosi;K. Andeen;L. Arruda;N. Attig;P. Azzarello;A. Bachlechner-A.
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文献类型：
--
作者：
M. Aguilar;D. Aisa;A. Alvino;G. Ambrosi;K. Andeen;L. Arruda;N. Attig;P. Azzarello;A. Bachlechner-A.
介绍了国际空间站上的阿尔法磁谱仪对0.5至700 GeV范围内的初级宇宙射线电子通量和0.5至500 GeV范围内的正电子通量的精确测量。电子通量和正电子通量都需要一个超越单一幂律谱的描述。电子通量和正电子通量在2.30 GeV时都改变了它们的行为，但通量的大小和能量依赖性显着不同。在20和200 GeV之间，正电子光谱指数明显比电子光谱指数硬。确定光谱指数与能量的不同行为是一个新的观察，并提供了关于宇宙射线电子和正电子起源的重要信息。
Precision measurements by the Alpha Magnetic Spectrometer on the International Space Station of the primary cosmic-ray electron flux in the range 0.5 to 700 GeV and the positron flux in the range 0.5 to 500 GeV are presented. The electron flux and the positron flux each require a description beyond a single power-law spectrum. Both the electron flux and the positron flux change their behavior at ∼30 GeV but the fluxes are significantly different in their magnitude and energy dependence. Between 20 and 200 GeV the positron spectral index is significantly harder than the electron spectral index. The determination of the differing behavior of the spectral indices versus energy is a new observation and provides important information on the origins of cosmic-ray electrons and positrons.