Abstract
The Alpha Magnetic Spectrometer (AMS-02) is a state of the art particle detector measuring cosmic rays at the International Space Station (ISS) since May 19th 2011. AMS-02 identifies cosmic rays up to iron in an energy range from MeV to TeV. Five physics sub-systems of the detector allow for redundant particle identification with unprecedented precision. With a positron-proton separation power in the order of 10 a very high purity of the antiparticle spectra can be obtained. Here, a brief overview of the detector operation and particle identification is given. The measurement of the positron fraction from 0.5 to 350 GeV is presented. The data shows that the positron fraction steadily rises above 10 GeV, whereas the slope of the rise decreases by an order of magnitude towards the highest energies analyzed. The fraction shows no fine structure and the e/e-ratio is consistent with isotropy, therefore an upper limit for the anisotropy is obtained. The measurement clearly indicates that new physics phenomena need to be included to describe the observed positron fraction.
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