Abstract
A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8 × 10(6) positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to ∼ 250 GeV, but, from 20 to 250 GeV, the slope decreases by an order of magnitude. The positron fraction spectrum shows no fine structure, and the positron to electron ratio shows no observable anisotropy. Together, these features show the existence of new physical phenomena.
Highlights
The Alpha Magnetic Spectrometer, AMS-02, is a general purpose high energy particle physics detector
very accurate data show that the positron fraction is steadily increasing from
the slope decreases by an order of magnitude
Summary
The Alpha Magnetic Spectrometer, AMS-02, is a general purpose high energy particle physics detector.
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