# Precision Measurement of the (${\rm e}^+$ + ${\rm e}^−$) Flux in Primary Cosmic Rays from 0.5 GeV to 1 TeV with the Alpha Magnetic Spectrometer on the International Space Station

Abstract

We present a measurement of the cosmic ray $(e^+ + e^-)$ flux in the range 0.5 GeV to 1 TeV based on the analysis of 10.6 million $(e^+ + e^-)$ events collected by AMS. The statistics and the resolution of AMS provide a precision measurement of the flux. The flux is smooth and reveals new and distinct information. Above 30.2 GeV, the flux can be described by a single power law with a spectral index $\gamma = -3.170 \pm 0.008(\rm{stat+syst}) \pm 0.008(\rm{energy\ scale})$.