3-10 August 2016
Chicago IL USA
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Precision Measurement of the (e$^{+}$+e$^{−}$) Flux in Primary Cosmic Rays from 0.5 GeV to 1 TeV with the Alpha Magnetic Spectrometer on the International Space Station (12' + 3')

4 Aug 2016, 09:00
Chicago 10 ()

Chicago 10

Sheraton Grand Chicago 301 East Water Street Chicago IL 60611 USA
Oral Presentation Astro-particle Physics and Cosmology Astro-particle Physics and Cosmology


Valerio Vagelli (Universita e INFN, Perugia (IT))


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. AMS measurements of individual e$^{+}$ and e$^{−}$ fluxes show neither e$^{+}$ nor e$^{−}$ can be described by a single power law above 27.2 and 52.3 GeV, respectively. Surprisingly, above 30.2 GeV, the combined (e$^{+}$+e$^{−}$) flux can be described accurately by a single power law with a spectral index γ=-3.170 ± 0.008(stat+syst) ± 0.008(energy scale).

Primary authors

Matteo Duranti (Universita e INFN, Perugia (IT)) Valerio Vagelli (Universita e INFN, Perugia (IT))

Presentation Materials