Precision Measurement of the Proton Flux in Primary Cosmic Rays from Rigidity 1 GV to 1.8 TV with the Alpha Magnetic Spectrometer on the International Space Station


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Aguilar M., Aisa D., Alpat B., Alvino A., Ambrosi G., Andeen K., ...More

PHYSICAL REVIEW LETTERS, vol.114, no.17, 2015 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 114 Issue: 17
  • Publication Date: 2015
  • Doi Number: 10.1103/physrevlett.114.171103
  • Title of Journal : PHYSICAL REVIEW LETTERS

Abstract

A precise measurement of the proton flux in primary cosmic rays with rigidity (momentum/charge) from 1 GV to 1.8 TV is presented based on 300 million events. Knowledge of the rigidity dependence of the proton flux is important in understanding the origin, acceleration, and propagation of cosmic rays. We present the detailed variation with rigidity of the flux spectral index for the first time. The spectral index progressively hardens at high rigidities.