BEXCO - Room A(101/102)
[CRD061] Precision Measurement of Carbon and Oxygen Fluxes in Primary Cosmic Rays with the Alpha Magnetic Spectrometer on the ISS
Carbon and oxygen nuclei in cosmic rays are believed to be mainly produced and accelerated by Galactic sources such as supernova remnants. Detailed knowledge of the carbon and oxygen spectrums in the GV-TV rigidity region gives important information on the origin, acceleration, and propagation processes of cosmic rays. A precise measurement of the carbon and the oxygen fluxes from 2 GV to 3 TV is presented based on 15.7 million events collected by AMS in the first five years of operation. The flux measurement error is less than 3% at 100 GV. The detailed variation with rigidity of the carbon and the oxygen flux spectral indexes is reported for the first time. Unexpectedly, both spectral indexes harden at high rigidities.