Würzburg 2018 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

EP: Fachverband Extraterrestrische Physik

EP 14: Astrophysics III - Magnetic Fields, Stellar Clusters, Cosmic Rays and Cosmology

EP 14.4: Talk

Friday, March 23, 2018, 11:45–12:00, BSZ - Pabel HS

Measurement of the Cosmic-ray Proton Spectrum with the Fermi Large Area Telescope — •David Green for the The Fermi Large Area Telescope collaboration — Max Planck Institut für Physik, Munich, DE

We present the measurement of the cosmic-ray proton spectrum between 54 GeV and 9.5 TeV using 7 years of Pass 8 flight data from the Fermi Large Area Telescope (LAT). We developed a dedicated proton event selection with an acceptance of 0.25 m² sr. Our event selection yields a large dataset with a statistical uncertainty under 2% and residual contamination less than 5% across the entire energy range. The systematic errors associated with the acceptance, energy measurement, and GEANT4 Monte Carlo simulations are an order of magnitude larger than the statistical uncertainty. The resulting event selection and spectral measurement create the opportunity for additional proton analyses with the LAT, such as a dedicated proton anisotropy search.