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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-4381
DTSTART:20170119T203000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T182421Z
LAST-MODIFIED:20170113T174244Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Cosmic-ray proton measurements with the Fermi-LAT\, NPAC (Nucl
 ear/Particle/Astro/Cosmo) Forum\,  David Green\, University of Marylan
 d/Goddard
DESCRIPTION:The Large Area Telescope (LAT) on the Fermi Gamma-ray Spac
 e Telescope has continuously observed the gamma-ray sky since June 200
 8.<br>
\nCosmic-ray protons represent the majority of events downloade
 d from the Fermi-LAT\, which are removed from the gamma-ray dataset. O
 ur sample is comprised of over 1 billion cosmic-ray protons to TeV ene
 rgies. We present the measurement of the cosmic-ray proton spectrum be
 tween 54 GeV and 9.5 TeV using 7 years of Pass 8 flight data from the 
 Fermi-LAT. We developed a dedicated proton event selection with an acc
 eptance of 0.25 m^2 sr. Our analysis yields a large dataset with low s
 tatistical uncertainty and low residual contamination for a spectral m
 easurement. The systematic errors associated with the acceptance\, ene
 rgy measurement\, GEANT4 Monte-Carlo simulations are an order of magni
 tude larger than the statistical uncertainty. The event selection and 
 spectral measurement of the proton analysis create the opportunity for
  additional proton analyses with the Fermi-LAT\, such as a dedicated p
 roton anisotropy search.
URL:https://www.physics.wisc.edu/events/?id=4381
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