Cosmic Ray Composition Studies with the High Resolution Fly's Eye

Details Cosmic Ray Composition Studies with the High Resolution Fly's Eye Cosmic Ray Composition Studies with the High Resolution Fly's Eye

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..4cf.c1003b&link_type=abstract

American Physical Society, Fall 2009 Meeting of the Four Corners Section of the APS, October 23-24, 2009, abstract #C1.003

Physics

Scientific paper

The depth of shower maximum or Xmax of extensive airshowers is a sensitive probe of the chemical composition of ultra-high energy cosmic rays. Both the evolution of mean Xmax with energy and the width of the Xmax distribution can provide clues as to the species of the particles initiating the airshowers. Here, we report the results of composition studies using Xmax with data collected in stereoscopic mode by the High-Resolution Fly's Eye observatory. The HiRes data are best explained by a predominantly protonic composition above 1.6 EeV.

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