Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..apr.r8001b&link_type=abstract
American Physical Society, 2009 APS April Meeting, May 2-5, 2009, abstract #R8.001
Physics
Scientific paper
Both the mean value of airshower maximum Xmax and the width of the Xmax distribution are known to be sensitive to the chemical composition of cosmic rays initiating a set of extensive airshowers. Thus, studies of Xmax are an important part of efforts to understand the nature and origin of Ultra-High Energy Cosmic Rays, the most energetic elementary particles known in the universe. With the Northern Hemisphere's largest exposure to date to cosmic rays above 10^18 eV, the two fluorescence detectors of the High-Resolution Fly's Eye (HiRes) Observatory are uniquely positioned to study this phenomenon. Here, we report the results of recent studies of the depth of airshower maximum Xmax in cosmic-ray induced extensive airshowers observed in stereo by HiRes.
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