The nuclear mass composition of UHECR with the Pierre Auger Observatory

Details The nuclear mass composition of UHECR with the Pierre Auger Observatory The nuclear mass composition of UHECR with the Pierre Auger Observatory

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..apr.t7003m&link_type=abstract

American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #T7.003

Physics

Scientific paper

The Fluorescence Detector of the Pierre Auger Observatory measures the atmospheric depth Xmax where the longitudinal profile of the UHECR (Ultra High Energy Cosmic Ray) induced electromagnetic cascade reaches its maximum. This is sensitive to the nuclear mass composition of the cosmic rays. Due to its hybrid design, the Pierre Auger Observatory also provides independent experimental observables for the study of the nuclear mass composition coming from the Surface Detector. We present Xmax distributions and an update of the average and RMS values in different energy bins and compare them to the predictions for different nuclear masses and hadronic models. We also present the results of the composition sensitive parameters derived from the ground level component.

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