Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aph....26...50c&link_type=abstract
Astroparticle Physics, Volume 26, Issue 1, p. 50-57.
Physics
3
Cosmic Rays
Scientific paper
High-energy interactions of cosmic rays with Earth atmosphere and the resulting extensive air showers have been simulated by means of the CORSIKA Monte Carlo code. Statistical fluctuations of the two-dimensional secondary Cerenkov photon density distributions at ground level produced by GeV cosmic γ rays and protons are studied by means of principal components analysis (PCA). This provides a decreasing sequence of covariance matrix eigenvalues that may be fitted to an analytical expression allowing to distinguish among different primary cosmic rays. A very efficient discrimination method of gamma ray induced showers from proton simulated extensive air showers is proposed as a result of this analysis. A cutting parameter is calculated, and the efficiency of the cutting procedure for γ-proton separation is evaluated under experimental conditions.
Contreras Jose Luis
Faleiro E.
Gómez M. G. J.
Molina Alfaro R.
Muñoz L.
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