Study of the ultrahigh-energy primary-cosmic-ray composition with the MACRO experiment

Details Study of the ultrahigh-energy primary-cosmic-ray composition with the MACRO experiment Study of the ultrahigh-energy primary-cosmic-ray composition with the MACRO experiment

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvd..46..895a&link_type=abstract

Physical Review D (Particles and Fields), Volume 46, Issue 3, 1 August 1992, pp.895-902

Physics

29

Cosmic Rays

Scientific paper

We present the analysis of multiple-muon events collected with one supermodule (1013 h live time) and two supermodules (1195 h live time) of the MACRO detector at Gran Sasso, Italy. Multimuon rates are shown to be sensitive to primary-cosmic-ray energies between ~50 TeV and several thousand TeV. Experimental data are compared with the expected rates from two composition models: a light (i.e., proton-rich) and a heavy (i.e., Fe-rich) composition. The predictions are based on a Monte Carlo simulation of the hadronic interactions of cosmic-ray nuclei, followed by a detailed tracking of the muons through the rock and the experimental apparatus. The results show good sensitivity of the MACRO detector to primary composition. The data exhibit a preference towards the light composition model.

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