Composition of primary cosmic rays at energies ~1015 eV from data on high-energy muons in extensive air showers

Details Composition of primary cosmic rays at energies ~1015 eV from data on high-energy muons in extensive air showers Composition of primary cosmic rays at energies ~1015 eV from data on high-energy muons in extensive air showers

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phrvd..29..892y&link_type=abstract

Physical Review D (Particles and Fields), Volume 29, Issue 5, 1 March 1984, pp.892-901

Physics

16

Scientific paper

A critical analysis of experimental data on high-energy muons in air showers is carried out to derive information about the composition of primary cosmic rays near the bend in the energy spectrum at ~1015 eV. A set of Monte Carlo simulated air showers from different elemental species have been used to study expectations for three different experiments: the Tien Shan study of muons with energy above 5 GeV at an altitude of 690 g/cm2, the Moscow State University experiment for muons with energy above 10 GeV at sea level, and the Kolar-gold-field experiment for muons with energy above 220 GeV at 930 g/cm2. The results show that when showers are grouped according to shower size the sensitivity of the total number of high-energy muons to primary composition is greatly reduced. In fact, it is found that the data cannot discriminate between models which assume energy-independent low-energy composition and those which assume energy spectra which steepen above some value of rigidity cutoff around 1014 eV/nucleon. In order to make a compositionsensitive measurement of the high-energy muon component it is necessary to make these measurements at fixed energy rather than at fixed shower size.

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