Abstract
A study of the primary cosmic ray composition in the energy range 5ṡ1014-5ṡ1015 eV is performed through the analysis of the deep underground muons and of the e.m. component of Extensive Air Showers detected in coincidence by the MACRO and EAS-TOP experiments at the Gran Sasso Laboratory. We conclude that: a) pure proton and Iron primary beams are excluded by the experimental data; b) a fraction of nuclei heavier than Helium is necessary to explain the experimental data both below and above the knee; c) a mixed composition, obtained a priori from extrapolations of the spectra directly measured below 100 TeV, yields a reasonable account of the observations up to the knee of the primary spectrum.
| Original language | English |
|---|---|
| Pages (from-to) | 376-382 |
| Number of pages | 7 |
| Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
| Volume | 337 |
| Issue number | 3-4 |
| DOIs | |
| Publication status | Published - 13 Oct 1994 |
| Externally published | Yes |
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