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We present evidence for a dependence of the average deep underground muon energies on shower size in the coincident EAS-TOP and LVD data at the Gran Sasso laboratories. The measured relation agrees with a mixed chemical composition of the cosmic ray primary spectrum at energies around 10 15 eV.
We report data taken by the LVD Experiment during a live-time period of 11 556 h. We have measured the muon intensity at slant depths of standard rock from about 3000 hg/cm 2 to about 20 000 hg/cm 2 . This is an exclusive study, namely our data include only events containing single muons. This interval of slant depth extends into the region where the dominant source of underground...
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