Abstract
The energy spectrum of the primary cosmic radiation has been derived from measurements of the muon energy spectrum at sea level with the DEIS spectrometer. The measured data have been fitted with production models using least-squares fit techniques. The obtained primary spectrum is in agreement with results from direct measurements at lower energies. In the energy range 1--50 TeV the power index has the value ..gamma.. = 2.72 +- 0.02.
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