Abstract
The energy dependence and angular distribution of the sea level muon intensity have been determined from measurements made inside the second pyramid at Giza, Cairo. It is concluded from these measurements that the sea level muon integral spectrum may be represented in the energy range 50-70 GeV by the power law I(E, theta )=KE-2.09(cos theta )-0.02 where E is expressed in GeV, theta is the angle to the vertical and K is a constant. The above values of energy and cosine exponents are found to be in agreement with those calculated using the CKP interaction model if pions are assumed to be the parents of the majority of muons reaching sea level with energies in the range considered. Calculations made for various energies using this model also show general accordance with the experimental results of other authors. This indicates further support for the application of the model to primary interactions at high energies.
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