Abstract
A simulation of integral size spectra with various assumptions about the primary energy spectrum has been performed at different depths and in several zenith angle bins (0 degrees -40 degrees ). The absorption length Lambda has been derived directly from the data with accurate consideration of the experimental procedures, the angular and barometric methods. A systematic consequence of the steepening of the primary spectrum ('knee effect') is seen to emerge in the behaviour of Lambda as a function of size between 104 and 108 particles. A consecutive interpretation of the present data in terms of dynamical ultra-high-energy interactions reveals a strong disagreement with the Feynman scaling hypothesis.
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