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We consider the possibility that the cosmic-ray knee is produced by a change in the nature of the hadronic interaction at approximately 1 TeV center of mass. Speciflcally we explore the result of the opening up of a new production channel whose output is undetectable by current air shower techniques. 1. The problems One current explanation of the cosmic-ray knee asserts that the spectrum of supernova produced cosmic rays ends at approximately 3 £ 1015eV and is replaced, above this energy by a spectrum of particles from a difierent, perhaps extra-galactic, source. The problem with this particular explanation is that it requires a rather precise matching of the two spectra in two characteristics that should have no particular relationship with each other.

Groping for the (cosmic-ray) knee