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The primary cosmic-ray spectrum has been measured up to an energy of 10^20 eV, and several groups have described projects under development or in mind to investigate the spectrum further, into the energy range 10^21-10^22 eV. This note predicts that above 10^20 eV the primary spectrum will steepen abruptly, and the experiments in preparation will at last observe it to have a cosmologically meaningful termination.
K. Greisen (Mon,) studied this question.
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