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History. Henri Becquerel Victor Hess Robert Millikan Pierre Auger Enrico Fermi. The Nature of Cosmic Rays. 50% Protons 25% Alpha Particles 13% Heavier Nuclei 1% Electrons and Gamma Rays. The Air Shower. The Ultimate Source of Cosmic Rays?.
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History • Henri Becquerel • Victor Hess • Robert Millikan • Pierre Auger • Enrico Fermi
The Nature of Cosmic Rays • 50% Protons • 25% Alpha Particles • 13% Heavier Nuclei • 1% Electrons and Gamma Rays