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The cascade theory of cosmic rays is investigated from a new point of view; we deal with the number of particles produced in a certain thickness of matter, the energy of each particle being greater than E at the point of its production. This new approach leads to an elegant asymptotic theory for large thicknesses and it is better adapted to the interpretation of experiments in nuclear emulsions.

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One of us (R.) express his thanks to Professor W. Heisenberg for his kind invitation to visit the Max Planck Institute at Gottingen where this problem was suggested by Mr. Fay on the basis of his experimental results and the other (S.K.S.) is grateful to the University of Madras for the grant of a Government of India Schlorship.

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Ramakrishnan, A., Srinivasan, S.K. A new approach to the cascade theory. Proc. Indian Acad. Sci. 44, 263–273 (1956).

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