There is a narrow beam of negative pions with kinetic energy T equal to the rest energy

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There is a narrow beam of negative pions with kinetic energy T equal to the rest energy of these particles. Find the ratio of fluxes at the sections of the beam separated by a distance l = 20 m. The proper mean lifetime of these pions is τ0 = 25.5 ns.
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Physics

ISBN: 978-0321976444

5th edition

Authors: James S. Walker

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