Protons and neutrons in nuclei are bound to the nucleus by exchanging pions ( mesons) with each

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Protons and neutrons in nuclei are bound to the nucleus by exchanging pions (π mesons) with each other. This is possible to do without violating energy conservation provided the pion is re-absorbed within a time consistent with the Heisenberg uncertainty relations. Consider the emission reaction p → p + π where mπ = 135 MeV/c2.

(a) Ignoring kinetic energy, by how much is energy conservation violated in this reaction?

(b) Within what time interval must the pion be re-absorbed in order to avoid violation of energy conservation?

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Modern Physics

ISBN: 9781429250788

6th Edition

Authors: Paul A. Tipler, Ralph Llewellyn

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