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Interpretation of Bremsstrahlung diagram

  1. May 3, 2015 #1
    This is what we have been given in class:


    I'm a little confused as the electron seems to emit two gamma rays? I understand that the process can't occur if there isn't interaction with a nucleus due to conservation of momentum. Please could someone confirm that the top gamma is the initial release due to deceleration / acceleration, and the lower gamma is there to satisfy conservation laws.

    Thanks for any help.
  2. jcsd
  3. May 3, 2015 #2


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    Why do you think the electron is emitting two gammas? One of the photons in the diagram is an internal line.
  4. May 3, 2015 #3
    Thanks. But internal in what sense?
  5. May 3, 2015 #4


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    Both ends are within the Feynman diagram, it does not leave/enter it => it does not get emitted.
  6. May 4, 2015 #5
    I didnt know that, many thanks!
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