Interpretation of Bremsstrahlung diagram

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Discussion Overview

The discussion revolves around the interpretation of a Bremsstrahlung diagram, specifically addressing the emission of gamma rays by an electron during interactions with a nucleus. Participants explore the implications of conservation laws in this context.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant expresses confusion about the diagram, suggesting that the electron emits two gamma rays and seeks confirmation regarding their roles in the process.
  • Another participant questions the assumption that the electron emits two gamma rays, indicating that one of the photons is an internal line within the Feynman diagram.
  • A further reply seeks clarification on what is meant by "internal" in this context.
  • Another participant explains that both ends of the internal line are within the Feynman diagram, implying that it does not represent an emitted photon.
  • A later response acknowledges the clarification about the internal line, indicating a learning moment for that participant.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the interpretation of the gamma rays in the diagram, with some confusion remaining about the nature of the internal line and its implications.

Contextual Notes

The discussion highlights the need for clarity regarding the definitions and roles of internal versus external lines in Feynman diagrams, as well as the conservation laws involved in the Bremsstrahlung process.

rwooduk
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This is what we have been given in class:

nMbzaP0.jpg


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.
 
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rwooduk said:
I'm a little confused as the electron seems to emit two gamma rays?

Why do you think the electron is emitting two gammas? One of the photons in the diagram is an internal line.
 
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Orodruin said:
Why do you think the electron is emitting two gammas? One of the photons in the diagram is an internal line.

Thanks. But internal in what sense?
 
Both ends are within the Feynman diagram, it does not leave/enter it => it does not get emitted.
 
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mfb said:
Both ends are within the Feynman diagram, it does not leave/enter it => it does not get emitted.

I didnt know that, many thanks!
 

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