Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Does Pair Creation = Bremsstrahlung?

  1. Dec 19, 2005 #1
    In Chapter 6 of M. Kaku's book (QFT), he wrote (p184) "...by rotating the diagram around, we can convert bremsstrahlung into pair creation." Bremsstrahlung, as far as I know, involves atoms. Does this mean that when bremsstrahlung with >1.2 MeV strikes an atom we will get an electron and a positron?
  2. jcsd
  3. Dec 19, 2005 #2


    User Avatar
    Science Advisor
    Homework Helper

    Try doing some reading from Lifschitz, Berestetskii & Pitaevskii's book on QED (volume #4 of Landau & Lifschitz' course on Theoretical Physics).

  4. Dec 20, 2005 #3

    Meir Achuz

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Kaku meant that the FDs for brem and for pair prod have the same topology. What he meant by "rotate" is to change the physics of which particles come in and go out. Physically, brem and pp are very different.
    In brem: e+proton--> e+proton+gamma.
    In pp: gamma + proton--> proton + e + positron.
    The two FDs have the same lines, just in different orders.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook