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Homework Help: Undefined angles for Compton scattering

  1. Apr 3, 2012 #1
    1. The problem statement, all variables and given/known data
    Hello, I need to find which values for θ and ψ are not defined for the Compton scattering. Where θ is the angle of the electron and ψ is the angle for the photon.

    2. Relevant equations
    I have attached the formulas I´m using.

    3. The attempt at a solution
    According to me ψ≠0 , since the photon´s angle would not be modified and therefore there would be no scattering.
    I have also done some graphs using Matlab and they show that θ ≠ ∏/2 and θ≠∏.
    I´m using radians.
    I have determined algebraically that tan(ψ/2)= sen (ψ/2)/cos(ψ/2). Therefore cos(ψ/2)≠0.
    ψ/2≠ ∏/2. So ψ≠∏. However I have heard about "backscattering" happening in the practice, so I´m a bit confused since the math shows it is not possible but yet it is.

    P.D. English is not my mother language so I apologize for any grammar or any other kind of mistake.
    Last edited: Apr 3, 2012
  2. jcsd
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