(adsbygoogle = window.adsbygoogle || []).push({}); 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.

http://tinypic.com/view.php?pic=v4z2qf&s=5

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.

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# Homework Help: Undefined angles for Compton scattering

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