Where Can I Find High-Energy Pair Production Differential Cross Sections?

[malawi_glenn]

Hi

I am looking for a source which covers a differential crossection for pair production of electrons and positrons due to photons.

$$\frac{d^2\sigma}{dEd\Omega}$$

I need it to be valid for high relativistic energies of electrons/positrons and for all angels. I can only find formulas which are valid for small opening angels :(

(Rev. Mod. Phys. 41, 581 - 639 (1969) Pair Production by Photons)

Thank you for your time

 

[malawi_glenn]

Hans Bethe - Phys Rev. 93 "Theory of Bremsstrahlung and Pair Production I. differential Cross Section"

:-)