High-Frequency Region of the Spectrum of Electron and Positron Bremsstrahlung. II

Abstract

The high-frequency limit of the bremsstrahlung spectrum from very high energy electrons has been calculated exactly with numerical methods. It is found that, even in the heaviest elements, only the $s$- and $p$-state partial waves of the outgoing zero-energy electron contribute significantly to the cross section: For Th ($Z=90$) the $s$ state gives 56% of the total and the $p$ state 42%, while the $d$-state contribution is 2% and the $f$-state contribution 0.1%. It is also found that the $s$- and $p$-state cross sections are well represented by analytic expressions which we have given previously.