NIntegrate error while finding fully differential cross section

HI everyone
I work on my project in field of ionization of li by scattering. I write the code for finding fully differential cross section and my code has some problem that i couldnt find it .please correct my code please.

You assign a value to KfDke and then you use Kfdke in one place.
You have ;; at the end of one line that should be one ;

Thanks for your help