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## Main Question or Discussion Point

I'm trying to figure our the relation between cross section, scattering angle and KE?

I'm doing a few exercises where I've been given kientic energy and scattering angle and have to calculate the cross section. Cross section is in units of Barns (m

I'm doing a few exercises where I've been given kientic energy and scattering angle and have to calculate the cross section. Cross section is in units of Barns (m

^{2}), and KE is 1/2 kg*m^{2}*s^{-2}, but I can't seem to derive an equation. Any help would be much appreciated.