Show that the energy distribution of particles recoiling from an elastic collision is always directly proportional to

Question:

Show that the energy of particles recoiling from an elastic collision is always directly proportional to the differential scattering cross section in the SM system.
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...