The first experimental confirmations of this were made by Louis Gray, and studies of it by Chung-yao Chao led to the discovery of the positron.
The Meitner-Hupfeld effect is a deviation from this formula in heavy elements. The first experimental confirmations of this were made by Louis Gray, and studies of it by Chung-yao Chao led to the discovery of the positron. Mathematically, one side of it can be expressed as the product of the fine structure constant, Compton radius, and several terms containing the ratio of the photon energy before and after collisions, and, for low energies, it reduces to the classical Thomson equation. For 10 points, identify this formula that was the first experimental proof for Dirac's relativistic electron theory, which gives the differential cross section of a photon scattered by an unbound electron.
The Meitner-Hupfeld effect is a deviation from this formula in heavy elements.
Klein-Nishina formula