![]() So if you send the light into a metal where the electrons can go back and forth, the electrons are just going to go up and down and up and down and up and down with the electric field associated with that electromagnetic wave. When light has a very very very large wavelength, it behaves like a wave. They really, like really does behave like a particle, sometimes. Compton scattering is another one of those really important events that happened at the beginning of the 20th century that indicated that photons were real. The positron will typically annihilate with an electron producing two annihilation photons of energy me (0.So let's talk about Compton scattering.The electron will typically be absorbed in a detector.2me (1.022 MeV) of the photon’s energy goes into creating the electron and positron.In the case of the nuclear field and for large photon energies, the mean scattering angle of the electron and positron is.Usually we don’t distinguish between the source of the field.In order to account for pair production from the Coulomb field of atomic electrons, Z2 is replaced by Z(Z+1) approximately since the cross section is smaller by a factor of Z.Above some photon energy (say > 1 GeV), spair becomes a constant.In the Born approximation (which is not very accurate for low energy or high Z) one finds. ![]()
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