Title: Double electron ionization in Compton scattering of high energy photons by helium atoms
Abstract: The cross section of double-electron ionization of two-electron atoms and ions in Compton scattering of high energy photons is calculated. It is demonstrated that its dependence on incoming photon frequency is the same as that for the single-electron ionization. The ratio of 'double-to-single' ionization in Compton scattering proved to be energy independent and almost coincides with the corresponding value for photoionization. For the He atom it is 1.68%. This surprising result deserves experimental verification.