Abstract

The Compton scattering of a high energy photon by a helium-like ion, followed bythe ionization of two electrons, is considered outside of the Bethe surface ofCompton scattering with the knock-out of a single electron. The role ofshake-off (SO), of final state interactions (FSI) and of the quasi-free mechanism(QFM) is analysed. The triple and double differential distributions are calculated.It is demonstrated for the first time that in certain kinematical regions the processis dominated by the FSI and by the QFM, while the SO contribution is muchsmaller.

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