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We consider vacuum polarization effects in the one-photon annihilation channel within a kinetic description of the e − e + plasma produced from the vacuum in the focal spot of counter-propagating laser beams. This entails essential changes in the structure of the photon kinetic equation. We investigate the domain of large adiabaticity parameters γ ≫ 1 where the photon radiation turns out to be very small. A more thorough examination of the domain γ 1 needs separate investigation. However, an exploratory study has shown that the one-photon annihilation channel can lead for some domains of laser field parameters (e.g., for the XFEL) to contributions accessible for observation.

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We consider deuteron formation in heavy ion collisions at intermediate energies. The elementary reaction rates (N d → N N N etc.) in this context are calculated using rigorous Faddeev methods. To this end an in-medium Faddeev equation that consistently includes the energy shift and Pauli blocking effects has been derived and solved numerically. As a first application we have calculated the life-time of deuteron fluctuations for nuclear densities and temperatures typical for the final stage of heavy ion collisions. We find substantial differences between using the isolated and the in-medium rates. * Work supported by the Deutsche Forschungsgemeinschaft. † Talk presented by M. Beyer.