Speaker: Marco Tomaselli (TU Darmstadt)

A Dynamical Correlation Model for Nuclear and Atomic Physics

We study the structure of light nuclei through nuclear calculations and isotopic-shift evaluations in the framework of a dynamical correlation model (DCM). In nuclear calculations, this model takes into consideration the correlation between valence particles as well as between valence and core particles. We present the results obtained for charge radii of the lithium, berilium and uranium isotopes. We have also carried out isotopic-shift studies by applying the DCM to the electron subspace of these nuclei and calculating the field- and phase-shift, which characterize the isotopic-shift theory, in suitable electronic transitions. We have found that the DCM approach leads naturally to component of $e^-e^+$ pair in the three-electron wave functions of the lithium isotopes and in the two-electron wave funtions of the berillium isoptopes. It is well known that in the isotopic-shift theory the $e^-e^+$ pair contributes to isotopic-shift via the boiling of the QED vacuum mechanism. The apperance of the $e^-e^+$ pair demonstrates, therefore, the soundness of the physics principles of the DCM. Our calculated charge radii of the light isotopes represent our prediction for the experiments presently being performed at GSI. I will also discuss our proposed study of electron transitions in lithium-like uraninum, which can be done with the X-ray laser soon be available at the PHELIX petawatt laser at GSI.