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A: Fachverband Atomphysik

A 10: Precision Spectroscopy of Atoms and Ions I

A 10.2: Vortrag

Mittwoch, 10. März 2010, 11:00–11:15, F 107

Nuclear isotope implications on atomic parity-violation experiments with He-like ions — •Fabrizio Ferro^1,2, Anton Artemyev^1,2, and Andrey Surzhykov^1,2 — ¹Physikalisches Institut, Universität Heidelberg — ²GSI, Darmstadt

During the last two decades, atomic parity-violation (PV) studies with few-electron heavy ions have attracted much interest both in experiment and theory. For high-Z, helium-like ions, in particular, a number of experiments were proposed to measure the parity mixing between (almost degenerate) 2 ³P₀ and 2 ¹S₀ states. For example, Schäfer and co-workers [1] have suggested to apply very intense laser beams (of order 10²¹ W/cm²) in order to induce parity-violating 2E1 transition between these two levels. For the practical realization of such an experiment precise information is needed on the 2 ³P₀ - 2 ¹S₀ energy splitting. In this contribution, we performed a systematic study of the energy spectrum of helium-like ions with nuclear charges in the ranges 54<Z<71 and 88<Z<92, i.e. in the regions where PV effects are expected to be most significant. To this purpose, we adopted a relativistic many-body perturbation theory to all orders and included quantum electrodynamics (QED) corrections. Special attention in our study is paid to the isotope shifts of 2 ³P₀ and 2 ¹S₀ levels. Based on detailed calculations we show, for example, that by choosing appropriate isotopes one may tune the 2 ³P₀ - 2 ¹S₀ splitting in the working range of very high intensity lasers (e.g. PHELIX at GSI).

[1] A. Schäfer et al., Phys. Rev. A 40 (1989) 7362