Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 23: Poster II
A 23.10: Poster
Donnerstag, 11. März 2010, 16:30–19:00, Lichthof
Angular and polarisation correlation in the two photon decay of He-like ions — •Thorsten Jahrsetz1,2, Filippo Fratini1,2, Andrey Surzhykov1,2, Thomas Stöhlker1,2, and Stefan Fritzsche2,3 — 1Physikalisches Institut, Heidelberg University, Germany — 2Gesellschaft für Schwerionenforschung (GSI), Darmstadt, Germany — 3University of Oulu, Finland
Studies on the two–photon transitions in atomic systems have a long tradition. While, however, investigations in the past dealt mainly with the decay of light atoms and ions, much of today’s interest is placed on the high–Z domain. For example, a series of experiments were performed recently at the GSI storage ring to explore the two–photon decay of helium–like uranium U90+ ions. Although until now these experiments were restricted to the total and energy–differential rates [1], the photon–photon angular and polarization correlations are likely to be observed in the future and will reveal important information on the relativistic, many–body and parity non–conservation phenomena in heavy atomic systems. In this contribution we present a theoretical analysis of the two–photon decay of helium–like ions with special emphasis on angular and polarization correlations between the emitted photons. In order to describe properly such correlations, we apply the density matrix approach and the second–order perturbation theory. Based on this formalism, detailed calculations are performed for the two–photon decay of 2 1S0, 2 3S1 and 2 3P0 states of helium–like xenon Xe52+, gold Au77+ and uranium U90+ ions.
[1] A. Kumar et.al., Eur. Phys. J Special Topics 169, 19 (2009).