Hannover 2013 – scientific programme
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A: Fachverband Atomphysik
A 15: Precision spectroscopy of atoms and ions III (with Q)
A 15.2: Talk
Tuesday, March 19, 2013, 11:30–11:45, B 305
High-precision X-ray spectroscopy of highly charged ions with microcalorimeters — •Saskia Kraft-Bermuth1, Victor Andrianov2,3, Alexander Bleile2, Artur Echler2, Peter Egelhof2, Patrick Grabitz2, Stoyanka Ilieva2, Caroline Kilbourne4, Oleg Kiselev2, Dan McCammon5, Jan Meier2, and Pascal Scholz1 — 1Institut f. Atomphysik, Justus-Liebig-Universität, Gießen, Germany — 2Helmholtzzentrum f. Schwerionenforschung, Darmstadt, Germany — 3Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia — 4NASA/Goddard SFC, Greenbelt, USA — 5Dept. Physics, University of Wisconsin, Madison, USA
The precise determination of the energy of the Lyman-α lines in hydrogen-like heavy ions provides a sensitive test of quantum electrodynamics in very strong Coulomb fields. In 2010, a test array of 8 silicon thermistors with Sn and Pb absorbers was used in the first measurement of the Lyman-α energies of lead ions Pb81+ with a microcalorimeter at the Experimental Storage Ring (ESR) at GSI. The experimental result agreed well with the theoretical predictions. The overall uncertainty amounted to 26 eV. In 2012, a larger array of 32 silicon thermistors with Sn absorbers and an improved energy resolution was applied to measure the Lyman-α energies of gold ions Au78+. The systematic error of the measurement was reduced by using a new calibration source and an improved beam diagnostics. This contribution will present the results of this experiment. Perspectives for new applications at GSI as well as at the FAIR facility will be presented.