Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Superconductivity: Cryodetectors
TT 7.4: Vortrag
Montag, 31. März 2014, 10:15–10:30, HSZ 03
High-precision X-ray spectroscopy of highly-charged ions with silicon microcalorimeters — •Saskia Kraft-Bermuth1, Victor Andrianov2,3, Alexander Bleile2, Artur Echler1,2, Peter Egelhof2, Patrick Grabitz2, Caroline Kilbourne4, Oleg Kisselev2, Dan McCammon5, 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
High-precision X-ray spectroscopy of highly-charged ions provides a sensitive test of quantum electrodynamics in very strong Coulomb fields. Silicon microcalorimeters with absorbers of lead and tin have been applied in two experiments for the determination of the 1s Lamb shift in hydrogen-like lead and gold at the Experimental Storage Ring (ESR) at GSI. The experimental results agree well with theoretical predictions. The obtained uncertainty is comparable to conventional detection techniques. Further improvement may be obtained, in addition to an improved detector setup, by using decelerated beams at the socalled CRYRING and HITRAP facilities currently under construction at GSI. This talk will present the results of the ESR experiments and discuss perspectives for experiments at CRYRING and HITRAP as well as for experiments at the future FAIR facility, with a focus on detector development and technical challenges.