Heidelberg 2015 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 17: Precision Measurements and Metrology IV (with Q)
A 17.3: Vortrag
Dienstag, 24. März 2015, 15:00–15:15, P/H1
Lifetime of the 5s4d 3D1 transition in neutral strontium — •Joshua Hughes1, Marco Menchetti1,2, Yeshpal Singh1, Kai Bongs1, Ian Hill2, Richard Hobson2,3, Anne Curtis2, Ross Williams2, and Patrick Gill2,3,4 — 1University of Birmingham, Birmingham, UK — 2National Physical Laboratory, Teddington, UK — 3Clarendon Laboratory, University of Oxford, Oxford, UK — 4Imperial College London, London, UK
Atomic clocks based on neutral strontium have now reached both accuracies and stabilities at the 10−18 level. The accuracy is currently limited by the uncertainty of the blackbody radiation (BBR) shift in neutral strontium at room temperature. Improved measurements of the strontium 5s4d 3D1 lifetime, which contributes to 98% of the uncertainty in the dynamic correction term to the BBR shift, will lead to a further reduction of the overall systematic uncertainty in room temperature strontium lattice clocks. I will present an update on the status of the strontium lattice clock at NPL as well as measurements we have made of the 3D1 state lifetime.