Abstract. In this article we review our recent experiments with a 40 K-87 Rb mixture. We demonstrate rapid sympathetic cooling of a 40 K-87 Rb mixture to dual quantum degeneracy on an atom chip. We also provide details on efficient BEC production, species-selective magnetic confinement, and progress toward integration of an optical lattice with an atom chip. The efficiency of our evaporation allows us to reach dual degeneracy after just 6 s of evaporation -more rapidly than in conventional magnetic traps. When optimizing evaporative cooling for efficient evaporation of 87 Rb alone we achieve BEC after just 4 s of evaporation and an 8 s total cycle time.
The nucleus of 229 Thorium presents a unique isomer state of very low energy and long lifetime, current estimates are around 7.8 eV and seconds to hours respectively. This nuclear transitions therefore is a promising candidate for a novel type of frequency standard and severly groups worldwide have set out to investigate this system. Our aim is to construct a "solid state nuclear clock", i.e. a frequency standard where Thorium ions are implanted into Calciumfluoride crystals transparent in vacuum ultraviolet range. As a first step towards an accurate determination of the exact energy and lifetime of this isomer state we perform low-resolution fluorescent spectroscopic measurements.
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