ULTRACOLD METASTABLE HELIUM-4 AND HELIUM-3 GASES
W. Vassen, T. Jeltes, J. M. MCNAMARA +10 more
We discuss our work to obtain a condensate containing more than 107 atoms and the first degenerate Fermi gas in a metastable state. Sympathetic cooling with Helium-4 is used to cool 106 Helium-3 atoms to a temperature T/TF < 0.5. The ultracold bosonic and fermionic gases have been used to observe the Hanbury Brown and Twiss effect for both isotopes, showing bunching for the bosons and antibunching for the fermions. A proposal for high resolution spectroscopy at 1.557 μm, connecting both metastable states directly, is discussed at the end.
Laser Spectroscopy•Apr 1, 2008•1 citation