ULTRACOLD METASTABLE HELIUM-4 AND HELIUM-3GASES

摘要

We discuss our work to obtain a condensate containing more than 10' atoms and thefirst degenerate Fermi gas in a metastable state. Sympathetic cooling with Helium-4is used to cool 106 Helium-3 atoms to a temperature T/TF < 0.5. The ultracold bosonicand fermionic gases have been used to observe the Hanbury Brown and Twiss effectfor both isotopes, showing bunching for the bosons and antibunching for thefermions. A proposal for high resolution spectroscopy at 1.557 gm, connecting bothmetastable states directly, is discussed at the end.