Bose-Einstein condensation of lithium
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Bose-Einstein condensation of 7Li has been studied in a magnetically trapped gas. Because of the effectively attractive interactions between 7Li atoms, many-body quantum theory predicts that the occupation number of the condensate is limited to about 1400 atoms. We observe the condensate number to be limited to a maximum value between 650 and 1300 atoms. The measurements were made using a versatile phase-contrast imaging technique. We discuss our measurements, the current theoretical understanding of BEC in a gas with attractive interactions, and future experiments we hope to perform.
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Hulet, Randy G., Bradley, Curtis C. and Sackett, C. A.. "Bose-Einstein condensation of lithium." SPIE Proceedings, 2995, (1997) SPIE: 223-231. http://dx.doi.org/10.1117/12.273760.