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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.
Bradley et al. (1997) studied this question.