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We report the calculation of the interspecies scattering length for thesodium-rubidium (Na-Rb) system. We present improved hybrid potentials for thesinglet $X^1\Sigma^+$ and triplet $a^3\Sigma^+$ ground states of the NaRbmolecule, and calculate the singlet and triplet scattering lengths $a_{s}$ and$a_{t}$ for the isotopomers $^{23}$Na$^{87}$Rb and $^{23}$Na$^{85}$Rb. Usingthese values, we assess the prospects for producing a stable two-speciesBose-Einstein condensate in the Na-Rb system.Comment: v2: report correct units in Table captions, fix error in conclusions  for $^{23}$Na$^{85}$Rb TBEC. Otherwise, more concise presentation, typos  fixed. 6 pages, 1 figur

Calculation of the interspeciess-wave scattering length in an ultracold Na-Rb vapor