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We report the first measurement of the odd-isotope fractions for barium,\fodd\, in two extremely metal-poor stars: a CEMP-r/s star \he\(\feh\,$=-2.42\pm0.11$) and an r-II star \cs\ (\feh\,$=-2.90\pm0.13$). Themeasured \fodd\ values are $0.23\pm0.12$ corresponding to $34.3\pm34.3$\% ofthe r-process contributions for \he\ and $0.43\pm0.09$ corresponding to$91.4\pm25.7$\% of the r-process contribution to Ba production for \cs. Thehigh r-process signature of barium in \cs\ ($91.4\pm25.7\%$) suggests that themajority of the heavy elements in this star were synthesised via an r-processpath, while the lower r-process value ($34.3\pm34.3\%$) found in \he\ indicatesthat the heavy elements in this star formed through a mix of s-process andr-process synthesis. These conclusions are consistent with studies based on AGBmodel calculations to fit their abundance distributions.

The odd-isotope fractions of Barium in CEMP-r/s star HE 0338-3945 and r-II star CS 31082-001