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We present strontium, barium, carbon, and silicon isotopic compositions of 61acid-cleaned presolar SiC grains from Murchison. Comparison with previous datashows that acid washing is highly effective in removing both strontium andbarium contamination. For the first time, by using correlated$^{88}Sr$/$^{86}Sr$ and $^{138}Ba$/$^{136}Ba$ ratios in mainstream SiC grains,we are able to resolve the effect of $^{13}C$ concentration from that of$^{13}C$-pocket mass on s-process nucleosynthesis, which points towards theexistence of large $^{13}C$-pockets with low $^{13}C$ concentration in AGBstars. The presence of such large $^{13}$R-pockets with a variety of relativelylow $^{13}C$ concentrations seems to require multiple mixing processes inparent AGB stars of mainstream SiC grains.

Correlated Strontium and Barium Isotopic Compositions of Acid-Cleaned Single Silicon Carbides from Murchison