Liu, NanNanLiuGallino, RobertoRobertoGallinoCRISTALLO, SergioSergioCRISTALLOBisterzo, SaraSaraBisterzoDavis, Andrew M.Andrew M.DavisTrappitsch, RetoRetoTrappitschNittler, Larry R.Larry R.Nittler2020-09-252020-09-2520180004-637Xhttp://hdl.handle.net/20.500.12386/27486We compare updated Torino postprocessing asymptotic giant branch (AGB) nucleosynthesis model calculations with isotopic compositions of mainstream SiC dust grains from low-mass AGB stars. Based on the data-model comparison, we provide new constraints on the major neutron source, <SUP>13</SUP>C(α, n)<SUP>16</SUP>O in the He-intershell, for the s-process. We show that the literature Ni, Sr, and Ba grain data can only be consistently explained by the Torino model calculations that adopt the recently proposed magnetic-buoyancy-induced <SUP>13</SUP>C-pocket. This observation provides strong support to the suggestion of deep mixing of H into the He-intershell at low <SUP>13</SUP>C concentrations as a result of efficient transport of H through magnetic tubes.STAMPAenArticle10.3847/1538-4357/aad9f32-s2.0-85054839099000445964000012https://iopscience.iop.org/article/10.3847/1538-4357/aad9f32018ApJ...865..112LFIS/05 - ASTRONOMIA E ASTROFISICA