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Fig. A.4


Temporal evolution of the Li, Rb, Zr, and Tc abundances as predicted by the HBB-MLT 5 M model with a 13C-rich region (the 13C pocket) and a delayed superwind (Karakas et al. 2012). We include a 13C pocket by inserting protons into the top of the He-intershell (with a mass = 1 × 10-4  M) at the deepest extent of each TDU episode. We refer to Karakas et al. (2012) and Lugaro et al. (2012) for details of this procedure. Tc (also Zr although at a slower rate) is quickly produced by the 13C neutron source; log ε(Tc) > 0 at the beginning of the super Li-rich phase (log ε(Li) ~ 4). The evolution of Rb is not greatly affected by the inclusion of the 13C pocket, but Zr is more affected, being even more abundant than Rb during the super Li-rich phase. We note that the Tc abundance is an upper limit because the trend of the half-life of 99Tc, decreasing with the temperature, is not included. However, the difference would be very small because the 99Tc half-life changes only from terrestrial 0.22 Myr to 0.11 Myr at the temperature of 100 MK typical of the 13C pocket, which means that 99Tc behaves as a stable nucleus during this neutron flux.

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