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Neutron-capture nucleosynthesis in the He-flash convective zone in extremely metal-poor stars

Nishimura, Takanori*; Iwamoto, Nobuyuki  ; Suda, Takuma*; Aikawa, Masayuki*; Fujimoto, Masayuki*; Iben, I. Jr.*

We investigated the progress of nucleosynthesis in the helium flash driven convective zone which triggers the mixing of hydrogen into this convective zone in the extremely metal-poor, asymptotic giant branch stars with low and intermediate masses. The amounts of $$^{13}$$C created by proton captures on abundant $$^{12}$$C in He layer strongly depend on the resultant abundances of nuclei. We showed that under circumstances initially devoid of metals, the heavy $$s$$-process elements such as Sr, Ba and even Pb can be formed with light elements as seeds which are produced via two neutron-recycling reactions ($$^{12}$$C(n,$$gamma$$)$$^{13}$$C($$alpha$$,n)$$^{16}$$O and $$^{16}$$O(n,$$gamma$$)$$^{17}$$O($$alpha$$,n)$$^{20}$$Ne).



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