Abstract
We investigate heavy element synthesis through thermally driven winds launched from an inner neutron-rich region of an accretion disk in a collapsar. Various heavy elements are found to be produced through the wind. There exist three types of winds characterized by their abundant nuclei: (i) 56 Ni, (ii) light ( Z = 30 − 45 ) neutron-rich nuclei, and (iii) light ( Z ⩽ 44 ) p-nuclei. We find that Y e , NSE > 0.49 , Y e , NSE ⩽ 0.45 , and 0.45 Y e , NSE ⩽ 0.49 for winds of types (i), (ii), and (iii), respectively, where Y e , NSE is the electron fraction of the wind at T = 9 × 10 9 K . The collasar winds may be a lighter element primary process, suggested from Galactic evolution of Sr, Y, and Zr. The p-nuclei, 92 Mo and 94 Mo, which are underproduced in oxygen layers in a supernova, can be abundantly synthesized in the collapsar winds.
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