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) 56Ni, (ii) light (Z = 30 - 45) neutron-rich nuclei, and (iii) light (Z ≤ 44) p-nuclei. We find that Ye,NSE > 0.49, Ye,NSE ≤ 0.45, and 0.45 < Ye,NSE ≤ 0.49 for winds of types (i), (ii), and (iii), respectively, where Ye,NSE is the electron fraction of the wind at T = 9 × 109K. The collasar winds may be a lighter element primary process, suggested from Galactic evolution of Sr, Y, and Zr. The p-nuclei, 92Mo and 94Mo, which are underproduced in oxygen layers in a supernova, can be abundantly synthesized in the collapsar winds.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics