Nucleosynthesis inside supernova-driven supercritical accretion disks

We have investigated nucleosynthesis in a supercritical accretion disk arou nd a compact object of 1.4 M. using the self-similar solution of an optical ly thick advection dominated flow. Supercritical accretion is expected to o ccur in a supernova with fallback material accreting onto a new-born compac t object. It has been found that appreciable nuclear reactions take place e ven for a reasonable value of the viscosity parameter, alpha (vis) similar or equal to 0.01, when the accretion rate m(over dot) = Mc(2)/(16L(Edd)) > 10(5), where L-Edd is the Eddington luminosity. If m greater than or equal to 4 x 10(6), all heavy elements are destroyed to He-4 through photodisinte grations at the inner part of the disk. Even He-4 is also disintegrated to protons and neutrons near the inner edge when m greater than or equal to 2 x 10(7). If the fallback matter of the supernova explosion has the composit ion of a helium-rich layer of the progenitor, a considerable amount of Ti-4 4 could be ejected via a jet from the disk.