  We investigate nucleosynthesis inside the outflows from gamma-ray burst (GRB)
accretion disks formed by the Type II collapsars. In these collapsars, massive
stars undergo core collapse to form a proto-neutron star initially and a mild
supernova explosion is driven. The supernova ejecta lack momentum and
subsequently this newly formed neutron star gets transformed to a stellar mass
black hole via massive fallback. The hydrodynamics and the nucleosynthesis in
these accretion disks has been studied extensively in the past. Several heavy
elements are synthesized in the disk and much of these heavy elements are
ejected from the disk via winds and outflows. We study nucleosynthesis in the
outflows launched from these disks by using an adiabatic, spherically expanding
outflow model, to understand which of these elements thus synthesized in the
disk survive in the outflow. While studying this we find that many new elements
like isotopes of titanium, copper, zinc etc. are present in the outflows. 56Ni
is abundantly synthesized in most of the cases in the outflow which implies
that the outflows from these disks in a majority of cases will lead to an
observable supernova explosion. It is mainly present when outflow is considered
from the He-rich, 56Ni/54Fe rich zones of the disks. However, outflow from the
Si-rich zone of the disk remains rich in silicon. Although, emission lines of
many of these heavy elements have been observed in the X-ray afterglows of
several GRBs by Chandra, BeppoSAX, XMM-Newton etc., Swift seems to have not
detected these lines yet.
