Physics – Nuclear Physics
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..haw.cg007s&link_type=abstract
American Physical Society, 3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan, October 1
Physics
Nuclear Physics
Scientific paper
Observational evidence suggests that long-duration gamma-ray bursts (GRBs) are linked to the collapse of massive, rotating stars. One piece of this evidence is the observation of supernova light curves in the afterglow of a number of long-duration GRBs. Since the radioactive decay of Nickel-56 drives the light curves of ordinary core-collapse supernovae, long-duration GRBs must also copiously produce Nickel-56. This nickel may be produced in explosive burning, as in ordinary supernovae, or in outflows from the central object of the GRB---an accretion disk around a stellar-mass black hole. Here we examine the latter mechanism, by investigating outflows from a range of steady state accretion disk models. We find that significant amounts of Nickel-56 are produced over a wide range of disk and outflow parameter space. We discuss the influence of disk accretion rate, outflow entropy, outflow timescale, initial disk position, and neutrino-nucleon interactions on the mass fraction of Nickel-56 produced.
McLaughlin Gail
Sabbatino Nicole
Surman Rebecca
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