Nucleosynthesis of Nickel-56 from Gamma-Ray Burst Accretion Disks

Details Nucleosynthesis of Nickel-56 from Gamma-Ray Burst Accretion Disks Nucleosynthesis of Nickel-56 from Gamma-Ray Burst Accretion Disks

2011-12-12

arxiv.org/abs/1112.2673v1

Astrophysical Journal, Vol. 743, p. 155 (2011)

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

10 pages, 9 figures

Scientific paper

We examine the prospects for producing Nickel-56 from black hole accretion disks, by examining a range of steady state disk models. We focus on relatively slowly accreting disks in the range of 0.05 - 1 solar masses per second, as are thought to be appropriate for the central engines of long-duration gamma-ray bursts. We find that significant amounts of Nickel-56 are produced over a wide range of parameter space. We discuss the influence of entropy, outflow timescale and initial disk position on mass fraction of Nickel-56 which is produced. We keep careful track of the weak interactions to ensure reliable calculations of the electron fraction, and discuss the role of the neutrinos.

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