Nucleosynthesis Inside Gamma-Ray Burst Accretion Disks

Details Nucleosynthesis Inside Gamma-Ray Burst Accretion Disks Nucleosynthesis Inside Gamma-Ray Burst Accretion Disks

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005omeg.conf..344f&link_type=abstract

ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2003. Held 17-19 November 2003 in RIKEN, Wako, Saitama, Japan. Edited by M Terasawa,

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We investigate nucleosynthesis inside both a gamma-ray burst accretion disk and a wind launched from an inner region of the disk using one-dimensional models of the disk and wind and a nuclear reaction network. Far from a central black hole, the composition of accreting gas is taken to be that of an O-rich layer of a massive star before core collapse. We find that the disk consists of five layers characterized by dominant elements: 16O, 28Si, 54Fe (and 56Ni), 4He, and nucleons, and the individual layers shift inward with keeping the overall profiles of compositions as the accretion rate decreases. 56Ni are abundantly ejected through the wind from the inner region of the disk with the electron fraction ≃ 0.5. In addition to iron group, elements heavier than Cu, in particular 63Cu and 64Zn, are massively produced through the wind. Various neutron-rich nuclei can be also produced in the wind from neutron-rich regions of the disk, though the estimated yields have large uncertainties.

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