Nuclear Composition of Gamma-Ray Burst Fireballs

Details Nuclear Composition of Gamma-Ray Burst Fireballs Nuclear Composition of Gamma-Ray Burst Fireballs

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.1611b&link_type=abstract

American Astronomical Society, HEAD meeting #7, #16.11; Bulletin of the American Astronomical Society, Vol. 35, p.623

Astronomy and Astrophysics

Astronomy

Scientific paper

Three processes shape the nuclear composition of GRB fireballs: (1) neutronization in the central engine, (2) nucleosynthesis in the fireball as it expands and cools, and (3) spallation of nuclei in subsequent internal shocks. The fireballs have a neutron excess and a marginally successful nucleosynthesis. They are composed of free nucleons, α -particles, and deuterium. A robust result is the survival of a significant neutron component, which has important implications. Besides making the fireball an interesting source of multi-GeV neutrinos, the neutrons play a dramatic role in the explosion at radii R=1016}-10{17 cm and change the mechanism of the GRB afterglow emission.

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