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We calculate and discuss the light element freeze-out nucleosynthesis in highentropy winds and fireballs for broad ranges of entropy-per-baryon, dynamictimescales characterizing relativistic expansion, and neutron-to-proton ratios.With conditions characteristic of Gamma Ray Bursts (GRBs) we find thatdeuterium production can be prodigious, with final abundance values 2H/Happroximately 2%, depending on the fireball isospin, late time dynamics, andthe effects of neutron decoupling- induced high energy non-thermal nuclearreactions. This implies that there potentially could be detectable localenhancements in the deuterium abundance associated with GRB events.Comment: 14 pages 3 figure

Light‐Element Synthesis in High‐Entropy Relativistic Flows Associated with Gamma‐Ray Bursts