Multi-GeV neutrinos from internal dissipation in gamma-ray burst fireballs

P. Mészáros, M. J. Rees

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Subphotospheric internal shocks and transverse differences of the bulk Lorentz factor in relativistic fireball models of gamma-ray bursts (GRBs) lead to neutron diffusion relative to protons, resulting in inelastic nuclear collisions. This results in significant fluxes of νμ(ν̄μ) of ∼3 GeV and νe(ν̄e) of ∼2 GeV, scaling with the flow Lorentz factor η < ηπ ∼ 400. This extends significantly the parameter space for which neutrinos from inelastic collision are expected, which in the absence of the above effects requires values in excess of ηπ. A model with sideways diffusion of neutrons from a slower wind into a fast jet can lead to production of νμ(ν̄μ) and νe(ν̄e) in the range 2-25 GeV or higher, depending on the value of η. The emission from either of these mechanisms from GRBs at redshifts z ∼ 1 may be detectable in suitably densely spaced detectors.

Original languageEnglish (US)
Pages (from-to)L5-L8
JournalAstrophysical Journal
Issue number1 PART 2
StatePublished - Sep 20 2000

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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