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      An absence of neutrinos associated with cosmic-ray acceleration in γ-ray bursts

      IceCube Collaboration
      Nature
      Springer Science and Business Media LLC

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          Abstract

          Very energetic astrophysical events are required to accelerate cosmic rays to above 10(18) electronvolts. GRBs (γ-ray bursts) have been proposed as possible candidate sources. In the GRB 'fireball' model, cosmic-ray acceleration should be accompanied by neutrinos produced in the decay of charged pions created in interactions between the high-energy cosmic-ray protons and γ-rays. Previous searches for such neutrinos found none, but the constraints were weak because the sensitivity was at best approximately equal to the predicted flux. Here we report an upper limit on the flux of energetic neutrinos associated with GRBs that is at least a factor of 3.7 below the predictions. This implies either that GRBs are not the only sources of cosmic rays with energies exceeding 10(18) electronvolts or that the efficiency of neutrino production is much lower than has been predicted.

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          Most cited references17

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          High Energy Neutrinos from Cosmological Gamma-Ray Burst Fireballs

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            Cosmological Gamma-Ray Bursts and the Highest Energy Cosmic Rays

            Eli Waxman (1995)
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              The Acceleration of Ultra--High-Energy Cosmic Rays in Gamma-Ray Bursts

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                Author and article information

                Journal
                Nature
                Nature
                Springer Science and Business Media LLC
                0028-0836
                1476-4687
                April 2012
                April 18 2012
                April 2012
                : 484
                : 7394
                : 351-354
                Article
                10.1038/nature11068
                22517161
                82dfe494-db5a-4301-becf-7c859d915a37
                © 2012

                http://www.springer.com/tdm

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