Neutrino Background Flux from Sources of Ultrahigh-Energy Cosmic-Ray Nuclei - Astrophysics > High Energy Astrophysical PhenomenaReport as inadecuate




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Abstract: Motivated by Pierre Auger Observatory results favoring a heavy nuclearcomposition for ultrahigh-energy UHE cosmic rays, we investigate implicationsfor the cumulative neutrino background. The requirement that nuclei not bephotodisintegrated constrains their interactions in sources, therefore limitingneutrino production via photomeson interactions. Assuming a $dN { mCR}-dE { m CR} \propto E { m CR}^{-2}$ injection spectrum andphotodisintegration via the giant dipole resonance, the background flux ofneutrinos is lower than $E u^2 \Phi u \sim {10}^{-9} { m GeV} { mcm}^{-2} { m s}^{-1} { m sr}^{-1}$ if UHE nuclei ubiquitously survive intheir sources. This is smaller than the analogous Waxman-Bahcall flux for UHEprotons by about one order of magnitude, and is below the projected IceCubesensitivity. If IceCube detects a neutrino background, it could be due to othersources, e.g., hadronuclear interactions of lower-energy cosmic rays; if itdoes not, this supports our strong restrictions on the properties of sources ofUHE nuclei.



Author: Kohta Murase, John F. Beacom

Source: https://arxiv.org/







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