Evidence for a Spectral Break or Curvature in the Spectrum of Astrophysical Neutrinos from 5 TeV to 10 PeV

We report improved measurements of the all flavor astrophysical neutrino spectrum with IceCube by combining complementary neutrino samples in two independent analyses. Both analyses show evidence of a harder spectrum at energies below $\sim$30~TeV compared to higher energies where the spectrum is well characterized by a power law. The spectrum is better described by a log parabola or a broken power law, the latter being the preferred model. Both, however, reject a single power law over an energy range 5~TeV-10~PeV with a significance $>4σ$, providing new constraints on properties of cosmic neutrino sources.

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Publication Details

Journal
Physical Review Letters
Published
2025-11-12
DOI
https://doi.org/10.1103/2gh9-d4q7
Citations
2
Primary Topic
Astrophysics and Cosmic Phenomena
Type
article
Field-Weighted Citation Impact
3.74
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article

Evidence for a Spectral Break or Curvature in the Spectrum of Astrophysical Neutrinos from 5 TeV to 10 PeV

Karl J. Friston
2 citations
Physical Review Letters
Astrophysics and Cosmic Phenomena
3.74
article

Evidence for a Spectral Break or Curvature in the Spectrum of Astrophysical Neutrinos from 5 TeV to 10 PeV

Karl J. Friston
article en
2 citations

Abstract

We report improved measurements of the all flavor astrophysical neutrino spectrum with IceCube by combining complementary neutrino samples in two independent analyses. Both analyses show evidence of a harder spectrum at energies below $\sim$30~TeV compared to higher energies where the spectrum is well characterized by a power law. The spectrum is better described by a log parabola or a broken power law, the latter being the preferred model. Both, however, reject a single power law over an energy range 5~TeV-10~PeV with a significance $>4σ$, providing new constraints on properties of cosmic neutrino sources.

Physical Review LettersVol. 136(12)
Karlsruhe Institute of Technology (DE), Marquette University (US), University of Geneva (CH), Uppsala University (SE), University of Copenhagen (DK), Georgia Institute of Technology (US), Pennsylvania State University (US), Université Libre de Bruxelles (BE), University of Nevada, Reno (US), Vrije Universiteit Brussel (BE), University of Wisconsin–Madison (US), University of Padua (IT), University of Kansas (US), University of Alaska Anchorage (US), Lawrence Berkeley National Laboratory (US), University of Alberta (CA), Chiba University (JP), Stockholm University (SE), University of Wuppertal (DE), University of Alabama (US), Simon Fraser University (CA), Friedrich-Alexander-Universität Erlangen-Nürnberg (DE), South Dakota School of Mines and Technology (US), University of Canterbury (NZ), Loyola University Chicago (US), Johannes Gutenberg University Mainz (DE), TU Dortmund University (DE), Queen's University (CA), University of Utah (US), University of Münster (DE), Mercer University Health Sciences Center (US), Harvard University Press (US), Deutsches Elektronen-Synchrotron DESY (DE), University of California System (US), Yale University (US), Humboldt-Universität zu Berlin (DE), University of Oxford (GB), Institute of Particle Physics (CA), The Ohio State University (US), University of Rochester (US), The University of Adelaide (AU), Stony Brook University (US), Technical University of Munich (DE), Massachusetts Institute of Technology (US), University of Maryland, College Park (US), Chung-Ang University (KR), Drexel University (US), Southern University (BD), Columbia University (US), Sungkyunkwan University (KR), University of Delaware (US), Michigan State University (US), RWTH Aachen University (DE), Ruhr University Bochum (DE), UCLouvain (BE)
Openalex Percentile: Top 6%
Astrophysics and Cosmic Phenomena
3.74
DOIOpen Access PDFOpenAlex
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