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

Document Type

Article

Publication Date

2026

Publisher

American Physical Society

Source Publication

Physical Review Letters

Source ISSN

0031-9007

Original Item ID

DOI: 10.1103/2gh9-d4q7

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  ∼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  >4⁢𝜎, providing new constraints on properties of cosmic neutrino sources.

Comments

Physical Review Letters, Vol. 136, No. 12 (2026). DOI.

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