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https://hdl.handle.net/2440/129322
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Type: | Journal article |
Title: | Characteristics of the diffuse astrophysical electron and Tau neutrino flux with six years of IceCube high energy cascade data |
Author: | Aartsen, M.G. Ackermann, M. Adams, J. Aguilar, J.A. Ahlers, M. Ahrens, M. Alispach, C. Andeen, K. Anderson, T. Ansseau, I. Anton, G. Argüelles, C. Auffenberg, J. Axani, S. Backes, P. Bagherpour, H. Bai, X. Balagopal V, A. Barbano, A. Barwick, S.W. et al. |
Citation: | Physical Review Letters, 2020; 125(12):121104-1-121104-10 |
Publisher: | American Physical Society |
Issue Date: | 2020 |
ISSN: | 0031-9007 1079-7114 |
Statement of Responsibility: | M. G. Aartsen, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens ... et al. |
Abstract: | We report on the first measurement of the astrophysical neutrino flux using particle showers (cascades) in IceCube data from 2010-2015. Assuming standard oscillations, the astrophysical neutrinos in this dedicated cascade sample are dominated (∼90%) by electron and tau flavors. The flux, observed in the sensitive energy range from 16 TeV to 2.6 PeV, is consistent with a single power-law model as expected from Fermi-type acceleration of high energy particles at astrophysical sources. We find the flux spectral index to be γ=2.53±0.07 and a flux normalization for each neutrino flavor of ϕ_{astro}=1.66_{-0.27}^{+0.25} at E_{0}=100 TeV, in agreement with IceCube's complementary muon neutrino results and with all-neutrino flavor fit results. In the measured energy range we reject spectral indices γ≤2.28 at ≥3σ significance level. Because of high neutrino energy resolution and low atmospheric neutrino backgrounds, this analysis provides the most detailed characterization of the neutrino flux at energies below ∼100 TeV compared to previous IceCube results. Results from fits assuming more complex neutrino flux models suggest a flux softening at high energies and a flux hardening at low energies (p value ≥0.06). The sizable and smooth flux measured below ∼100 TeV remains a puzzle. In order to not violate the isotropic diffuse gamma-ray background as measured by the Fermi Large Area Telescope, it suggests the existence of astrophysical neutrino sources characterized by dense environments which are opaque to gamma rays. |
Keywords: | IceCube Collaboration |
Rights: | © 2020 American Physical Society |
DOI: | 10.1103/PhysRevLett.125.121104 |
Published version: | http://dx.doi.org/10.1103/physrevlett.125.121104 |
Appears in Collections: | Aurora harvest 8 Physics publications |
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