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https://hdl.handle.net/2440/129322
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dc.contributor.author | Aartsen, M.G. | - |
dc.contributor.author | Ackermann, M. | - |
dc.contributor.author | Adams, J. | - |
dc.contributor.author | Aguilar, J.A. | - |
dc.contributor.author | Ahlers, M. | - |
dc.contributor.author | Ahrens, M. | - |
dc.contributor.author | Alispach, C. | - |
dc.contributor.author | Andeen, K. | - |
dc.contributor.author | Anderson, T. | - |
dc.contributor.author | Ansseau, I. | - |
dc.contributor.author | Anton, G. | - |
dc.contributor.author | Argüelles, C. | - |
dc.contributor.author | Auffenberg, J. | - |
dc.contributor.author | Axani, S. | - |
dc.contributor.author | Backes, P. | - |
dc.contributor.author | Bagherpour, H. | - |
dc.contributor.author | Bai, X. | - |
dc.contributor.author | Balagopal V, A. | - |
dc.contributor.author | Barbano, A. | - |
dc.contributor.author | Barwick, S.W. | - |
dc.contributor.author | et al. | - |
dc.date.issued | 2020 | - |
dc.identifier.citation | Physical Review Letters, 2020; 125(12):121104-1-121104-10 | - |
dc.identifier.issn | 0031-9007 | - |
dc.identifier.issn | 1079-7114 | - |
dc.identifier.uri | http://hdl.handle.net/2440/129322 | - |
dc.description.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. | - |
dc.description.statementofresponsibility | M. G. Aartsen, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens ... et al. | - |
dc.language.iso | en | - |
dc.publisher | American Physical Society | - |
dc.rights | © 2020 American Physical Society | - |
dc.source.uri | http://dx.doi.org/10.1103/physrevlett.125.121104 | - |
dc.subject | IceCube Collaboration | - |
dc.title | Characteristics of the diffuse astrophysical electron and Tau neutrino flux with six years of IceCube high energy cascade data | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1103/PhysRevLett.125.121104 | - |
pubs.publication-status | Published | - |
Appears in Collections: | Aurora harvest 8 Physics publications |
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