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Atmospheric and astrophysical Neutrinos above 1 TeV Interacting in IceCube

Publication: Research - peer-reviewJournal article

Documents

M.G. Aartsen, M. Ackermann, J. Adam, J.A. Aguilar, M. Ahlers, M. Ahrens, D. Altmann, T. Anderson, T.C. Arlen, C. Arguelles, David Jason Koskinen, Morten Ankersen Medici, Subir Sarkar, Michael James Larson, Michael Marc Wolf

The IceCube Neutrino Observatory was designed primarily to search for high-energy (TeV-PeV) neutrinos produced in distant astrophysical objects. A search for ≳100  TeV neutrinos interacting inside the instrumented volume has recently provided evidence for an isotropic flux of such neutrinos. At lower energies, IceCube collects large numbers of neutrinos from the weak decays of mesons in cosmic-ray air showers. Here we present the results of a search for neutrino interactions inside IceCube’s instrumented volume between 1 TeV and 1 PeV in 641 days of data taken from 2010–2012, lowering the energy threshold for neutrinos from the southern sky below 10 TeV for the first time, far below the threshold of the previous high-energy analysis. Astrophysical neutrinos remain the dominant component in the southern sky down to a deposited energy of 10 TeV. From these data we derive new constraints on the diffuse astrophysical neutrino spectrum, Φ_ν=2.06_{-0.3}^{+0.4}×10-18(E_ν/10^5  GeV)^{-2.46±0.12} GeV^-1 cm^−2 sr^−1 s^-1 for 25  TeV
Original languageEnglish
Article number022001
JournalPhysical Review D (Particles, Fields, Gravitation and Cosmology)
Volume91
Number of pages18
ISSN1550-7998
DOIs
StatePublished - 5 Jan 2015

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