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Measurement of the energy spectrum with IceCube-79: IceCube Collaboration
M G Aartsen1, M Ackermann2, J Adams3
12Department of Physics, University of Adelaide, Adelaide, 5005 Australia.
The European Physical Journal. C, Particles and Fields
|January 31, 2020
Summary
Researchers used the IceCube neutrino observatory to analyze muon neutrino interactions. The study found an excess of high-energy neutrinos compared to atmospheric models, consistent with astrophysical sources.
Area of Science:
- Neutrino astronomy
- Particle astrophysics
- High-energy physics
Background:
- The IceCube Neutrino Observatory at the South Pole detects high-energy neutrinos.
- Understanding the origin of these neutrinos is crucial for particle astrophysics.
Purpose of the Study:
- To measure the energy spectrum of muon neutrinos using IceCube data.
- To compare the measured spectrum with atmospheric neutrino flux models and astrophysical neutrino measurements.
Main Methods:
- Data collected from IceCube's 79-string configuration.
- Machine learning techniques for selecting a high-purity sample (99.5%) of muon neutrino charged-current interactions.
- Energy spectrum unfolding using the Truee software.
Main Results:
- The neutrino energy spectrum was determined over four orders of magnitude (125 GeV to 3.2 PeV).
- An excess of neutrinos was observed in four energy bins above 125 GeV compared to the Honda atmospheric neutrino flux model.
- The measured spectrum aligns with previous atmospheric neutrino measurements and IceCube's astrophysical neutrino flux data.
Conclusions:
- The observed neutrino spectrum provides valuable data for understanding high-energy cosmic rays.
- The results support the existence of astrophysical neutrino sources contributing to the observed flux.
- Further analysis can refine our understanding of neutrino interactions and cosmic phenomena.
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