Related Experiment Video
Updated: Sep 9, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Characterization of the Three-Flavor Composition of Cosmic Neutrinos with IceCube
R Abbasi1, M Ackermann2, J Adams3
1Department of Physics, Loyola University Chicago, Chicago, Illinois 60660, USA.
Abstract:
The flavor composition of cosmic neutrinos probes both the physical properties of their sources and oscillations over energies and distances unreachable by terrestrial experiments. Using 11.4 yr of IceCube data, we analyze the flavor composition of the all-sky neutrino flux from 5 TeV-10 PeV, significantly lowering the analysis threshold from a previous minimum of 35 TeV. The best-fit flavor fractions are f_{e},f_{μ},f_{τ}=0.30_{-0.15}^{+0.20}, 0.37_{-0.16}^{+0.14}, 0.33_{-0.25}^{+0.24}. For the first time, we report that neutrinos of all three flavors are present in the observed cosmic neutrino flux at >90% confidence level. We infer the flavor composition at their sources, finding good agreement with pion decay while pure neutron decay is disfavored, with posterior probability 2.7×10^{-5} (∼4σ).
More Related Videos
Related Concept Videos
Phase Transitions: Melting and Freezing
Atomic Nuclei: Nuclear Spin State Population Distribution
Atomic Radii and Effective Nuclear Charge
Fermi Level Dynamics
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
¹³C NMR: ¹H–¹³C Decoupling
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Heat Capacities of an Ideal Gas III

