Utilisateur:Dfeldmann/brouillon8
⇐ brouillon précédent Ceci est un brouillon de travail ; prière de ne pas le modifier ⇒ brouillon suivant
The IceCube collaboration has published flux limits for neutrinos from point sources, gamma-ray bursts, and neutralino annihilation in the Sun, with implications for WIMP–proton cross section.
A shadowing effect from the Moon has been observed.Cosmic ray protons are blocked by the Moon, creating a deficit of cosmic ray shower muons in the direction of the Moon. A small (under 1%) but robust anisotropy has been observed in cosmic ray muons.
In November 2013 it was announced that IceCube had detected 28 neutrinos that likely originated outside the Solar System and among those a pair of high energy neutrinos in the peta-electron volt range, making them the highest energy neutrinos discovered to date. The pair were nicknamed "Bert" and "Ernie", after characters from the Sesame Street TV show. Later in 2013 the number of detection increased to 37 candidates including a new high energy neutrino at 2000-TeV given the name of "Big Bird".
IceCube measured 10–100 GeV atmospheric muon neutrino disappearance in 2014, using three years of data taken May 2011 to April 2014, including DeepCore, determining neutrino oscillation parameters ∆m232 = 2.72+0.19
−0.20 × 10−3 eV2and sin2(θ23) = 0.53+0.09
−0.12 (normal mass hierarchy), comparable to other results. The measurement was improved using more data in 2017, and in 2019 atmospheric tau neutrino appearance was measured. The latest measurement with improved detector calibration and data processing from 2023 has resulted in more precise values of the oscillation parameters, determining ∆m232 = (2.41 ± 0.07) × 10−3 eV2 and sin2(θ23) = 0.51 ± 0.05 (normal mass hierarchy).
In July 2018, the IceCube Neutrino Observatory announced that they had traced an extremely-high-energy neutrino that hit their detector in September 2017 back to its point of origin in the blazar TXS 0506 +056 located 5.7 billion light-years away in the direction of the constellation Orion, the results had a statistical significance of 3-3.5σ. This was the first time that a neutrino detector had been used to locate an object in space, and indicated that a source of cosmic rays had been identified.
In 2020, evidence of the Glashow resonance at 2.3σ (formation of the W boson in antineutrino-electron collisions) was announced.
In February 2021, the tidal disruption event (TDE) AT2019dsg was reported as candidate for a neutrino source and the TDE AT2019fdr as a second candidate in June 2022.
In November 2022, IceCube announced strong evidence of a neutrino source emitted by the active galactic nucleus of Messier 77. It is the second detection by IceCube after TXS 0506+056, and only the fourth known source including SN1987A and solar neutrinos. OKS 1424+240 and GB9 are other possible candidates.
In June 2023 IceCube identified as a galactic map the neutrino diffuse emission from the Galactic plane at the 4.5σ level of significance.