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Thursday,
08 May 2025 |
Video-Recording for any system with MP4-support - Video.mp4 (ca. 456 Mb) |
15:15 – 16:25 |
"IceCube: The First Decade of Neutrino Astronomy
and Neutrino Physics"
Speaker: Prof. Francis Halzen
(Wisconsin)
Abstract:
Below the geographic South Pole, the
IceCube project has transformed one cubic kilometer of natural Antarctic ice
into a neutrino detector. IceCube detects
more than 100,000 neutrinos per year in
the GeV to 10 PeV energy range
providing an opportunity to test their
3-flavor scenario at extreme energies and baselines . Among those, we have
isolated a flux of high-energy neutrinos
originating beyond our Galaxy, with an
energy flux that is comparable to that
of the extragalactic high-energy photon
flux observed by the NASA Fermi satellite. With a decade of data, we have
identified their first sources, which point to supermassive black holes at the
centers of active galaxies as the origin of
high-energy neutrinos and high-energy
cosmic rays. We recently also observed neutrinos originating in our own Milky
Way which is, interestingly, not a
prominent feature in the neutrino sky.
About the Speaker:
Francis Halzen is the principal
investigator of IceCube, Vilas Research Professor
and Gregory Breit Professor at the
University of Wisconsin-Madison, and a theoretician studying problems that span
the particle physics, astrophysics and cosmology communities. In 1987, Halzen
started working on the AMANDA experiment, a first-generation neutrino telescope
at the South Pole that
represented a proof of concept for the
IceCube Neutrino Observatory.
Halzen also serves on various advisory
committees and review panels for
astroparticle physics research and
experiments.