[Sbs] Fwd: Jefferson Lab Colloquium - Francis Halzen

[Arun Tadepalli]

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From: JLab Communications Office <JLAB_Communications-office at jlab.org>
Subject: Jefferson Lab Colloquium - Francis Halzen
Date: April 11, 2025 at 10:00:14 AM EDT
To: <arunts at jlab.org>
Reply-To: JLab Communications Office <JLAB_Communications-office at jlab.org>

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Wednesday, April 23, 2025
3:30-4 p.m. for refreshments - 4-5 p.m. for the presentation
CEBAF Center Auditorium
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Abstract: Below the geographic South Pole, the IceCube project has transformed 1 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 three-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.


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Biography: 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 Antarctic Muon And Neutrino Detector Array (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.

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For questions about the Jefferson Lab Colloquium series, contact Susan Drewery<mailto:sdrewery at jlab.org>.

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