Francis Halzen wins Nobel for Antarctic IceCube neutrino observatory
Belgian-born physicist Francis Halzen has won the 2026 Nobel Prize in Physics for his decisive contributions to IceCube, a detector built into a cubic kilometre of Antarctic ice. The observatory detects high-energy neutrinos from space, giving researchers clues about extreme cosmic events that ordinary telescopes cannot readily observe.
Bottom line — IceCube’s neutrino detections opened a new field of astronomy, and Halzen says he is still working on a research proposal.
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The Nobel Committee said Halzen’s work helped establish the discovery of high-energy neutrinos of astrophysical origin.
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Halzen first presented the South Pole observatory concept in 1988; IceCube reached its full size in 2011, according to the Nobel Prize background.
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The Nobel Prize background says IceCube has 5,160 light sensors on 86 cables, installed 1,450 to 2,450 metres below the surface.
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The Nobel Prize background dates the first evidence for cosmic neutrinos to 2013; the research team said it had enough data to confirm the discovery a couple of years later.
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The Guardian reports that IceCube identified its first cosmic neutrino source, 3.7 billion years away.
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IFLScience reports that IceCube has detected neutrinos from the Milky Way and distant galaxies; it also says the observatory inspired underwater detectors, including the Mediterranean’s KM3NeT.