Halzen wins 2026 Nobel Prize for South Pole neutrino detector — SkimNews
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- Francis Halzen of the University of Wisconsin–Madison won the 2026 Nobel Prize in Physics for his work spotting high-energy neutrinos using a detector at the South Pole, with the Nobel committee calling neutrinos "ghost-like messengers from the cosmos."
- Halzen first proposed in 1988 using Antarctic ice as a neutrino detector, then led an international collaboration of more than 450 people from 58 institutions in 14 countries to build the IceCube Neutrino Observatory.
- IceCube uses thousands of light sensors buried 2 kilometres under the Antarctic ice, detecting the blue Cherenkov radiation emitted when neutrinos interact with the ice — and was completed in 2010.
- IceCube detected its first high-energy extraterrestrial neutrinos in 2013, and in 2017 identified the first definitive source of a single high-energy cosmic neutrino — a blazar called TXS 0506+056 that fired a huge jet of energy toward Earth.
- IceCube in 2023 identified neutrinos originating from within the Milky Way itself, opening a new way to study our own galaxy without the interference of stronger extragalactic signals.
- Halzen calculated before construction that a 1-cubic-kilometre detector would catch roughly one neutrino per day — a gamble the Nobel committee noted "very few thought would work, including myself."
Why it matters: Halzen's 38-year bet transformed an unproven idea into a working observatory that has now identified specific cosmic accelerators — from a distant blazar to our own galaxy — giving physicists a new way to probe the high-energy universe that optical and radio telescopes cannot access.
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