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University of Wisconsin-Madison physicist Francis Halzen has received the 2026 Nobel Prize in Physics for his work on astrophysical neutrinos, built around the IceCube Neutrino Observatory he helped develop beneath Antarctic ice. IceCube uses thousands of light sensors in a cubic kilometer of ice to detect neutrinos and has traced them back to cosmic sources such as supermassive black holes.
The Royal Swedish Academy of Sciences awarded the 2026 Nobel Prize in Physics to Francis Halzen of the University of Wisconsin, Madison, for his role in building the IceCube Neutrino Observatory in Antarctica and detecting high-energy neutrinos originating beyond our galaxy. Halzen, speaking by phone from Italy at a Stockholm news conference, said he was surprised by the honor and credited the many researchers who joined his project.
Physicist Francis Halzen has been awarded the 2026 Nobel Prize in Physics for founding the IceCube Neutrino Observatory and for discovering high-energy neutrinos originating from deep space. IceCube, built below the Antarctic ice, detects rare interactions between neutrinos and atoms, capturing particles emitted by cosmic events like supernovae and gamma-ray bursts. Halzen noted the project succeeded within two years of operation, despite initial skepticism from the physics community.
Francis Halzen has been awarded the 2026 Nobel Prize in Physics for leading development of IceCube, the cubic-kilometre neutrino detector at the South Pole. The observatory achieved a landmark result in 2017 by tracing a high-energy neutrino back to a blazar, marking the first confirmed source identification of its kind and advancing 'multi-messenger' astronomy, which combines neutrinos, cosmic rays, light and gravitational waves to study cosmic events.
Physicist Francis Halzen received the 2026 Nobel Prize in Physics for establishing the IceCube Neutrino Observatory and discovering high-energy neutrinos originating from space. The award was announced on October 6 by the Royal Swedish Academy of Sciences, with Halzen emphasizing the collaborative effort behind the project. Neutrinos, abundant yet elusive particles, are key to understanding energetic cosmic events, and IceCube’s location at the South Pole enables unique astrophysical insights.