2026 Nobel Prize in Physics: Francis Halzen and the IceCube Neutrino Observatory

The 2026 Nobel Prize in Physics goes to Francis Halzen for his decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin.

The 2026 Nobel Prize in Physics has been awarded to Francis Halzen, professor at the University of Wisconsin–Madison, for his decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin.

Neutrinos are almost everywhere yet pass through Earth and our bodies unnoticed; only in extremely rare cases does a single neutrino interact with an atomic nucleus, leaving a detectable flash of light. Halzen first proposed in 1988 to capture neutrinos using the ice at the South Pole—deploying optical sensors throughout roughly a cubic kilometre of clear ice to track high-energy neutrinos from deep space.

Under his leadership, the IceCube observatory was completed in 2011, went on to detect the first high-energy neutrinos, and later confirmed that some originate outside our solar system. Mark Pearce, Chair of the Nobel Committee for Physics, said Halzen’s tenacity and scientific vision “paved the way for a new kind of astronomy.”

His tenacity and scientific vision paved the way for a new kind of astronomy.