The Nobel committee awarded Francis Halzen the 2026 Physics Prize on Oct. 6 for decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos from astrophysical sources.
IceCube’s 1-cubic-kilometer detector in Antarctic ice made those findings possible by capturing rare neutrino interactions and tracing their paths through Cherenkov light flashes.
Those measurements opened neutrino astronomy beyond the solar system and galaxy, helping researchers probe distant sources such as black holes, supernovas and quasars with signals less distorted than photons.
The prize extends a long Nobel thread in neutrino physics, following awards in 2002 for cosmic neutrinos and in 2015 for neutrino oscillations, while plans for an 8-cubic-kilometer IceCube Gen2 point to the field’s next step.