Nobel Prize in Physics awarded to Francis Halzen for groundbreaking work on cosmic neutrinos

The Nobel Prize in Physics 2026 has been awarded to Francis Halzen for “decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin," the Royal Swedish Academy of Sciences announced on Tuesday.Francis Halzen is a Belgian-American physicist and professor at the University of Wisconsin–Madison, where he has been a leading figure in neutrino physics.Born in Tienen, Belgium, in 1944, Halzen has played a central role in the development of the IceCube Neutrino Observatory at the South Pole, a massive detector designed to study elusive neutrinos. His work helped establish the detection of high-energy neutrinos originating from astrophysical sources, opening a new way of observing and studying the universe.Halzen was instrumental in recognising that the enormous volume of transparent Antarctic ice could serve as a detector for the fleeting flashes produced when high-energy neutrinos interact with matter. He developed the concept of embedding thousands of light sensors deep in the ice to identify and reconstruct these rare interactions. This approach ultimately became IceCube, enabling researchers to trace high-energy neutrinos back to astrophysical sources and use them as messengers from distant cosmic environments. His work helped establish neutrino astronomy as a new way of studying the universe.The Nobel Prize in Physics was one of the prizes established in Alfred Nobel's will in 1895. Nobel dedicated one part of his fortune to the person who had made the “most important discovery or invention within the field of physics”.The prize is awarded by the Royal Swedish Academy of Sciences in Stockholm. It was first awarded in 1901.Through 2025, the Physics prize had been awarded 119 times to 230 laureates, including five women. The 2026 Nobel Prize comes with 12 million Swedish kronor, to be shared if there is more than one laureate.The youngest Physics laureate is Lawrence Bragg, who was 25 when he won the prize in 1915. The oldest is Arthur Ashkin, who was 96 when he received the award in 2018. Other prominent winners include Albert Einstein who was awarded in 1921 while John Bardeen was the only person to receive it twice.Meawnhile, last year John Clarke, Michel H Devoret and John M Martinis won the Physics Nobel “for the discovery of macroscopic quantum mechanical tunnelling and energy quantisation in an electric circuit”.You use AI every day. Now get your AI Quotient. Take the AIQ test.