Belgian-American physicist Francis Halzen, aged 82, was named as the recipient of the 2026 Nobel Prize in Physics on Tuesday in Stockholm. The award was given in recognition of his significant contributions to the IceCube Neutrino Observatory and the detection of high-energy neutrinos originating from astrophysical sources, as stated by the award committee. Situated at the Amundsen–Scott South Pole Station in Antarctica, the observatory was a result of Halzen’s realization that the ice at the South Pole could be utilized to track neutrinos, often referred to as “ghost particles” due to their ability to traverse Earth and living organisms without leaving a trace, with minimal interactions with matter.
Describing the neutrinos as cosmic messengers bringing information from the universe, Eva Olsson from the Royal Swedish Academy of Sciences highlighted their role in unveiling the mysteries of distant galaxies and the phenomena of exploding stars. The Nobel Physics Prize winners are chosen yearly by the Royal Swedish Academy of Sciences and are awarded a total of 12 million Swedish crowns ($1.7 million Cdn).
The IceCube Observatory, spanning an entire cubic kilometer, became operational in 2011, marking the realization of a vision that originated in the late 1980s. Halzen, expressing his gratitude to his collaborators over the years, admitted his initial doubts about the project’s success, underscoring the element of luck in its fruition. Affiliated with the University of Wisconsin–Madison for several decades, Halzen expressed his delight and surprise at the announcement while attending a conference in Italy.
Neutrinos, characterized as omnipresent and minuscule cosmic particles with infinitesimal mass, emit from celestial bodies like the sun, with trillions passing through human bodies every second. These elusive particles are detected indirectly through their interactions with matter, generating light flashes or charged particles upon collision.
Leading an international team of researchers and engineers, Halzen has provided a valuable tool for exploring the universe, according to Mark Pearce, the chair of the Nobel Committee for Physics. The planned extension of the observatory, IceCube-Gen2, covering eight cubic kilometers of ice and set to be operational in 2033, aims to enhance neutrino detection capabilities significantly.
Anticipating groundbreaking discoveries from his work, Halzen emphasized that the true potential and revelations about the universe are yet to be fully realized. Belgian Prime Minister Bart De Wever lauded Halzen’s dedication to unraveling cosmic secrets through his research on neutrinos. The Nobel Prize in Chemistry, literature, and peace will be announced in the coming days, with the economics prize scheduled for October 12.
Alfred Nobel, the Swedish chemist and entrepreneur who established the Nobel Prize, stipulated in his will that the prizes should reward those who have contributed most to humanity in the preceding year. The laureates receive their prizes on December 10, the anniversary of Nobel’s death.
