Belgian American physicist, Francis Halzen, aged 82, has been named the recipient of the 2026 Nobel Prize in Physics in Stockholm. The prestigious award recognizes his significant contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin, as stated by the award committee. Situated at the Amundsen–Scott South Pole Station in Antarctica, the observatory was pivotal in Halzen’s realization that ice at the South Pole could be utilized to track neutrinos, also known as “ghost particles” for their unique ability to traverse the Earth and matter without leaving a trace.
Eva Olsson from the Royal Swedish Academy of Sciences described neutrinos as messengers conveying information from the cosmos, shedding light on distant galaxies and the processes of exploding stars. The Nobel Physics Prize, with a total prize money of 12 million Swedish crowns ($1.7 million Cdn), is awarded annually by the Royal Swedish Academy of Sciences.
The IceCube, covering an entire cubic kilometer, became operational in 2011, culminating from a vision initiated in the late 1980s for the South Pole observatory. Halzen expressed gratitude towards his collaborators over the years, emphasizing the initial skepticism surrounding the project’s success.
Affiliated with the University of Wisconsin–Madison for several decades, Halzen expressed his delight and surprise at the announcement, coinciding with his attendance at a conference in Italy. In a nod to his groundbreaking work, Halzen was previously dubbed “Neutrino Man” by the U.S.-based Smithsonian magazine in 2014.
Neutrinos, omnipresent cosmic particles with minuscule mass, emanate from celestial bodies like the sun, with trillions passing through our bodies every second. Scientists leverage interactions between neutrinos and matter to study these elusive particles, generating flashes of light or charged particles as indicators.
Halzen led an international team of researchers and engineers in studying a rare group of neutrinos deemed cosmic messengers, offering insights into the universe’s evolution. Mark Pearce, chair of the Nobel Committee for Physics, commended Halzen’s scientific vision and tenacity, paving the way for a new era in astronomy.
Plans are underway for an extension to the observatory, IceCube-Gen2, which will cover eight cubic kilometers of ice and is projected to be operational by 2033. This extension aims to detect ten times more neutrinos, including weaker ones, expanding the scope of research into the universe’s mysteries.
Belgian Prime Minister Bart De Wever extended congratulations to Halzen, acknowledging his life’s dedication to unraveling the cosmos’ secrets through its most minute manifestations. The Swedish academy recognized the discovery of neutrino oscillations in 2015, with Canadian scientist Dr. Arthur McDonald sharing the Nobel physics prize that year.
The Nobel Prize in Chemistry, literature, peace, and economics will be announced subsequently. Instituted by Alfred Nobel, the prizes are bestowed upon individuals who have made significant contributions benefiting humankind. The laureates will receive their awards on December 10, the anniversary of Nobel’s passing.