Francis Halzen wins Nobel Prize in Physics for work on ‘ghost particles’

Belgian physicist Francis Halzen has been awarded the 2026 Nobel Prize in Physics for his pivotal role in constructing the IceCube Neutrino Observatory in Antarctica. This observatory tracks neutrinos, also known as "ghost particles," originating from deep space. The Royal Swedish Academy of Sciences recognized Halzen for his work in building the detector, which captures the faint light emitted when neutrinos interact with ice. Scientists believe these interactions provide crucial information about the evolution of the universe and potentially reveal new phenomena. Halzen proposed the IceCube project in 1988, recognizing the Antarctic ice's potential as a detector for these elusive particles that pass through matter unimpeded.

Physicist Prof Francis Halzen has been awarded the Nobel Prize for his pioneering work on an observatory that detects neutrinos from space. These elusive "ghost particles" are detected by observing the faint blue glow they produce when interacting with atomic nuclei in Antarctic ice. Halzen's innovative idea was to embed thousands of light sensors deep within a vast natural ice sheet at the geographic South Pole, creating the IceCube Observatory. This observatory's immense volume of clear ice is necessary due to the rarity of neutrino interactions. Neutrinos are valuable cosmic messengers because their lack of charge and weak interaction allow them to travel unimpeded through dense regions, pointing directly to their origins and carrying information about high-energy cosmic events like exploding stars and black holes.