The Royal Swedish Academy of Sciences cited as its rationale the “decisive contributions” to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin, according to the South China Morning Post.
The reference to the IceCube observatory places the award in the field of neutrino research, while the rationale cited by the Academy specifically refers to their astrophysical origin.
Halzen was born in Belgium, as reported by the South China Morning Post in its account of the award.
The scientist is affiliated with the University of Wisconsin–Madison in the United States, according to the same source.
The physics prize was presented as the second Nobel Prize of the 2026 season, based on information reported by the South China Morning Post.
The award to Halzen was identified as the winner of the 2026 Nobel Prize in Physics by The Japan Times, the South China Morning Post and France 24.