The Nobel Prize in Physics 2015 Photo © Takaaki Kajita Takaaki Kajita Prize share: 1/2 Photo: K. MacFarlane. Queen's University /SNOLAB Arthur B. McDonald Prize share: 1/2 The Nobel Prize in Physics 2015 was awarded jointly to Takaaki Kajita and Arthur B. McDonald "for the discovery of neutrino oscillations, which shows that neutrinos have mass"