STOCKHOLM/LONDON — A Japanese and a Canadian scientist won the 2015 Nobel Prize for Physics on Tuesday for discovering that elusive subatomic particles called neutrinos have mass, opening a new window onto the fundamental nature of the universe.Neutrinos are the second most bountiful particles after photons, which carry light, with trillions of them streaming through our bodies every second, but their true nature has been poorly understood.Takaaki Kajita and Arthur McDonald’s breakthrough was the discovery of a phenomenon called neutrino oscillation that has upended scientific thinking and promises to change understanding about the history and future fate of the cosmos.“It is a discovery that will change the books in physics, so it is really major discovery,” Barbro Asman, a Nobel committee member and professor of physics at Stockholm University, told Reuters.In awarding the prize, the Royal Swedish Academy of Sciences said the finding had “changed our understanding of the innermost workings of matter and can prove crucial to our view of the universe”.For many years, the central enigma with neutrinos was that up to two-thirds fewer of them were detected on Earth than expected, based on how many should be flooding through the cosmos from our Sun and other stars or left over from the Big Bang.Around the turn of the millennium, Kajita and McDonald, using different experiments, managed to explain this by showing that neutrinos actually changed identities, or “flavors”, and therefore must have some mass, however small.McDonald told a news conference in Stockholm by telephone that this not only gave scientists a more complete understanding of the world at a fundamental level but could also shed light on the science behind fusion power, which causes stars to shine and could one day be tapped as a source of electricity on Earth.“Yes, there certainly was a Eureka moment in this experiment when we were able to see that neutrinos appeared to change from one type to the other in traveling from the Sun to the Earth,” he said.NEW PHYSICSMcDonald is professor emeritus at Queen’s University in Canada, while Kajita is director of the Institute for Cosmic Ray Research at the University of Tokyo.“When I took the phone call and heard that they’d decided on the prize, it was a huge honor.
Nobel Prize Awarded For Solving Puzzle Of Ghostly Neutrino Particles
Local News from TheGazette.com, The Gazette (Cedar Rapids)
Tue, 10/06/2015 - 7:56am
Sections: u.s.
Topics: Iowa Linn County Cedar Rapids
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