'Raymond Davis,Jr.'

Numéro d’image : 12000700
'Raymond Davis,Jr.'
Raymond Davis Jr.,Nobel Laureate and retired chemist at the U.S. Department of Energy's Brookhaven National Laboratory. Davis won the 2002 Nobel Prize in Physics for detecting solar neutrinos,ghostlike particles produced in the nuclear reactions that power the sun. He shared the prize with Masatoshi Koshiba of Japan,and Riccardo Giacconi of the U.S. Neutrinos are tiny,fast particles that pass through everything,even the earth,without slowing down. Davis was the first scientist to detect solar neutrinos,the signature of nuclear fusion reactions occurring in the core of the sun. Devising a method to detect solar neutrinos based on the theory that the elusive particles produce radioactive argon when they interact with a chlorine nucleus,Davis constructed his first solar neutrino detector in 1961,2,300 feet below ground in a limestone mine in Ohio. Building on this experience,he mounted a full-scale experiment 4,800 feet underground,in the Homestake Gold Mine in South Dakota. In research that spanned from 1967-1985,Davis consistently found only one-third of the neutrinos that standard theories predicted. His results
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