The Resolution to the Solar Neutrino Problem: Evidence for Neutrino Oscillation from SNO and KamLAND

par Fairouz Ohlsson-Malek

jeudi 6 févr. 2003, 00:00 → 00:00 Europe/Paris

Grand amphi (LPSC)

Karsten M Heeger, LBL USA: The Sudbury Neutrino Observatory (SNO), a 1,000 tonne heavy-water-based underground neutrino experiment, uses neutrinos from the 8B decay in the Sun to search for neutrino flavor change by comparing one neutrino reaction sensitive only to solar electron neutrinos and others sensitive to all active neutrino types. SNO's measurement provides direct evidence for the flavor transformation of solar neutrinos and indicates that neutrinos have mass. This observation explains the long-standing Solar Neutrino Problem, the deficit of the electron solar neutrino flux compared to solar model calculations. Recently, the KamLAND reactor neutrino experiment demonstrated for the first time anti-neutrino disappearance at long baselines. This result combined with previous solar neutrino experiments is evidence for neutrino oscillation. Results from SNO and KamLAND will be presented along with their implications for neutrino physics.