物理セミナー

日時: 2003-12-16 16:00 - 17:00
場所: 4号館 Rm345
会議名: 物理セミナー 「Solar neutrino results from SNO salt phase」 [英語]
連絡先: 物理セミナー係 (小松原)
講演者: Yasuo Takeuchi   (Kamioka Observatory, ICRR, Univ. of Tokyo)
講演言語: 英語
URL: http://seminar.kek.jp/physics/
アブストラクト: The Sudbury Neutrino Observatory (SNO) has precisely determined the total active (nu_x) 8B solar neutrino flux without assumptions about the energy dependence of the nu_e survival probability. The measurements were made with dissolved NaCl in the heavy water to enhance the sensitivity and signature for neutral-current interactions. The flux is found to be 5.21 +/- 0.27 (stat) +/- 0.38 (syst) x10^6 cm^{-2}s^{-1}, in agreement with previous measurements and standard solar models. A global analysis of these and other solar and reactor neutrino results yields Delta m^{2} = 7.1^{+1.2}_{-0.6}x10^{-5} ev^2 and theta = 32.5^{+2.4}_{-2.3} degrees. Maximal mixing is rejected at the equivalent of 5.4 standard deviations.

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