| DATE: |
2003-12-16 16:00 - 17:00 |
| PLACE: |
Rm345 in Building No.4 |
| TITLE: |
Physics Seminar: Solar neutrino results from SNO salt phase [English] |
| CONTACT: |
Physics Seminar Organizer (T.Komatsubara) |
| SPEAKER: |
Yasuo Takeuchi (Kamioka Observatory, ICRR, Univ. of Tokyo) |
| LANGUAGE: |
English |
| URL: |
http://seminar.kek.jp/physics/ |
| ABSTRACT: |
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. |
