| DATE: |
2012-05-17 15:30 - 16:30 |
| PLACE: |
Seminar Hall at Building No.3 1st floor |
| TITLE: |
Physics seminar/ Observation of the last, weakest neutrino transformation at RENO |
| CONTACT: |
Takasumi Maruyama |
| SPEAKER: |
Prof. Soo-Bong Kim (SNU) |
| LANGUAGE: |
English |
| ABSTRACT: |
The RENO experiment has observed the disappearance of reactor
electron antineutrinos, consistent with neutrino oscillations,
with a significance of 4.9 standard deviations. Antineutrinos
from six reactors at Yonggwang Nuclear Power Plant in Korea, are
detected by two identical detectors located at 294 m and 1383 m,
respectively, from the reactor array center. In the 229 day
data-taking period of 11 August 2011 to 26 March 2012, the far
(near) detector observed 17102 (154088) electron antineutrino
candidate events with a background fraction of 5.5% (2.7%). A
ratio of observed to expected number of antineutrinos in the far
detector is 0.920+-0.009(stat.)+-0.014(syst.). From the deficit,
we find sin^2(2theta_13)=0.113+-0.013(stat.)+-0.019(syst,) based
on a rate-only analysis. In this talk, we will describe experimental
setup, data taking, data analysis, and results for the measurement
of theta_13. |
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