Speaker
Description
RENO has been taking data since August, 2011 and successfully measured the smallest neutrino mixing angle, theta13. The measured value is obtained from the observed reactor anti-neutrino events with neutron captures on gadolinium (n-Gd) in the target detector region. The experiment has also measured the mixing angle using an independent sample of neutron captures on hydrogen (n-H). Because of a large accidental background in the n-H sample, an improved technique has been developed to make an effective removal of the background. For example, flashing PMTs make a contribution to an accidental background against a reactor neutrino signal. By effective removing the flashing events, we can make better extraction of the n-H reactor antineutrino signal.
In particular, the (n-H) analysis utilizes events in both target and gamma-catcher and thus obtains a larger reactor antineutrino sample, twice more than that of (n-Gd). This independent measurement provides an important cross-check on the systematic uncertainties of the n-Gd theta13 measurement.
In this talk, we will present a new measurement of theta13 using 2800 days of n-H data.
| Collaboration | RENO |
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