Abstract

RENO (Reactor Experiment for Neutrino Oscillation) is the first reactor neutrino experiment which began data-taking in 2011 with two identical near and far detectors in Yonggwang, Korea. Using 1500 live days of data, sin22θ13 and |Δm2ee| are updated using spectral measurements: sin22θ13 = 0.086 ± 0.006 (stat.) ± 0.005 (syst.) and |Δm2ee| = 2.61+015-016 (stat.) ± 0.09 (syst.) (×10−3 eV2). The correlation between the 5 MeV excess rate and the reactor thermal power is again clearly observed with the increased data set.

Highlights

  • Neutrino oscillation is well known and proven

  • RENO Experimental Setup and Data Set RENO is located in the southwest region of South Korea where there is a commercial nuclear reactor power plant consisting of six reactor cores which produce total 16.8 GW thermal power in full operation mode

  • RENO near detector is built under a small hill with 120 (450) m.w.e. overburden that has 290 (1380) m baseline from the center of the linear array of the six reactors

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Summary

Introduction

Neutrino oscillation is well known and proven. All three neutrino mixing angles and two mass square differences in the PMNS matrix are measured. 3. Event Selection and Remaining Background A reactor neutrino arriving at detector can interact with a free proton in target or γ-catcher and produces a positron and a neutron if the neutrino energy is greater than 1.8 MeV. Event Selection and Remaining Background A reactor neutrino arriving at detector can interact with a free proton in target or γ-catcher and produces a positron and a neutron if the neutrino energy is greater than 1.8 MeV In this Inverse Beta Decay (IBD) process a positron annihilates immediately and produces a prompt signal while a neutron needs to be thermalized until it is captured by either Gd or Hydrogen and produces a delayed signal. The average delay time is about 30 (180) μs for n-Gd (n-H) In this analysis only IBD n-Gd events are selected to get cleaner sample of signal neutrino events among accidental, fast neutron, 9Li/8He backgrounds.

Detector Selected candidate events
Total background
Results
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