Spectral Measurement of the Electron Antineutrino Oscillation Amplitude and Frequency using 500 Live Days of RENO Data
| Autor: | S. Y. Kim, Y. C. Lee, I. T. Lim, H. S. Kim, J. S. Jang, R. G. Park, M. Y. Pac, Y. G. Seon, W. Kim, J. H. Choi, S. B. Kim, J. Y. Kim, J. Y. Yang, J. H. Yang, B. R. Kim, Dae Hoon Lee, S. H. Seo, K. K. Joo, W. Q. Choi, H. Seo, C. D. Shin, Y. Choi, I. S. Yeo, E. Kwon, H. I. Jang, J. S. Park, I. G. Park, I. Yu |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Particle physics Physics - Instrumentation and Detectors 010308 nuclear & particles physics FOS: Physical sciences Reactor Experiment for Neutrino Oscillation Instrumentation and Detectors (physics.ins-det) 01 natural sciences Spectral line High Energy Physics - Experiment Nuclear physics High Energy Physics - Experiment (hep-ex) 0103 physical sciences Ratio measurement 010306 general physics Neutrino oscillation Electron neutrino Oscillation amplitude |
| Zdroj: | Physical Review |
| Popis: | The Reactor Experiment for Neutrino Oscillation (RENO) has been taking electron antineutrino ($\overline{\nu}_{e}$) data from the reactors in Yonggwang, Korea, using two identical detectors since August 2011. Using roughly 500 live days of data through January 2013 we observe 290,775 (31,514) reactor $\overline{\nu}_{e}$ candidate events with 2.8 (4.9)% background in the near (far) detector. The observed visible positron spectra from the reactor $\overline{\nu}_{e}$ events in both detectors show discrepancy around 5 MeV with regard to the prediction from the current reactor $\overline{\nu}_{e}$ model. Based on a far-to-near ratio measurement using the spectral and rate information we have obtained $\sin^2 2 \theta_{13} = 0.082 \pm 0.009({\rm stat.}) \pm 0.006({\rm syst.})$ and $|\Delta m_{ee}^2| =[2.62_{-0.23}^{+0.21}({\rm stat.})_{-0.13}^{+0.12}({\rm syst.})]\times 10^{-3}$eV$^2$. Comment: 24 pages, 30 figures. Submitted to PRD. Total detection efficiency change from 76.44% to 76.47%. Some modifications of text to improve readability and clarification of the paper |
| Databáze: | OpenAIRE |
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