Here, a measurement of electron antineutrino oscillation by the Daya Bay Reactor Neutrino Experiment is described in detail. Six 2.9-GWth nuclear power reactors of the Daya Bay and Ling Ao nuclear power facilities served as intense sources of ¯νe’s. Comparison of the ¯νe rate and energy spectrum measured by antineutrino detectors far from the nuclear reactors (~1500–1950 m) relative to detectors near the reactors (~350–600 m) allowed a precise measurement of ¯νe disappearance. More than 2.5 million ¯νe inverse beta-decay interactions were observed, based on the combination of 217 days of operation of six antineutrino detectors (December, 2011–July, 2012) with a subsequent 1013 days using the complete configuration of eight detectors (October, 2012–July, 2015). The ¯νe rate observed at the far detectors relative to the near detectors showed a significant deficit, R = 0.949 ± 0.002(stat) ± 0.002(syst). The energy dependence of ¯νe disappearance showed the distinct variation predicted by neutrino oscillation. Analysis using an approximation for the three-flavor oscillation probability yielded the flavor-mixing angle sin22θ13 = 0.0841 ± 0.0027(stat) ± 0.0019(syst) and the effective neutrino mass-squared difference of |Δm2ee| = (2.50 ± 0.06(stat) ± 0.06(syst)) × 10–3 eV2. Analysis using the exact three-flavor probability found Δm232 = (2.45 ± 0.06(stat) ± 0.06(syst)) × 10–3 eV2 assuming the normal neutrino mass hierarchy and Δm232 = (–2.56 ± 0.06(stat) ± 0.06(syst)) × 10–3 eV2 for the inverted hierarchy.
An, F. P., et al. "Measurement of electron antineutrino oscillation based on 1230 days of operation of the Daya Bay experiment." Physical Review. D., vol. 95, no. 7, Apr. 2017. https://doi.org/10.1103/PhysRevD.95.072006
An, F. P., Balantekin, A. B., Band, H. R., Bishai, M., Blyth, S., Cao, D., Cao, G. F., Cao, J., Cen, W. R., Chan, Y. L., Chang, J. F., Chang, L. C., Chang, Y., Chen, H. S., Chen, Q. Y., Chen, S. M., Chen, Y. X., Chen, Y., ... Zou, J. H. (2017). Measurement of electron antineutrino oscillation based on 1230 days of operation of the Daya Bay experiment. Physical Review. D., 95(7). https://doi.org/10.1103/PhysRevD.95.072006
An, F. P., Balantekin, A. B., Band, H. R., et al., "Measurement of electron antineutrino oscillation based on 1230 days of operation of the Daya Bay experiment," Physical Review. D. 95, no. 7 (2017), https://doi.org/10.1103/PhysRevD.95.072006
@article{osti_1354630,
author = {An, F. P. and Balantekin, A. B. and Band, H. R. and Bishai, M. and Blyth, S. and Cao, D. and Cao, G. F. and Cao, J. and Cen, W. R. and Chan, Y. L. and others},
title = {Measurement of electron antineutrino oscillation based on 1230 days of operation of the Daya Bay experiment},
annote = {Here, a measurement of electron antineutrino oscillation by the Daya Bay Reactor Neutrino Experiment is described in detail. Six 2.9-GWth nuclear power reactors of the Daya Bay and Ling Ao nuclear power facilities served as intense sources of ¯νe’s. Comparison of the ¯νe rate and energy spectrum measured by antineutrino detectors far from the nuclear reactors (~1500–1950 m) relative to detectors near the reactors (~350–600 m) allowed a precise measurement of ¯νe disappearance. More than 2.5 million ¯νe inverse beta-decay interactions were observed, based on the combination of 217 days of operation of six antineutrino detectors (December, 2011–July, 2012) with a subsequent 1013 days using the complete configuration of eight detectors (October, 2012–July, 2015). The ¯νe rate observed at the far detectors relative to the near detectors showed a significant deficit, R = 0.949 ± 0.002(stat) ± 0.002(syst). The energy dependence of ¯νe disappearance showed the distinct variation predicted by neutrino oscillation. Analysis using an approximation for the three-flavor oscillation probability yielded the flavor-mixing angle sin22θ13 = 0.0841 ± 0.0027(stat) ± 0.0019(syst) and the effective neutrino mass-squared difference of |Δm2ee| = (2.50 ± 0.06(stat) ± 0.06(syst)) × 10–3 eV2. Analysis using the exact three-flavor probability found Δm232 = (2.45 ± 0.06(stat) ± 0.06(syst)) × 10–3 eV2 assuming the normal neutrino mass hierarchy and Δm232 = (–2.56 ± 0.06(stat) ± 0.06(syst)) × 10–3 eV2 for the inverted hierarchy.},
doi = {10.1103/PhysRevD.95.072006},
url = {https://www.osti.gov/biblio/1354630},
journal = {Physical Review. D.},
issn = {ISSN 2470-0010},
number = {7},
volume = {95},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2017},
month = {04}}
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