A new measurement.of t.e react.r ant.neut.ino flux and energy spect.um by t.e Daya Bay react.r neut.ino experiment.is report.d. t.e ant.neut.inos were generat.d by six 2.9 GWt. nuclear react.rs and det.ct.d by eight.a...
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A new measurement.of t.e react.r ant.neut.ino flux and energy spect.um by t.e Daya Bay react.r neut.ino experiment.is report.d. t.e ant.neut.inos were generat.d by six 2.9 GWt. nuclear react.rs and det.ct.d by eight.ant.neut.ino det.ct.rs deployed in t.o near(560 m and 600 m flux-weight.d baselines) and one far(1640 m flux-weight.d baseline) underground experiment.l halls. Wit. 621 days of dat., more t.an 1.2 million inverse bet. decay(IBD) candidat.s were det.ct.d. t.e IBD yield in t.e eight.det.ct.rs was measured, and t.e rat.o of measured t. predict.d flux was found t. be 0.946±0.020(0.992±0.021) for t.e Huber+mueller(ILL+Vogel) model. A 2.9σ deviat.on was found in t.e measured IBD posit.on energy spect.um compared t. t.e predict.ons. In part.cular, an excess of event. in t.e region of 4–6 MeV was found in t.e measured spect.um, wit. a local significance of 4.4σ. A react.r ant.neut.ino spect.um weight.d by t.e IBD cross sect.on is ext.act.d for model-independent.predict.ons.
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