From Daya Bay experiment to Jiangmen Underground Neutrino Observatory experiment

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Currently, the neutrino oscillation phenomenon is of research interest in particle physics. The discovery of the neutrino oscillation phenomenon confirmed that neutrinos have a minute mass, which is an important way to explore new physics beyond the standard model. The Daya Bay reactor neutrino experiment is an underground experiment that studies short-baseline reactor neutrino oscillations. It uses the far and near-identical detectors to reduce the detector uncertainty and the reactor neutrino expected flux uncertainty to measure the anti-neutrino rate and energy spectrum. The Daya Bay experiment released the latest neutrino oscillation parameters $\sin^{2}2\theta_{13}$ and $|\Delta$$m^{2}_{32}|$ in 2018, which used 1958 days of data. The $\sin^{2}2\theta_{13}$ had the highest measurement precision to date, which reached 3.4$%$, and the precision of $|\Delta$$m^{2}_{32}|$ was 2.8$%$, which was comparable with that of the accelerator-based experiments, such as MINOS, No$\nu$A and T2K. The accurate measurement of $\theta_{13}$ will be helpful to the next-generation of neutrino experiments that will determine the neutrino mass ordering and measure the CP-violating phase. Jiangmen Underground Neutrino Observatory (JUNO) is a multipurpose neutrino experiment that is under construction. The main scientific aim of JUNO is to determine the neutrino mass ordering by measuring the neutrino energy spectrum with a resolution of 3$%$ at 1 MeV and a $~\ge$ 1$%$ energy linearity. The neutrino mass ordering can be measured with a significance 3–4$\sigma$ based on six years of data that has been collected. In addition, JUNO will make a significant contribution to the precise measurement of neutrino oscillation parameters and the study of supernova neutrinos, solar neutrinos, atmospheric neutrinos, geoneutrinos, and nucleon decay.