Speaker
Description
Jiangmen Underground Neutrino Observatory (JUNO) is a medium-baseline reactor neutrino experiment currently under construction in Jiangmen City in South China. The central detector (CD) is a 20 kton liquid scintillator (LS) neutrino target housed in an acrylic sphere of 35.4m in diameter, submersed in a cylindrical water Cherenkov veto detector of 43.5m in diameter and depth. The JUNO experimental hall is 52.5km away from both the Yangjiang and Taishan nuclear power plants and ~700m underground. JUNO’s CD will be equipped with 17,612 20-in photomultiplier tubes (PMTs) and 25,600 3-in PMTs, providing photocathode coverage of 75.2% and 2.7%, respectively. The water Cherenkov veto detector is equipped with 2,400 20-in PMTs. CD’s energy resolution is expected to be better than 3% at 1MeV and to have an absolute energy scale uncertainty better than 1% over the whole reactor antineutrino energy range. With such an unprecedented target mass and excellent energy resolution for a LS detector, JUNO’s main physics goals are to resolve neutrino mass ordering (NMO) and to measure 3 neutrino oscillation parameters with high precision. With 6 years of data, NMO is expected to be determined with a ~3σ significance and sub-half-percent precisions for 3 oscillation parameters: $\sin ^2 \theta_{12}$, $\Delta m^2_{21}$, and $|\Delta m^2_{32}|$. In addition to the main 20 kton LS detector, the JUNO experiment also has a satellite detector, Taishan Antineutrino Observatory (JUNO-TAO), which is ~30m away from the Taishan number one reactor. JUNO-TAO’s energy resolution is expected to be better than 2% at 1 MeV. Besides its main goals in neutrino oscillation physics, the JUNO experiment is also expected to have great physics reach with solar neutrinos, supernova neutrinos, geoneutrinos, atmospheric neutrinos, and searches for physics beyond the Standard Model such as nucleon decay. The detector construction is expected to be completed in 2023. In this talk, we will present the design of the JUNO detector system, its status, and the expected physics reach.
