Jiangmen Underground Neutrino Observatory (JUNO): on the way to physics data

Abstract

The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kton liquid scintillator experiment under construction in South China, at Kaiping, Jiangmen, Guandong province. Its primary physics goals are the determination of the neutrino mass ordering and the precise determination of the neutrino oscillation parameters by means of the accurate measurement of the oscillated spectrum of antineutrinos emitted by two reactor complexes, Taishan and Yangjiang, located at 53 km distance from the experiment. Given its dimensions and anticipated performance, JUNO has a very rich physics program which includes the study of neutrinos from the Sun, the Earth, the Galaxy, and eventually from Supernovae, and will give important contributions to the study of new physics processes. The JUNO collaboration plans to finish the detector construction by the end of 2023. In this paper I review the detector progress and the updated sensitivities on the main physics channels.

Feasibility and physics potential of detecting 8B solar neutrinos at JUNO *

“…The expected signal rate in the full energy range is 4.15 (4.36) counts per day per kt (cpd/kt) for eV . A simplified detector response model, including the light output nonlinearity of the LS from Daya Bay [35] and the 3%/ energy resolution, is applied to the kinetic energy of the recoil electron, resulting in the visible energy . To calculate the fiducial volumes, the ES reaction vertex is also smeared by a 12 cm/ resolution.…”

“…For electrons with energies larger than 2 MeV, the nonlinear relationship between the LS light output and the deposited energy is less than 1%. Moreover, electrons from the cosmogenic B decays, with an average energy of 6.4 MeV, can set strong constraints on the energy scale, as was done at Daya Bay [35] and Double Chooz [65]. Thus, a 0.3% energy scale uncertainty is used in this analysis, following the results in Ref.…”

“…Thus, a 0.3% energy scale uncertainty is used in this analysis, following the results in Ref. [35]. Three analyses are reported based on these inputs.…”