The detector status and physics prospects of JUNO experiment

Bei-Zhen Hu^1*, Yee Bob Hsiung¹

¹Physics Department, National Taiwan University, Taipei, Taiwan

* Presenter:Bei-Zhen Hu, email:ptbei1985@gmail.com

The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose neutrino experiment. The primary goal of JUNO experiment is to determine the neutrino mass hierarchy by measuring the fine structure of the oscillation spectrum with a significance of 3~4 σ in 6 years of data taking. Additionally, the experiment aims to precisely measure the mixing parameters: θ₁₂ , ∆m₁₂ and ∆m²_ee. Beyond these objectives, JUNO will also study geo-neutrinos, solar-neutrinos, atmospheric neutrinos, supernova neutrinos and neutrinos from dark matter annihilations.

JUNO is located in Jiangmen, Guangdong, China, with an overburden of about 700 meters. The baseline distance to the reactor antineutrinos from two nearby nuclear power plants is 53 km. The central detector consists of 20 kton liquid scintillator, a 35.4 m diameter acrylics sphere, a 40.1 m diameter stainless steel latticed shell, and an independent double calorimetry system. This system includes 17,612 20-inch large photomultiplier tubes (LPMTs) and 25,600 3-inch small photomultiplier tubes (SPMTs), providing a total photo-coverage of 78% and an energy resolution better than 3% at 1 MeV.

Construction of JUNO began in 2014. Currently, the acrylic sphere is complete, and the both LPMT and SPMT installation are nearly finished. The detector is preparing for liquid scintillator filling. This presentation will cover the physics prospects, detectors, and current status of JUNO.

Keywords: Neutrino Oscillation , Neutrino Mass Hierarchy, Neutrino