论文“收割机”？地下700米的大国重器建设成功

Core Insights - The Jiangmen Underground Neutrino Observatory (JUNO) has successfully completed its construction and released its first physical results after 59 days of operation, achieving a measurement precision of 1.5 to 1.8 times better than previous best results for two key solar neutrino oscillation parameters [1][3] Group 1: Experimental Achievements - The JUNO experiment confirmed the "solar neutrino anomaly" by measuring the oscillation parameters through reactor neutrinos, which had previously shown inconsistencies with solar neutrino measurements [3] - The experiment is the first of its kind to be built as a next-generation large-scale, high-precision neutrino facility, with key performance indicators meeting or exceeding design expectations [3][4] Group 2: Technical Specifications - The core detector of JUNO consists of a liquid scintillator with an effective mass of 20,000 tons, located in a water pool 44 meters underground, supported by a stainless steel structure with a diameter of 41.1 meters [4] - The detector includes 20,000 20-inch photomultiplier tubes and 25,000 3-inch photomultiplier tubes, along with advanced electronic systems and low-background materials [4]