中国江门中微子实验发布首个成果 高精度证实暗示新物理的偏差

Core Insights - The Jiangmen Neutrino Experiment has successfully constructed its facility and released its first physical results, confirming the "solar neutrino anomaly" with high precision, suggesting potential new physics beyond the standard model [1][3]. Group 1: Experiment Overview - The Jiangmen Neutrino Experiment, located 700 meters underground, has captured over 2,300 neutrinos from August 26 to November 2, 2025, achieving a measurement precision of the "solar neutrino oscillation parameters" that is 1.5 to 1.8 times better than previous experiments [3][5]. - The experiment aims to resolve the inconsistency in the measurement of mass-squared differences between solar and reactor neutrinos, known as the "solar neutrino anomaly," which indicates the possibility of new physics [3][5]. Group 2: Technical Achievements - After over a decade of design and construction, the Jiangmen Neutrino Experiment has become the world's first next-generation large-scale, high-precision neutrino experiment, with key performance indicators meeting or exceeding design expectations [5][6]. - The core detector, a liquid scintillator with an effective mass of 20,000 tons, is housed in a 44-meter deep water pool, featuring a 41.1-meter diameter stainless steel support structure and various critical components, including 20-inch and 3-inch photomultiplier tubes [6]. Group 3: Historical Context - The concept for the Jiangmen Neutrino Experiment was proposed by the Institute of High Energy Physics in 2008, receiving support from the Chinese Academy of Sciences and the Guangdong provincial government in 2013, with international collaboration beginning in 2014 [5][6]. - The construction of the underground laboratory was completed in December 2021, with detector installation starting thereafter, and the experiment is set to officially begin data collection in August 2025 [5].