Core Insights - The Jiangmen Neutrino Experiment (JUNO) has officially begun data collection as of August 26, 2023, aiming to address significant questions in particle physics, particularly the mass ordering of neutrinos [1][2] - This facility, constructed over more than a decade, is designed to provide high-precision measurements of neutrino oscillation parameters and explore various astrophysical phenomena [1][2] Group 1 - The experiment is located 700 meters underground in Jiangmen, Guangdong, featuring a large organic glass sphere with a diameter exceeding 35 meters, which captures neutrinos [1] - Neutrinos are fundamental particles that constitute the material world and are the most abundant particles in the universe, yet many mysteries surrounding them remain unsolved [1][2] - The core detector of the experiment contains 20,000 tons of liquid scintillator, with thousands of photomultiplier tubes embedded in its outer wall to detect weak light signals generated by neutrino interactions [1][2] Group 2 - The project team successfully filled over 60,000 tons of ultra-pure water within 45 days, ensuring the liquid level difference between the inner and outer spheres is controlled to a centimeter level, with a flow deviation of no more than 0.5% [2] - The experiment is a collaboration involving approximately 700 researchers from 17 countries and regions, marking the first operation of such a large-scale and high-precision neutrino-specific scientific facility internationally [2] - The design lifespan of the Jiangmen Neutrino Experiment is planned for 30 years, with potential upgrades to conduct double beta decay experiments to investigate the absolute mass of neutrinos and whether they are Majorana particles [2]

Core Insights - The Jiangmen Neutrino Experiment, located 700 meters underground in Jiangmen, Guangdong, has officially begun data collection, marking it as the first next-generation large-scale neutrino experiment in the world [1][2] - The experiment aims to address significant issues in particle physics, particularly the neutrino mass ordering problem, with expectations of achieving breakthroughs that will enhance the precision of three out of six neutrino oscillation parameters [1] Group 1 - The central detector of the Jiangmen Neutrino Experiment is buried 700 meters underground to effectively reduce cosmic ray interference [1] - The detector contains 20,000 tons of liquid scintillator, capable of detecting neutrinos produced by the Taishan and Yangjiang nuclear power plants located 53 kilometers away [1] - Neutrinos are the oldest and most abundant particles in the universe, characterized by their light mass and near-light speed, making them interact very weakly with other matter [1] Group 2 - The experiment is designed to have a lifespan of 30 years and can later be upgraded to become the world's most sensitive experiment for neutrinoless double beta decay [2] - The completion of the detector filling and the commencement of data collection is considered a historic milestone, enabling researchers to address fundamental questions about the nature of matter and the universe [2] - The Jiangmen Neutrino Experiment is led by the Institute of High Energy Physics of the Chinese Academy of Sciences, with participation from 74 global research institutions [2]

Core Insights - The Jiangmen Underground Neutrino Observatory (JUNO) has successfully completed the infusion of 20,000 tons of liquid scintillator and has officially begun data collection, marking a historic milestone in neutrino research [1][2] - JUNO is the first large-scale, high-precision neutrino detector in the world, aimed at addressing fundamental questions about the nature of matter and the universe [1][2] - The detector is located 700 meters underground in Jiangmen, Guangdong Province, and can detect neutrinos from nuclear power plants located 53 kilometers away, measuring their energy spectrum with unprecedented precision [1][2] Technical Details - JUNO's design allows for the measurement of neutrino mass ordering without being affected by terrestrial matter effects and other unknown neutrino oscillation parameters, significantly improving the precision of three out of six neutrino oscillation parameters [2] - The core of the JUNO detector consists of a 20,000-ton liquid scintillator housed in an organic glass sphere, surrounded by thousands of photomultiplier tubes that detect faint light signals produced when neutrinos interact [2] - The construction of JUNO involved extensive planning, testing, and collaboration among hundreds of engineers and technicians, ensuring strict requirements for material purity, stability, and safety [2] Collaborative Efforts - JUNO is a major international collaboration led by the Institute of High Energy Physics of the Chinese Academy of Sciences, involving approximately 700 researchers from 74 institutions across 17 countries and regions [3] - The success of JUNO is attributed to effective international cooperation, which brought expertise in liquid scintillator detection technology to the project, pushing the boundaries of this technology [3] - The design lifespan of JUNO is planned for 30 years, with potential upgrades to become the world's most sensitive experiment for neutrinoless double beta decay, aiming to measure the absolute mass of neutrinos and investigate whether neutrinos are Majorana particles [3]

Core Insights - The Jiangmen Underground Neutrino Observatory (JUNO) has successfully completed the infusion of 20,000 tons of liquid scintillator and has officially begun data collection, marking it as the first operational large-scale and high-precision neutrino-specific scientific facility in the world [1][9] - The initial data collected during the trial operation indicates that the key performance indicators of the JUNO detector have met or exceeded design expectations, enabling it to address a significant issue in particle physics: the ordering of neutrino masses [1][9] Group 1 - The JUNO detector is located 700 meters underground near Jiangmen, Guangdong Province, and can detect neutrinos produced by the Taishan and Yangjiang nuclear power plants, measuring their energy spectrum with unprecedented precision [2] - Unlike similar international experiments, JUNO's measurement of mass ordering is unaffected by terrestrial material effects and other unknown neutrino oscillation parameters, significantly improving the precision of three out of six neutrino oscillation parameters [2] Group 2 - The JUNO project was proposed by the Institute of High Energy Physics, Chinese Academy of Sciences in 2008, received strategic support in 2013, and began construction of the underground laboratory in 2015 [5] - The laboratory construction was completed in December 2021, and the detector installation began, with the infusion of ultra-pure water and liquid scintillator starting in December 2024 [5] - The project team successfully infused over 60,000 tons of ultra-pure water within 45 days, maintaining a liquid level difference within centimeters and a flow deviation of no more than 0.5%, ensuring the safety and stability of the detector structure [5] Group 3 - The core detector of JUNO has an effective mass of 20,000 tons and is located in a 44-meter deep water pool, featuring a stainless steel mesh shell that supports various critical components, including a 35.4-meter diameter acrylic sphere and numerous photomultiplier tubes [7] - The JUNO project is a major international collaboration led by the Institute of High Energy Physics, involving nearly 700 researchers from 74 institutions across 17 countries and regions [9] - The design lifespan of JUNO is 30 years, with potential upgrades to become the world's most sensitive experiment for neutrinoless double beta decay, which could provide insights into fundamental questions about the nature of matter and the universe [9]

Core Viewpoint - The Jiangmen Neutrino Experiment (JUNO) has successfully completed the filling of 20,000 tons of liquid scintillator and has officially begun data collection, marking a significant milestone in neutrino research and particle physics [3][4]. Group 1: Experiment Overview - JUNO is the first large-scale neutrino experiment of its kind in the world, designed to address fundamental questions about the nature of matter and the universe [3]. - The experiment is located 700 meters underground in Jiangmen, Guangdong Province, and can detect neutrinos from nuclear power plants located 53 kilometers away [4]. - The design lifespan of the JUNO project is 30 years, with potential upgrades to enhance its sensitivity for future experiments [4]. Group 2: Technical Achievements - The initial data collected during the trial operation indicates that the detector's key performance metrics have met or exceeded design expectations [4]. - The experiment aims to resolve significant issues in particle physics, such as the mass ordering of neutrinos, specifically whether the third type of neutrino is heavier than the second [4]. Group 3: International Collaboration - The JUNO project involves collaboration among 700 researchers from 74 institutions across 17 countries and regions, highlighting its international significance [5]. - The success of the experiment is attributed to effective international cooperation, particularly in advancing liquid scintillator detection technology [5]. Group 4: Construction and Technical Requirements - The construction of JUNO required meticulous planning, testing, and adherence to strict material purity and safety standards [6]. - The core detector consists of a 20,000-ton liquid scintillator housed in a 41.1-meter diameter stainless steel structure, equipped with thousands of photomultiplier tubes to detect neutrino interactions [7][8].

Core Insights - The Jiangmen Underground Neutrino Observatory (JUNO) has officially begun data collection after completing the infusion of 20,000 tons of liquid scintillator, marking a significant milestone in neutrino research [1][3] - The initial data from JUNO indicates that its key performance metrics have met or exceeded design expectations, enabling the investigation of a major question in particle physics: the mass ordering of neutrinos [1][2] Group 1: Project Overview - JUNO is the first large-scale, high-precision neutrino detector in the world, designed to address fundamental questions about the nature of matter and the universe [1] - The project was proposed by the Institute of High Energy Physics of the Chinese Academy of Sciences in 2008, with construction starting in 2015 and completion of the detector's installation in December 2021 [3] Group 2: Technical Specifications - The core detector of JUNO has an effective mass of 20,000 tons and is located 700 meters underground, allowing it to detect neutrinos from nearby nuclear power plants with unprecedented precision [2][4] - The detector's design includes a 41.1-meter diameter stainless steel shell supporting a 35.4-meter diameter acrylic sphere filled with liquid scintillator, along with numerous photomultiplier tubes for detecting neutrino interactions [4] Group 3: Future Prospects - JUNO has a designed operational lifespan of 30 years and can be upgraded to become the world's most sensitive experiment for neutrinoless double beta decay, potentially providing insights into the absolute mass of neutrinos and their nature [4] - The successful operation of JUNO is expected to open new avenues for research in particle physics, astrophysics, and cosmology, significantly enhancing the understanding of the universe [4]

Core Insights - The Jiangmen Neutrino Experiment (JUNO) has officially commenced operations, marking the first large-scale neutrino experiment of its kind globally, aimed at addressing fundamental questions about the nature of matter and the universe [1][4]. Group 1: Experiment Overview - The JUNO detector is located 700 meters underground in Jiangmen, Guangdong Province, and is capable of detecting neutrinos from nuclear power plants located 53 kilometers away, with unprecedented precision in measuring their energy spectrum [2][4]. - The experiment has achieved key performance indicators that meet or exceed design expectations, enabling it to tackle significant questions in particle physics, such as the mass ordering of neutrinos [4][6]. Group 2: Technical Specifications - The core detector of JUNO has an effective mass of 20,000 tons of liquid scintillator, housed in a stainless steel structure with a diameter of 41.1 meters, and is equipped with numerous photomultiplier tubes to detect scintillation light produced by neutrino interactions [10][11]. - The project has stringent requirements for the purity, transparency, and low radioactivity of the liquid scintillator, all of which have been successfully met [10]. Group 3: International Collaboration - The JUNO project is a major international collaboration involving 700 researchers from 74 institutions across 17 countries and regions, highlighting the importance of global cooperation in advancing scientific research [6][8]. - The success of the JUNO experiment is attributed to effective international collaboration, particularly in pushing the limits of liquid scintillator detection technology [6]. Group 4: Future Prospects - The design lifespan of the JUNO experiment is projected to be 30 years, with potential upgrades to become the world's most sensitive experiment for neutrinoless double beta decay, which could provide insights into the absolute mass of neutrinos and whether they are Majorana particles [4][5]. - The experiment will significantly enhance the precision of three out of six neutrino oscillation parameters and open new avenues for exploring unknown physics, including searches for sterile neutrinos and proton decay [7].