从地面入口乘上缆车，沿斜井隧道缓缓下行，伴随鼓风机的持续轰鸣，约15分钟后，记者抵达一个 宽敞明亮的地下空间。这里位于地下700米深处，正是江门中微子实验（JUNO）所在地。 在宇宙大爆炸后的极早期，空间中曾遍布着微小的"密度涨落"，它们是未来所有星系、恒星乃至生 命的原始"种子"。但如果中微子完全没有质量，它就会以光速飞驰，从而将这些珍贵的初始"种子"全部 抹平。 11月19日，中国科学院高能物理研究所在此举办新闻发布会，宣布JUNO装置建设成功并发布首个 物理成果。利用JUNO投入运行后59天获取的数据，JUNO合作组成功测量了两个关键的太阳中微子振 荡参数，并将测量精度提升至此前最好结果的1.5到1.8倍。 作为国际上首个建成的新一代超大规模、超高精度中微子实验装置，JUNO主要解决哪些科学问 题？研究中微子对普通人有什么意义？为什么要不遗余力地提高中微子振荡参数的测量精度？针对以上 问题，科技日报记者采访了相关专家。 第一问：中微子有隐身特性，研究它能揭示哪些奥秘？ 中微子是一种"幽灵粒子"，能轻易穿透地球和人体，却几乎不留痕迹。"这种几乎不与物质作用 的'隐身'特性，使中微子成为完美的宇宙信使，携带 ...

第一问：中微子有隐身特性，研究它能揭示哪些奥秘？ 11月19日，中国科学院高能物理研究所在此举办新闻发布会，宣布JUNO装置建设成功并发布首个 物理成果。利用JUNO投入运行后59天获取的数据，JUNO合作组成功测量了两个关键的"太阳中微子振 荡参数"，并将测量精度提升至此前最好结果的1.5到1.8倍。 作为国际上首个建成的新一代超大规模、超高精度的中微子实验装置，JUNO主要解决哪些科学问 题？研究中微子对普通人有什么意义？为什么要不遗余力地提高中微子振荡参数的测量精度？针对以上 问题，科技日报记者采访了相关专家。 从地面入口乘上缆车，沿斜井隧道缓缓下行，伴随鼓风机的持续轰鸣，约15分钟后，记者抵达一个 宽敞明亮的地下空间。这里位于地下700米深处，正是江门中微子实验（JUNO）所在地。 中微子是一种"幽灵粒子"，能轻易穿透地球和人体，却几乎不留痕迹。"中微子的这种几乎不与物 质作用的'隐身'特性，使它成为完美的宇宙信使，携带着关于宇宙诞生与演化的古老信息。"JUNO合作 组发言人、中国科学院高能物理研究所王贻芳院士说，JUNO就是一个研究中微子的专用大科学装置。 "中微子可以分为三种：电子中微子、缪中微子 ...

中微子被称为"幽灵粒子"，是宇宙中最轻且最难以捕捉的粒子之一。江门中微子实验是为探测这些"幽 灵粒子"而建设的大科学装置，于2025年8月26日正式运行取数。 南都讯 11月19日，中国科学院高能物理研究所在广东省江门市举办发布会，宣布江门中微子实验 （JUNO）装置建设成功并发布了首个物理成果——测量太阳中微子振荡参数，结果比此前实验的最好 精度提升了1.5-1.8倍。 JUNO探测到的一个反应堆中微子事例。 经过JUNO国际合作组十余年的设计和建设，JUNO成为国际上首个建成的新一代超大规模、超高精度 的中微子实验装置。JUNO在运行期间首批获取的数据显示，其探测器关键性能指标全面达到或超越设 计预期，表明JUNO已准备好开展中微子物理前沿研究。该探测器性能分析文章已提交《中国物理 C》，并于11月18日在预印本网站arXiv上发布。 在发布会上，中国科学院副院长、党组成员丁赤飚表示，江门中微子实验是一项汇聚了全球智慧的大型 基础科学研究国际合作项目，该项目充分展现了我国在国际合作方面开放、合作、共赢的理念，也是中 国科学院在科技领域引领创新发展、体现大国担当的具体实践。希望项目团队再接再厉，确保江门中微 ...

从地面入口乘上缆车，沿斜井隧道缓缓下行，伴随鼓风机的持续轰鸣，约15分钟后，记者抵达一个宽敞 明亮的地下空间。这里位于地下700米深处，正是江门中微子实验（JUNO）所在地。 11月19日，中国科学院高能物理研究所在此举办新闻发布会，宣布JUNO装置建设成功并发布首个物理 成果。利用JUNO投入运行后59天获取的数据，JUNO合作组成功测量了两个关键的"太阳中微子振荡参 数"，并将测量精度提升至此前最好结果的1.5到1.8倍。 作为国际上首个建成的新一代超大规模、超高精度的中微子实验装置，JUNO主要解决哪些科学问题？ 研究中微子对普通人有什么意义？为什么要不遗余力地提高中微子振荡参数的测量精度？针对以上问 题，科技日报记者采访了相关专家。 来源：科技日报 科技日报记者 陆成宽 何沛苁 "中微子与我们的最直接联系，可以追溯到万物的开端。它决定了我们能否存在。"王贻芳说。 在宇宙大爆炸后的极早期，空间中曾遍布着微小的"密度涨落"，它们是未来所有星系、恒星乃至生命的 原始"种子"。但如果中微子完全没有质量，它就会以光速飞驰，从而将这些珍贵的初始"种子"全部抹 平。 王贻芳解释，正是因为有一点点微小的质量，中微子才 ...

探测器性能符合预期，测量精度前所未有 中国科学院高能物理研究所副所长、江门中微子实验合作组物理分析负责人温良剑报告了首个物理成 果。通过对今年8月26日至11月2日共59天有效数据的分析，江门中微子实验合作组测量了被称为"太阳 中微子振荡参数"的混合角theta(12)及其相关的质量参数，比此前实验的最好精度提高了1.5到1.8倍。 11月19日，中国科学院高能物理研究所在广东省江门市举办发布会，宣布江门中微子实验(JUNO)装置 建设成功并发布了首个物理成果。 捕捉"幽灵粒子"，将确定其质量顺序 中微子是构成物质世界的12种基本粒子中的三种，包括电子中微子、缪中微子和陶中微子。宇宙中充斥 着大量的中微子，恒星内部的核反应、超新星的爆发、核反应堆的运行，以至于岩石中的放射性物质衰 变，都产生大量中微子。 中微子与普通物质的相互作用很弱，它们可以轻松穿过人体、建筑甚至整个地球而不被任何物质吸收， 不容易被检测到。因此，中微子被称为"幽灵粒子"。江门中微子实验探测器位于广东省江门市附近的地 下700米处，可以探测53公里外台山和阳江核电站产生的中微子，并以前所未有的精度测量它们的能 谱。 经过十余年的设计和建设， ...

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 (JUNO) has officially commenced 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, represents a major advancement in neutrino research, building on previous experiments like the Daya Bay Neutrino Experiment [1][2] Group 1: Project Overview - The JUNO facility is located 700 meters underground in Jiangmen, Guangdong, featuring a large acrylic sphere with a diameter exceeding 35 meters designed to detect neutrinos [1] - The experiment will not only focus on neutrino mass ordering but also measure neutrino oscillation parameters with higher precision and explore various astrophysical phenomena [1][2] Group 2: Technical Achievements - The project team successfully filled over 60,000 tons of ultra-pure water within 45 days, maintaining a liquid level difference within centimeters and a flow deviation of less than 0.5%, ensuring the stability and safety of the detector [2] - This experiment is the first of its kind to operate a large-scale, high-precision neutrino detection facility internationally, providing insights into fundamental questions about matter and the universe [2] Group 3: Future Prospects - The JUNO facility is designed for a lifespan of 30 years, with potential upgrades to conduct double beta decay experiments to investigate the absolute mass of neutrinos and test if they are Majorana particles [2] - The collaboration involves approximately 700 researchers from 17 countries and regions, marking a significant international effort in advancing neutrino physics [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 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]