Great news is spreading again! The Jiangmen Neutrino Experiment (JUNO) device, which was built and operated for only two months, achieved its first physical result - measuring the oscillation parameters of solar neutrinos, which improved the accuracy by 1.5 to 1.8 times compared to the best previous experiment. This achievement comes from the analysis of the first batch of valid data obtained by the JUNO device, indicating that the key performance indicators of the JUNO detector have fully met or exceeded the design expectations, and the device is ready to carry out cutting-edge research in neutrino physics. At present, the relevant paper has been submitted to "Chinese Physics C" and published on the preprint website arXiv on November 18th. What is neutrino? "It can be understood as a kind of 'ghost particle', which can easily penetrate the earth and the human body without leaving any trace." Wang Yifang, academician of the CAS Member and manager of the Jiangmen Neutrino Experiment Project, introduced that "this' stealth 'characteristic, which hardly interacts with matter, makes neutrinos become perfect cosmic messengers, carrying ancient information about the birth and evolution of the universe." Measuring neutrino oscillation is the most sensitive method to detect the mass of neutrinos at present. Our study of neutrinos is essentially a pure exploration of natural laws. In the long run, its value is immeasurable. ”Cao Jun, director of the Institute of High Energy Physics of the Chinese Academy of Sciences and deputy spokesman of JUNO, said that this is the meaning of basic research, that is, "we first understand the world, and the seeds of changing the world are often buried in this understanding". Neutrinos can be divided into three types: electron neutrinos, muon neutrinos, and tau neutrinos. The core goal of JUNO is to determine the mass order of these three neutrinos, that is, to figure out which one is the heaviest and which one is the lightest among them. ”Cao Jun introduced that this is one of the most fundamental scientific problems in the current field of neutrino physics. With its ultra-high detection sensitivity, JUNO will not only focus on the core target of neutrino mass order, but also accurately measure neutrino oscillation parameters, conduct various neutrino studies, and search for new physics beyond the standard model of particle physics. ”Wang Yifang revealed that JUNO's design has a lifespan of 30 years and can be upgraded to the world's most sensitive neutrinoless double beta decay experiment to test whether neutrinos are their own antiparticles and detect their absolute mass. In this round of experiments, researchers conducted a deep analysis of the reactor neutrino data from August 26th to November 2nd, a total of 59 days, and measured two oscillation parameters based on this data. It is understood that these two oscillation parameters can be determined by both solar neutrinos and nuclear reactor neutrinos. Previously, the scientific community measured data using these two methods with a standard deviation of approximately 1.5 times, which is known as the 'solar neutrino bias'. The Jiangmen neutrino experiment confirmed that this deviation still exists by measuring neutrinos in nuclear reactors, but the measurement accuracy has increased by 1.5 to 1.8 times compared to previous international related experiments. From the proposal in 2008 to its implementation in Jiangmen, Guangdong, from the start of tunnel and underground laboratory construction in 2015 to the official operation and data collection on August 26 this year, the design and construction of JUNO device has gone through more than 10 years. As the world's first large-scale and high-precision neutrino dedicated scientific facility, the Jiangmen Neutrino Experiment will assist scientists in conducting cutting-edge research on neutrinos from the sun, supernovae, atmosphere, and Earth. The Jiangmen Neutrino Experiment was able to complete such high-precision measurements in just two months, indicating that the performance of the JUNO detector fully meets the design expectations. ”Wang Yifang said. JUNO deputy spokesperson and Italian scientist Gioachino Ranucci stated that this state-of-the-art detector, jointly built by scientists from around the world, will dominate the field of neutrino physics in the coming years and provide highly accurate results. Ding Chibiao, Vice President of the Chinese Academy of Sciences, said that the Jiangmen neutrino experiment is a large-scale international cooperation project in basic scientific research that gathers global wisdom. It fully demonstrates China's concept of openness, cooperation and win-win in international cooperation, and is also the specific practice of the Chinese Academy of Sciences in leading innovative development and demonstrating responsibility in the field of science and technology. (New Society)