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BESIII Experiment Achieves High-Precision Measurement of Charm Meson Semileptonic Decays and First Constraint on "Scalar Current"

Recently, the BESIII international collaboration utilized the world's largest near-threshold charm meson data sample to perform a combined measurement of four semileptonic decay channels: D⁰→K⁻e⁺νₑ, D⁰→K⁻μ⁺νμ, D⁺→K̄⁰e⁺νₑ, and D⁺→K̄⁰μ⁺νμ. The research team extracted the quark mixing matrix element |Vcs| with a precision better than 0.5%, determined the form factor zero-point value f₊(0) with a precision better than 0.2%, and verified lepton universality in the above processes at the 0.5% precision level. Beyond these precise determinations of Standard Model parameters, what is particularly noteworthy is that this experiment has, for the first time...

2026-09-08

Zhangzhou Nuclear Power Units 3 and 4 Trench Civil Engineering Completes Milestone Phase

On August 27, with the final cubic meter of concrete poured into place, the B1 and B6 sections of the GS and GB trench civil engineering works for Zhangzhou Nuclear Power Units 3 and 4, undertaken by CNNC Huachen, along with the No. 4 overflow well, successfully completed their milestone phase. This phase involved multi-disciplinary cross-operations spanning civil works, installation, electrical, and piping, characterized by complex construction conditions and significant coordination challenges. Among these, Section B1, as the project's main critical path, featured narrow working areas, difficult access for large equipment, and intensive vertical and horizontal cross-operations among multiple units. Seven days before commencement, the project department established a dedicated planning team to verify site conditions, material routes, and cross-operation scopes drawing by drawing, identifying key difficulties such as foundation pouring, equipment positioning, and material supply, and conducting multiple rounds of discussions to optimize the construction plan. The construction period coincided with the rainy season, and Section B1, situated in a low-lying area, faced a high risk of rainwater backflow. The project department implemented measures including full-coverage rain shelters over the base slab, water-retaining curbs at passage openings, and round-the-clock pumping in two shifts, securing dry working areas amid accumulated water; simultaneously, discarded waterproof membranes were collected and reused to cover rebar cages and scaffolding, preventing corrosion and slippery conditions. On-site daily meetings were held, management personnel maintained 24-hour duty, and verbal confirmation with signed handovers was practiced, ensuring issues were resolved the same day, with no plan failures, rain-related stoppages, or process disconnections throughout the period. Facing the immense scheduling pressure from multi-process cross-operations, the project department established a dynamic scheduling system. In terms of manpower loading, fixed posts and personnel quotas were implemented, with zonal responsibility and flexible reinforcement; during peak periods, core work crews were consolidated and work areas were precisely delineated. For machinery, a dynamic scheduling ledger was established, with tower cranes, excavators, and lifting equipment staggered and cross-utilized. Material coordination was also optimized through advance stocking, zoned storage, dedicated management, and emergency replenishment. During the campaign, when the transport of main materials was obstructed, the project department organized management staff and labor crews to manually carry rebar, pipes, and auxiliary materials point-to-point to the working areas, effectively safeguarding project progress. Currently, the main structure construction of the GS and GB trenches by the Zhangzhou Nuclear Power Project Department has achieved phased results, with the GB trench completing 74 sections cumulatively, an 82% completion rate, and the GS trench exceeding 1,160 meters, accounting for 72% of the total length. The company will further strengthen construction organization, optimize construction logic, and continue to advance the remaining sections of the Zhangzhou Nuclear Power Project Department, fully ensuring high-quality performance of the contracted projects.

2026-08-29

Large Transformer Arrives for Restart Project at US Three Mile Island Unit 1

August 21 news, Constellation Energy, the company overseeing the refurbishment of the Three Mile Island nuclear plant, said this week that a transformer weighing approximately 262 tons, shipped from South Korea to Pennsylvania, USA, has arrived at the plant site in Middletown. This is the first of three large transformers planned for delivery to the site. Constellation Energy is advancing the restart of Unit 1 at Three Mile Island and plans to rename the project the Crane Clean Energy Center. The unit has been shut down since 2019. Constellation Energy stated that the arrival of the transformer is a key milestone in its effort to restore 835 megawatts of reliable...

2026-08-23

SuperMag New Energy Achieves Milestone Progress in Development of 25 T-Class High-Temperature Superconducting Toroidal Field Model Magnet

Recently, SuperMag New Energy has achieved two milestone progresses in the development of its 25 T-class high-temperature superconducting toroidal field model magnet: following the completion of R&D and testing of the first panel-type high-temperature superconducting single pancake coil, the company has initiated batch manufacturing of panel-type single pancake coils; meanwhile, the self-developed 24 cm² low-resistance detachable joint has completed prototype fabrication and performance testing in the liquid nitrogen temperature range, with an equivalent joint resistance of approximately 33 nΩ. These two progresses correspond to two critical aspects: stable manufacturing of single pancake coils and low-loss interconnection of multiple units. The project has advanced from the single-component process validation stage toward multi-pancake manufacturing and model magnet system integration. The single pancake coil is not an ordinary component in the model magnet, but rather a fundamental unit integrating conductor, panel structure, insulation, electrical connection, and testing interfaces. Each single pancake requires independent manufacturing and inspection, and also serves as the foundation for subsequent multi-pancake stacking, magnet excitation, and cryogenic operation.

2026-08-21

Russia's SKIF Synchrotron Radiation Facility Hailed as a Milestone for Russian Science

On August 13, Russian President Vladimir Putin visited the Koltsovo Science City in Novosibirsk to learn about the operating principles of the Siberian Circular Photon Source (SKIF), a shared-use center. This center is the first facility in a network of modern synchrotron radiation sources being built in Russia, with construction efforts incorporated into the national development program for synchrotron and neutron research and related research infrastructure, covering the period through 2030 and beyond. It was reported that SKIF, with its high-brightness, high-intensity X-ray beams, can serve high-level research in fields such as chemistry, physics, materials science, biology, geology, archaeology, and paleontology. Officials also noted that...

2026-08-14

Deep Fission Details 'One-Mile-Deep PWR' Roadmap at Canaccord Conference, Targeting First Commercial Operation by End of 2027

On August 11, Deep Fission (FISN) unveiled a differentiated nuclear commercialization pathway at Canaccord Genuity's 46th Annual Growth Conference: rather than reinventing nuclear fission technology, the company aims to deploy mature pressurized water reactors in underground boreholes approximately one mile deep. CEO Liz Muller emphasized that the core approach is to change where reactors are deployed, not to adopt an entirely new reactor physics model. Given that PWR technology has been used in commercial nuclear power for decades, the company hopes to shorten the validation cycle by leveraging mature technology and avoid the new fuel, new material, and new design licensing hurdles faced by some advanced nuclear projects. According to the company's plan...

2026-08-12

Zhang Yiming, Chairman of HTA: Tackling the "Last Mile" of Nuclear Pharmacy Network Delivery to Bring Domestic Radiopharmaceuticals to Patients in Western and County-Level Regions

On July 28, the 2026 Radiopharmaceutical Innovation and Development Conference was held in Taiyuan, Shanxi Province. Zhang Yiming, Party Committee Secretary and Chairman of HTA, told reporters that the company is restructuring its short half-life radiopharmaceutical delivery system through "regional layout + standardized logistics + grassroots empowerment," striving to ensure that cancer patients in western and county-level regions can access domestically produced radiopharmaceuticals within the drug's effective half-life window. Currently, multi-dimensional policy dividends are being continuously released, and China's radiopharmaceutical industry is entering a critical window of opportunity. Alpha nuclide drugs represent the future direction of therapeutic radiopharmaceuticals. Zhang Yiming introduced that HTA has already made early arrangements for drug research in this field, jointly conducting research on actinium-225 labeled...

2026-08-05

India's cumulative nuclear power generation surpasses 1 trillion units (1000 BU), NPCIL sets historic milestone

Nuclear Power Corporation of India Limited (NPCIL) announced on August 4 that cumulative nuclear power generation since the start of commercial operations has exceeded 100 billion kilowatt-hours (1000 Billion Units, equivalent to 1 trillion kWh) for the first time. The company stated that this milestone marks a significant achievement on India's path toward clean and sustainable energy, corresponding to avoiding approximately 860 million tonnes of CO₂ emissions—equivalent to approximately taking 187 million gasoline and diesel passenger vehicles off the road for a full year, or nearly the total annual greenhouse gas emissions of a single industrialized nation such as Germany or Japan. NPCIL data shows that electricity generated through nuclear power has effectively avoided substantial greenhouse gas emissions. Nuclear energy is recognized as one of the low-carbon and reliable energy sources, playing a critical role in addressing climate change...

2026-08-05

Argentine President Javier Milei Appoints Former Bariloche Mayor Gennuso as Vice President of the Atomic Energy Commission

Argentine President Javier Milei has appointed Gustavo Gennuso as the new Vice President of the Argentine National Atomic Energy Commission (CNEA) through Decree No. 673/2026. Gennuso previously served as Mayor of San Carlos de Bariloche (2015–2023), and this appointment brings the former mayor into a key institution in Argentina's nuclear sector, also reflecting the political expansion of the ruling party "La Libertad Avanza" in Río Negro Province ahead of the 2027 elections. Former Vice President Luis Alfredo Tomás Rovere has stepped down, as part of the restructuring published in the Official Gazette. Decree No. 655/2026 shows the CNEA undergoing major reorganization...

2026-08-03

U.S. Brookhaven National Laboratory Achieves Milestones in High-Luminosity Large Hadron Collider Upgrade

On July 29, the Large Hadron Collider (LHC) at CERN concluded its recent run and entered a four-year shutdown for maintenance. During this shutdown, some LHC components will be dismantled and rebuilt for the High-Luminosity LHC (HiLumi LHC) upgrade project. The U.S. Department of Energy's Brookhaven National Laboratory has recently achieved important production milestones in both accelerator and detector-related work. The LHC helps scientists study the fundamental structure of matter by accelerating and colliding two beams of protons traveling in opposite directions in a nearly 17-mile circular ring. The core goal of the HiLumi LHC upgrade is to significantly increase the number of particle collisions per unit time, i.e., enhance "luminosity," thereby increasing the chance of recording rare interactions.

2026-07-30

Public Meeting Held on Restart Plan for Three Mile Island Unit 1

As electricity demand from AI-related data centers rises, multiple locations across the United States are reassessing the value of nuclear reactors originally slated for decommissioning. Recently, the restart plan for Unit 1 of the Three Mile Island Nuclear Power Plant in eastern Pennsylvania has entered the public engagement phase. The Three Mile Island plant has long been under scrutiny due to the 1979 accident at Unit 2, which involved a nuclear fuel meltdown and the release of radioactive materials. The proposed restart involves the adjacent Unit 1, which has been in the decommissioning process since 2019. Upon restart, it will operate under the name "Crane Clean Energy Center." On July 28, the U.S. Nuclear Regulatory Commission...

2026-07-30