ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Robotics & Remote Systems
The Mission of the Robotics and Remote Systems Division is to promote the development and application of immersive simulation, robotics, and remote systems for hazardous environments for the purpose of reducing hazardous exposure to individuals, reducing environmental hazards and reducing the cost of performing work.
Meeting Spotlight
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)
April 27–30, 2025
Denver, CO|The Westin Denver Downtown
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Nuclear Science and Engineering
May 2025
Nuclear Technology
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Latest News
TerraPower begins U.K. regulatory approval process
Seattle-based TerraPower signaled its interest this week in building its Natrium small modular reactor in the United Kingdom, the company announced.
TerraPower sent a letter to the U.K.’s Department for Energy Security and Net Zero, formally establishing its intention to enter the U.K. generic design assessment (GDA) process. This is TerraPower’s first step in deployment of its Natrium technology—a 345-MW sodium fast reactor coupled with a molten salt energy storage unit—on the international stage.
L. Tomlinson
Nuclear Technology | Volume 14 | Number 1 | April 1972 | Pages 42-52
Technical Paper | Session on Physics of Nuclear Materials Safeguards / Reactor | doi.org/10.13182/NT72-A31096
Articles are hosted by Taylor and Francis Online.
At least 38 of the fission product isotopes are now known to be delayed-neutron precursors. The region of delay ed-neutr on emission for each fission product element is predicted successfully by recent mass formulas, and the neutron emission probability (Pn) can be approximately related to basic nuclear parameters. Using Pn values and calculated cumulative fission yields, it is possible to account for some features of gross delayed-neutron emission from various types of fission. Further significant progress in understanding delayed-neutron emission is expected in the near future when spectroscopic studies are made on delayed-neutron precursors.
