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
Nuclear Installations Safety
Devoted specifically to the safety of nuclear installations and the health and safety of the public, this division seeks a better understanding of the role of safety in the design, construction and operation of nuclear installation facilities. The division also promotes engineering and scientific technology advancement associated with the safety of such facilities.
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!
Latest Magazine Issues
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
June 2025
Nuclear Technology
Fusion Science and Technology
May 2025
Latest News
DOE-EM awards $74.8M Oak Ridge support services contract
The Department of Energy’s Office of Environmental Management has awarded a five-year contract worth up to $74.8 million to Independent Strategic Management Solutions for professional support services at the Oak Ridge Office of Environmental Management site in Oak Ridge, Tenn.
Weston M. Stacey, Jr.
Nuclear Science and Engineering | Volume 41 | Number 3 | September 1970 | Pages 381-393
Technical Paper | doi.org/10.13182/NSE70-A19096
Articles are hosted by Taylor and Francis Online.
Continuous slowing down theory is applied to the treatment of the elastic moderation of neutrons in a fast-reactor assembly, where strong scattering resonances are prevalent. Three prescriptions for the moderating parameters, one of which is original to this paper, are studied. Continuous slowing down theory is demonstrated to yield quite accurate results for the neutron spectrum, when the improved prescriptions presented in this paper are used. A method for treating narrow resonance absorption separate from the slowing down calculation, then using the results of the former to attenuate the flux obtained from the latter, is presented and demonstrated to be promising.