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.
Explore membership for yourself or for your organization.
Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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
Jul 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
August 2025
Nuclear Technology
Fusion Science and Technology
Latest News
ANS joins others in seeking to discuss SNF/HLW impasse
The American Nuclear Society joined seven other organizations to send a letter to Energy Secretary Christopher Wright on July 8, asking to meet with him to discuss “the restoration of a highly functioning program to meet DOE’s legal responsibility to manage and dispose of the nation’s commercial and legacy defense spent nuclear fuel (SNF) and high-level radioactive waste (HLW).”
A. Ziya Akcasu, R. K. Osborn
Nuclear Science and Engineering | Volume 26 | Number 1 | September 1966 | Pages 13-25
Technical Paper | doi.org/10.13182/NSE66-A17183
Articles are hosted by Taylor and Francis Online.
The space- and energy-dependent theory of reactor-noise analysis has been developed using Langevin's technique starting from the transport equations. The theory includes delayed neutrons. The correlation function and the power spectral density for the detection rate, as well as for the neutron density, have been obtained. The application of the general theory to simple reactor models has been discussed and illustrated by considering the one-speed transport and one-speed diffusion approximations. The connection between Langevin's technique and the doublet theory based on the Liouville equation has been established. It has been found that both formulations yield identical results and that the postulates of Langevin's technique are justified for the study of neutron distributions.