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
Aug 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
Fusion Science and Technology
August 2025
Latest News
Powering the future: How the DOE is fueling nuclear fuel cycle research and development
As global interest in nuclear energy surges, the United States must remain at the forefront of research and development to ensure national energy security, advance nuclear technologies, and promote international cooperation on safety and nonproliferation. A crucial step in achieving this is analyzing how funding and resources are allocated to better understand how to direct future research and development. The Department of Energy has spearheaded this effort by funding hundreds of research projects across the country through the Nuclear Energy University Program (NEUP). This initiative has empowered dozens of universities to collaborate toward a nuclear-friendly future.
A. A. Vankov and V. F. Ukraintsev, N. Yaneva, S. Toshkov, A. Mateeva
Nuclear Science and Engineering | Volume 96 | Number 2 | June 1987 | Pages 122-136
Technical Paper | doi.org/10.13182/NSE87-A16372
Articles are hosted by Taylor and Francis Online.
Transmission and fission self-indication were measured for the isotopes 235U, 238U, and 239Pu in the unresolved resonance region for a wide range of material thicknesses. The fission cross section of 235U serves as standard. The other isotopes are the basic fuel components in plutonium fast breeder reactors., The experimental results obtained were analyzed together with average cross-section data using the multilevel R-matrix formalism. The objective of the consistent analysis was to estimate sets of mean resonance parameters. For this purpose, a new multilevel ladder technique was developed (Monte Carlo method) that enabled calculation of all the functionals of interest including their sensitivity coefficients related to the mean resonance parameters. Hence, the perturbation approach and the correlated random sampling technique were employed., The method of evaluation was strictly statistical, allowing a priori information on the parameters to be used. Thus, a new consistent evaluation of the mean resonance parameters under consideration and of the whole table of group constants requested was performed., The results are discussed with respect to their reliability in practical applications.
