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
Mathematics & Computation
Division members promote the advancement of mathematical and computational methods for solving problems arising in all disciplines encompassed by the Society. They place particular emphasis on numerical techniques for efficient computer applications to aid in the dissemination, integration, and proper use of computer codes, including preparation of computational benchmark and development of standards for computing practices, and to encourage the development on new computer codes and broaden their use.
Meeting 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
Jun 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
August 2025
Nuclear Technology
July 2025
Fusion Science and Technology
Latest News
NRC cuts fees by 50 percent for advanced reactor applicants
The Nuclear Regulatory Commission has announced it has amended regulations for the licensing, inspection, special projects, and annual fees it will charge applicants and licensees for fiscal year 2025.
T. F. Ruane, M. L. Storm
Nuclear Science and Engineering | Volume 6 | Number 2 | August 1959 | Pages 119-127
Technical Paper | doi.org/10.13182/NSE59-A25641
Articles are hosted by Taylor and Francis Online.
Epithermal nonabsorption probabilities for neutron absorbers are important parameters in the evaluation of control rod worths. In this article, the average epithermal nonabsorption probability () for hafnium slabs is calculated by two different methods: (1) Within the framework of a specific two-dimensional, three-energy-group calculational scheme, an empirical value of is determined which gives agreement with experimental rod worths. (2) Based on available microscopic cross-section data for the hafnium isotopes, the value of is calculated and compared with the empirical value obtained above. The values of obtained by these different methods for 0.1 in. and 0.2 in. thick slabs agree to within 10 per cent, thus verifying the physical reasonableness of the empirical probabilities.
