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
2025 ANS Winter Conference & Expo
November 8–12, 2025
Washington, DC|Washington Hilton
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
Oct 2025
Jul 2025
Latest Journal Issues
Nuclear Science and Engineering
December 2025
Nuclear Technology
November 2025
Fusion Science and Technology
Latest News
Illinois legislature lifts ban on nuclear energy, funds clean energy
The Illinois General Assembly passed a clean energy bill on October 30 that would, in part, lift a 30-year moratorium on new nuclear energy in the state and create incentives for more energy storage.
William S. Hogan
Nuclear Science and Engineering | Volume 8 | Number 6 | December 1960 | Pages 518-522
Technical Paper | doi.org/10.13182/NSE60-A25838
Articles are hosted by Taylor and Francis Online.
Negative-reactivity measurements are frequently made by the rod-drop and source-jerk techniques. Analysis of the data from such experiments by the usual methods requires measurement of the flux-time curve during a transient. Two alternative methods of obtaining negative reactivities are presented here. Neither of these methods requires measurement of a flux transient. Experimental results using these methods are given.
