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
July 2025
Latest News
Hash Hashemian: Visionary leadership
As Dr. Hashem M. “Hash” Hashemian prepares to step into his term as President of the American Nuclear Society, he is clear that he wants to make the most of this unique moment.
A groundswell in public approval of nuclear is finding a home in growing governmental support that is backed by a tailwind of technological innovation. “Now is a good time to be in nuclear,” Hashemian said, as he explained the criticality of this moment and what he hoped to accomplish as president.
Noel Corngold, Paul Michael, Warren Wollman
Nuclear Science and Engineering | Volume 15 | Number 1 | January 1963 | Pages 13-19
Technical Paper | doi.org/10.13182/NSE63-A26259
Articles are hosted by Taylor and Francis Online.
We examine herein the decay constants,λk which appear in the modal expansion of the neutron density in a study of the time-dependent thermalization of neutrons. A study of the proton gas moderator indicates the existence of an infinite number of discrete λk in the range . The upper limit is a limit point for the eigenvalue sequence. Consideration of more general models indicates the existence of a discrete spectrum in the range 0 min and max and a continuous spectrum in .
