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.
J. M. Neill, J. C. Young, C. A. Preskitt, G. D. Trimble, R. C. Lloyd, C. L. Brown
Nuclear Science and Engineering | Volume 46 | Number 2 | November 1971 | Pages 244-254
Technical Paper | doi.org/10.13182/NSE71-A22358
Articles are hosted by Taylor and Francis Online.
Neutron spectrum measurements covering the range thermal to 3 keV have been made by time-of-flight in three solutions of plutonium nitrate. The concentrations and 240 Pu composition of these solutions were 197.9 g/liter at 23 wt%, 193.4 g/liter at 5 wt%, and 355.0 g/liter at 5 wt%, respectively. Flux traverses and time-dependent measurements were also made in each solution. The measured spectra have been compared to theoretical calculations using the Haywood-II scattering kernel for H bound in H2O and the ENDF/B Version I cross sections for 239Pu. A good comparison is obtained for the two lowest concentrations. The disagreements for the highest concentration are ascribed to room return effects.
