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
2026 Annual Conference
May 31–June 3, 2026
Denver, CO|Sheraton Denver
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
Nov 2025
Jul 2025
Latest Journal Issues
Nuclear Science and Engineering
December 2025
Nuclear Technology
Fusion Science and Technology
November 2025
Latest News
X-energy raises $700M in latest funding round
Advanced reactor developer X-energy has announced that it has closed an oversubscribed Series D financing round of approximately $700 million. The funding proceeds are expected to be used to help continue the expansion of its supply chain and the commercial pipeline for its Xe-100 advanced small modular reactor and TRISO-X fuel, according the company.
L. Tomlinson
Nuclear Technology | Volume 14 | Number 1 | April 1972 | Pages 42-52
Technical Paper | Session on Physics of Nuclear Materials Safeguards / Reactor | doi.org/10.13182/NT72-A31096
Articles are hosted by Taylor and Francis Online.
At least 38 of the fission product isotopes are now known to be delayed-neutron precursors. The region of delay ed-neutr on emission for each fission product element is predicted successfully by recent mass formulas, and the neutron emission probability (Pn) can be approximately related to basic nuclear parameters. Using Pn values and calculated cumulative fission yields, it is possible to account for some features of gross delayed-neutron emission from various types of fission. Further significant progress in understanding delayed-neutron emission is expected in the near future when spectroscopic studies are made on delayed-neutron precursors.