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
Materials Science & Technology
The objectives of MSTD are: promote the advancement of materials science in Nuclear Science Technology; support the multidisciplines which constitute it; encourage research by providing a forum for the presentation, exchange, and documentation of relevant information; promote the interaction and communication among its members; and recognize and reward its members for significant contributions to the field of materials science in nuclear technology.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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
Feb 2025
Jul 2024
Latest Journal Issues
Nuclear Science and Engineering
March 2025
Nuclear Technology
Fusion Science and Technology
February 2025
Latest News
Candidates for leadership provide statements: ANS Board of Directors
With the annual ANS election right around the corner, American Nuclear Society members will be going to the polls to vote for a vice president/president-elect, treasurer, and members-at-large for the Board of Directors. In January, Nuclear News published statements from candidates for vice president/president-elect and treasurer. This month, we are featuring statements from each nominee for the Board of Directors.
Charles R. Marotta
Nuclear Technology | Volume 39 | Number 3 | August 1978 | Pages 323-326
Technical Note | Chemical Processing | doi.org/10.13182/NT78-A32062
Articles are hosted by Taylor and Francis Online.
A simple formulation is developed that permits a quick and accurate estimate of the maximum increase in reactivity that an unmoderated fissile system can experience if subjected to high compaction forces. The keff estimates from the proposed model are compared with Monte Carlo and transport theory values and indicate that for low-density fissile systems and realistic compressions, there is excellent agreement. Good agreement is achieved for denser systems up to ∼20% compression. Some practical areas of application and extension of the model are indicated in which large uniform external pressures may exist.