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
Nuclear Nonproliferation Policy
The mission of the Nuclear Nonproliferation Policy Division (NNPD) is to promote the peaceful use of nuclear technology while simultaneously preventing the diversion and misuse of nuclear material and technology through appropriate safeguards and security, and promotion of nuclear nonproliferation policies. To achieve this mission, the objectives of the NNPD are to: Promote policy that discourages the proliferation of nuclear technology and material to inappropriate entities. Provide information to ANS members, the technical community at large, opinion leaders, and decision makers to improve their understanding of nuclear nonproliferation issues. Become a recognized technical resource on nuclear nonproliferation, safeguards, and security issues. Serve as the integration and coordination body for nuclear nonproliferation activities for the ANS. Work cooperatively with other ANS divisions to achieve these objective nonproliferation policies.
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
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
May 2025
Nuclear Technology
April 2025
Fusion Science and Technology
Latest News
Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
Thomas E. Stephenson and Sol Pearlstein
Nuclear Science and Engineering | Volume 32 | Number 3 | June 1968 | Pages 377-384
Technical Paper | doi.org/10.13182/NSE68-A20220
Articles are hosted by Taylor and Francis Online.
Early work ascertained that the Mn total cross section could not be fit by the Breit-Wigner single-level formula. Later work showed that a satisfactory fit below 10 keV could be achieved by the use of R-matrix analysis. Here, recent resonance data and the Breit-Wigner multilevel formula are used to fit the experimental data from 0.01 eV to 50 keV. Two bound levels and several positive energy levels are introduced in order to produce very good agreement with the measured total cross section. The parametric representation of the 55Mn cross section yields calculated values of 13.4 and 15 b for the capture 2200 m/sec cross section and resonance integral, and 1.94, 1.71, and 556 b for the thermal-bound atom, coherent-scattering cross section, and scattering resonance integral, respectively, all values being in good agreement with experiment. Qualitative agreement is obtained with polarization data.
