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
Robotics & Remote Systems
The Mission of the Robotics and Remote Systems Division is to promote the development and application of immersive simulation, robotics, and remote systems for hazardous environments for the purpose of reducing hazardous exposure to individuals, reducing environmental hazards and reducing the cost of performing work.
Meeting Spotlight
2024 ANS Winter Conference and Expo
November 17–21, 2024
Orlando, FL|Renaissance Orlando at SeaWorld
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
Aug 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
October 2024
Nuclear Technology
Fusion Science and Technology
August 2024
Latest News
New laws offer nuclear industry incentives for existing power plant uprates
This year, the U.S. nuclear industry received a much-needed economic boost that could help preserve operating nuclear power plants and incentivize upgrades that extend their lifespan and power output.
Signed into law in 2022, the Inflation Reduction Act offers production tax credits (PTCs) for existing nuclear power plants and either PTCs or investment tax credits (ITCs) for new carbon-free generation. These credits could make power uprates—increasing the maximum power level at which a commercial plant may operate—a much more appealing option for utilities.
Abdel-Razik Z. Hussein, J. A. Harvey, N. W. Hill, J. R. Patterson
Nuclear Science and Engineering | Volume 78 | Number 4 | August 1981 | Pages 370-376
Technical Paper | doi.org/10.13182/NSE81-A21370
Articles are hosted by Taylor and Francis Online.
Time-of-flight measurements of the neutron total cross section of 231Pa were carried out, in the energy range 0.01 to 10 000 eV, on two sample thicknesses using the Oak Ridge Electron Linear Accelerator as the pulsed neutron source. The 231Pa sample material was in the form of Pa2O5 from which two samples were made for the transmission measurements with thicknesses of 3.35 × 10-4 and 7.91 × 10-4 atom/b, respectively. Measurements were made for both thicknesses using an 18-m flight path and a neutron energy resolution of ∼0.3%. Transmission data were also obtained on the thick sample using the 80-m flight path with an energy resolution of ∼0.08%. The 231Pa samples were cooled with liquid nitrogen to reduce the Doppler broadening of the resonances. The transmission data have been analyzed to obtain the resonance parameters for all observed resonances up to 120 eV. The multilevel R matrix code MULTI, which includes instrumental resolution and the Doppler broadening, has been used to fit the data. Resonance energies and neutron widths were determined for a total of 137 resonances. The radiation widths of 17 resonances below 12 eV were obtained based on a determination of the effective temperature of the sample from the analyses of resonances at higher energies where Doppler broadening is dominant. The average radiation width was determined to be 40 ± 2 meV. The average observed level spacing was computed to be 0.47 ± 0.05 eV for the resonances up to 23 eV. The s-wave strength function up to 70 eV is (0.90 ± 0.10) × 10-4. Good agreement was obtained with earlier fast chopper data of 231Pa resonance parameters in the 0.01- to 70-eV energy region. The neutron widths of the 231Pa resonances are needed to determine the fission widths of the resonances from fission cross-section data and to reevaluate the neutron-induced reactions on this isotope.