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
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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!
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Nuclear Science and Engineering
September 2024
Nuclear Technology
August 2024
Fusion Science and Technology
Latest News
Taking shape: Fusion energy ecosystems built with public-private partnerships
It’s possible to describe fusion in simple terms: heat and squeeze small atoms to get abundant clean energy. But there’s nothing simple about getting fusion ready for the grid.
Private developers, national lab and university researchers, suppliers, and end users working toward that goal are developing a range of complex technologies to reach fusion temperatures and pressures, confounded by science and technology gaps linked to plasma behavior; materials, diagnostics, and electronics for extreme environments; fuel cycle sustainability; and economics.
L. J. Esch, M. L. Yeater, W. E. Moore, K. W. Seemann
Nuclear Science and Engineering | Volume 46 | Number 2 | November 1971 | Pages 223-235
Technical Paper | doi.org/10.13182/NSE71-A22356
Articles are hosted by Taylor and Francis Online.
The double differential neutron scattering cross section for water has been measured at temperatures of 27, 170, and 270°C, The RPI linear electron accelerator provided the pulsed neutron source for a time-of-flight analysis of neutron energy. By phasing the LINAC with a high speed chopper, incident neutron energies ranging from 0.04 to 0.632 eV were selected. Energy distributions of scattered neutrons were obtained at scattering angles of 10, 14, 25, 40, 60, 90, 120, and 150 deg. The relatively wide range of incident energies with good resolution made it possible to observe clearly the molecular energy levels. The structure was seen to broaden considerably in going from 27 to 170°C but was little changed by the further temperature increase. A model has been developed in which the water scattering system is considered as consisting of aggregates of molecules. These clusters have temperature-dependent sizes, and diffuse according to a temperature-dependent diffusion constant. The energy levels of the molecules bound in the cluster are represented by a multi-Gaussian frequency distribution which varies with temperature. The internal vibrations of the individual water molecules are represented by delta functions. A new approach has been taken in comparing this and other models with the data, involving the application of recent improvements in methods of treating resolution and multiple scattering: a Monte Carlo technique has been used to impose these conditions on the models. These comparisons, and comparisons with integral data, indicate that the new model should have advantages for reactor calculations.