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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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Powering the future: How the DOE is fueling nuclear fuel cycle research and development
As global interest in nuclear energy surges, the United States must remain at the forefront of research and development to ensure national energy security, advance nuclear technologies, and promote international cooperation on safety and nonproliferation. A crucial step in achieving this is analyzing how funding and resources are allocated to better understand how to direct future research and development. The Department of Energy has spearheaded this effort by funding hundreds of research projects across the country through the Nuclear Energy University Program (NEUP). This initiative has empowered dozens of universities to collaborate toward a nuclear-friendly future.
R. Böttger, H. Klein, A. Chalupka, B. Strohmaier
Nuclear Science and Engineering | Volume 106 | Number 3 | November 1990 | Pages 377-398
Technical Paper | doi.org/10.13182/NSE90-A29065
Articles are hosted by Taylor and Francis Online.
A precision multidetector neutron time-of-flight (TOF) spectrometer and low-mass paral-lel-plate ionization chambers with a 252Cf deposit on the inner electrode are used to measure the spectral fluence of neutrons from the spontaneous fission of 252Cf in the 2- to 14-MeV energy range. Various methodological problems are carefully investigated. The influence of anisotropic efficiency in detecting the fission fragments is determined experimentally and numerically. Formulas are derived for an iterative analysis of the measured TOF spectra taking into account an inverted time scale and a nonextended dead time in the stop chain. On the basis of calculated neutron detection efficiencies, which were recently confirmed by n-p scattering experiments and proton recoil telescope measurements, it was possible to extract the spectral fluence of fission neutrons in absolute scale. The experimental data show significant deviations from a Maxwellian distribution with an energy parameter E0 = 1.42 MeV, but reasonable agreement can be achieved with cascade evaporation model calculations.
