Measurements of the {sup 235}U(n,f) cross section in the 3 to 30 MeV neutron energy region
- National Institute of Standards and Technology, Gaithersburg, MD (United States)
- Los Alamos National Lab., NM (United States); and others
To improve the accuracy of the {sup 235}U(n,f) cross section, measurements have been made of this standard cross section at the target 4 facility at Los Alamos National Laboratory (LANL). The data were obtained at the 20-meter flight path of that facility. The fission reaction rate was determined with a fast parallel plate ionization chamber and the neutron fluence was measured with an annular proton recoil telescope. The measurements provide the shape of the {sup 235}U(n,f) cross section relative to the hydrogen scattering cross section for neutron energies from about 3 to 30 MeV neutron energy. The data have been normalized to the very accurately known value near 14 MeV. The results are in good agreement with the ENDF/B-VI evaluation up to about 15 MeV neutron energy. Above this energy differences as large as 5% are observed.
- Research Organization:
- National Inst. of Standards and Technology, Gaithersburg, MD (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AI05-91ER40610
- OSTI ID:
- 508736
- Report Number(s):
- DOE/ER/40610-T4; CONF-910503-33; ON: DE97007329; TRN: 97:004690
- Resource Relation:
- Conference: International conference on nuclear data for science and technology, Juelich (Germany), 13-17 May 1991; Other Information: PBD: 1991
- Country of Publication:
- United States
- Language:
- English
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