Measurements of the {sup 235}U(n,f) cross section in the 3 to 30 MeV neutron energy region

Conference · Tue Dec 31 04:00:00 EST 1991

OSTI ID:508736

Carlson, A D; Wasson, O A ^[1]; Lisowski, P W ^[2]

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1. National Institute of Standards and Technology, Gaithersburg, MD (United States)
2. 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
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CROSS SECTIONS
FISSION
MEV RANGE 01-10
MEV RANGE 10-100
NEUTRON REACTIONS
URANIUM 235 TARGET