MEASUREMENT OF DOUBLE DIFFERENTIAL NEUTRON EMISSION CROSS SECTIONS OF U-238 INDUCED BY 14.2 MeV NEUTRONS
Institute of Atomic Energy, P.O. Box 275, Beijing, China
Double differential neutron emission cross sections of uranium-238 at 14.2 MEV have been measured by means of associated particle time of flight technique. The neutron flight path is 3.055m. The neutron detector consists of an st-451 liquid scintillator (φ105×50mm) and an XP-2040 photomultiplier tube. The time resolution of the TOF spectrometer is about 1.2 ns. The double differential cross sections in the effective energy range 2 to 12 MEV are obtained at 13 angles between 5 to 155 degrees with an overall error of 5 to 15%. The data are corrected for neutron flux attenuation, multiple scattering and finite geometry with a Monte-Carlo code. The experimental results are compared with theoretical calculations and good agreement is achieved.
KEYWORDS: Uranium-238, 14.2 MEV neutron, double differential cross section