Measurement of double-differential neutron emission cross sections of sodium and lead

Using the time-of-flight (TOF) facility at the Institut fuer Radiumforschung und Kernphysik (IRK) energy- and angle-differential neutron emission cross sections (DDX) were measured for sodium and natural lead at 14 MeV incident-neutron energy. Secondary-neutron spectra were measured at scattering angles from 30{degrees} to 150{degrees} in steps of 15{degrees}, with the secondary-neutron energy in the range from 2 to 14 MeV. The raw experimental data were converted to double-differential cross sections for properly chosen energy bins. The reduction to DDX included corrections for absorption and multiple scattering within the sample. After fitting Legendre polynomials to the DDX data for each chosen energy bin, angle-integrated energy-differential cross sections were obtained. The results of the lead measurements were used to verify the proper operation of our experimental facility and to check the methods used for sorting and reducing the raw data. A comparison with already measured and/or evaluated data was performed. The cross sections of sodium were compared with results from model calculations carried out at the IRK and data measured by other laboratories.