Measurement of the angle-integrated secondary neutron spectra from interaction of 14 MeV neutrons with medium and heavy nuclei

The angle-integrated secondary neutron spectra from interactions of 14.1-MeV neutrons with 17 elements in the range Ti to Bi were measured over the secondary neutron energy range 0.25 to 6 MeV with special emphasis on obtaining reliable and accurate neutron production cross-sections in the low energy region (0.25 to 1 MeV). An overall accuracy of 5 to 7% was obtained over most of the investigated energy ranges. The results are in good agreement with the predictions of statistical model calculations and, in the neutron energy range above 1.5 MeV, also with most other recent measurements; in the low energy range there are still large discrepancies between the results of different measurements. 14 figures, 1 table