Measurements and calculations of neutron leakage spectra from slabs irradiated with Be-9(d,n)(BH)-B-10-H-2(d,n)He-3 and Pu-Be neutrons

The spectra of neutrons from the Be-9(d, n)B-10, H-2(d, n)He-3 and Pu-Be so urces passing through slabs of water, graphite, Al, Fe and Pb up to 20 cm i n thickness were measured by a pulse height response spectrometer in the 1. 5-15 MeV range. The measured leakage spectra have been compared with calcul ated results obtained using the three dimensional Monte-Carlo code MCNP-4A and point-wise cross sections from the ENDF/B-IV, ENDF/B-VI and JENDL-3.1 d ata files. A comparison of the measured and calculated data has shown that the MCNP-4A code with an appropriate library can reasonably approximate the measured leakage spectra. (C) 1999 Elsevier Science Ltd. All rights reserv ed.