The attenuation of 14.8 MeV neutrons has been determined using the63Cu/n,2 n/62Cu threshold reaction for the detection of the primary neutrons. The attenuation of primary flux in different materials can be well described by a simple exponential relation based on the removal cross section. The microscopic removal cross sections determined for graphite, aluminium, steel and lead are as follows 0.73±0.04, 1.04±0.04, 1.41±0.02 and 2.63±0.12 barn, respectively. The dependence of secondary neutron spectrum on the thickness of slabs has also been investigated by threshold detectors. Nuclear temperatures were estimated from the secondary neutron spectra.
ASJC Scopus subject areas
- Physics and Astronomy(all)