Abstract
The factors affecting prediction of LET spectra are discussed, namely the reaction cross sections and modelling of emitted charged particle spectra. The alpha particle spectrum from the 14N(n,2α) and 12C(n,3α) reactions is calculated assuming sequential break-up and either isotropic or anisotropic particle emission in the centre of mass, and examples are given for 20 MeV neutrons. The cross sections used in the LET predictive code NESLES are examined and updated, and the net effect on a 14 MeV neutron event size distribution is calculated. The different components of a 14 MeV event size distribution are identified. Finally, predicted and measured event size distributions for 14.2 MeV neutrons are compared.
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