Abstract
The energy distribution of “14 MeV neutrons” at the axial sample irradiation position of a sealed neutron tube with cylindrical acceleration structure used at the GKSS facility KORONA has been calculated. The underlying physical principles and the mathematical formulation are, in some detail, described in the paper. The average energy of the direct neutron spectrum is found to be 14.69 MeV with a fwhm of 0.55 MeV. A small decrease of peak energy to 14.60 MeV is observed when elastic scattering by structure materials is included, and the spectrum suffers some softening mainly due to neutron interaction with light elements such as hydrogen. The contribution of scattered neutrons is about 29%. The influence of the neutron spectrum on the average activation cross-section is discussed for some typical cases.
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