Determination of neutron spectra formed by 40-MeV deuteron bombardment of a lithium target with multi-foil activation technique

Neutron Aux spectra at an irradiation field produced by a 40-MeV deuteron b ombardment on a thick lithium-target at Forschungszentrum Karlsruhe, German y, have been determined by the multi-foil activation technique. Twenty-seve n dosimetry reactions having a wide energy range of threshold energies up t o 38 MeV were employed as detectors for the neutron flux spectra extending to 55 MeV. The spectra were adjusted with the SAND-II code with the experim ental reaction rates based on an iterative method. The adjusted spectra val idated quantitatively the Monte Carlo deuteron-lithium (d-Li) neutron sourc e model code (M(C)DeLi) which was used to calculate initial guess spectra a nd also has been used for IFMIF nuclear designs. Accuracy of the adjusted s pectra was similar to 10% that was suitable for successive integral tests o f activation cross section data. (C) 2000 Elsevier Science B.V. All rights reserved.