Neutron spectrometry method for partial radiative capture cross-section measurements

The reported neutron spectrometry method is based on primary gamma -transit ion energy shifts. It has been demonstrated in measurements of the partial radiative capture cross-section of the Ni-58(n,gamma)Ni-59 reaction at the example of gamma -transitions to the ground and second excited states of Ni -59. The reaction Li-7(p,n) is used to produce resonance neutrons by means of the proton beam of a Van de Graaff accelerator. A compact geometry allow s one to improve the luminosity and to employ a rather wide neutron spectru m of up to similar to 100 keV. Both partial radiative parameters of some ne utron resonances and partial cross sections for population of the low-lying states of the daughter nucleus Ni-59 are obtained. The results are compare d with the data obtained by the time-of-flight method. (C) 2001 Elsevier Sc ience B.V. All rights reserved.