Abstract
The characteristics of a Lead Slowing‐Down Spectrometer (LSDS) installed at the Los Alamos Neutron Science Center (LANSCE) are presented in this paper. This instrument is designed to study neutron‐induced fission on ultra small quantities of actinides, on the order of tens of nanograms or less. The measurements of the energy‐time relation, energy resolution and neutron flux are compared to simulations performed with MCNPX. Results on neutron‐induced fission of 235U and 239Pu with tens of micrograms and tens of nanograms, respectively, are presented. Finally, a digital filter designed to improve the detection of fission events at short time after the proton pulses is described.
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