  Research on accelerator driven systems (ADS), related new fuels and their
ability for nuclear waste incineration has led to a revival of interest in
nuclear cross sections of many nuclides over a large energy range.
Discrepancies observed between nuclear data bases require new measurements in
several cases. A complete measurement of such cross sections including
resonance resolution consists of an extensive beam time experiment associated
to a long process of analysis ans validation. With a slowing down spectrometer
associated to a pulsed neutron source, it is possible to determine good cross
section profile in an energy range from 0.1 eV to 40 keV. These measurements
performed at ISN (Grenoble) with neutron source GENEPI requires only small
quantities of matter (as small as 0.1 g) and about one day of beam per target.
