Measurement of Neutron Spectra of the Experimental Breeder Reactor

The neutron spectra at two positions in the core and two positions in the inner blanket of the Experimental Breeder Reactor in Idaho have been measured by means of beams extracted from these positions. The energy range covered was from 75 kev to 4 Mev. A cloud chamber was used for the measurement from 75 kev to 1 Mev and recoil-proton tracks in nuclear plates for that from 0.8 to 4 Mev. Reaction rate ratios measured inside the reactor agree well with those calculated from known cross sections and the spectra found in the beams.