keV neutron resonance capture in barium-135

Abstract

The neutron capture cross section of 135Ba has been measured with high resolution at the Oak Ridge Linear Accelerator in the energy range 3 to 100 keV. From over ninety observed resonances in the 3 to 6 keV energy range, the average resonance parameters obtained were: <гγ> = 150 ± 20 meV; <D> = 39.3 ± 4 eV and l0 4S = 0.8 ± 0.2. The quoted radiation width and p-wave strength function also have a normalisation error of ± 20 per cent. The method of separation of в- and p-wave populations by statistical methods is described.