Self-Absorption of Neutron Capture gamma-Rays in Gold Samples

摘要

The self absorption of neutron capture gamma rays in gold samples has been determined experimentally for two standard setups used in measurements of neutron capture cross sections. One makes use of an artificially collimated neutron beam and two C sub 6 D sub 6 detectors, the other of kinematically collimated neutrons and three Moxon-Rae detectors. Correction factors for an actual measurement of a neutron capture cross section, using a gold standard of 1 mm thickness, were found up to 12% for the first setup while they are only 4% for the second setup. The present data allow determination of the correction in an actual measurement with an accuracy of 0.5-1%. (ERA citation 09:017725)