Beta-delayed gamma rays are an important diagnostic for nuclear forensic analyses. The FIER (Fission Induced Electromagnetic Response) code is a tool to model time-dependent delayed gamma-ray spectra from neutron-induced fission. Using systematically perturbed input parameters (i.e., neutron irradiation scheme, interrogation spectrum, isotopic composition of the sample, etc.), the FIER code is used to generate a database of delayed gamma-ray spectra. Model outputs are stored for comparison with measured data, and those input parameters that mostly closely reproduce the experimental data are identified. Through this, FIER can be applied to inverse problems for nuclear forensics applications using the Berkeley Nuclear Data Cloud (BNDC) framework at the Applied Nuclear Physics Program at Lawrence Berkeley National Lab (LBNL). This work further showcases the sensitivity of delayed gamma-ray experiments to nuclear data uncertainties and illuminates data deficiencies.

FIER: A method for forensic attribution of fissile mixtures using beta-delayed gamma-ray signatures

249th National Meeting (2015)

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