ARC-DPA 1-MeV Neutron Fluence Equivalence Model for GaAs

N Asper and J Jones, IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 72, 1335-1342 (2025).

DOI: 10.1109/TNS.2025.3531319

The legacy data used in the production of the American Society for Testing and Materials (ASTM) E722 standard for gallium arsenide (GaAs) were fit with the athermal recombination corrected-displacements per atom (ARC-DPA) model for the development of a novel 1-MeV neutron equivalent fluence metric. Improving on previous work, the coefficients for the ARC-DPA model were optimized using a conjugate gradient method, and the uncertainties in the observed damage in different benchmark neutron fields were sampled to quantify their contribution to the damage metric. The optimized parameters of -0.474 +/- 0.03 for b(arcdpa) and 0.016 +/- 0.002 for c(arcdpa) provided good agreement and indicated that the solution is not sensitive to the corresponding fluence uncertainties. Compared to the current 1-MeV neutron fluence equivalence standard for displacement damage in GaAs, our results indicate that for a thermal reactor neutron environment, displacement damage has been underestimated by around 25% and that the saturation value for the damage efficiency had been higher than previously modeled.

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