Validation of Geant4's G4NRF module against nuclear resonance fluorescence data from ${}^{238}$U and ${}^{27}$Al

Abstract

G4NRF is a simulation module for modeling nuclear resonance fluorescence (NRF) interactions in the Geant4 framework. In this work, we validate G4NRF against both absolute and relative measurements of three NRF interactions near 2.2 MeV in ${}^{238}$U and ${}^{27}$Al using the transmission NRF data from the experiments described in arXiv:1712.02904. Agreement between the absolute NRF count rates observed in the data and predicted by extensive Geant4+G4NRF modeling validate the combined Geant4+G4NRF to within $15$--$20\%$ in the ${}^{238}$U NRF transitions and $8\%$ in ${}^{27}$Al, for an average $13\%$ discrepancy across the entire study. The difference between simulation and experiment in relative NRF rates, as expressed as ratios of count rates in various NRF lines, is found at the level of $\lesssim 4\%$, and is statistically identical to zero. Inverting the analysis, approximate values of the absolute level widths and branching ratios for ${}^{238}$U and ${}^{27}$Al are also obtained.

arXiv comment12 pages, 4 figures, 4 tables; revisions after peer review comments, chiefly making the paper more concise and the reporting of results more clear

References in corpus (4)

• Magnetic dipole excitations in nuclei: elementary modes of nucleonic motion
• Experimental demonstration of an isotope-sensitive warhead verification technique using nuclear resonance fluorescence
• Experimental status of the nuclear spin scissors mode
• High-accuracy Geant4 simulation and semi-analytical modeling of nuclear resonance fluorescence

Cited by in corpus (2)

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• High-accuracy Geant4 simulation and semi-analytical modeling of nuclear resonance fluorescence