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arXiv 1807.02596nucl-exphysics.ins-det
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Geant4的G4NRF模块根据$^{238}$ U和$^{27}$ Al的核共振荧光数据的验证

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

Jayson R Vavrek, Brian S Henderson, Areg Danagoulian

摘要:

G4 NRF是一个模拟模块,用于在Geant 4框架中模拟核共振荧光(NRF)相互作用。在这项工作中,我们验证G4 NRF对绝对和相对测量的三个NRF相互作用在2.2兆电子伏附近的$^{238}$ U和$^{27}$铝使用的传输NRF数据在arXiv:1712.02904中描述的实验。在数据中观察到的绝对NRF计数率与通过广泛的Geant 4 + G4 NRF建模预测的绝对NRF计数率之间的一致性验证了组合的Geant 4 + G4 NRF在$^{238}$ U NRF转变中的$15$- $20\%$和在$^{27}$ Al中的$8\%$内,对于整个研究的平均$13\%$差异。在相对NRF率的模拟和实验之间的差异,表示为计数率在各种NRF线的比率,被发现在${\lesssim}4\%$的水平,并在统计学上等同于零。反演分析,还得到了$^{238}$ U和$^{27}$ Al的绝对能级宽度和分支比的近似值。

英文摘要:

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.

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