Figure 5 | Scientific Reports

Figure 5

From: Non-invasive detection of hazardous materials with a thermal-to-epithermal neutron station: a feasibility study towards practical application

Figure 5

Powder sample of melamine of mass M = 2.298 g. The results of the selection process of the best-fitting model for the proton NMD data. The selection process has been performed based on the Fitting Algorithm for Bayesian Analysis of DAta (FABADA)63. Probability distribution functions for the \(\chi ^2\) variable (left panel) and NMD widths (right panel) were calculated using the FABADA software for the Gaussian and multivariate Gaussian NMD models. The left panel shows the probability distribution functions for the absolute (not divided by the number of degrees of freedom) \(\chi ^2\) values in the case of the multivariate Gaussian model (3D) and the isotropic Gaussian model (1D). The top right panel shows the probability distribution function of the width of the proton NMD, \(\sigma \), as calculated for the isotropic Gaussian model. The bottom right panel shows the probability distribution functions of the widths, \(\sigma _x\), \(\sigma _y\), and \(\sigma _z\), as calculated for the multivariate Gaussian NMD model.

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